AN2038 datasheet(13/23 Pages) STMICROELECTRONICS

13 / 23 page

AN2038

Command frames

13/23

Figure 10.

Communication frame (Response from Slave)

Motor Status Byte

MS: Motor Stalled

SF: Startup Fails

OT: Over Temperature

OV: Over Voltage

OC: Over Current

Table 4.

I2C Code table

COMMUNICATION CODE

STX

0x02

Start Transmission

ETX

0x03

End Transmission

ACK

0x1c

Acknowledge

NOT_ACK

0xee

Not Acknowledge

NOT_READY

0xcc

Not Ready

WAIT

0xfc

Wait

MASTER COMMANDS

CMD_SETSPEED

0x77

Command set speed. D2 and D3 will be respectively

MSB and LSB of a word contains speed in rpm.

CMD_BRAKE

0x88

Command brake

CMD_START

0x66

Command start motor

MASTER QUERY

ASK_STATUS

0x08

Master asks for motor status. D1 and D2 of subsequent

answer of the slave is a byte formatted as below. D2 is

a checksum byte equal to complemented bit respect

ASK_SPEED

0x07

Master asks for motor speed. D1, D2, D3, D4 of

subsequent answer of the slave is respectively MSB

and LSB of a word contains speed in rpm. D3 and D4

is two checksum byte equal to complemented bit

respect D1 and D2

Slave addr. + r

STX

Length = n

…

CRC1

CRC2

ETX

ANSWER FROM SLAVE

From Slave

From Master

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