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 bytes internal RAM 256 bytes external RAM

Working Voltage

Working voltage: 2.7V~ 5.5V@Fosc =8MHz

2.2V ~  5.5V@Fosc =4MHz

Operating Temperature

Working temperature: -40 ℃~+85 ℃

clock system

External low-speed oscillator 32.768KHz

Built in low-speed RC oscillator 128KHz

Built in high-speed RC oscillator 8MHz, with an accuracy of ± 2% @ 5V/25 ℃ (factory calibrated)

Programmable RC oscillator PFG 24~48MHz with built-in automatic frequency hopping function, specially designed for atomizer function

timer

2 16 bit universal timers: Timer 0, Timer 1

General Purpose Input/Output Port (GPIO)

Supports up to 14 GPIO ports

Support push-pull, open drain, pull-up 30K, pull-down 30K, high resistance mode

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

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

P0.6 is a dedicated pin for MOS control, supporting a larger push current of 65mA; @ VDD=5V

TMC function

The clock source for TMC timer can be selected as IRCL or XOSCL

The minimum unit of interruption time is 512 IRCL clock cycles when IRCL is selected as the clock source, and 128 XOSCL clock cycles when XOSCL is selected as the clock source

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, INT2~3 rising edge, falling edge, double edge

Interrupt input pin selection: INT0 (P0.0), INT1 (P0.1), INT2 (P0.2), INT3 (P0.3)

Analog to Digital Converter (ADC)

Supports 14 channels of 12 bit SAR ADC (different models may have different specifications)

Supports 2 types of reference voltage sources: VDD and internal reference

Selecting internal voltage as the reference, VDD voltage can be measured

PWM

Supports 3 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 PWM output pin mapping: PWM0 (P1.4/P0.6), PWM1 (P1.5), PWM2 (P1.6)

Supports 1 hardware cascade module with a scanning frequency of 800Kbps/S, directly controlling WS2812 or similar driver chips, meeting 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)

The detection voltage can be set to 2.7V, 3.3V, 3.7V, 4.2V

Low voltage reset or interrupt can be set

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<33uA

Encapsulation type: SOP16

CA51M720S3 pin diagram