ISL68137_16 Datasheet, PDF (48/53 Pages) Intersil Corporation – Digital Dual Output, 7-Phase Configurable PWM

ISL68137
Adaptive Voltage Scaling (AVSBus) Functionality and Operation
The AVSBus interface provides a high speed (up to 50MHz) serial interface to the ISL68137, allowing implementation of advanced
voltage scaling functions that support 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 ISL68137 is well equipped to support very rapid transition rates. All
commands are readable at all times, but they cannot be written unless the device is set to AVSBus control.
AVSBus Master Send Subframe
FUNCTION Start Code R/W
SIZE (bits) 2
2
Command Type
1
Command Code
4
SETTING 01b
00b = Write data
and Commit
11b = Read Data
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” on
page 49
AVSBus Slave Response Subframe
FUNCTION Slave Ack
0b
SIZE (bits) 2
1
SETTING
00b = Command
0b
acknowledged, action taken
01b = Command
acknowledged, no action
10b = Bad CRC, no action
11b = Invalid request, no action
Status Response
Command Data
Not used CRC
5
16
5
3
Bit 5 = VDONE. Sets to 1 when V_OUT
target is reached
Write = FFh
Read = See “AVSBus
Bit 4 = Status alert. Sets to 1 if a bit in Command Detail” on
AVSBus Status register (excluding from page 49
VDONE) has set
Bit 3 = AVSBus control. Sets to 1 when
AVSBus control is enabled
Bits 2:0 = Not used
Not used
11111b
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FN8757.0
September 27, 2016