Features and summary of WS51F7340 series IoT MCU

1T 8051 core, 16KB Flash, 2KB programmable Boot Loader, 1KB SRAM, 128B EEPROM, 25-channel low-power Touch Key, 1 26-channel 12-bit SAR-ADC, 4 general-purpose timers, 4 pairs of 8-channel 16-bit complementary Output PWM, 1 buzzer output, 2 UARTs, 1 I2C, 1 SPI, 1 WDT, 1 WKT, hardware and software LED driver, software LCD driver.

1 WS51F7340 features 

n Working voltage: 2.0V-5.5V 

n Working temperature: -40-+105℃ 

n Package type: 

SOP28/TSSOP28/SOP24/TSSOP24/SOP20/TSSOP20 

n Core: Enhanced 1T 8051 

n Maximum operating frequency: 16MHz 

n Flash ROM: 16K Bytes, 100,000 times of erasing and writing 

n Boot Loader: 2K Bytes, 100,000 erasing times 

n EEPROM: 128 Bytes, single-byte operation does not require erasing, 100,000 writes 

n SRAM: Internal 256 Bytes, external 1K Bytes 

n clock (3.3V@25℃) 

l External low-speed crystal oscillator LOSC: 32.768KHz 

l Built-in RC oscillator LRC: 32KHz, adjustable accuracy ±2% 

l Built-in RC oscillator HRC: 16MHz, adjustable accuracy ±1% 

n interrupt 

l 9 valid interrupt sources, two levels of interrupt priority 

l 6 external interrupts, configurable for any pin input, supporting rising edge/ 

Lower edge/double edge trigger 

n timer 

l 4 16-bit general-purpose timers 0/1/2/3, compatible with standard 8051 

n IO port 

l 26 general-purpose GPIO ports 

l Support push-pull/open-drain/pull-up/pull-down/high-impedance modes 

l Pull-up is optional 60KΩ or 10KΩ, pull-down is 15KΩ 

l Push current supports 25mA, sink current 60mA 

n Universal serial interface (UART) 

l 2 UART interfaces: UART0 and UART1, compatible with standard 8051 

n SPI interface (SPI) 

l Supports master-slave mode, the maximum speed can reach 1/4 Fsys (system clock) 

n I2C interface (I2C) 

l Built-in 1-way I2C interface, supports master-slave mode, supports standard/ 

Quick mode 

n Watchdog (WDT) 

l 15-bit watchdog timer, counting clock is LRC/LOSC clock 

l 8-bit adjustment accuracy, adjustment range is 7.8125ms-1s 

l Configurable watchdog to generate reset or interrupt 

n Self-wake-up timer (WKT) 

l Optional interrupt time is 3.90625ms~1s, supports interrupt wake-up

n Buzzer driver (BUZZER) 

l Supports 1 buzzer output, configurable output frequency 

n Pulse width modulation (PWM) 

l 4 pairs of 8-channel 16-bit PWM, the period and duty cycle can be configured arbitrarily 

l Optional clock source, which can directly output the internal clock 

l Support complementary output and dead zone control 

n Low voltage detection (LVD) 

l 8-level voltage detection 1.8/2.0/2.4/2.8/3.0 /3.4/3.7/4.2V 

l Low voltage reset or interrupt can be set 

n Touch button (

Touch Key) 

l Up to 25 channels, support sharing with software LED driver 

l Configurable scanning channels, up to 16 channels in a single scan, 

l Support touch wake-up, at this time, the power consumption increases by 0.3uA for each additional channel 

l Can pass dynamic CS-10V and EFT-4KV tests 

n Analog-to-digital converter (ADC) 

l Up to 26 channels 12-bit precision SAR-ADC 

l Maximum conversion speed up to 1MHz 

l Internal magnification 1/2/4/6/8/10/12/15/20 

l Internal reduction factor 1/4, 1/3 and 1/2 

l Built-in 1/16 reference, 1/4 VDD5 channel and internal LDO channel 

l Support comparator function 

n Hardware/software LED driver (LED) 

l Supports up to 14seg*8com hardware LED driver, configurable driver 

Dynamic strength and duty cycle, the COM port supports a maximum current of 120mA 

l Supports software to drive LEDs in turn through COM scanning, supporting up to 

25seg*26com 

n Software LCD driver (SLCD) 

l Supports 1/2 bias software LCD driver 

l Supports up to 8 COMs 

n chip reset 

l Supports hard reset, soft reset, watchdog reset, LVD reset and 

Power on/power down reset 

n Program encryption and protection 

l Built-in program read protection 

l Built-in program ID encryption protection function 

n Program download and simulation 

l Supports ISP and IAP, IAP configurable size 

l Support online simulation function 

n Low power consumption 

l Minimum current in IDLE mode is 4.5uA 

l Minimum current in STOP mode 1.8uA 

l Internal LRC operating power consumption 6uA 

l 16Mhz@5V running typical power consumption 1.5mA 

n Anti-interference characteristics 

l EFT > ±4KV 

l ESD HBM > ±8KV 

l Latch up > 200mA

2 WS51F7340 Overview 

The WS51F7340 series chip is an 8-bit microcontroller based on the enhanced 1T 8051 core. The instructions are fully compatible with the traditional 8051, and the running speed is 10 times faster than the traditional 8051. WS51F7340 integrates 16KB Flash, 2KB programmable Boot Loader, 128B independent EEPROM, 1KB SRAM, 25-channel low-power Touch Key, 1 26-channel 12-bit precision ADC, hardware/software LED driver, software LCD driver, 4 pairs of 8 channels 16 Bit complementary output PWM, 1 buzzer output, 4 general-purpose 16-bit timers, 2 UARTs, 1 I2C, 1 SPI, 16MHz internal RC oscillator, 32KHz internal RC oscillator, 32.768KHz external crystal oscillator, 26 GPIO and other resources. In order to improve chip reliability, WS51F7340 also integrates power-on and power-off reset, 8-level optional low-voltage detection (LVD), low-power independent watchdog counter (WDT), self-wake-up timer (WKT) and other modules. WS51F7340 has excellent anti-interference capabilities and low power consumption characteristics, and is very suitable for use in IoT industrial control and consumer electronics fields such as home lighting, control switches, large and small appliances, and wireless communications.