LSM303AH Datasheet, PDF (22/82 Pages) –

Functionality
LSM303AH
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).
Table 12. Operating mode and turn-on time
Operating mode
Turn-on time
CFG_REG_A_M[LP]
0 (high-resolution)
1 (low-power)
CFG_REG_A_M[OFF_CANC = 0] CFG_REG_A_M[OFF_CANC = 1]
9.4 ms
6.4 ms
9.4 ms + 1/ODR
6.4 ms + 1/ODR
The LSM303AH 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 LSM303AH 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.
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’)
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.
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