Genaral Description
The AK8999A is a piezoresistive semiconductor pressure sensor control IC that compensates temperature drifts and sensor variations. Variations in the sensor can be corrected with compensation values stored in an integrated non-volatile memory (EEPROM).
The primary characteristics and its associated temperature drifts of pressure sensors are corrected with the 1st order coefficient for temperature compensation or the quasi 2nd order coefficient for temperature compensation by piecewise linear approximation (1st order independent coefficients can be set for high and low temperature side on the basis of 25C) by integrated temperature compensation circuits for offset voltage and span voltage.
The AK8999A integrates two pressure threshold detectors. When a pressure exceeds the detection threshold stored in the EEPROM is applied, the DET1 and the DET2/PTH pins output “H” or “L” (the output polarity is selectable). This output can be used as a control signal of pressure switch applications. Accessing to the AK8999A is made via the 2-wire serial interface on CSCLK pin and VOUT pin (set as digital I/O mode) for setting functions and storing compensation values.
The AK8999A is available in a 16-pin UQFN package, in wafer form or in a die on a tray.