LTC4215CUFD datasheet(18/24 Pages) LINER

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LTC4215

4215fb

APPLICATIO S I FOR ATIO

same seven bit address with the R/

⎯W bit now set to one.

The LTC4215 acknowledges and send the contents of the

requested register. The transmission is ended when the

master 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.

Alert Response Protocol

When any of the fault bits in FAULT register D are set, an

optional bus alert is generated if the appropriate bit in the

ALERT register B is also set. If an alert is enabled, the cor-

responding fault causes the

⎯A⎯L⎯E⎯R⎯T pin to pull low. After

the bus master controller broadcasts the Alert Response

Address, the LTC4215 responds with its address on the

SDA line and then release

⎯A⎯L⎯E⎯R⎯T as shown in Figure 11.

The

⎯A⎯L⎯E⎯R⎯T line is also released if the device is addressed

by the bus master. The

⎯A⎯L⎯E⎯R⎯T signal is not pulled low

again until the FAULT register indicates a different fault

has occurred or the original fault is cleared and it occurs

again. Note that this means repeated or continuing faults

do not generate alerts until the associated FAULT register

bit has been cleared.

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

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

ADDRESS

1 0 a4:a0

1 0

COMMAND

ADDRESS

R A

b7:b0 1

DATA

X X X X X b2:b0

4215 F10

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

ALERT

RESPONSE

ADDRESS

0 0 0 1 1 0 0

DEVICE

ADDRESS

1 0 a4:a0 0

4215 F11

A P

Figure 7. LTC4215 Serial Bus SDA Write Byte Protocol

Figure 8. LTC4215 Serial Bus SDA Write Word Protocol

Figure 9. LTC4215 Serial Bus SDA Read Byte Protocol

Figure 10. LTC4215 Serial Bus SDA Read Word Protocol

Figure 11. LTC4215 Serial Bus SDA Alert Response Protocol

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