SiRuiPu car driving recorder solution meets the needs of peripheral chips

The car driving recorder is a digital electronic recording device that records and stores data such as vehicle speed, time, location, and audio and video data, and can output data through data communication. It can prevent key drivers from speeding, fatigue driving and other traffic violations, and plays an active role in serving road traffic accident analysis and identification. From the perspective of signal chain and power management, SiRuiPu can provide a full set of peripheral chip solutions.

SiRuiPu driving recorder application solution

SiRuiPu Power Management Products

0****1

DCDC

The car driving recorder is powered by the car battery. The MCU, interface, wireless module, etc. all require low voltage power supply, so one or two stages of DCDC power supply are needed to reduce the battery voltage to low voltage.

As primary power supplies, TPP60508**** and TPP60308 have an input voltage of up to 60V. For passenger car 12V batteries and commercial vehicle 24V battery systems, they have sufficient design margins to prevent high-voltage pulses from damaging the primary power supply. At the same time, the soft-start function can control the rising slope of the output voltage when it is turned on to eliminate system overshoot.

As a secondary power supply, TPP36308 can provide an output current of up to 3A in TSOT23-6 package. The synchronous rectification integrates high-side and low-side MOSFETs to reduce the number of peripheral devices and improve power efficiency. The switching frequency is available in two versions: 400kHz and 1MHz. The former can reduce EMI interference, while the latter can reduce the inductor size, thereby saving PCB area.

TPP60508/TPP60308

Input voltage range: 4.5V~60V

Output current: 5A/3.5A

Switching frequency: 100kHz~2.5MHz

Package: DFN4X4-10, ESOP8

TPP36308

Input voltage range: 4.5V~36V

Output current: 3A

Switching frequency: 400kHz/1MHz

Package: TSOT23-6

0****2

LDO

Some modules have higher requirements for power supply noise, such as GPS and Bluetooth modules. LDO can further reduce the power supply noise output by DCDC.

The high-performance LDO TPL910A has an output current of up to 1A, and is available in 1.2V/1.8V/3.3V/5V fixed voltage output and 0.8V~6V adjustable voltage output versions, which can meet the needs of various output voltages. The 4.5μVRMS ultra-low noise and up to 80dB PSRR can meet the power supply needs of various RF modules.

Universal LDO TPL740, output current 500mA, output has various fixed voltage outputs of 1.2V3.3V and 0.8V5V adjustable voltage output versions, multiple package versions are flexible to choose from.

TPL910A

Input voltage range: 2.2V~6.5V

Output current: 1A

PSRR: 80dB@1kHz

Output noise: 4.5μVrms

Package: DFN3X3-8

TPL740

Input voltage range: 2.4V~5.5V

Output current: 500mA

Dropout: 400mV@500mA

Package: SOT23-5, SC70-5, SOT89-3, DFN1X1-4

0****3

Linear charging chip

The national standard stipulates that the car driving recorder can still record time and data when the external power supply and the host power supply battery are disconnected, so a backup battery is needed in the system, so it can be charged with a linear charger. The input voltage of TPB4056A is as high as 26.5V, which can avoid damage caused by input voltage pulses; the charging current is as high as 1A, and it can also be set to other currents through the pin to meet different design requirements.

TPB4056A

Input voltage range: 4V~6.1V, maximum withstand voltage 28V

Charging current: 1A max

Standby current: 50μA

Package: DFN2X2-8, ESOP-8

0****4

Efuse

To prevent certain peripherals (such as cameras) from overcurrent or short circuit, which may cause rapid battery consumption, the electronic fuse Efuse can limit the current to provide protection.

As a 12V Efuse, TPS14P50 adopts a small 3mmX3mm package, has very few peripheral devices and provides multiple protection modes; it can provide effective protection for overload, short circuit, voltage surge, surge current and reverse current; the current limit value is flexibly adjustable from 2A to 5A with an accuracy of ±15%; the internal clamping circuit can limit the input voltage to a fixed maximum value without the need for external devices.

TPS14P50

Input voltage range: 4.5~14V, maximum withstand voltage 20V

Current range: 2A~5A adjustable

Current accuracy: 15%

Package: DFN3X3-10

3Pulse Signal Chain Products

0****1

CAN

The vehicle status information (such as speed, high and low beam, etc.) needs to be obtained by communicating with the vehicle through the CAN bus.

The TPT1042V**** meets the physical layer requirements of the ISO11898 high-speed CAN specification and has certified EMC, data rates up to 5Mbps, and the industry's highest ±70V bus fault voltage and **±15kV air discharge and contact discharge** provide excellent protection features for the system. The internal logic level conversion function implemented by the VIO pin allows the transceiver I/O to be directly connected to the 3.3V or 5V logic level to communicate with a 3.3V or 5V MCU.

TPT1042V

Supply voltage range: 4.5V~5.5V

Communication rate: 5Mbps

Bus fault protection voltage: ±70V

ESD: IEC 61000-4-2 Contact ±15kV

Package: DFN3X3-8L, SOP8

0****2

RS232 / RS485

In addition to the CAN interface, the car driving recorder also needs RS232/RS485 for internal debugging or external communication. The RS232 chip TPT3232E supports a wide range of 3-5.5V power supply, a maximum rate of 250kbps, can support two transmit and two receive, and provides a variety of packaging options. The RS485 chip TPT75176H supports a wide range of 3-5.5V power supply, a communication rate of 10Mbps, can be expanded to up to 256 nodes, and provides ±15kV ESD protection.

TPT3232E

Supply voltage range: 3V~5.5V

Communication rate: 250kbps

ESD: IEC 61000-4-2 Contact ±12kV

Package: SSOP16, SOP8, TSSOP16

TPT75176H

Supply voltage range: 3V~5.5V

Communication rate: 10Mbps

ESD: IEC 61000-4-2 Contact ±15kV

Package: SOP8, MSOP8, DFN3X3-8

0****3

Operational Amplifier

The car driving recorder needs to record the in-car audio in real time, and the microphone audio signal needs to be amplified before being transmitted to the audio ADC. The low-voltage op amp TP241x and the high-voltage op amp TPA268x have multiple channel options, low noise and good THD+N performance, which are particularly suitable for audio applications, and provide a variety of packaging options.

TP241x

Supply voltage range: 2.2V~5.5V

Number of channels: 1, 2, 4 channels

Bandwidth: 10MHz

Noise: 8.2nV/√Hz

THD+N：0.0005%

Package: SOT23, MSOP8, SOIC8

TPA268x

Supply voltage range: 8V~36V

Number of channels: 1, 2 channels

Bandwidth: 20MHz

Noise: 10nV/√Hz

THD+N：0.0005%

Package: SOT23, SOP8, MSOP8, TSSOP8

0****4

Video filter driver

For analog cameras used for in-vehicle video monitoring, when the output amplitude is low, a video amplifier is needed to amplify the signal. TPF131/TPF141 supports HD/FHD, can support AC or DC coupled input, can achieve 6dB gain amplification, and can drive two video loads.

TPF131/TPF141

Supply voltage range: 3V~5.5V

Bandwidth: 36MHz HD/72MHz FHD

Gain: 6dB

Package: SOT23-6

0****5

Power monitoring and reset chip

Some processors/MCUs need to be equipped with monitoring chips to detect the power supply voltage and send a reset signal to reset the system when an abnormality occurs. TPV803/TPV809**** is an open-drain/push-pull output voltage monitoring chip with power consumption as low as 2.2μA and multiple reset threshold voltage versions are available.

TPV803/TPV809

Monitoring voltage range: 1V~5.5V

Output: Open-Drain/Push-Pull Active-low output

Package: SOT23-3, SOT23G-3

0****6

Comparator

The car driving recorder uses comparators to make quick judgments when processing some abnormal state detection. LM2903A supports low-voltage and high-voltage power supply, with power consumption as low as 150μA per channel and a wide common-mode input voltage range.

LM2903A

Supply voltage range: 2.5V~36V

Number of channels: 2 channels

Package: SOP8, MSOP8