The SD8709 is a CMOS SoC with built-in 24 bits ADC and abundant peripheral resources including: RTC, selectable voltage sources, flexible PGIA, voltage step-up module, UART, I2C, SPI, TIMER, PWM/PDM, PFD, CAPTURE, and LCD driver.
The 16k Bytes OTP can be programmed in situ and the 2.4~3.6V programming voltage is internally generated. The OTP can be used in place of external EEPROM.
The IC was designed with ultra-low power technology. The typical total operating current is only 1mA (IAD = 0) or 1.5mA (IAD = 1).
Three working modes are provided so users can select the optimum choice between speed and power. They are normal mode, standby mode, and sleep mode.
High precision ADC, 18.8bit ENOB at 8sps It can be set to 2 differential or 4 single-ended inputs
Low noise, high input impedance preamplifier with selectable gain options: 1,12.5, 50, 100, or 200
8 bits RISC ultra-low power MCU. The typical MCU current consumption is: 300uA at 3V and 2MHz operating clock rate, 1.5uA at standby and 32kHz clock, and less than 1uA at sleep
16K Bytes OTP, 512 Bytes SRAM
OTP with low programming voltage, can replace external EEPROM
Multiple clock sources, flexible clock selection, and external oscillator malfunction detection
ADC output rate: 8~2kSPS
24SEG * 4COM LCD drive with ultra-low power consumption and high driving capability. It has a programmable boost module to maintain luminance at low supply voltage and supports gray scale adjustment
Built-in temperature sensor supports single point calibration
1.2V low temperature drift voltage reference output
Selectable voltage source for external transducer excitation: 2.4V/2.6V/2.9V/3.3V
Flexible battery voltage detection is 2.0~3.3V
ADC has external or internal voltage reference with multiple voltage options
RTC module provides secondary output
Abundant peripheral resources: UART, I2C, SPI, PWM/PDM, PFD, TIMER, CAPTURE
Low voltage detection and power on reset circuit
Operating voltage range: 2.4~3.6V
Operating temperature range: -40~85 ˚C