ISL6398 Datasheet, PDF (36/57 Pages) Intersil Corporation – Programmable soft-start rate and DVID rate

ISL6398
1. Send Byte Protocol
1
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,
ISL6398
2. Write Byte/Word Protocol
1
7+1
S Slave Address_0
1
8
A Command Code
1
8
A Low Data Byte
Not Used for One Byte Word
1
8
1
A High Data Byte
A
8
PEC
11
AP
Example command: DAh SET_VID (one word, High Data Byte and ACK are not used)
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
3. Read Byte/Word Protocol
1
7+1
S Slave Address_0
1
8
A Command Code
1
7+1
RS Slave Address_1
1
A
1
8
A Low Data Byte
Not Used for One Byte Word Read
1
8
1
A High Data Byte
A
8
PEC
11
NP
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
Example command: 8B READ_VOUT (Two words, read voltage of the selected rail).
NOTE: All Writable commands are read with one byte word protocol.
STOP (P) bit is NOT allowed before the repeated START condition when “reading” contents of a register.
4. Block Write Protocol
1
7+1
1
8
1
8
1
8
1
8
1
S Slave Address_0
A Command Code
A Byte Count = N
A Lowest Data Byte
A Data Byte 2
A
1
8
1
A Data Byte N
A
8
PEC
11
AP
Optional 9 Bits for SMBus/PMBus
NOT used in I²C
Example command: 9Dh MFR_DATA (3 Data Byte)
FIGURE 35. SMBus/PMBus/I²C PROTOCOL
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FN8575.1
August 13, 2015