AN4504 datasheet(9/41 Pages) STMICROELECTRONICS

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AN4504

Operating modes

Table 4 shows the typical values of power consumption for the different operating modes.

Power consumption in normal mode is independent of the selected ODR.

2.1

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. Digital interfaces (I2C and SPI) are still active

to allow communication with the device. The content of the configuration registers is

preserved and output data registers are not updated, therefore keeping the last data

sampled in memory before going into power-down mode.

2.2

Sleep mode

While the device is in sleep mode the driving circuitry making the moving mass of the

gyroscope oscillating is kept active. Turn-on time from sleep mode to normal mode is

drastically reduced.

2.3

Normal mode

In normal mode, data are generated at the data rate (ODR) selected through the DR bits.

Data interrupt generation is active and configured through the INT1_CFG register.

2.4

Delay to switch modes

The delay in order to switch modes is shown in Table 5.

Table 4. Power consumption

Operating mode

Power consumption

Power-down

5 μA

Sleep

1.5 mA

Normal

6.1 mA

Table 5. Turn-on time

Starting mode

Target mode

Turn-on time - typ

Power-down

Normal

250 ms

Power-down

Self test

250 ms

Sleep

Normal

1/ODR: LPF2 disabled

6/ODR: LPF2 enabled

Normal

Sleep

immediate

Normal

Power-down

immediate

Other settings change

1/ODR: LPF2 disabled

6/ODR: LPF2 enabled

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