kernel

CPU：1T 8051, 10 times faster than traditional 8051 with higher speed

Compatible with 8051 instruction set, dual DPTR working mode

memory

MTP program memory: 4KB, with over 1000 repeated erasures

EEPROM: 512 Byte， Used to store data that needs to be saved in case of power failure, with over 100000 repeated erasures

RAM: 256 Byte internal RAM, 256 Byte external RAM

Working Voltage

Working voltage: 2.2V~5.5V

Operating Temperature

Working temperature: -40 ℃~+85 ℃

clock system

Built in low-speed RC oscillator: 128KHz

Built in high-speed RC oscillator: 12MHz, accuracy of ± 2% @ 5V/25 ℃ (factory calibrated)

timer

2 16 bit universal timers: Timer 0, Timer 1

General Purpose Input/Output Port (GPIO)

Supports up to 6 GPIO ports

Supports push-pull, open drain, pull-up, pull-down, and high impedance modes

When push-pull output is used, GPIO has 4 levels of selectable push current: 12mA, 10mA, 8mA, 6mA;  @VDD=5V 

When push-pull output is used, there are 2 levels of GPIO current options: 16mA, 8mA;  @VDD=5V 

TMC function

The clock source is a built-in low-speed RC oscillator, with a minimum interruption time unit of 512 low-speed RC oscillator clock cycles

Configurable interrupt time ranges from 1-256 minimum unit times

Interrupt system

7 valid interrupt sources

Two level interrupt priority, supporting interrupt nesting

5 external interrupt sources INT0~INT4

External interrupt trigger edge selection: INT0~1 (rising edge, falling edge), INT2~4 (rising edge, falling edge, double edge)

Interrupt input pin selection: INT0 (P0.0), INT1 (P0.1), INT2 (P0.2), INT3 (P0.3), INT4 optional (P0.4) or P0.5 pin is the interrupt input pin

Touch Key

Built in touch sensing controller, no external capacitor required

Greater support for 6 touch channels

High anti-interference performance, in compliance with CS standards, EFT 4KV 

Support touch interrupt and touch low power mode

PWM 

Supports 4 PWM outputs, each can be individually controlled, and the cycle and duty cycle can be configured freely within the 16 bit range

Supports direct output of internal clock function and PWM interrupt function

Support pin mapping for PWM2 and PWM3 outputs: PWM2 (P0.0/P0.4), PWM3 (P0.1/P0.5)

RGB-LED cascade

Support 1 hardware cascade control module, directly control WS2812 or similar driver chips, can be used for the requirements of monochrome or rainbow RGB-LED strip products. Support 800Kbps/S scanning frequency 1 hardware cascade module, directly control WS2812 or similar driver chips, meet the requirements of monochrome or rainbow LED strip products

Universal Serial Interface (UART1)

Support 1 full duplex serial port

Support 1-byte receive cache

I2C interface

Built in 1 I2C interface, supports master-slave mode, and supports standard/fast/high-speed modes

Low Voltage Detection (LVD)

Configurable low voltage detection mode, range 2.0-4.8V (per 0.1V level), supports low voltage reset or interruption

The external voltage detection mode can be configured, with a range of 1.7-4.8V (per 0.1V level). The input voltage can be detected through pins P0.0 and P0.3, which can achieve a similar ADC function to detect battery voltage.

Reset mode

The chip supports multiple reset sources: power on/off reset, soft reset, hard reset, watchdog reset, low voltage detection reset

watchdog

27 bit watchdog timer, 16 bit adjustment accuracy, configurable watchdog reset or interrupt

Program download and simulation

Support ISP download of programs

Support online simulation function

low power consumption

STOP mode, current<7uA

IDLE mode, current<25uA

Encapsulation type: SOP8

CA51M551S1A Pin Diagram