CS8421-EZZR

CS1237 is a high-precision, low-power analog-to-digital conversion chip with a differential input channel, built-in temperature sensor and

High precision oscillator.

The PGA of CS1237 is optional: 1, 2, 64, 128, the default is 128.

ADC data output rate in normal mode of CS1237 selectable: 10Hz, 40Hz, 640Hz, 1.28kHz, default

10Hz;

The MCU can communicate SCLK, DRDY / DOUT through the 2-wire SPI interface

communicate with CS1237,

line configuration, such as channel selection, PGA selection, output rate selection, etc.

1.1 The main functional characteristics of the chip

 Built-in crystal oscillator

 Integrated temperature sensor

 With Power down function

 2-wire SPI interface, the fastest rate is 1.1MHz

ADC features:

 24-bit no missing code

 PGA magnification is optional: 1, 2, 64, 128

 One 24-bit non-missing code differential input, ENOB is 20 bits (5V)\19.5 bits (3.3V) when PGA=128

 P-P noise: PGA=128, 10Hz: 180nV;

 INL less than 0.0015%

 Output rate optional: 10Hz, 40Hz, 640Hz, 1.28kHz

 In-band short function

1.2 Chip applications

 Industrial process control

 Electronic scale

 Liquid/gas chemical analysis

 Blood meter

 Smart Converter

 Portable equipment