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7.3

CTRL_REG1 (20h)

Control register 1

The PD bit is used to turn on the device. The device is in power-down mode when PD = ‘0’

(default value after boot). The device is active when PD is set to ‘1’.

The BDU bit is used to inhibit the output register update between the reading of the upper

and lower register parts. In default mode (BDU = ‘0’), the lower and upper register parts are

updated continuously. If it is not certain whether the read will be faster than output data rate,

it is recommended to set the BDU bit to ‘1’. In this way, after the reading of the lower (upper)

read also.

This feature prevents the reading of LSB and MSB related to different samples.

The ODR1 and ODR0 bits permit changes to the output data rates of humidity and

temperature samples.The default value corresponds to a “one-shot” configuration for both

humidity and temperature output. ODR1 and ODR0 can be configured as described in

Table 17.

76543210

Reserved

BDU

ODR1

ODR0

[7]

PD: power-down control

(0: power-down mode; 1: active mode)

[6:3]

Reserved

[2]

BDU: block data update

(0: continuous update; 1: output registers not updated until MSB and LSB reading)

[1:0]

ODR1, ODR0: output data rate selection (see table 17)

Table 17. Output data rate configuration

ODR1

ODR0

Humidity (Hz)

Temperature (Hz)

One-shot

1 Hz

7 Hz

12.5 Hz

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