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  Richtek Technology Electronic Components Datasheet  

RT9403 Datasheet

I2C Programmable High Precision Reference Voltage Generator

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RT9403
I2C Programmable High Precision Reference Voltage
Generator
General Description
Features
The RT9403 is a high precision reference voltage generating
console consisting of three I2C programmable DACs. Each
DAC output voltage is controlled by 7 digital bits that are
programmed by the I2C interface. The RT9403 features
adjustable output slew rate, low switching glitch and
adequate driving capability. The RT9403 is available in
SOT-23-8 package.
Ordering Information
RT9403
Package Type
V8 : SOT-23-8
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
z 5V Supply Voltage
z Provide 3 Precise Voltage DACs
z I2C Programmable 128-Steps Output Voltage
z Output Range and Resolution
` DAC1 & DAC2 : 0.6V to 2.1875V, 12.5mV/Step
` DAC3 : 1.2V to 3.375V, 12.5mV (or 25mV)/Step for
Different Segments
z High Output Accuracy Up to 1% (VOUT 1V)
z Low External Component Count
z Small Footprint SOT-23-8 Package
z RoHS Compliant and Halogen Free
Applications
z Power Supply Adjustment for Motherboard and Graphic
Card
z Low Voltage, High Accuracy Reference Voltage Circuit
Pin Configurations
(TOP VIEW)
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
87 6 5
2 34
Typical Application Circuit
3.3V/5V 5V
Data Bus Line
Clock Bus Line
S3/EN
RT9403
1 VDD
CIN
VOUT1 5
VOUT2 6
4 SDA
3 SCL
8 S3/EN
VOUT3 7
GND 2
DS9403-01 April 2011
SOT-23-8
VIN1
REFIN DC/DC
COUT1
Converter
VIN2
REFIN DC/DC
COUT2
Converter
VIN3
REFIN DC/DC
COUT3
Converter
V1
V2
V3
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9403 Datasheet

I2C Programmable High Precision Reference Voltage Generator

No Preview Available !

RT9403
Functional Pin Description
Pin No. Pin Name
Pin Function
1 VDD
Power Supply Input. Default connected to 5V.
2 GND
3 SCL
4 SDA
5 VOUT1
6 VOUT2
7 VOUT3
G round .
Serial Clock Input. This pin receives I2C serial bus clock signal.
Serial Data Input. This pin is input or output of I2C serial bus data signal.
I2C Programmed VTT Output Voltage. Default = 1.1V
I2C Programmed PCH_CORE Output Voltage. Default = 1.05V
I2C Programmed DDR Output Voltage. Default = 1.5V
8 S3/EN
ACPI S3 State/Enable. Active low for entering ACPI S3 State(suspend to RAM),
VOUT1/VOUT2 are internally pulled down to zero, only VOUT3 is active.
Function Block Diagram
VDD
I2C
Interface
S3/EN
SCL
SDA
GND
POR
Control and
Monitoring Unit
DAC1
7 bit
DAC2
7 bit
DAC3
7 bit
VOUT1
VOUT2
VOUT3
www.richtek.com
2
DS9403-01 April 2011


Part Number RT9403
Description I2C Programmable High Precision Reference Voltage Generator
Maker Richtek Technology
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RT9403 Datasheet PDF






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