ISL68137_16 Datasheet, PDF (23/53 Pages) Intersil Corporation – Digital Dual Output, 7-Phase Configurable PWM

ISL68137
PMBus Protocol
1. Send Byte Protocol
7+1
1
8
1
S Slave Address_0 A Command Code A
8
PEC
11
AP
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
Example command: 03h Clear Faults
(This will clear all of the bits in Status Byte for the selected Rail)
S: Start Condition
A: Acknowledge (“0”)
N: Not Acknowledge (“1”)
W: Write (“0”)
RS: Repeated Start Condition
R: Read (“1”)
PEC: Packet Error Checking
P: Stop Condition
Acknowledge or DATA from Slave,
ISL68137 Controller
2. Write Byte/Word Protocol
Not Used for One Byte Word
1
7+1
1
8
1
8
1
8
1
S Slave Address_0 A Command Code
A
Low Data Byte
A High Data Byte A
8
PEC
11
AP
Example command: 21h VOUT_COMMAND
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
3. Read Byte/Word Protocol
1
7+1
1
8
1
S Slave Address_0 A Command Code A
1
7+1
1
8
RS Slave Address_1 A Low Data Byte
Not Used for One Byte Word Read
1
8
1
A High Data Byte A
8
PEC
11
NP
Example command: 8B READ_VOUT (Two words, read voltage of the selected rail).
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
STOP (P) bit is NOT allowed before the repeated START condition when “reading” contents of a register.
4. Group Command Protocol - No more than one command can be sent to the same Address
1
7+1
1
8
1
8
1
8
1
S Slave ADDR1_0
A Command Code A Low Data Byte
A High Data Byte
A
1
7+1
1
8
1
8
1
8
1
S
Slave ADDR2_0
A Command Code A
Data Byte
A
PEC
A
1
7+1
1
8
RS
Slave ADDR3_0
A Command Code A
8
1
8
1
Low Data Byte A High Data Byte A
8
PEC
8
PEC
1
A
11
AP
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
5. Alert Response Address (ARA, 0001_1001, 25h) for SMBus and PMBus, not used for I²C
1
7+1
S ALERT Addr_1
1
7+1
1
A Slave_Address_1 A
8
PEC
11
AP
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
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FN8757.0
September 27, 2016