ANALOG DEVICES UG-378 Service Manual
Quick Start Guide
V
V
UG-378
One Technology Way • P. O . Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel : 781.329.4700 • Fax : 781.461.3113 • www.analog.com
Overview of AD5110/AD5112/AD5114 Connections and Functionality
GENERAL DESCRIPTION
This quick start guide provides a general overview of AD5110/
AD5112/AD5114 connections and functionality and should be
reviewed in conjunction with the AD5110/AD5112/AD5114
data sheet.
FUNCTIONAL BLOCK DIAGRAM
LOGIC
POWER-ON
RESET
SDA
SCL
2
I
SERIAL
INTERFACE
DATA
C
DATA
DD
AD5110/AD5112/AD5114
EEPROM
RDAC
REGISTER
GND
Figure 1.
TYPICAL EXTERNAL CONNECTIONS
SUPPLIES
V
DD
++
GROUNDS
DIGITAL
GND
V
LOGIC
ANALOG
GND
A
W
B
0.1µF0.1µF10µF 10µF
10547-001
SCL
SDA
Figure 3.
PIN CONFIGURATION
1V
DD
NOTES
1. THE EXPOSED PAD IS INTERNALLY FLOATING.
2A
3W
4B
AD5110/
AD5112/
AD5114
TOP VIEW
(Not to Scale)
Figure 2.
8V
LOGIC
7SDA
6SCL
5GND
PIN FUNCTION DESCRIPTIONS
Table 1.
Pin No. Mnemonic Description
1 VDD Positive power supply.
2 A Terminal A of RDAC.
3 W Wiper terminal of RDAC.
4 B Terminal B of RDAC.
5 GND Ground pin.
6 SCL Serial clock line.
7 SDA Serial data line.
8 V
EPAD Internally floating exposed pad.
V
LOGIC
2.2kΩ
6
2.2kΩ
7
Logic power supply.
LOGI C
V
DD
A
2
18
3
w
4
5
B
10547-003
10547-002
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 4
UG-378 Quick Start Guide
OPERATIONAL CONDITIONS
Table 2. Specifications
Parameter Specification
VDD to GND 2.3 V to 5.5 V
V
to GND 1.8 V to VDD
LOGI C
VA, VW, VB to GND GND to VDD
Maximum Continuous IA, IW, IB
RAW = 5 kΩ and 10 kΩ ±6 mA
RAW = 80 kΩ ±1.5 mA
Maximum Clock (SCL) 400 kHz
Table 3. Device Address Selection
Model 7-Bit I2C Device Address
AD511X1 BCPZ Y2 0101111
AD511X1 BCPZ Y2-1 0101100
1
Model.
2
Resistance.
SHIFT REGISTER AND TIMING DIAGRAM
191 9 91
SCL
SDA
START BY
MASTER
111A1A0 C2C1
FRAME 1
SERIAL BUS ADDRESS BYTE
R/W0 000000
ACK. BY
AD5110
MOST SIGNIFICANT DATA BYTE
FRAME 2
C0 D7 D6 D5 D4 D3 D2 D1 D0
ACK. BY
AD5110
LEAST SIGNIFICANT DATA BYTE
FRAME 3
ACK. BY STOP BY
AD5110 MASTER
Figure 4. Write Sequence
COMMANDS
Table 4. Command Operation Truth Table
Command Data
Command
Number
DB10 DB8 DB7 DB0
C2 C1 C0 D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 X X X X X X X X No operation
1 0 0 1 X X X X X X X X Write contents of RDAC register to EEPROM
2 0 1 0 0
6
5 4 3 2 1
MSB
1 0 0 0 0 0 0 0 Top scale
1 1 1 1 1 1 1 1 Bottom scale
3 0 1 1 X X X X X X X A0 Software shutdown
4 1 0 0 X X X X X X X X Software reset: refresh RDAC register with EEPROM
5 1 0 1 X X X X X X X X Read contents of RDAC register
6 1 1 0 X X X X X X A1 A0 Read contents of EEPROM
1
X is a don’t care.
2
In the AD5114, this bit is a don’t care.
3
In the AD5112, this bit is a don’t care.
1
Operation
2
2, 3
Write contents of serial register data to RDAC
0
LSB
Shutdown off
Shutdown on
A1 A0 Data
0 0 Wiper position saved
0 1 Resistor tolerance
10547-004
Rev. 0 | Page 2 of 4
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