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High resolution resistive bridge sensor signal conditioning chip

JHM1400 is a high-precision signal conditioning integrated circuit designed for differential resistance bridge or half bridge sensor signals.

The JHM1400 is a high accuracy signal conditioning IC designed for differential resistive bridge sensor signals. The differential voltage signal output by the bridge sensor can be converted to a digital signal with high accuracy and then digitally compensated by the JHM1400. The final measurement can be read out through an I²C or SPI interface.

A low-noise instrumentation amplifier with gain and offset tuning capability amplifies the input bridge signal to a level which fits the input range of a 24-bit delta-sigma A/D converter. The digitized input is compensated for thermal drifts of offset and gain as well as non-linearity in digital domain. A temperature signal from an on-chip sensor is digitized and fed to the compensation circuit, too. The compensation coefficients can be written to the on-chip programmable non-volatile memory (MTP).

The JHM140X supports automatic periodic mode. The integrated IIR low-pass filter and 32-level FIFO can be enabled in this mode, which facilitate low-power application and greatly reduces the workload of the external MCU.

Features


Voltage supply1.8-3.6V
Measurement linearity0.01%
Built-in temperature sensor accuracy(after calibration)±0.5℃
Operating temperature range-40~125℃

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JHM1400 QFN16

  • 24-bit ADC

  • Built-in 32 level FIFO

  • Built-in IIR filter

  • Optional I ² C or SPI communication protocol

  • CYC mode supporting periodic work

  • Integrated nonlinear and temperature compensation algorithm

  • The zero temperature drift, sensitivity temperature drift and nonlinearity of the sensor can be compensated at the same time

  • With non-volatile memory (OTP)

  • The calibration parameters of the sensor can be saved. Up to two calibrations are supported

  • Standby current < 0.1μA

  • Average current≈ 4μA@1Hz ODR

  • Absolute precision of compensated bridge ≈ 0.1%FSO



JHM1400 Block Diagram

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Applications

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