AK8996/W中文资料Pressure Sensor control IC

(Detector×1ch, Second order temperature compensation, SPI I/F)数据手册AKM规格书

描述 Description

The AK8996 is a pressure sensor interface IC that features compensation for temperature drift and sensor variation. It is designed to excite and interface to a bridge sensor. Variations in the sensor can be corrected via compensation values stored in integrated non-volatile memory (EEPROM). Compensation values are obtained from measurement results for a set of offset voltages and temperature drift, along with a set of bridge voltages and temperature drift, including characteristics of the AK8996. The internal compensation circuit is accomplished through DACs, with 4-bit and 7-bit resolution to adjust offset voltage of the sensor, and the secondary characteristics compensator for the associated temperature drift, coupled with 9-bit resolution to adjust the span voltage and another secondary characteristics compensator for its associated temperature drift. Depending on the application, the internal EEPROM values can be pre-configured to enable adjustment of the reference sensitivity and the output reference voltage. Depending on the application, the AK8996’s internal EEPROM values can be preconfigured to enable adjustment of the reference sensitivities and output reference voltages. Sampling frequencies can be switched between 100Hz, 1kHz, 2kHz and 10.24kHz using the internal EEPROM data. The AK8996 is provided with a pressure detection circuit. If the applied pressure exceeds the defined voltage threshold at the PTH terminal, a high-level signal is output on the DET pin. The threshold can be adjusted by the internal EEPROM data. The AK8996 is also provided with a self-diagnostic function. Upon power-up or at initial operation immediately after exiting standby mode, this self-test feature checks for the required value at the output (VOUT pin), and if an expected value is not available, the output is assumed to be anomalous and a high-level signal is output on the DET pin, in the same manner as with the pressure detection.