ds4302 Maxim Integrated Products, Inc., ds4302 Datasheet

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ds4302

Manufacturer Part Number
ds4302
Description
Ds4302 2-wire, 5-bit Dac With Three Digital Outputs
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
The DS4302 is a 5-bit digital-to-analog converter (DAC)
with three programmable digital outputs. The DS4302
communicates through a 2-wire, SMBus™-compatible,
serial interface. The tiny 8-pin µSOP package is ideal
for use in space-constrained applications.
Rev 1; 6/04
SMBus is a trademark of Intel Corp.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PIN
1
2
3
4
5
6
7
8
CCFL Backlight Brightness Control
Power-Supply Calibration
2-Wire, 5-Bit DAC with Three Digital Outputs
NAME
V
GND
SDA
SCL
V
OUT
P2
P1
P0
CC
Serial Clock Input. 2-wire clock input.
Serial Data Input/Output. Bidirectional,
2-wire data pin.
DAC Output Voltage
Ground
Programmable Digital Output
Power-Supply Input
General Description
Pin Description
FUNCTION
Applications
______________________________________________ Maxim Integrated Products
♦ SO Package is a Drop-In Replacement for the
♦ Single 5-Bit DAC (32 Steps)
♦ 0V to 2V and 0V to 1.9V Versions
♦ Three Programmable Digital Outputs
♦ SMBus-Compatible Serial Interface
♦ 4.5V to 5.5V Supply Voltage Range
♦ 8-Pin SO and 8-Pin µSOP Packages
♦ Industrial Temperature Range: -40°C to +85°C
Add “/T&R” for tape-and-reel orders.
*Contact factory for availability.
DS4302Z-020
DS4302Z-019*
DS4302U-020
DS4302U-019*
MPS1251 and MPS1252
PART
TOP VIEW
V
GND
SCL
SDA
OUT
0V to 2.0V
0V to 1.9V
0V to 2.0V
0V to 1.9V
RANGE
V
1
2
4
3
OUT
Ordering Information
SO/µSOP
DS4302
Pin Configuration
BRAND
4302B
4302A
4302B
4302A
TOP
6
8
7
5
Features
V
P0
P1
P2
CC
PIN-
PACKAGE
8 SO
8 SO
8 µSOP
8 µSOP
1

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ds4302 Summary of contents

Page 1

... Rev 1; 6/04 2-Wire, 5-Bit DAC with Three Digital Outputs General Description The DS4302 is a 5-bit digital-to-analog converter (DAC) with three programmable digital outputs. The DS4302 communicates through a 2-wire, SMBus™-compatible, serial interface. The tiny 8-pin µSOP package is ideal for use in space-constrained applications. ...

Page 2

DAC with Three Digital Outputs ABSOLUTE MAXIMUM RATINGS Voltage Range SDA, and SCL Pins CC Relative to Ground.............................................-0.5V to +6.0V Operating Temperature Range ...........................-40°C to +85°C Stresses beyond those listed under “Absolute Maximum Ratings” may ...

Page 3

... SDA = SCL = V STBY Note 3: No load OUT Note 4: The DS4302 will not obstruct the SDA and SCL lines if V does not violate their min and max input-voltage levels. Note 5: C —total capacitance of one bus line in picofarads. B ...

Page 4

... SUPPLY VOLTGE 300 OUTPUTS UNLOADED 250 SDA = SCL = V CC 200 150 100 50 0 4.50 4.75 5.00 5.25 5.50 SUPPLY VOLTAGE (V) V vs. DAC SETTING OUT 2.0 DS4302-020 VERSION 1.5 1.0 0 DAC SETTING (dec) 4 _____________________________________________________________________ Typical Operating Characteristics STANDBY SUPPLY CURRENT vs. TEMPERATURE 300 OUTPUTS UNLOADED SDA = SCL = ...

Page 5

... DAC with Three Digital Outputs SDA 2-WIRE INTERFACE SCL V OUT BUFFER GND DS4302 _____________________________________________________________________ DATA BYTE REGISTER LSB MSB DAC VALUE 5-BIT DAC BANDGAP REFERENCE Functional Diagram OUTPUT CELL OUTPUT CELL P1 OUTPUT CELL P2 5 ...

Page 6

... P1 MSB Figure 1. Data Byte Configuration Detailed Description The DS4302 contains a 5-bit DAC and three programma- ble digital outputs. The DAC setting and the pro- grammed output levels are contained in a 1-byte data word that defaults to 00h on power-up (see Figure 1 for data byte configuration). The upper 5 MSbits of the byte ...

Page 7

... The slave address (see Figure 4) is the most signifi- cant 7 bits and the R/W bit is the least significant bit. The DS4302’s slave address is 0101100X (binary), where X is the R/W bit. If the R/W bit is zero (01011000), the master will write data to the slave. If the R one (01011001), the master will read data from the slave ...

Page 8

... STOP condition. See Figure 2 for the read com- mand example. Application Information Power-Supply Decoupling To achieve the best results when using the DS4302, decouple the power supply with a 0.01µ 0.1µF capacitor. Use high-quality, ceramic, surface-mount capacitors, and mount the capacitors as close as pos- ...

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