Voltage Generator. RT9403C Datasheet

RT9403C Generator. Datasheet pdf. Equivalent

RT9403C Datasheet
Recommendation RT9403C Datasheet
Part RT9403C
Description High Precision Reference Voltage Generator
Feature RT9403C; RT9403A/B/C I2C Programmable High Precision Reference Voltage Generator General Description Featu.
Manufacture Richtek Technology
Datasheet
Download RT9403C Datasheet




Richtek Technology RT9403C
RT9403A/B/C
I2C Programmable High Precision Reference Voltage Generator
General Description
Features
The RT9403A/B/C 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
RT9403A/B/C features adjustable output slew rate, low
switching glitch and adequate driving capability. The
RT9403A/B/C is available in SOT-23-8 package.
Ordering Information
RT9403A/B/C
Package Type
V8 : SOT-23-8
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
Lead Plating System
Applications
G : Green (Halogen Free and Pb Free)
z Power Supply Adjustment for Motherboard and Graphic
Address Bit [A1,A0]
A : [0,1]
Card
B : [1,0]
z Low Voltage, High Accuracy Reference Voltage Circuit
C : [1,1]
Note :
Richtek products are :
Pin Configurations
(TOP VIEW)
` 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.
87 6 5
Marking Information
RT9403AGV8
01=DNN
01= : Product Code
DNN : Date Code
2 34
SOT-23-8
RT9403BGV8
02=DNN
02= : Product Code
DNN : Date Code
RT9403CGV8
04=DNN
04= : Product Code
DNN : Date Code
DS9403A/B/C-00 May 2011
www.richtek.com
1



Richtek Technology RT9403C
RT9403A/B/C
Typical Application Circuit
Data Bus Line
Clock Bus Line
3.3V/5V 5V
RT9403A/B/C
1 VDD
CIN
S3/EN
4 SDA
3 SCL
8 S3/EN
VOUT1 5
VOUT2 6
VOUT3 7
GND 2
VIN1
REFIN DC/DC
COUT1
Converter
VIN2
REFIN DC/DC
COUT2
Converter
VIN3
REFIN DC/DC
COUT3
Converter
V1
V2
V3
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
DS9403A/B/C-00 May 2011



Richtek Technology RT9403C
SVID6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SVID5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
RT9403A/B/C
SVID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Table 1. DAC1/DAC2 Serial Code Table
SVID3
S VID 2
SVID1
SVI D0
00 0 0
00 0 1
00 1 0
00 1 1
01 0 0
01 0 1
01 1 0
01 1 1
10 0 0
10 0 1
10 1 0
10 1 1
11 0 0
11 0 1
11 1 0
11 1 1
00 0 0
00 0 1
00 1 0
00 1 1
01 0 0
01 0 1
01 1 0
01 1 1
10 0 0
10 0 1
10 1 0
10 1 1
11 0 0
11 0 1
11 1 0
11 1 1
00 0 0
00 0 1
00 1 0
00 1 1
01 0 0
01 0 1
01 1 0
01 1 1
Output Voltage ( V )
2.1 875
2.1 750
2.1 625
2.1 500
2.1 375
2.1 250
2 .112 5
2.1 000
2.0 875
2.0 750
2.0 625
2.0 500
2.0 375
2.0 250
2.0 125
2.0 000
1.9 875
1.9 750
1.9 625
1.9 500
1.9 375
1.9 250
1.9 125
1.9 000
1.8 875
1.8 750
1.8 625
1.8 500
1.8 375
1.8 250
1.8 125
1.8 000
1.7 875
1.7 750
1.7 625
1.7 500
1.7 375
1.7 250
1.7 125
1.7 000
To be continued
DS9403A/B/C-00 May 2011
www.richtek.com
3







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