LSM303C datasheet(26/53 Pages) STMICROELECTRONICS

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Digital interfaces

LSM303C

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DocID024975 Rev 2

(MSb) first. If a receiver can’t receive another complete byte of data until it has performed

some other function, it can hold the clock line SCL LOW to force the transmitter into a wait

state. Data transfer only continues when the receiver is ready for another byte and releases

the data line. If a slave receiver doesn’t acknowledge the slave address (i.e. it is not able to

receive because it is performing some real-time function) the data line must be left HIGH by

the slave. The master can then abort the transfer. A LOW-to-HIGH transition on the SDA

line while the SCL line is HIGH is defined as a STOP condition. Each data transfer must be

terminated by the generation of a STOP (SP) condition.

In the presented communication format MAK is Master acknowledge and NMAK is No

Master Acknowledge.

Default Address:

The accelerometer sensor slave address is 0011101b while magnetic sensor slave address

is 0011110b.

The slave addresses are completed with a Read/Write bit. If the bit was ‘1’ (Read), a

repeated START (SR) condition must be issued after the two sub-address bytes. If the bit is

‘0’ (Write) the master will transmit to the slave with direction unchanged. Table 16 and

Table 17 explain how the SAD+Read/Write bit pattern are composed, listing all the possible

configurations.

Linear acceleration sensor: the default (factory setting) 7-bit slave address is

0011101b.

Table 16. SAD + Read/Write patterns

Magnetic field sensor: the default (factory setting) 7-bit slave address is 0011110b.

Table 17. SAD + Read/Write patterns

6.2

SPI bus interface

The LSM303C SPI is a bus slave. The SPI allows writing and reading the registers of the

device.

The serial interface interacts with the outside world with 3 wires: CS_XL, CS_MAG, SPC,

SDI.

3-wire mode is entered by setting the CTRL_REG4_A (SIM) and CTRL_REG3_M (SIM) bit

equal to ‘1’ (SPI serial interface mode selection).

Command

SAD[6:0]

R/W

SAD + R/W

Read

0011101

00111011 (3Bh)

Write

0011101

00111010 (3Ah)

Command

SAD[6:0]

R/W

SAD + R/W

Read

001110

00111101 (3Dh)

Write

001110

00111100 (3Ch)

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