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NCP81022MNTXG

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NCP81022
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Offset Trim
Within the SVI2 protocol the NCP81022 controller has the ability to manipulate the offset of both the VDD and VDDNB
rails independently of each other, when Enable and PWROK are asserted. Descriptions of offset codes are described below.
Offset Trim [1:0] Description
00 0 offset
01 Initial offset −25 mV
10 Use initial offset (default)
11 Initial offset +25 mV
SVT Serial Packet
The NCP81022 has the ability to sample and report voltage and current for both the VDD and VDDNB domain. This
information is reported serially over the SVT line which is clocked using the processor driven SVC line. When the PWROK
is deasserted, the NCP81022 is not collecting or reporting telemetry information. When PWROK is asserted, the telemetry
information reported back is as described below. If the NCP81022 is configured in voltage only telemetry then the sampled
voltage for VDD and the sampled voltage for the VDDNB are sent together in every SVT telemetry packet.
Parameter Value Unit
Number of voltage Bits 9 Bits
Maximum reporting Voltage 3.15 V
Minimum reported Voltage 0.00 V
Voltage resolution 6.25 mV
Voltage accuracy from 1.2 V to 800 mV ±1 LSB
Voltage accuracy for voltages greater than 1.2 V and less than 800 mV ±2 LSB
Recommended voltage moving average window size 50
ms
Minimum voltage only telemetry reporting rate 20 kHz
Number of bits in current data 8 Bits
Max reported current (FFh = OCP) 100 % of IDD spike _ocp
Max reported current (00h) 0 % of IDD spike _ocp
If the NCP81022 is configured in voltage and current mode then the samples voltage and current information for VDD is
sent out in one SVT telemetry packet while the voltage and current information for the VDDNB domain is sent out in the next
SVT telemetry packet. The telemetry report rate while the NCP81022 is in current and voltage mode, is double that which is
observed in voltage only mode. The reported voltage and current are moving average representations.
Bit Description Bit
0 SVT0
See table below for
description
10 Voltage Bit 0
1 SVT1 11 Voltage Bit 8 ‘0’ in V and I mode
2 Voltage Bit 8 12 Voltage or current Bit 7
3 Voltage Bit 7 13 Voltage or current Bit 6
4 Voltage Bit 6 14 Voltage or current Bit 5
5 Voltage Bit 5 15 Voltage or current Bit 4
6 Voltage Bit 4 16 Voltage or current Bit 3
7 Voltage Bit 3 17 Voltage or current Bit 2
8 Voltage Bit 2 18 Voltage or current Bit 1
9 Voltage Bit 1 19 Voltage or current Bit 0
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SVT0, SVT1
Description
0,0 Telemetry packet belongs to the VDD domain and in V&I mode.
0,1 Telemetry packet belongs to the VDDNB domain and in V&I mode.
1,0 VOTF Complete, a stop immediately follows these two bits during the next SVC high period. Telemetry data does
not follow this bit configuration
1,1 Telemetry package in voltage representation only. (default)
SVI2 VR to Processor Data Communication
As described previously the NCP81022 has the ability to send digitally encoded voltage and current values for the VDD and
VDDNB domains to the processor, it also has the capability to send VID On The Fly (VOTF) complete mechanism. The
processor uses this information as an indicator for when the VDD, VDDNB are independently, or collectively, at the requested
stepped−up VID voltage. The VOTF complete mechanism is not used for VID changes to lower or for repeated VID codes.
VOTF Complete is transmitted as an SVT packet. Since a VOTF request could apply to one or two voltage domains, rules
are suggested below to handle these cases.
VID Change Offset Change Loadline Change VOFT Timing Force or Decay Change
UP Unchanged Unchanged After slewing Force voltage change
Down Unchanged Unchanged NO VOTF Voltage Decay
X UP Unchanged After slewing Force voltage change
X Down Unchanged After slewing Force voltage change
X Unchanged Up After slewing Force voltage change
X Unchanged Down After slewing Force voltage change
Figure 5. Slew Rate Timing
SVC
SVD
SVT
STOP
VDD or
VDDNB
Slew Rate Measured here
VID − RLL * IOUT +−OFFSET − TOB
Tsc
*Max Tsc =5 ms
• Telemetry takes priority over VOTF Complete signals
• VOTF complete can be sent if the net voltage change is 0 or negative
• VOTF Complete is only used to indicate that a rail(s) has finish slewing to a higher voltage.
• If a VOTF request for a higher voltage is sent for both VDD and VDDNB rails, but only domain will go up in voltage
then the returned VOTF Complete will indicate that the increasing domain has finished slewing
• If the processor starts a VOTF request but the VOTF is incomplete then the NCP81022 will not sent the VOTF
Complete sequence until after the new VOTF request.
NCP81022
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• If the processor is sending a SVD packet when the NCP81022 is sending telemetry packet to send, then the NCP81022
waits to send the telemetry until after the SVD packet has stopped transmitting.
• If the processor stops sending the SVD packet while the NCP81022 is sending telemetry then no action has to be taken,
the NCP81022 shifts in the new SVD packet and finishes sending the telemetry while the processor is sending the SVD
packet.
• SVT packets are not sent while PWROK is deasserted
• The NCP81022 will not collect or send telemetry data when telemetry functionality is disabled by the TFN bits
The following timing diagrams cover the SVC, SVD and SVT timing when PWROK is asserted and data is being transmitted,
the table that follows defines the min and max value for each timing specification.
TSTA RT
THigh
TLow
TPeriod
THold
TQuiet
TSetup
THold
TQuiet
TZack
TSetup
TStop
TSetup
THold
SVC
SVD
HiZ
HiZ
SVC
SVD
Figure 6. SDV SVC Timing
SVC
SVT
T
setup
T
stop
Figure 7. SVT Stop Timing
SVC
SVD/SVT
TReStart
Figure 8. SVD or SVT Re−Start Timing
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NCP81022MNTXG

Mfr. #:
Buy NCP81022MNTXG
Manufacturer:
ON Semiconductor
Description:
Gate Drivers AMD VR CONTROLLER
Lifecycle:
New from this manufacturer.
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