ISM303DAC datasheet(23/80 Pages) STMICROELECTRONICS

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ISM303DAC

Functionality

The following table summarizes the turn-on time of the magnetometer in the two different

power modes with the offset cancellation function enabled or disabled (see Section 4.1.2:

Magnetometer offset cancellation).

The ISM303DAC offers single measurement mode in both high-resolution and low-power

modes.

Single measurement mode is enabled by writing bits MD[1:0] to '01' in CFG_REG_A_M

(60h).

In single measurement mode, once the measurement has been performed, the DRDY pin is

set to high, data is available in the output register and the ISM303DAC is automatically

configured in idle mode by setting the MD[1] bit to '1'.

Single measurement is independent of the programmed ODR but depends on the frequency

at which the MD[1:0] bits are written by the microcontroller/application processor.

Maximum ODR frequency achievable in single mode measurement is given in the following

table.

In single measurement mode, for ODR < 10 Hz, current consumption can be calculated with

the following formula:

(Current_consumption_10Hz - Current_consumption_in_power_down) / (10 Hz / ODR) +

Current_consumption_in_power_down

Where Current_consumption_in_power_down and Current_consumption_10Hz can be

found, respectively, in Table 5 and Table 11.

Table 12. Operating mode and turn-on time

Operating mode

Turn-on time

CFG_REG_A_M[LP]

CFG_REG_A_M[OFF_CANC = 0]

CFG_REG_A_M[OFF_CANC = 1]

0 (high-resolution)

9.4 ms

9.4 ms + 1/ODR

1 (low-power)

6.4 ms

6.4 ms + 1/ODR

Table 13. Maximum ODR in single measurement mode (HR and LP modes)

Maximum ODR

Power mode (CFG_REG_A_M[LP])

100 Hz

High resolution (LP = ‘0’)

150 Hz

Low power (LP = ‘1’)

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