MMA8451Q_12 datasheet(18/52 Pages) FREESCALE

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MMA8451Q

Sensors

Freescale Semiconductor, Inc.

complete, the Master transmits a stop condition (SP) to the data transfer. The data sent to the MMA8451Q is now stored in the

appropriate register.

Multiple Byte Write

The MMA8451Q automatically increments the received register address commands after a write command is received.

Therefore, after following the steps of a single byte write, multiple bytes of data can be written to sequential registers after each

MMA8451Q acknowledgment (ACK) is received.

Figure 11. I2C Timing Diagram

Table 11. I2C Device Address Sequence

Command

[6:1]

Device Address

[0]

SA0

[6:0]

Device Address

R/W

8-bit Final Value

Read

001110

0x1C

0x39

Write

001110

0x1C

0x38

Read

001110

0x1D

0x3B

Write

001110

0x1D

0x3A

< Single Byte Read >

Master

Device Address[6:0]

NAK SP

Slave

Data[7:0]

< Multiple Byte Read >

Master

Device Address[6:0]

SR Device Address[6:0]

Slave

Data[7:0]

Master

NAK

Slave

Data[7:0]

< Single Byte Write >

Master

Device Address[6:0]

Data[7:0]

Slave

< Multiple Byte Write >

Master

Device Address[6:0]

Data[7:0]

Slave

Legend

ST: Start Condition

SP: Stop Condition

NAK: No Acknowledge

W: Write = 0

SR: Repeated Start Condition

AK: Acknowledge

R: Read = 1

MMA8451Q Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

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