Custom CS1237 24-bit ADC module onboard TL431 external reference chip single-channel weighing sensing 24bit

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Product details

With external voltage regulator, use TL431 chip external voltage (2.5V) as the excitation source of external pressure sensor, voltage is more stable.

Chip function description

CS1237 is a high precision, low power consumption ADC chip, one differential input channel, built-in temperature sensor and

High precision oscillator.

The PGA of the CS1237 can be 1, 2, 64, or 128. The default value is 128.

CS1237 ADC data output rate in normal mode can be 10Hz, 40Hz, 640Hz, or 1.28kHz by default

Is 10Hz;

MCU can communicate with CS1237 through 2-wire SPI interface SCLK and DRDY/DOUT to advance it

Row configuration, such as channel selection, PGA selection, and output rate selection.

1.1 Main functions and features of the chip

Built-in crystal oscillator

Integrated temperature sensor

With the Power down function

2-wire SPI interface, the maximum speed is 1.1MHz

ADC functional characteristics:

24-bit no loss code

PGA magnification: 1, 2, 64, 128

1 24-bit differential input without loss of code, ENOB is 20 bits (5V) 19.5 bits (3.3V) when PGA=128

P-P noise: PGA=128, 10Hz: 180nV;

INL is less than 0.0015%

The output rate can be 10Hz, 40Hz, 640Hz, or 1.28kHz

In-band short function

1.2 Chip Application Scenarios

Industrial process control

Electronic balance

Liquid/gas chemical analysis

hematometer

Intelligent converter

Portable equipment