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.
|Built-in temperature sensor accuracy(after calibration)||±0.5℃|
|Operating temperature range||-40~125℃|
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