SOC
CSU1181
MAIN PARAMETERS

4K*16Bit OTP ROM

4*18 LCD Driver

16 I/O

Introduction

CSU1181 is an 8-bit CMOS single-chip MCU. It embeds a 4K × 16-bit OTP ROM, a 24-bit ADC with full differential analog signal input, a low-noise amplifier, and a 4 × 18 LCD driver.

8 bit RISC Core

8 bit RISC Core, and high efficiency C compiler

4K x 16-bit OTP program memory

256-byte data memory (SRAM)

Only 39 single-word instructions

8-level PC storage stack

Oscillator

Built-in 1MHz / 4MHz oscillator

32768 Hz external oscillator (RTC) or 4 MHz to 16 MHz oscillator

Peripheral Features

16 bidirectional I/O ports

10 extensible output port

1 buzzer output

2 external interrupts

4*18 LCD drives

Low-voltage detection (LVD) pin, 2.4V / 2.5V / 2.6V / 2.7V / 2.8V / 3.2V / 3.6V voltage provided internally for comparison

Analog Features

Integrated 24-bit ADC:

— The effectively precision reaches 19 bits(when the PGA gain is 8, the output rate is 32Hz)

— 2 full differential analog input

Integrated programmable gain amplifier (PGA): 8/64/128/256

The output rate of ADC is in the range 3.8Hz to 16KHz

Providing a charge pump inside (2.6 V, 2.8 V, 3.0 V, or 3.2 V)

Providing a voltage stabilizer for the senor and modulator inside

Built-in temperature sensor

Special Features

Power-on reset (POR)

POR and hardware reset delay timer (158 ms)

Low voltage reset (LVR)

Timer 0 — 8-bit timing counter supporting programming and pre-frequency division

Extended watchdog timer (32K WDT) — Programmable time range

Low Power Consumption

Operating current of MCU

— 1mA @ 1MHz, 3.3V in normal mode

— 2mA @ 4MHz, 3.3V in normal mode

— Current in sleep mode lower than 3 μA (startup Bandgap, LDO, and WDT are enabled)

CMOS Technology

Operating voltage:

— DVDD 2.4 V to 3.6 V

— AVDD 2.4 V to 3.6 V

Applications

Electronic weighing instruments

Precision measurement and control system

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