Data Sheet

ADXL356/ADXL357/ADXL357B

REGISTER DEFINITIONS

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Rev. C | 49 of 52

Table 49. Bit Descriptions for Range (Continued)

Bits

Bit Name

Settings

Description

Reset

Access

10 ±20 g.

11 ±40 g.

POWER CONTROL REGISTER

Address: 0x2D, Reset: 0x01, Name: POWER_CTL

Table 50. Bit Descriptions for POWER_CTL

Bits

Bit Name

Settings

Description

Reset

Access

[7:3]

Reserved

Reserved.

0x0

R

2

DRDY_OFF

Set to 1 to force the DRDY output to 0 in modes where it is normally signal data ready.

0x0

R/W

1

TEMP_OFF

Set to 1 to disable temperature processing. Temperature processing is also disabled when standby = 1.

0x0

R/W

0

Standby

Standby or measurement mode.

0x1

R/W

1

Standby mode. In standby mode, the device is in a low power state, and the temperature and acceleration

datapaths are not operating. In addition, digital functions, including FIFO pointers, reset. Changes to the

configuration setting of the device must be made when standby = 1. An exception is a high-pass filter that

can be changed when the device is operating.

0 Measurement mode.

SELF TEST REGISTER

Address: 0x2E, Reset: 0x00, Name: SELF_TEST

Refer to the Self Test section for more information on the operation of the self test feature.

Table 51. Bit Descriptions for SELF_TEST

Bits

Bit Name

Settings

Description

Reset

Access

[7:2]

Reserved

Reserved.

0x0

R

1

ST2

Set to 1 to enable self test force

0x0

R/W

0

ST1

Set to 1 to enable self test mode

0x0

R/W

RESET REGISTER

Address: 0x2F, Reset: 0x00, Name: Reset

Table 52. Bit Descriptions for Reset

Bits

Bit Name

Settings

Description

Reset

Access

[7:0]

Reset

Write Code 0x52 to reset the device, similar to a power-on reset (POR)

0x0

W

For the ADXL357 (fixed on the ADXL357B), in case of a software reset, an unlikely race condition may occur. If the race condition occurs,

some factory settings in the NVM load incorrectly to shadow registers (the registers from which the internal logic configures the sensor and

calculates the output after a power-on or a software reset). The incorrect loading of the NVM affects overall performance of the sensor, such

as an incorrect 0 g bias and other performance issues. The incorrect loading of NVM does not occur from a power-on or after a power cycle.

To guarantee reliable operation of the sensor after a software reset, the user can access the shadow registers after a power-on, read and

store the values on the host microprocessor, and compare the values read from the same shadow registers after a software reset. This method

guarantees proper operation in all devices and under all conditions. The recommended steps are as follows:

1. Read the shadow registers, Register 0x50 to Register 0x54 (five 8-bit registers) after power-up, but before any software reset.

2. Store these values in a host device (for example, a host microprocessor).

3. After each software reset, read the same five registers. If the values differ, perform a software reset again until they match.