ADM1060 datasheet(39/45 Pages) AD

39 / 45 page

PROGRAMMING ADM1060

ADM1060

– 39 –

REV. PrJ 11/02

PRELIMINARY TECHNICAL DATA

If the operation is a write operation, the first data byte

after the slave address is a command byte. This tells the

slave device what to expect next. It may be an instruc-

tion such as telling the slave device to expect a block

write, or it may simply be a register address that tells

the slave where subsequent data is to be written.

Since data can flow in only one direction as defined by

the R/W bit, it is not possible to send a command to a

slave device during a read operation. Before doing a

read operation, it may first be necessary to do a write

operation to tell the slave what sort of read operation to

expect and/or the address from which data is to be read.

3. When all data bytes have been read or written, stop

conditions are established. In WRITE mode, the master

will pull the data line high during the 10th clock pulse

Figure 8a. General SMBus Write Timing Diagram

Figure 8b. General SMBus Read Timing Diagram

Figure 8c. Diagram for Serial Bus Timing

to assert a STOP condition. In READ mode, the mas-

ter device will release the SDA line during the low

period before the 9th clock pulse, but the slave device

will not pull it low. This is known as No Acknowledge.

The master will then take the data line low during the

low period before the 10th clock pulse, then high dur-

ing the 10th clock pulse to assert a STOP condition.

R/W

SCL

SDA

ACK. BY

SLAVE

START BY

MASTER

FRAME 1

SLAVE

ADDRESS

FRAME 2

COMMAND

CODE

ACK. BY

SLAVE

ACK. BY

SLAVE

STOP

MASTER

FRAME N

DATA

BYTE

SCL

(CONTINUED

)

SDA

(CONTINUED

)

ACK. BY

SLAVE

FRAME 3

DATA BYTE

R/W

SCL

SDA

ACK. BY

MASTER

START BY

MASTER

FRAME 1

SLAVE

ADDRESS

FRAME 2

DATA

BYTE

ACK. BY

SLAVE

NO ACK.

STOP

MASTER

FRAME N

DATA

BYTE

SCL

(CONTINUED

)

SDA

(CONTINUED

)

ACK. BY

MASTER

FRAME 3

DATA BYTE

tHD;ST

tHD;DA

tHIG

tSU;DA

tSU;STA

tSU;ST

tLO

tHD;ST

SCL

SDA

tBUF

ADM1060 Datasheet(PDF) 39 Page - Analog Devices

ADM1060 Datasheet(HTML) 39 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

Datasheet Download

Link URL