AN3308 datasheet(50/52 Pages) STMICROELECTRONICS

Part #	AN3308

Description	This document describes the low-voltage 3-axis digital output linear MEMS accelerometer provided in an LGA package

PDF	52 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Auxiliary ADC

AN3308

50/52

Doc ID 18198 Rev 1

Auxiliary ADC

The LIS3DH is provided with an auxiliary 10-bit ADC converter multiplexed on the ADC1,

ADC2, and ADC3 input pins of the device, therefore allowing the conversion of external

analog signals, such as analog output gyroscopes, to the digital world. The digitized data

can then be read from the device by reading registers OUT_ADC1_L, OUT_ADC1_H,

OUT_ADC2_L, OUT_ADC2_H, OUT_ADC3_L, and OUT_ADC3_H. The conversion status

is reported in the STATUS_AUX (07h) register; when auxiliary ADC data are ready, the

321DA bit of the STATUS_AUX register is set to 1.

The status of the 321DA bit can be driven to the INT1 pad by setting the I1_DRY2 bit of

CTRL_REG3 to 1.

The auxiliary ADC is enabled by setting the ADC_PD bit of TEMP_CFG_REG (1Fh) to 1.

10.1

Temperature sensor

The LIS3DH is supplied with an internal temperature sensor. Temperature data can be

enabled by setting the TEMP_EN bit of the TEMP_CFG_REG register to 1. When the

auxiliary ADC and temperature sensor are enabled, the third channel of the ADC is used to

digitize temperature sensor output and can be read inside the OUT_3_L and OUT_3_H

registers as 2’s complement data.

AN3308 Datasheet(PDF) 50 Page - STMicroelectronics