LSM303DLM compass
First generation digital compass:
LSM303DLH
Key features
3-axis accelerometer: from ±2 to ±8 g
3-axis magnetic sensor: up to 8.1 gauss
Independent sensing power management
LSM303DLH
Independent sensing power management
Magnetic resolution: 8 mgauss
I²C interface
Package: LGA-28, 5.0 x 5.0 x 1.0 mm³
New generation digital compass:
LSM303DLM
Key features
3-axis accelerometer: from ±2 to ±8 g
3-axis magnetic sensor: up to 8.1 gauss
Low power consumption
Independent sensing power
LSM303DLM
Independent sensing power
management
Magnetic resolution: 5 mgauss
I²C interface
Package: LGA-28, 5.0 x 5.0 x 1.0 mm³
The benefits of using LSM303DLM
The LSM303DLM replaces the LSM303DLH compass and introduces
additional improvements:
50% less power consumption
30% increase in magnetic resolution
No need for a dedicated digital supply voltage for magnetic digital core
All this in a package which has the same size and is pin-to-pin
compatible with the previous generation compass
Magnetic characteristics comparison
Parameter * LSM303DLH LSM303DLM
Magnetic measurement range 1.3 to 8.1 gauss 1.3 to 8.1 gauss
Magnetic sensitivity – X,Y axis 0.9 to 4.3 mgauss/digit 0.9 to 4.3 mgauss/digit
Magnetic sensitivity – Z axis 1 to 4.8 mgauss/digit 1 to 4.8 mgauss/digit
Magnetic resolution 8 mgauss 5 mgauss
* Refer to product datasheet for test conditions
Electrical characteristics comparison
Parameter * LSM303DLH LSM303DLM
Supply voltage (Vdd) 2.5 to 3.3 V 2.16 to 3.6 V
Dedicated magnetic digital power supply 1.71 to 2.0 V Not needed
Current consumption 830 µA 360 µA
Operating temperature range -30 to 85 °C -40 to 85 °C
* Refer to product datasheet for test conditions
Application hints comparison
LSM303DLH LSM303DLM
No need for a dedicated digital supply voltage for the magnetic digital core
In LSM303DLM, pins 5 and 21 are not internally connected
I²C serial interface
The registers embedded inside the LSM303DLH and LSM303DLM
are accessible through two separate I²C serial interfaces, one for
the accelerometer core and the other for the magnetometer core
Device Magnetic sensor
I²C address Linear acceleration sensor
I²C address
LSM303DLH 0011110b If the SA0 = 1, address: 0011001b
If the SA0
= 0,
address
:
0011000b
If the SA0
= 0,
address
:
0011000b
LSM303DLM 0011110b If the SA0 = 1, address: 0011001b
If the SA0 = 0, address: 0011000b
Magnetic field sensing register
comparison
LSM303DLH LSM303DLM
220 Hz output data rate is available
Magnetic field sensing register
comparison
Minor differences in gain values between the two versions
LSM303DLH LSM303DLM
LSM303DLH LSM303DLM
Magnetic field sensing register
comparison
Y – Z axes have different addresses in LSM303DLH and LSM303DLM
Magnetic field sensing register
comparison
SR_REG_M (09h) and IR_REG_M (0Ah/0Bh/0Ch) registers provide
the same information in both LSM303DLH and LSM303DLM
LSM303DLH/LSM303DLM ID procedure
LSM303DLH
LSM303DLM
LSM303DLH
LSM303DLM
MEMS compasses
For more information, visit
www.st.com/mems
