Datasheet
Table Of Contents
- Features
- Applications
- Functional Block Diagram
- General Description
- Specifications
- Absolute Maximum Ratings
- Pin Configuration and Function Descriptions
- Typical Performance Characteristics
- Test Circuits
- Theory of Operation
- Serial Data Interface
- Shift Register
- RDAC Register
- 20-TP Memory
- Write Protection
- Basic Operation
- 20-TP Readback and Spare Memory Status
- Shutdown Mode
- Resistor Performance Mode
- Reset
- SDO Pin and Daisy-Chain Operation
- RDAC Architecture
- Programming the Variable Resistor
- Programming the Potentiometer Divider
- EXT_CAP Capacitor
- Terminal Voltage Operating Range
- Applications Information
- Outline Dimensions
Data Sheet AD5291/AD5292
THEORY OF OPERATION
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Table 12. Control Register Bit Map
1
DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
X X X X X X C3 C2 C1 C0
1
X = don’t care.
Table 13. Control Register Function
Bit Name Description
C0 20-TP program enable
0 = 20-TP program disabled (default)
1 = enable device for 20-TP program
C1 RDAC register write protect
0 = wiper position frozen to value in memory (default)
1
1 = allow update of wiper position through digital Interface
C2 Calibration enable
0 = resistor performance mode enabled (default)
1 = normal mode enabled
C3 20-TP memory program success
0 = fuse program command unsuccessful (default)
1 = fuse program command successful
1
Wiper position frozen to value last programmed in 20-TP memory. Wiper is frozen to midscale if 20-TP memory has not been previously programmed.