LTC4215CUFD datasheet(20/28 Pages) LINER

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LTC4215/LTC4215-2

4215fe

APPLICATIONS INFORMATION

ADDRESS

1 0 a4:a0

4215 F07

FROM MASTER TO SLAVE

FROM SLAVE TO MASTER

A: ACKNOWLEDGE (LOW)

A: NOT ACKNOWLEDGE (HIGH)

R: READ BIT (HIGH)

W: WRITE BIT (LOW)

S: START CONDITION

P: STOP CONDITION

COMMAND

DATA

X X X X X b2:b0

b7:b0

Figure 7. LTC4215 Serial Bus SDA Write Byte Protocol

ADDRESS

1 0 a4:a0

COMMAND

DATA

X X X X X b2:b0

4215 F08

X X X X X X X X

b7:b0

Figure 8. LTC4215 Serial Bus SDA Write Word Protocol

ADDRESS

1 0 a4:a0

1 0

COMMAND

ADDRESS

R A

b7:b0 1

DATA

X X X X X b2:b0

4215 F10

A P

Figure 9. LTC4215 Serial Bus SDA Read Byte Protocol

ADDRESS

1 0 a4:a0

1 0

COMMAND

ADDRESS

R A

b7:b0

DATA

X X X X X b2:b0

4215 F11

b7:b0

DATA

A P

Figure 10. LTC4215 Serial Bus SDA Read Word Protocol

ALERT

RESPONSE

ADDRESS

0 0 0 1 1 0 0

DEVICE

ADDRESS

1 0 a4:a0 0

4215 F11

A P

Figure 11. LTC4215 Serial Bus SDA Alert Response Protocol

The transmission is ended when the master sends a STOP

condition. If the master continues sending a second data

byte, as in a Write Word command, the second data byte

is acknowledged by the LTC4215 but ignored, as shown

in Figure 8.

Read Protocol

The master begins a read operation with a START condition

followed by the seven bit slave address and the R/W bit

set to zero, as shown in Figure 9. The addressed LTC4215

acknowledges this and then the master sends a command

byte which indicates which internal register the master

wishes to read. The LTC4215 acknowledges this and then

latches the lower three bits of the command byte into its

internal Register Address pointer. The master then sends

a repeated START condition followed by the same seven

bit address with the R/W bit now set to one. The LTC4215

acknowledges and send the contents of the requested

sends a STOP condition. If the master acknowledges

the transmitted data byte, as in a Read Word command,

Figure 10, the LTC4215 repeats the requested register as

the second data byte.

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