Operating Voltage



Operating Current




Gain = 100

Gain = 100






IC Introduction

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.

IC Features
  • 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

IC Block Diagram
Application area

Portable Scale

Tire Pressure Scale

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