RT8167A datasheet(3/40 Pages) RICHTEK

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RT8167A

DS8167A-00

January 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Pin No.

Pin Name

Pin Function

GFXPS2

Forced DEM Enable Setting of GFX VR. Connect to VCC for forced-DEM setting

and connect to GND for following SVID power state command.

VCC

5V Power Supply Input of Controller. Bypass this pin to GND with a 1

μF or greater

ceramic capacitor.

SETINIA

Initial Startup Voltage VINI_GFX Setting of GFX VR. Connect to a resistive voltage

divider from VCC to GND to set the pin voltage VSETINIA for GFX VR initial startup

voltage VINI_GFX setting. Connect this pin to GND for 0V VINI_GFX setting.

SETINI

Initial Startup Voltage VINI_CORE Setting of CORE VR. Connect to a resistive

voltage divider from VCC to GND to set the pin voltage VSETINI for CORE VR initial

startup voltage VINI_CORE setting. Connect this pin to GND for 0V VINI_CORE setting.

TMPMAX

Maximum Temperature Setting of CORE VR. Connect to a resistive voltage divider

from VCC to GND to set the pin voltage VTMPMAX for TMPMAX setting.

ICCMAX

Maximum Current Setting of CORE VR. Connect to a resistive voltage divider from

VCC to GND to set the pin voltage VICCMAX for ICCMAX setting.

ICCMAXA

Maximum Current Setting of GFX VR. Connect to a resistive voltage divider from

VCC to GND to set the pin voltage VICCMAXA for ICCMAXA setting.

TSEN

Thermal Monitor Sense Pin of CORE VR.

OCSET

Over Current Protection Setting of CORE VR. Connect to a resistive voltage divider

from VCC to GND to set the pin voltage VOCSET from 0 to 3.3V for CORE VR over

current protection threshold.

TSENA

Thermal Monitor Sense Pin of GFX VR.

OCSETA

Over Current Protection Setting of GFX VR. Connect to a resistive voltage divider

from VCC to GND to adjust the pin voltage VOCSETA from 0 to 3.3V for GFX VR over

current protection threshold.

IBIAS

Internal bias current setting. Connect a 53.6k

Ω resistor from IBIAS pin to GND.

VRHOT

Thermal Monitor Output (Active Low). Connect a pull high resistor from VRHOT pin

to 1.05V.

VR_READY

Voltage Ready Indicator of CORE VR. Connect a pull high resistor from

VR_READY pin to 1.05V.

VRA_READY

Voltage Ready Indicator GFX VR. Connect a pull high resistor from VRA_READY

pin to 1.05V.

DRPENA

Droop Enable Mode Setting of GFX VR. An internal 80

μA current source is

connected to DRPENA pin and flows out of this pin for 10

μs. Connect this pin to

VCC to enable droop function. Connect this pin to GND to disable droop function.

ALERT

SVID Alert Pin (Active Low). Connect a 75

Ω resistor from ALERT pin to 1.05V.

VDIO

Controller and CPU Data Transmission Interface. Connecting a 64.9

Ω resistor

between VDIO pin to 1.05V.

VCLK

Synchronous Clock from the CPU. Connect a 64.9

Ω resistor from VCLK pin to

1.05V.

IMONFBA

This pin is used to externally set the current monitor output gain of GFX VR.

Connect this pin with one resistor RIMONFBA to GFX VCC_SENSE while IMON pin

is connected to ground with another resistor RIMONA. The current monitor output

gain can be set by the ratio of these two resistors.

IMONA

Current Monitor Output of GFX VR. The output voltage VIMONA of this pin is

proportional to the output current. For digital output current reporting, detailed

VIMONA is generated by built-in ADC.

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