Human body impedance measurement

Example of impedance measurement circuit for measuring body fat

Human body impedance measurement

Lineup

TVS diode

Part number

DF2B7AFU

Package

USC

VESD (Max) [kV]

±30

VRWM (Max) [V]

5.5 

Ct (Max) [pF]

10.0 

RDYN (Typ.) [Ω]

0.2 

Low noise operational amplifier

Part number

TC75S67TU

Package

UFV

VDD, VSS (Max) [V]

±2.75 

VDD,VSS (Min) [V]

±1.1 

IDD (Max) [μA]

700

VNI (Typ.) [nV/√Hz] @f = 1 kHz

Low current consumption operational amplifier

Part number

TC75S102F

Package

SMV

VDD - VSS (Max) [V]

1.5 to 5.5

VIO (Max) [mV]

1.3

CMVIN (Max) [V]

VDD

IDD (Typ. / Max) [μA]

0.27 / 0.46 (@VDD=1.5 V)

Small-signal MOSFET

Part number

SSM3K15AMFV

Package

VESM

VDSS (Max) [V]

30

ID (Max) [mA]

100

RDS(ON) [Ω] @VGS = 2.5 V

Typ.

3.5

Max

6.0

Polarity N-ch

MCU

Part number

TMPM061FWFG

Maximum operation frequency    

16 MHz

Instruction ROM

128 KB

RAM

8 KB

Timer

9ch

UART/SIO

4ch

ADC 1ch(10bits), 3ch(24bits)
LCDD 40 seg x 4 com

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Frequently Asked Questions

FAQs
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