The chip from the left is CA51F253L3-S2 CACHIP.

The CA51F2 series chip is an 8-bit microcontroller based on the 1T 8051 core. Under normal circumstances, it runs 10 times faster than the traditional 8051 chip and has superior performance. Built-in Flash program memory can be reprogrammed multiple times. This series of chips provides three Flash capacities of 8 / 16 / 32K for customers to choose according to product needs, which brings great convenience to user development. It not only retains the basic characteristics of the traditional 8051 chip, but also integrates functional modules such as ADC, LCD/LED driver, Touch Key, PWM, UART, RTC, brushless DC motor driver, multiplier and divider, and low voltage detection (LVD). Supports three power-saving modes: IDLE, STOP and low-speed operation to adapt to applications with different power consumption requirements. The powerful functions and superior anti-interference performance make it widely used in various car audios, home audios, small appliances, Bluetooth speakers, automotive electronics, digital motors, sports equipment, motor control, medical care, instrumentation, security, and power supplies. control, industrial control and doorbell products.

Basic features
 Core
 CPU: 1T 8051, the maximum speed is 10 times faster than the traditional 8051
 Compatible with 8051 instruction set, dual DPTR working mode
 CPU frequency: up to 24MHz supported
 Memory
 Flash: 8 / 16 / 32K bytes, supported Repeatedly erase and write multiple times
 Flash can be divided into program space and data space. The data space can be used to store data that needs to be saved when power fails. EEPROM can be omitted
 RAM: 256 bytes internal RAM, 2K bytes external RAM
 Working voltage
 Working voltage : 1.8 - 5.5V wide voltage operating range
 Clock system
 External high-speed oscillator: 1 - 24MHz
 External RTC oscillator: 32.768KHz
 Built-in low-speed RC oscillator: 131KHz
 Built-in PLL: frequency multiplication multiple is 2 - 10 times, Reference clock is 2 - 4MHz built-in RC oscillator
 Built-in high-speed RC oscillator: 2 - 4MHz, accuracy up to 1% (factory initial frequency is 3.6864MHz＠3.3V/25℃)
 Built-in external clock monitoring module, can effectively Monitor the working status of various external clocks to avoid crashes caused by external clock oscillation
 C RTC function
 The built-in RTC module can time, minutes, seconds, days of the week, and days, and supports the alarm clock function
 Supports millisecond and half-second interrupts
 Interrupt system
 15 Effective interrupt sources
 Two levels of interrupt priority, supporting interrupt nesting
 10 external interrupt sources, each external interrupt can be configured with any signal pin as an interrupt input pin
 Timer
 Three 16-bit general-purpose timers: timer 0, timer 1, timer 2
 General-purpose input and output port (GPIO)
 Supports up to 62 GPIO ports, supporting push-pull, open-drain, pull-up, and pull-down , High-impedance mode
 When pushing-pull output, a single GPIO push current supports 20mA, and sink current supports 40mA
 Touch Key (Touch Key)
 Built-in touch sensor controller
 Supports a maximum of 24 touch channels
 High anti-interference performance, compliant with EMC (CS) ) Standard
 Can work normally in STOP mode, supports touch wake-up in STOP mode
 Analog//digital converter (ADC)
 Supports 8-channel 12-bit SAR ADC, built-in op amp and comparison function
 Supports 3 reference voltage sources: VDD , internal reference, external reference
 The VDD voltage can be measured when the internal voltage is selected as the reference voltage
 Supports detection signal reduction and amplification functions, the scaling factor is optional
 PWM
 Supports 8-channel PWM, and the period and occupancy can be configured arbitrarily within the 16-bit range Duty ratio
 Support complementary mode and dead zone control, can be used to drive brushless DC motors
 Support settable edge alignment and center alignment modes
 Support direct output of internal clock function
 Support PWM interrupt
 LCD driver
 Support up to 8com x 32seg , 7com x 33seg, 6com x 34seg, 5com x 35seg, 4com x 36seg
 Configurable duty cycle: 1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8 Duty
 Configurable bias voltage: 1/2, 1/3, 1/4 Bias
 Support 8 levels of contrast adjustment
 Support 3 levels of drive current, users can adjust according to different LCD screens
 LED driver
 Support up to 8com x 32seg
 Supports 8 levels of brightness adjustment
 Low voltage detection (LVD)
 Configurable voltage detection range 1.8 - 4.8V
 Can set low voltage reset or interrupt
 Reset mode
 The chip supports multiple reset sources: hard reset, soft reset, Watchdog reset, low voltage detection reset, power-on/power-down reset
 Watchdog
 27-bit watchdog timer, 16-bit adjustment accuracy, configurable watchdog reset or interrupt

 Remote control receiving function
 Built-in sampling counter module (SAMPLE), which can sample pulse widths of any length through hardware modules, reducing software code
 Universal serial interface (UART)
 Supports up to 3 UART interfaces
 Supports 1-byte receive buffer
 I SPI interface
 Built-in 1 4-wire SPI interface, supports master-slave mode
 II 2 2 CC interface
 Built-in 1 I 2 C interface, supports master-slave mode, supports standard/fast/high-speed mode
 Operational amplifier and analog comparator
 Supports 4 analog comparators, two operational amplifiers and a capture counter
 The analog comparator reference voltage can select an internal reference or an external input reference
 The analog comparator has a built-in 15-bit digital filter and supports comparator interrupts
 The operational amplifier can be combined with ADC and analog comparator are used together to expand the detection signal voltage range
. Capture counter and analog comparator are used together to measure motor speed and stall detection.
Brushless DC motor drive
. Built-in 60° Hall and 120° Hall decoding. Module
 Supports automatic mode and manual mode, supports braking function
 Supports multiple abnormality detection
 Combined with analog comparator, it can realize Huo-free DC motor drive
 Multiplier and Divider (MDU)

Support for Avatto WT410-BH #318

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