APW8871 Datasheet, PDF (20/27 Pages) Anpec Electronics Coropration – DDR4 TOTAL POWER SOLUTION (VPP/VDDQ/VTT) SYNCHRONOUS DC/DC CONVERTER for NB/MB

APW8871
The device slave address is defined as “00101010” (2AH) for APW8871.
Register
Address
01
Description
VDDQ Switching Frequency setting
Read/Write
Read/Write
02
VDDQ Initial Voltage setting
Read/Write
03
VDDQ DAC Voltage adjustable
Read/Write
04
VDDQ Voltage Slew Rate
Read/Write
The below tables define the operation of each register bit. Default values are in bold text.
Power On Default
Value
00h
02h
00h
00h
REGISTER Address:01h
Bit
Name
[7:3]
Reserve
[2:0]
VDDQ FSW
Data
-
000
001
010
011
100
101
Read/Write
-
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Description
No Used
VDDQ FSW = 400KHz at PWM mode.
VDDQ FSW = 600KHz at PWM mode.
V_DDQ F_SW = 800KHz at PWM mode.
VDDQ FSW = 1000KHz at PWM mode.
V_DDQ F_SW = 1200KHz at PWM mode.
V_DDQ F_SW = 1400KHz at PWM mode.
REGISTER Address:02h
Bit
Name
[7:2]
Reserve
[1:0]
VDDQ Initial Voltage
Data
-
00
01
10
11
Read/Write
-
Read/Write
Read/Write
Read/Write
Read/Write
Description
No Used
VDDQ Voltage = 1.0V.
VDDQ Voltage = 1.1V.
V_DDQ Voltage = 1.2V.
VDDQ Voltage = 0V.
REGISTER Address:03h
Bit
Name
[7:6]
Reserved
[5:0] VDDQ DAC
Data
-
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
C opyright © ANPEC Electronics C orp.
Rev. A.1 - Sep., 2015
Read/Write
-
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
20
Description
No Used
VDAC Voltage = 0mV
VDAC Voltage = 10mV
VDAC Voltage = 20mV
VDAC Voltage = 30mV
VDAC Voltage = 40mV
VDAC Voltage = 50mV
VDAC Voltage = 60mV
VDAC Voltage = 70mV
VDAC Voltage = 80mV
VDAC Voltage = 90mV
VDAC Voltage = 100mV
VDAC Voltage = 110mV
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