LSM330 datasheet(34/75 Pages) STMICROELECTRONICS

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Digital interfaces

LSM330

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DocID023426 Rev 3

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 order to read multiple bytes, it is necessary to assert the most significant bit of the sub-

address field. In other words, SUB(7) must be equal to 1 while SUB(6-0) represents the

address of first register to be read.

In the communication format presented, MAK is Master Acknowledge and NMAK is No

Master Acknowledge.

Default address:

The SDO/SA0 pins (SDO_A / SDO_G) can be used to modify the least significant bits of the

device address.The linear acceleration sensor slave address is 00111xxb whereas the xx

bits are modified by the SDO_A pin. If the SDO/A pin is connected to the supply voltage, the

address is 0011101b, otherwise if the SDO/A pin is connected to ground, the address is

0011110b.This solution allows to connect and address two different accelerometers to the

same I2C line.

The angular rate sensor slave address is 110101xb, whereas the x bit is modified by the

SDO/G bit. If the SDO_G pin is connected to the supply voltage, LSb is ‘1’ (address

1101011b), otherwise, if the SDO_G pin is connected to ground, the LSb value is ‘0’

(address 1101010b).

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

repeated START (SR) condition will have to 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 15 and

Table 16 explain how the SAD+Read/Write bit pattern is composed, listing all the possible

configurations.

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

00111xxb.

Angular rate sensor: the default (factory) 7-bit slave address is 110101xb.

Table 15. Linear acceleration SAD+Read/Write patterns

Command

SAD[6:2]

SAD[1] = SDO_A

SAD[0] = SDO_A

R/W

SAD+R/W

Read

00111

00111101 (3Dh)

Write

00111

00111100 (3Ch)

Read

00111

00111011 (3Bh)

Write

00111

00111010 (3Ah)

Table 16. Angular rate SAD+Read/Write patterns

Command

SAD[6:1]

SAD[0] = SDO_G

R/W

SAD+R/W

Read

110101

11010101 (D5h)

Write

110101

11010100 (D4h)

Read

110101

11010111 (D7h)

Write

110101

11010110 (D6h)

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