LSM330D datasheet(34/66 Pages) STMICROELECTRONICS

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Digital interfaces

LSM330D

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Doc ID 022562 Rev 2

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

data line. If a slave receiver does not 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 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 pin (SDO_A / SDO_G) can be used to modify the least significant bit of the

device address. If the SA0 pad is connected to voltage supply, the LSb is ‘1’ (ex. address

0011001b), otherwise if the SA0 pad is connected to ground, the LSb value is ‘0’ (ex

address 0011000b).

The slave address is 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 16 and 17

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

configurations.

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

001100xb.

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

Table 16.

Linear acceleration SAD+Read/Write patterns

Command

SAD[6:1]

SAD[0] = SDO_A pin

R/W

SAD+R/W

Read

001100

00110001 (31h)

Write

001100

00110000 (30h)

Read

001100

00110011 (33h)

Write

001100

00110010 (32h)

Table 17.

Angular rate SAD+Read/Write patterns

Command

SAD[6:1]

SAD[0] = SDO_G pin

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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