LPS35HW datasheet(33/48 Pages) STMICROELECTRONICS

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LPS35HW

DocID029129 Rev 1

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8.5

CTRL_REG1 (10h)

Control register 1

Table 18: CTRL_REG1 (10h) register

ODR2

ODR1

ODR0

EN_LPFP

LPFP_CFG

BDU

SIM

ODR [2:0]

Output data rate selection. Default value: 000 Refer to Table 19: "Output data rate bit

configurations".

EN_LPFP

Enable low-pass filter on pressure data. Default value: 0 (0: Low-pass filter disabled; 1:

Low-pass filter enabled)

LPFP_CFG

LPF_CFG: Low-pass configuration register. Default value:0 Refer to Table 20: "Low-

pass filter configurations".

BDUb

Block data update. Default value: 0 (0: continuous update;

1:output registers not updated until MSB and LSB have been read)

SIM

SPI Serial Interface Mode selection. Default value: 0(0: 4-wire interface; 1: 3-wire

interface)

Table 19: Output data rate bit configurations

ODR2

ODR1

ODR0

Pressure (Hz)

Temperature (Hz)

Power down / One shot mode enabled

1 Hz

10 Hz

25 Hz

50 Hz

75 Hz

When ODR bits are set to '000' the device is in Power down mode. When the device is in

power-down mode, almost all internal blocks of the device are switched off to minimize

power consumption. I2C interface is still active to allow communication with the device. The

configuration registers content is preserved and output data registers are not updated,

therefore keeping the last data sampled in memory before going into power- down mode.

If ONE_SHOT bit in CTRL_REG2(11h) is set to '1', One-shot mode is triggered and a new

acquisition starts when it is required. This enabling is effective only if the device was

previously in power-down mode (ODR bits set to '000'). Once the acquisition is completed

and the output registers updated, the device automatically enters in power down mode.

ONE_SHOT bit self-clears itself.

When ODR bits are set to a value different than '000', the device is in Continuous mode

and automatically acquires a set of data (pressure and temperature) at the frequency

selected through ODR[2,0] bits.

a This bit must be set to ‘0’ for proper operation of the device

b To guarantee the correct behavior of BDU feature, th PRESS_OUT_H (2Ah) must be the last address read.

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