© Semiconductor Components Industries, LLC, 2012
February, 2012 − Rev. 7
1 Publication Order Number:
CAT5261/D
CAT5261
Dual Digitally Program-
mable Potentiometers (DPP)
with 256 Taps and SPI
Interface
Description
The CAT5261 is two Digitally Programmable Potentiometers
(DPPs) integrated with control logic and 8 bytes of NVRAM memory.
Each DPP consists of a series of resistive elements connected between
two externally accessible end points. The tap points between each
resistive element are connected to the wiper outputs with CMOS
switches. A separate 8−bit control register (WCR) independently
controls the wiper tap switches for each DPP. Associated with each
wiper control register are four 8−bit non−volatile memory data
registers (DR) used for storing up to four wiper settings. Writing to the
wiper control register or any of the non−volatile data registers is via a
SPI serial bus. On power−up, the contents of the first data register
(DR0) for each of the potentiometers is automatically loaded into its
respective wiper control register.
The CAT5261 can be used as a potentiometer or as a two terminal,
variable resistor. It is intended for circuit level or system level
adjustments in a wide variety of applications. It is available in the
−40°C to 85°C industrial operating temperature range and offered in a
24−lead SOIC and TSSOP package.
Features
• Two Linear−taper Digitally Programmable Potentiometers
• 256 Resistor Taps per Potentiometer
• End to End Resistance 50 kW or 100 kW
• Potentiometer Control and Memory Access via SPI Interface
• Low Wiper Resistance, Typically 100 W
• Nonvolatile Memory Storage for up to Four Wiper Settings for Each
Potentiometer
• Automatic Recall of Saved Wiper Settings at Power Up
• 2.5 to 6.0 Volt Operation
• Standby Current less than 1 mA
• 1,000,000 Nonvolatile WRITE Cycles
• 100 Year Nonvolatile Memory Data Retention
• 24−lead SOIC and 24−lead TSSOP
• Industrial Temperature Range
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
http://onsemi.com
TSSOP−24
Y SUFFIX
CASE 948AR
PIN CONNECTIONS
SOIC−24 (W)
TSSOP−24 (Y)
(Top View)
HOLD
SO
A0
NC
1
NC
NC
SCK
NC
NC
NC
SOIC−24
W SUFFIX
CASE 751BK
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
ORDERING INFORMATION
NC
GND
R
W1
R
H1
R
L1
NC
V
CC
R
L0
R
H0
R
W0
CAT5261
A1
SI
CS
WP
页面指南
