CAT5126 Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – One-Time Digitally Programmable 32 Tap Potentiometer

CAT5126
One-Time Digitally Programmable 32-Tap Potentiometer
FEATURES
„ Wiper position stored after one-time non-
volatile programming
„ User-defined Power-On wiper position
„ 32-tap positions
„ Wiper position programmed through simple
2-wire serial interface
„ Low 0.35 µA (typ) static supply current
„ 2.5 V to 5.5 V single-supply operation
„ 10 kΩ, 50 kΩ, and 100 kΩ end-to-end
resistances
„ 50 ppm/°C end-to-end temperature coefficient
and 5 ppm/°C ratiometric temperature
coefficient
„ TDFN 8-pad (2 x 3 mm) and MSOP 8-lead packages
APPLICATIONS
„ Mechanical potentiometer replacement
„ Products using one-time factory calibration
„ Contrast, brightness, volume controls
„ Programmable analog functions
DESCRIPTION
The CAT5126 is a digital programmable
potentiometer. The wiper position is controlled with a
simple 2-wire digital interface. This digital
potentiometer is unique in that it has an optional one-
time programmable feature that either sets the wiper’s
position upon power-on to a user-defined value, or the
wiper can be set and the interface also disabled to
prevent further adjustment.
The CAT5126 has an end-to-end resistance of 10 kΩ,
50 kΩ, and 100 kΩ. All CAT5126 devices have
32-wiper positions and operate from a single 2.5 V to
5.5 V supply.
The CAT5126 is available in TDFN 8-pad and MSOP
8-lead packages. Each device is guaranteed over the
industrial temperature range of -40°C to +85°C.
For Ordering Information details, see page 10.
PIN CONFIGURATION
MSOP (Z)
(top view)
R_W 1
8 R_H
¯C¯S¯ 2 _CAT 7 R_L
V_DD 3 ⁵¹²⁶ 6 U/D¯
GND 4
5 V_PP
TDFN (VP2)
(top view)
R_W 1
¯C¯S¯ 2
V_DD 3
GND 4
8 R_H
7 R_L
6 U/D¯
5 V_PP
FUNCTIONAL DIAGRAM
V_DD ³
GND
4
2
CS
U/D ₆
UP/DOWN
COUNTER
32-POSITION
DECODER
R_H
8
R₃₁
R₃₀
ONE-TIME
5
V_PP
PROGRAM
BLOCK
R₂
R₁
7
R_L
R_{W 1}
R_W
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-2129 Rev. D