天天爱棋牌

AFE
CS1258
MAIN PARAMETERS

Eight-polar and multi-frequency body impedance measurement 

Built-in 24 bit ADC with 19.5 bits effective resolution 

Supports phase angle, respiration rate and heart rate measurement 

3-wire serial communication

Introduction

The CS1258 is an high performance eight-polar measurement AFE chip, which integrates ΣΔ ADC, body impedance measurement module (BIM), and digital filter. The ADC includes MUXP/MUXN with 8 inputs, Level shifting module, programmable low noise gain amplifier (PGA). The BIM module uses a sinusoidal excitation source to convert the body impedance into a voltage signal and send it to the ADC for measurement. It can support multi-electrode and multi-frequency body impedance measurement, phase angle measurement, respiration rate and heart rate measurement.

Features

Input

— Supporting single end input

— Supporting combination of multiple differential input pairs

— Supporting the input voltage level shift function

PGA

— 1/2/4/8/16/32/64/128 times of optional gain

— Up to 100 MΩ equivalent input impedance

BIM

— Supporting 4/6/8 electrode measurement

— Supporting 5K/10K/25K/50K/100K/250KHz frequency measurement

天天爱棋牌 — Supporting measurement of absolute impedance value and phase angle

ADC

— 24-bit resolution

— Optional output rate 10 to 1280 Hz

Valid bits

— 19。5bits effective resolution (Vref =  2。35V, AD Rate = 40Hz, PGA = 128x)

LDO and internal voltage reference

— Build-in LDO, 2。35/2。45/2。8/3。0 V optional output

Supporting the high-performance, common, low power consumption, and sleep modes

Supporting voltage measurement, ,BIM, manual measurement mode, and single command switching

天天爱棋牌 Low drift clock

天天爱棋牌 3-wire serial communication

Applications

Bridge sensor

Weighing

Pressure measurement

Body impedance analysis

Alternating fat measurement

Block Diagram
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DOCUMENT
CS1258_Datasheet_en_V1.2
2019-01-25
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