CS1253 consists of an ADC signal link and a body impedance measurement module (BIM). The ADC signal link includes an input MUXP/MUXN, a programmable low noise gain amplifier (PGA), a Sigma delta ADC, and a digital filter. The MUXP/MUXN has three internal input channels, PGA and ADC have multiple gain options, and the digital filter can be configured for multiple output rates. The human body impedance measurement module uses a sinusoidal excitation source to convert the human body impedance into a voltage signal and sends it to the ADC signal chain for measurement. It supports multi-electrode and multi-frequency human body impedance measurement. It is suitable for portable devices such as b and watches to measure fat.
BIM
-Supports 4-electrode measurement
-Supports 5 kHz/10 kHz/25 kHz/50 kHz/100 kHz/250 kHz multi gear frequency measurement
-Supports absolute impedance value and phase angle measurement
ADC
-24-bit resolution
-Output rate of 10~1280 Hz; optional 8 gears
LDO and internal reference voltage
-Self-contained LDO, output 2.35/2.45/2.8/3.0 V selectable
Supports performance, normal, low power, and sleep modes
Supports voltage measurement, BIM measurement, and manual measurement modes with single command switching
Low drift on-chip clock
Three-wire serial communication
The dynamic range can be optimized based on the wearable scenario, which is suitable for high contact impedance measurement with small electrodes
Core sea 8-bit MCU/SOC integrated development environment
1. Integrated C compiler, assembler, linker, debugger
2. Support standard C language and assembly language development 3 Example code of integrated chips