ISL68134_16 Datasheet, PDF (46/50 Pages) Intersil Corporation – Digital Dual Output, 7-Phase Configurable PWM

ISL68134
Adaptive Voltage Scaling (AVSBus) Functionality and Operation
The AVSBus interface provides a high speed (up to 50MHz) serial interface to the ISL68134 allowing implementation of advanced
voltage scaling functions supporting increased system efficiency and performance. Devices equipped with AVSBus master capability
may use the interface to enable rapid supply voltage changes to support low power consumption modes as well as high performance
modes. Due to the advanced digital regulation loop employed, the ISL68134 is well equipped to support very rapid transition rates. All
commands are readable at all times, but they cannot be written to unless the device is set to AVSBus control.
AVSBus Master Send Subframe
FUNCTION Start Code
R/W
SIZE (bits)
2
2
01b
00b = Write data
and Commit
11b = Read Data
SETTING
Command Type
Command Code
1
4
0b = AVSBus Data 0h = Target Rail Voltage
1h = Transition Rate
2h = Rail Current
3h = Temperature
4h = Voltage Reset
Eh = AVSBus Status
Fh = AVSBus Version
Rail Select
4
0h = Rail 0
1h = Rail 1
Fh = Broadcast
Command Data CRC
16
3
Read = FFh
Write = See “AVSBus
Command Detail”
Section
AVSBus Slave Response Subframe
FUNCTION
Slave Ack
0b
Status Response
Command Data Not Used CRC
SIZE (bits)
2
1
5
16
5
3
SETTING
00b = Command acknowledged, 0b
Action Taken
01b = Command acknowledged,
No action
10b = Bad CRC, No Action
11b = Invalid Request, No Action
Bit 5 = V_DONE. Sets to 1 when V_OUT target is reached Write = FFh
Bit 4 = Status Alert. Sets to 1 if a bit in AVSBus Status Read = See
register (excluding from V_DONE) has set
“AVSBus
Bit 3 = AVSBus Control. Sets to 1 when AVSBus control Command Detail”
is enabled
Section
Bits 2:0 = Not used
Not used
11111b
AVSBus Command Detail
TARGET RAIL VOLTAGE (0h)
Definition: Set or read the target rail voltage set point. 1mV per LSB. The initial set point is copied from the PMBus™ command
VOUT_COMMAND when AVSBus operation is selected.
Paged or Global: Paged
Data Length in Bytes: 2
Data Format: Direct
Type: R/W
Default Value: Value of PMBus VOUT_COMMAND
Units: mV
Equation: TARGET RAIL VOLTAGE = (Direct value)
Range: Limited to the values of VOUT_MIN and VOUT_MAX PMBus commands
COMMAND
TARGET RAIL VOLTAGE (0h)
Format
Direct
Bit Position
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Access
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Function
Two’s Complement Integer
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FN8817.0
September 28, 2016