LSM303DLH datasheet(21/47 Pages) STMICROELECTRONICS

21 / 47 page

LSM303DLH

Application hints

Doc ID 16941 Rev 1

21/47

6.1

External capacitors

The C1 and C2 external capacitors should have a low SR value ceramic type construction.

Reservoir capacitor C1 is nominally 4.7 µF in capacitance, with the set/reset capacitor C2

nominally 0.22 µF in capacitance.

The device core is supplied through the Vdd line. Power supply decoupling capacitors

(C4=100

nF ceramic, C3=10 µF Al) should be placed as near as possible to the supply pin

of the device (common design practice). All the voltage and ground supplies must be

present at the same time to obtain proper behavior of the IC (refer to

Figure 4).

The functionality of the device and the measured acceleration/magnetic field data is

selectable and accessible through the I2C interface.

The functions, the threshold and the timing of the two interrupt pins (INT 1 and INT 2) can be

completely programmed by the user through the I2C interface.

6.2

Pull-up resistors

Pull-up resistors are placed on the two I2C bus lines.

6.3

Digital interface power supply

This digital interface dedicated to the linear acceleration signal is capable of operating with a

standard power supply (Vdd) or using a dedicated power supply (Vdd_IO_A).

This digital interface dedicated to the magnetic field signal requires a dedicated power

supply (Vdd_dig_M).

The table below shows the modes available in the various power supply conditions.

6.4

Soldering information

The LGA package is compliant with the ECOPACK®, RoHS and “Green” standard.

It is qualified for soldering heat resistance according to JEDEC J-STD-020.

Leave “pin 1 Indicator” unconnected during soldering.

Land pattern and soldering recommendations are available at www.st.com/

Table 8.

Operational mode and power supply for magnetic field sensing

Vdd_dig_M

Vdd

Mode

supported

Description

High

All

except off

Digital I/O pins: range from GND to Vdd_I2C_bus /

Vdd_dig_M.

Device fully functional. Digital logic blocks are powered

from Vdd_dig_M supply, including all onboard clocks.

High

Low

Power down

Digital I/O pins: range from GND to Vdd_I2C_bus /

Vdd_dig_M.

Device measurement functionality not supported.

Device I2C bus and register access supported.

LSM303DLH 数据表(PDF) 21 Page - STMicroelectronics

LSM303DLH 数据表(HTML) 21 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

数据表下载