CAT5136, CAT5137, and CAT5138 are a family of digital POTs operating like mechanical potentiometers in various configurations. The tap points between the 127 equal resistive elements are connected to the wiper output via CMOS switches. The switches are controlled by a 7-bit Wiper Control Register (WCR) via the I2C serial bus. CAT5136 is configured as a variable resistor. CAT5137 and CAT5138 are resistive voltage dividers, with one terminal of the potentiometer connected to GND. CAT5137 and CAT5138 have different device IDs, which makes it possible to use both on the same I2C bus. Upon power-up, the WCR is set to mid-scale (1000000).
Applications
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Gain Adjustment
Line Impedance Matching
VCOM Setting Adjustments
End Products
Industrial Equipment
Features
Single Linear digital POT with 128 Taps
End-to-End Resistance of 10 kΩ, 50 kΩ and 100 kΩ
I2C Interface
Wiper goes to Midscale at Power-up
Digital Supply Range (VDD): 2.7 V to 5.5 V
Low Standby Current
Industrial Temperature Range: -40°C to +85°C