Texas Instruments' solutions for sweeping robot systems

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Texas Instruments' solutions for sweeping robot systems [Copy link]

 

Author: Wu Yang and Zeng Fanchen, field application engineers in South China, TI

Abstract

In recent years, the sweeping robot market has risen rapidly, and more and more users and manufacturers are paying attention to this field. TI provides a wide range of analog and embedded solutions for this application to help you quickly select and design. The sweeping robot system can be divided into the following subsystems: Battery management, power management, motor drive, sensor and signal conditioning, human-computer interaction interface and other parts.

The block diagram of the vacuum robot system can be viewed on the TI official website: 查看详情

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In this series of sharing, the main subsystems in the figure will be introduced in turn:

Section 1, Battery Management

Section 2, Power Management

Section 3, Motor Drive

Section 4: Sensors and Signal Conditioning

Section 5: Human-Computer Interaction Interface

Section 1: Battery Management

The typical application of a sweeping robot is to use four lithium batteries in series. Battery management is divided into two parts: battery protection and charging management. As shown in the figure below, the battery protection part is generally designed in the battery pack to diagnose and protect the battery from abnormal conditions under various working conditions. Charging management will be on the mainboard of the sweeping robot or on the charging dock, responsible for managing the charging curve of the lithium battery to achieve efficient and safe charging.

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The following introduces TI's solutions for battery charging management, battery protection and fuel gauge:

1.1 Charging Management

In order to ensure battery safety and life, the charging process of lithium batteries is divided into four stages: trickle charging (low-voltage pre-charging), constant current charging, constant voltage charging and charging termination. At the same time, there will be requirements for battery voltage detection, input current limiting, shutting down the charger after charging is completed, and automatically starting charging after partial discharge of the battery. This means that the charging of lithium batteries requires the use of dedicated battery charging chips to better ensure battery safety and life. The charging chip provided by TI [url=http://www.ti.com.BQ24773[/url] optimizes the design and performance of charge management from all aspects:

BQ24773Key parameter description: 4.5V to 24V wide input voltage range, supports 1-4 batteries Programmable input current limit, charge voltage, charge current and minimum system voltage regulation Under 20mA load condition, 600μA Ultra-low quiescent current and >80% high pulse frequency modulation (PFM) light load efficiency, in line with Energy Star and ERP Lot6 standards. +/-0.5 voltage detection accuracy, +/-2% input and output current sampling Support 600KHz-1.2MHz switching frequency (programmable setting)

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The above is [color=rgb(170, 102, For more details, please refer to the BQ24773 data sheet. The dedicated charging IC provided by TI can provide the system with precise charging control and complete protection mechanism. It is of great significance to improve product quality and optimize system cost. The use of dedicated charging IC can not only bring more comprehensive and accurate charging to the system, but also improve the service life of the battery and reduce the overall cost. For more details, please refer to the following blog:

The value of a charger IC over a discrete solution for vacuum robots[/size ]

This is a basic introduction to the BQ24773 principle. For more details, please refer to the BQ24773 data sheet. The dedicated charging IC provided by TI can provide the system with precise charging control and complete protection mechanism. It is of great significance to improve product quality and optimize system cost. The use of dedicated charging IC can not only bring more comprehensive and accurate charging to the system, but also improve the service life of the battery and reduce the overall cost. For more details, please refer to the following blog:

The value of a charger IC over a discrete solution for vacuum robots[/size ]

This is a basic introduction to the BQ24773 principle. For more details, please refer to the BQ24773 data sheet. The dedicated charging IC provided by TI can provide the system with precise charging control and complete protection mechanism. It is of great significance to improve product quality and optimize system cost. The use of dedicated charging IC can not only bring more comprehensive and accurate charging to the system, but also improve the service life of the battery and reduce the overall cost. For more details, please refer to the following blog:

The value of a charger IC over a discrete solution for vacuum robots[/size ]

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1.2 Battery protection and fuel gauge

The implementation of this function depends on a dedicated lithium battery protection IC. According to the different needs of users, TI can provide four different types of protection solutions:

Protection IC Type	Model	Integrated Function
Secondary Protection Chip	BQ7718	Overvoltage Detection
First-level Protection Chip	BQ77905	[p=21, null, BQ76920[/url]	Measurement of voltage, current and temperature, as well as overvoltage/undervoltage protection and discharge overcurrent/short circuit protection
Analog front end	BQ76920	Measurement of voltage, current and temperature, as well as overvoltage/undervoltage protection and discharge overcurrent/short circuit protection
Electricity gauge	BQ4050	Power calculation, and comprehensive protection of voltage, current and temperature

The following is an introduction to the key solutions:

1) BQ4050

TI's fuel gauge technology can accurately measure battery capacity, obtain data reflecting battery health and safety diagnosis, and can also realize overvoltage, overcurrent, temperature protection and voltage balancing. The above battery information can also be sent to the host through SMBUS and connected to the user terminal through WIFI, so that users can timely understand the battery health of the sweeping robot.

The BQ4050 device from Texas Instruments (TI) features compensated end-of-discharge voltage (CEDV) technology and is a highly integrated, high-accuracy 1- to 4-cell battery fuel gauge and protection solution that enables autonomous charger control and cell balancing.

[color=rgb(170, 102, BQ4050[/url]Key parameter description: Dual independent ADC, not only can synchronize current and voltage sampling, but also can realize high-precision coulomb counter function so that the input offset error is < 1μV (typical value) Support a wide range of programmable battery and system protection, such as overvoltage protection, overcurrent protection and overtemperature protection Internal bypass cell balancing function (passive balancing) Use the compensation discharge end voltage (CEDV) algorithm to measure and calculate the available capacity in the battery cell with an accuracy of less than 5%

查看详情 and BQ4050 Technical Reference Manual.

2) BQ77905

During the use of lithium batteries, once overvoltage or overcurrent (short circuit) problems occur, it will not only affect the life of the battery, but also bring safety problems. This means that all devices using lithium batteries must be equipped with a battery protector to ensure that the lithium battery can work normally in a relatively safe environment.

TI providesBQ77905 is a 3-5 ultra-low power voltage, current, temperature and open circuit stackable lithium-ion battery protector that can achieve a series of voltage, current and temperature protection without the need for microcontroller (MCU) control. This device just meets the needs of 4S lithium batteries in sweeping robot products. A single chip can achieve overvoltage, overcurrent, short circuit, temperature and other protections.

BQ77905Key parameter description: Voltage (over/under), current (over discharge/short circuit) and temperature protection (over/under), ultra-high precision measurement (voltage ±10mV) Protection thresholds and delays are factory programmed, and a variety of configurations are available Integrated independent CHG and DSG low-side NMOSFET Drivers for battery pack protection that can be disabled via two control pins Ultra-low power consumption: 6μA

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[color=rgb(170, 102, The BQ77905 can also be stacked to accommodate more nodes. For more details, please refer to the BQ77905 data sheet and more BQ77905 application notes.

Section 2 Power Management

The typical power rail of power management in a sweeping robot is shown in the blue box below: The system takes power from 4 lithium batteries, converts it to 5V through the first-level step-down, and supplies power to external modules, some sensors and related logic circuits. 5V will also be converted to 3.3V, 1.8V, etc. required by the subsequent system through the second-level step-down circuit. The first-level step-down circuit usually consumes a lot of power and will choose a DCDC converter. The second-level step-down circuit usually consumes less power and can choose LDO or DCDC according to the actual situation of the user. A typical sweeping robot power tree is shown in the figure below.

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2.1 Buck TypeDCDC

Generally speaking, in order to extend the operating time of battery-powered devices, the system will have requirements for efficiency, static power consumption and other indicators. At the same time, cost is also very important. Considerations: TI's power management products provide a good balance between performance and cost. The following are some of TI's most popular materials in sweeping robot products, with a voltage range of 24V-40V, suitable for the first-stage step-down circuit: ]

[ tr][td=96]

LMR14020

[p= 21, null, left]Model	Input range (V)	Output range (V)	Output current(A)	Features	Package[ /p]
TPS56239H	[p=21 , null, left]4.5-24	0.8-16	[p=21 , null, left]2.0	Pin2Pin compatible Built-in compensation network Simplified peripheral circuit Synchronous rectification	SOT23-6[/p ]
TPS54202	4.5-28 [/td ][td=90] 0.8-25	2.0	SOT23-6
[p =21, null, left]TPS54302[ /p]	4.5-28	0.8-25[ /p]	3.0		SOT23-6
TPS54308	4.5- 28	0.8-25	3.0[ /p]		SOT23-6
[p=21, null , left]TPS54231/331	3.5-4.5	0.8-25	2/3A	Asynchronous rectification	SOT23-6
TPS54335A [/ td][td=86] 4.5-28	0.8-25 [/ td][td=88] 3.0	The frequency is adjustable, up to 1.5MHz	SOP-8
[p=21 , null, left]LMR14006[/p ]	4.5-40	1-36[/p ]	0.6	Fixed frequency, 2.1MHz or 1.1Mhz optional	SOT23-6
4.5-40	[p=21 , null, left]1-36	2.0	Pin2Pin compatible High efficiency, good dynamic response	SOP-8 [/td][/tr ]
LMR14030	4.5-40	[p =21, null, left]1-36		3.0	[p=21 , null, left]SOP-8
LMR14050	4.5- 40	1-36		5[ /p]	SOP-8
[p=21, null , left]TPS560430	[p =21, null, left]4.0-36	1-35	[p =21, null, left]0.6	Fixed frequency, 2.1MHz or 1.1Mhz optional [/td][td =72] SOT23-6

null, left]5

[/td][td=72]

SOP-8

[/td][/tr] [tr][td=96]

TPS560430[/color ]

[/td][td=86]

4.0-36

[/td][td=90]

1- 35

[/td][td=88]

0.6

[/td][td=204]

Fixed frequency, 2.1MHz or 1.1Mhz optional

[/td][td=72]

SOT23-6

[/td][/tr] [ /table]

null, left]5

[/td][td=72]

SOP-8

[/td][/tr] [tr][td=96]

TPS560430[/color ]

[/td][td=86]

4.0-36

[/td][td=90]

1- 35

[/td][td=88]

0.6

[/td][td=204]

Fixed frequency, 2.1MHz or 1.1Mhz optional

[/td][td=72]

SOT23-6

[/td][/tr] [ /table]

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We take TPS54202 as an example:

The chip supports a maximum input voltage of 28V continuous, which is suitable for applications with 4 lithium batteries in series. Its synchronous rectification structure can ensure an efficiency of up to 98% at full load. At the same time, due to the light load frequency hopping mode, high efficiency can be guaranteed under light load conditions. For example, the efficiency can reach more than 90% under 10mA output current.

TPS54202Key parameter description: Synchronous rectification, built-in 150mΩ/80mΩ MOSFETs, support 2A continuous conduction current. Light load frequency modulation mode, ultra-high light load efficiency Spread spectrum technology optimizes EMC Fixed soft start: 5ms Peak current control mode, built-in compensation network Fixed 500KHz frequency, Fixed 500kHz SOT23-6 Package

查看详情

2.2 Linear voltage regulationLDO

Compared to the step-down DCDC converter, the linear voltage regulation has smaller output ripple and less noise, which is beneficial to the stable operation of the processor, MCU and some sensors in the sweeping robot system, and is suitable for the first-stage step-down circuit. Therefore, when the input and output voltage difference is not large, LDO is the preferred power management solution. TI provides the most extensive LDO products in the industry. Under different input and output voltages, currents, packages, voltage differences, quiescent currents, power consumption, and noise indicators, TI can provide cost-effective solutions.

We take TLV758P as an example to illustrate:

TLV758PKey parameter description: Input voltage range: 1.5V – 6.0V Output Voltage Range: 0.55V – 5.5V (Adjustable) Output Voltage Accuracy: 1% (max) @ 85C Dropout Voltage: 125mV (max) at 500mA (3.3Vout) Quiescent Current: 25uA (typ) Common Mode Rejection Ratio PSRR: 50dB @ 100kHz Input Surge Current Limitation Over Current Protection Output Capacitor Active Discharge Package: 2x2 DFN-6

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For more solution selection, please query in the following ways: TI official website LDO selection website LDO Quick Query Guide

Section 3 Motor Drive

Typical sweeping robot products have many occasions that require motor drive, such as: left and right wheels, main brush, side brush, water pump, vacuum motor, LDS swivel seat, etc. TI has a very comprehensive product catalog to choose from for different motor types and load sizes.

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Take the main wheel drive application as an example:

The main wheel motor is usually a 12V DC brushed motor. It undertakes functions such as forward rotation, backward rotation, mileage recording, and stall detection. TI's DRV8870 brushed motor drive product, combined with TI's ultra-high cost-effective op ampTLV9061, can perfectly realize all the above functions. TI also provides a reference design to realize this functionTIDA-01588, through the registration official websitemyTI, you can browse and download the design documents, schematics, test documents and other source files of this reference design for free. The basic architecture of the reference design is shown below: 102)]查看详情

As shown in the figure, the system power supply is 10.8V DC, connected across a TVS protection, and driven by the brushed motor BDC through the DRV8870. 10.8V DC passes through the LDO linear regulator TPS709 to the microcontroller TPS709. 102)]MSP430FR2433 supplies power, and the microcontroller sends instructions to DRV8870 to control the motor, thus realizing the forward rotation, reverse rotation, braking, neutral gear sliding and other functions of the main wheel of the sweeping robot. At the same time, DRV8870 combines the operational amplifier [url=http://www.ti.com.The TLV9061 performs current detection to realize stall detection and other functions. The photoelectric counter or Hall sensor signal on the motor is fed back to the microcontroller through the ESD interface chip ESD122, which can realize functions such as motor test history recording.

DRV8870Parameter Description: 6.5V – 45V input voltage range, 3.6A peak current output capability Built-in H-bridge NMOS PWM control signal input HSOP 8-pin package Supports the following protection mechanisms: 1) Input undervoltage lockout 2) Charge Pump undervoltage protection, overcurrent protection and overtemperature protection 3) Fault automatic restart

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For more details, please refer to [color=rgb(170, 102, DRV8870 Data Sheet.

In addition to the DRV8870 recommended in this reference design, TI also has the following distinctive solutions worth recommending: DRV8876. The following is an introduction to the product: [color=rgb(170, 102, The DRV8876 is a highly integrated H-bridge driver with built-in N-MOSFET, charge pump, current sampling conversion, and various protection circuits. It is very suitable for the main wheel drive or main brush drive of a sweeping robot. The biggest highlight of the DRV8876 is its ultra-high integration. It can realize stall detection through built-in sampling circuit and signal conditioning. Compared with traditional drive solutions (such as In addition, the DRV8876 can maintain ultra-low standby power consumption (<1uA) by setting the sleep mode to ensure that the battery of the sweeping robot can be saved to the maximum extent. :

DRV8876Parameter Description: 4.5V – 37V input voltage range, 3.5A peak current output capability Built-in current sampling circuit, no external power resistor required Current signal feedback output function, no external op amp required Spread spectrum technology optimizes EMI performance Supports 1.8V, 3.3V, 5V level control signal Supports class protection mechanism: 1) Input undervoltage lockout 2) Charge pump undervoltage protection 3) Overcurrent protection

查看详情[/ align]

For more details, please refer to DRV8846 Data Sheet. More TI motor drive products can be found on the official website: 170, 102, 102)]http://www.ti.com/motor-drivers/overview.html[ /color]

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Section 4 Sensors and Signal Conditioning

As a smart small household appliance, the sweeping robot has sensors as one of its core components. Typical functions that require sensors include: obstacle avoidance sensing, wall sensing, cliff detection, virtual wall detection, collision sensing, mileage detection, automatic recharge detection, visual sensing and navigation. In addition, different products will have different sensor requirements according to different functions, such as dust box/water tank detection, wheel abnormality detection, etc.

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TI provides the following types of sensors to achieve the above functions:

4.1 Hall Sensor

Hall sensor can be used to implement wheel odometer, virtual wall detection, such as dust box/water tank detection, wheel abnormality detection and other functions. TI's Hall sensors have the following features: 1) Wide input voltage range (1.65V-38V) ensures versatility and reliability; 2) Ultra-low standby power consumption (<1uA) helps extend the use time of battery devices; 3) Multiple bandwidth options (5Hz, 20Hz, 160Hz, 2KHz, 30KHz)

4） Multiple packages available (SOT-23, TO-92, X2SON)

4.2 1D TOF

1D ToF can be used for obstacle avoidance sensing, cliff detection, visual sensing and navigation. The following is a brief introduction to TI 1D TOF devicesOPT3101's basic working principle and application in sweeping robots.

1) OPT3101's basic working principle and advantages

ToF (Time of Flight) full name time of flight sensor. The ToF core system is composed of a light transmitter (laser, LED, IR, etc.) and a light receiver (photodiode). The modulated signal of the transmitter is reflected by the object and partially returns to the receiver. By measuring the phase difference between the transmitted light signal and the received light signal, the depth (distance) information of the measured object can be obtained, thereby realizing functions such as long-distance proximity sensing and distance measurement. 102)]查看详情

2) TI's ToF sensor OPT3101 has the following features and advantages

• Long-range ranging, obstacle detection and avoidance, 16-bit distance output within an unambiguous range of 15 meters, and the distance range can be extended through anti-aliasing technology
• Flexible custom design of various photodiodes and emitters (wide wavelength range)
• Up to 4kHz sampling rate
• Excellent ambient light and sunlight rejection performance (outdoor and indoor), ranging that does not depend on object color and reflectivity
• Adaptive HDR saves power and improves dynamic range
• Supports 3 transmitter channels to meet multi-zone operation requirements
• Integrated lighting driver with up to 173mA Programmable current control capability

3) OPT3101Application in sweeping robots

• Utilizing the strong anti-interference performance and high precision of OPT3101. It is very suitable for realizing the main obstacle avoidance detection function in the sweeping robot. Compared with the traditional infrared method, it can realize the detection of accurate distance signals, with better consistency and better resistance to light interference.
• Using the OPT3101, which is not affected by the color of the object, more reliable cliff detection can be achieved:
• Using the characteristics of the OPT3101, a rotating ToF lidar sensor can be constructed to achieve 360-degree omnidirectional laser ranging in a two-dimensional plane and generate a plane point cloud map information of the space. With the SLAM algorithm, accurate map construction, positioning and navigation and other functions can be achieved. For more details about this function, please contact your local TI sales representative and technical support.

4.3 General-purpose operational amplifiers TLV900X series

In addition to the sensor itself, TI provides a signal conditioning solution for the sensor's post-stage. A typical requirement in sweeping robot applications is a general-purpose operational amplifier. Common applications include motor current sampling, battery charging sampling, battery pack temperature signal conditioning, infrared sensor signal conditioning, etc. The general-purpose operational amplifier products provided by TI can fully cover the above application scenarios. The following product introduction is the high-cost general-purpose operational amplifier TLV900X currently promoted by TI. The TLV900x is a low-power, rail-to-rail input-output, 1MHz, general-purpose operational amplifier for cost-sensitive systems. The TLV900x family includes single-channel (TLV9001), dual-channel (TLV9002), and quad-channel (TLV9002), and dual-channel (170, 102, 102). 102)]TLV9004) Low voltage (1.8V to 5.5V) operational amplifier. It has the following features:

1) Rail-to-rail input and output

2) Low input offset voltage: ±0.4mV

3) Unity-Gain Bandwidth: 1MHz4) Easier to Stable with Higher Capacitive Loads (100pF) Due to Resistive Open-Loop Output Impedance5) Low Broadband Noise: 27nV/√Hz @ 1kHz6) Low Input Bias Current: 5pA7) Low Quiescent Current: 60μA/Channel

8) Operates with Supply Voltages as Low as 1.8V

9) Internal Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) Filters

10) Extended Temperature Range: –40°C to +125°C

The above is a basic introduction to the general-purpose op amp TLV900X. For more details, please refer to TLV900X Data Sheet. In addition, for applications with higher bandwidth and slew rate requirements, we also have TLV906X (bandwidth 10MHz), TLV905X (slew rate 15V/us) and other series products to choose from.

Section 5, Human-computer interaction interface

Rich human-computer interaction functions can bring better user experience and product added value to sweeping robot products. TI provides many solutions in this field: LED display, capacitive touch, voice amplifier, wireless connection, etc. Next, we will introduce LED display and capacitive touch solutions as representatives. TI's LED products cover a variety of application scenarios, including: indicator backlight driver, LED digital tube display driver, and breathing/marquee. For sweeping robot products, LED lights are usually used for status indication. Users can choose different types of display modes according to different product requirements. The advantages of TI LED driver chips include: 1) Saving MCU I/O ports. 2) Constant current drive, efficient and reliable. 3) Special lighting effects can be achieved without a lot of software resources. : The following is a rough classification and recommendation of TI LED products in sweeping robot applications:

	LED indicator light		Broken code typeLED digital tube	Breathing light, ring light
Interface	SPI	I2C	SPI	SPI	I2C
Indicators	Multi-channel output constant current driver	40V withstand voltage, multi-channel output constant current driver	Multi-channel output constant current driver	High resolution brightness control
				Multi-channel number	Built-in driver engine
Recommendation	TLC5928X TLC5947 TLC595X	TLC6C598 TLC6C5912 [/td][ td=101] TLC5928X TLC595X	TLC5947 (24CH) TLC595X (48CH)	LP55231 LP5569 [p=21, null,center]LP50XX
Typical application scenarios	Backlight display 查看详情		Nigital tube display 查看详情	Breathing light, marquee, gradient light, ring/bar and other effects 查看详情

Take the LP50XX series as an example: The LP50XX series is TI's new generation of RGB three-color lamp drivers. It can control multiple channels of RGB three-color lamps while occupying very few MCU resources, and achieve precise constant current, brightness, color changes, and pattern combination effects. The lamp efficiency achieved by this product brings a unique human-computer interaction experience to the sweeping robot. The simplicity of its development is also conducive to the rapid launch of products.

LP50XX parameters: Support multiple channel selection: 36/30/24/18/12/9-Ch VCC range: 2.7V to 5.5V Constant current control, maximum 25.5mA per channel in the full voltage range, up to 35mA when VCC is greater than 3.3V; Ultra-low shutdown current 1uA (Max.), low standby power consumption 10uA (Typ.) Each channel integrates 12bit, 29KHz PWM generator Independent channel color configuration register Independent channel brightness control register 3 programmable RGB libraries for easy software writing Can support 4 device cascade Support up to 400KHz fast I2C mode

查看详情

For more detailed information, please see LP50XXdatasheet, for more LED selections, please visit TI's official website: LED Selection.

com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-00-65/2019_2D00_03_2D00_14_5F00_114703.png][/url]

[/td][td=101][ p=21, null, center]Nigital tube display

查看详情[/ color]

[/td][td=2,1,259]

Breathing light, marquee, gradient light, ring/bar and other effects

查看详情

[/td][/tr] [/table]

Take the LP50XX series as an example: The LP50XX series is TI's new generation of RGB three-color light drivers, which can be used in MCU With very few resources, it can realize the control of multiple channels of RGB three-color lights, and achieve precise constant current, brightness, color change, pattern combination and other effects. The light efficiency achieved by this product brings unique Human-computer interaction experience. The ease of development also helps products to be quickly put on the market.

LP50XX parameters: Supports multiple channel number selection: 36/30/24/18/ 12/9-Ch VCC range: 2.7V to 5.5V Constant current control, maximum 25.5mA per channel in full voltage range, up to 35mA when VCC is greater than 3.3V; Ultra-low shutdown Off current 1uA (Max.), low standby power consumption 10uA (Typ.) Each channel integrates 12bit, 29KHz PWM generator Independent channel color configuration register Independent channel brightness control register 3 programmable RGB libraries for easy software writing Can support 4 devices cascade Support up to 400KHz fast I2C mode

查看详情

For more details, please see [ color=rgb(170, 102, 102)]LP50XX datasheet, for more LED selections, please visit TI's official website: LED Selection. [ /color]

com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-00-65/2019_2D00_03_2D00_14_5F00_114703.png][/url]

[/td][td=101][ p=21, null, center]Nigital tube display

查看详情[/ color]

[/td][td=2,1,259]

Breathing light, marquee, gradient light, ring/bar and other effects

查看详情

[/td][/tr] [/table]

Take the LP50XX series as an example: The LP50XX series is TI's new generation of RGB three-color light drivers, which can be used in MCU With very few resources, it can realize the control of multiple channels of RGB three-color lights, and achieve precise constant current, brightness, color change, pattern combination and other effects. The light efficiency achieved by this product brings unique Human-computer interaction experience. The ease of development also helps products to be quickly put on the market.

LP50XX parameters: Supports multiple channel number selection: 36/30/24/18/ 12/9-Ch VCC range: 2.7V to 5.5V Constant current control, maximum 25.5mA per channel in full voltage range, up to 35mA when VCC is greater than 3.3V; Ultra-low shutdown Off current 1uA (Max.), low standby power consumption 10uA (Typ.) Each channel integrates 12bit, 29KHz PWM generator Independent channel color configuration register Independent channel brightness control register 3 programmable RGB libraries for easy software writing Can support 4 devices cascade Support up to 400KHz fast I2C mode

查看详情

For more details, please see [ color=rgb(170, 102, 102)]LP50XX datasheet, for more LED selections, please visit TI's official website: LED Selection. [ /color]

Breathing light, marquee, gradient light, ring/bar and other effects

查看详情

[/td][/tr] [ /table]

Take the LP50XX series as an example: The LP50XX series is TI's new generation of RGB three-color lamp drivers. It can control multiple channels of RGB three-color lamps while occupying very few MCU resources, and achieve precise constant current, brightness, color changes, and pattern combination effects. The lamp efficiency achieved by this product brings a unique human-computer interaction experience to the sweeping robot. The simplicity of its development is also conducive to the rapid launch of the product.

LP50XX parameters: Support multiple channel number selection: 36/30/24/18/12/9-Ch VCC range: 2.7V to 5.5V Constant current control, maximum 25.5mA per channel in the full voltage range, up to 35mA when VCC is greater than 3.3V; Ultra-low shutdown current 1uA (Max.), low standby power consumption 10uA (Typ.) Each channel integrates 12bit, 29KHz PWM generator Independent channel color configuration register Independent channel brightness control register 3 programmable RGB libraries for easy software writing Can support 4 devices cascade Support up to 400KHz fast I2C mode

查看详情

[size=14p x]For more detailed information, please view LP50XXdatasheet, for more LED selections, please visit TI's official website: LED Selection.

Breathing light, marquee, gradient light, ring/bar and other effects

查看详情

[/td][/tr] [ /table]

Take the LP50XX series as an example: The LP50XX series is TI's new generation of RGB three-color lamp drivers. It can control multiple channels of RGB three-color lamps while occupying very few MCU resources, and achieve precise constant current, brightness, color changes, and pattern combination effects. The lamp efficiency achieved by this product brings a unique human-computer interaction experience to the sweeping robot. The simplicity of its development is also conducive to the rapid listing of products.

LP50XX parameters: Support multiple channel number selection: 36/30/24/18/12/9-Ch VCC range: 2.7V to 5.5V Constant current control, maximum 25.5mA per channel in the full voltage range, up to 35mA when VCC is greater than 3.3V; Ultra-low shutdown current 1uA (Max.), low standby power consumption 10uA (Typ.) Each channel integrates 12bit, 29KHz PWM generator Independent channel color configuration register Independent channel brightness control register 3 programmable RGB libraries for easy software writing Can support 4 devices cascade Support up to 400KHz fast I2C mode

查看详情

[size=14p x]For more detailed information, please view LP50XXdatasheet, for more LED selections, please visit TI's official website: LED Selection.

85)]Take the LP50XX series as an example: The LP50XX series is TI's new generation of RGB three-color light drivers. It can control multiple channels of RGB three-color lights while occupying very few MCU resources, and achieve precise constant current, brightness, color changes, and pattern combinations. The light efficiency achieved by this product brings a unique human-computer interaction experience to the sweeping robot. The simplicity of its development is also conducive to the rapid launch of products.

LP50XX parameters: Supports multiple channel selections: 36/30/24/18/12/9-Ch VCC range: 2.7V to 5.5V Constant current control, maximum 25.5mA per channel in the full voltage range, up to 35mA when VCC is greater than 3.3V; Ultra-low shutdown current 1uA (Max.), low standby power consumption 10uA (Typ.) Each channel integrates 12bit, 29KHz PWM generator Independent channel color configuration register Independent channel brightness control register 3 programmable RGB libraries for easy software writing Can support 4 devices cascade Support up to 400KHz fast I2C mode

查看详情

For more detailed information, please see LP50XXdatasheet, for more LED selections, please visit TI's official website: LED Selection.

85)]Take the LP50XX series as an example: The LP50XX series is TI's new generation of RGB three-color light drivers. It can control multiple channels of RGB three-color lights while occupying very few MCU resources, and achieve precise constant current, brightness, color changes, and pattern combinations. The light efficiency achieved by this product brings a unique human-computer interaction experience to the sweeping robot. The simplicity of its development is also conducive to the rapid launch of products.

LP50XX parameters: Supports multiple channel selections: 36/30/24/18/12/9-Ch VCC range: 2.7V to 5.5V Constant current control, maximum 25.5mA per channel in the full voltage range, up to 35mA when VCC is greater than 3.3V; Ultra-low shutdown current 1uA (Max.), low standby power consumption 10uA (Typ.) Each channel integrates 12bit, 29KHz PWM generator Independent channel color configuration register Independent channel brightness control register 3 programmable RGB libraries for easy software writing Can support 4 devices cascade Support up to 400KHz fast I2C mode

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For more detailed information, please see LP50XXdatasheet, for more LED selections, please visit TI's official website: LED Selection.

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5.2 MSP430 Captivate MCU

The MSP430 captivate series MCU is TI's latest generation of capacitive touch solutions. It has the following features: 1) Reliability: The chip has passed IEC61000-4-X certification, which can effectively resist noise and prevent false triggering; 2) Versatility: This solution can be used for touch panels of various materials (glass, plastic, metal), and can also realize simple gesture recognition, proximity sensing and liquid level detection. 3) Low power consumption: TI Captivate MCU follows the ultra-low standby power consumption characteristics of TI MCU, which is very suitable for battery-powered products such as sweeping robots. 4) High resolution: Ultra-high resolution is conducive to realizing touch effects such as sliders and rollers. 5) Easy development: TI provides a complete graphical programming interface that allows you to implement custom design in just 5 minutes. Take the MSP430FR2522 product as an example: 102)]The main parameters of MSP430FR2522 are as follows:

1) 15 I/O ports, of which 8 I/O can be used for capacitive sensing.

2) The maximum frequency supports 16Mhz, and 7KB FRAM storage space.

3) Built-in 8 10-bit ADCs.

4) Ultra-low standby power consumption: normal operation (120uA/MHz), standby mode (<4uA), shutdown mode (36nA).

5) VQFN, TSSOP package optional. For the two human-computer interaction functions mentioned above, TI has integrated and customized a reference design TIDA-01559. It uses the MSP430FR2522 MCU and LP5569 LED driver, which can achieve extremely low standby power consumption and reduce MCU load resources through LED engine control. This solution can be used in applications that require low-power HMI with excellent EMI performance and moisture resistance, and the design can be used in sweeping robot products. The system block diagram and physical diagram of the reference design are shown below. The functions that can be realized include: 1) Using the MSP430FR2522 to realize glass/plastic panel touch buttons and proximity wake-up.

2) Use LP5569 realizes the special effects of RGB three-color light ring (breathing, flashing, gradient, etc.)

3) Use LP5569 with MSP430FR2522 realizes LED flashing and hand touch into a follow-up effect.

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If you are interested in this reference design, you can visit TI's official website for more information: TIDA-01559, where you can find design documentation, design source files (SCH, PCB, software source code), test reports, BOM and other files.

月下良缘

Thanks for sharing!

alan000345

Thank you for your hard work. It's really nice to share.

英尚微电子

Thanks for sharing~~

alan000345

Please share similar technical articles.

yaoquan5201314

Thanks for sharing, great introduction!