cat5251 Catalyst Semiconductor, cat5251 Datasheet

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cat5251

Manufacturer Part Number
cat5251
Description
Quad Digitally Programmable Potentiometer Dpp? With 256 Taps And Spi Interface
Manufacturer
Catalyst Semiconductor
Datasheet

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Quad Digitally Programmable Potentiometer (DPP™) with
256 Taps and SPI Interface
FEATURES
PIN CONFIGURATION
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
For Ordering Information details, see page 14.
Four linear-taper digitally programmable
potentiometers
254 resistor taps per potentiometer
End to end resistance 50kΩ or 100kΩ
Potentiometer control and memory access via
SPI interface
Low wiper resistance, typically 100Ω
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 1µA
1,000,000 nonvolatile WRITE cycles
100 year nonvolatile memory data retention
SOIC 24-lead and TSSOP 24-lead
Industrial temperature range
R
TSSOP 24-Lead (Y)
R
R
¯¯¯ 11
¯¯¯ 12
WP
V
R
R
CS
SO
R
NC
SOIC 24-Lead (W)
A0
WO
W3
HO
CC
H3
LO
L3
10
1
2
3
4
5
6
7
8
9
5251
CAT
24 HOLD
23 SCK
22 R
21 R
20 R
19 NC
18 GND
17 R
16 R
15 R
14 A1
13 SI
¯¯¯¯¯
L2
H2
W2
W1
H1
L1
HOLD
SCK
WP
SO
CS
A0
A1
SI
1
DESCRIPTION
The
Potentiometers (DPPs™) integrated with control logic
and 16 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 four potentiometers is
automatically loaded into its respective wiper control
register.
The CAT5251 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.
FUNCTIONAL DIAGRAM
INTERFACE
CONTROL
CAT5251
SPI BUS
LOGIC
is
NONVOLATILE
REGISTERS
REGISTERS
CONTROL
WIPER
DATA
four
Digitally
R
R
H0
L0
CAT5251
R
R
Doc. No. MD-2017 Rev. F
Programmable
H1
L1
R
R
H2
L2
R
R
H3
L3
R
R
R
R
W0
W1
W2
W3

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cat5251 Summary of contents

Page 1

... The CAT5251 can be used as a potentiometer two terminal, variable resistor intended for circuit level or system level adjustments in a wide variety of applications available in the -40°C to 85°C industrial operating temperature range and offered in a 24-lead SOIC and TSSOP package ...

Page 2

... SI: Serial Input SI is the serial data input pin. This pin is used to input all opcodes, byte addresses and data to be written to the CAT5251. Input data is latched on the rising edge of the serial clock. SO: Serial Output SO is the serial data output pin. This pin is used to transfer data out of the CAT5251 ...

Page 3

... Latch-up protection is provided for stresses up to 100mA on address and data pins from – © Catalyst Semiconductor, Inc. Characteristics subject to change without notice DEVICE OPERATION The CAT5251 is four resistor arrays integrated with an SPI bus data SPI serial interface logic, four 8-bit wiper control registers and sixteen 8-bit, non-volatile memory data registers ...

Page 4

... CAT5251 POTENTIOMETER CHARACTERISTICS Over recommended operating conditions unless otherwise stated. Symbol Parameter R Potentiometer Resistance (-00) POT R Potentiometer Resistance (-50) POT Potentiometer Resistance Tolerance R Matching POT Power Rating I Wiper Current W R Wiper Resistance W V Voltage on any TERM H V Noise N Resolution (2) Absolute Linearity (3) Relative Linearity ...

Page 5

... CAT5251 (1) PIN CAPACITANCE Applicable over recommended operating range from T Symbol Parameter C Output Capacitance (SO) OUT C ¯¯¯ , SCK, SI, WP Input Capacitance (CS IN A.C. CHARACTERISTICS Over recommended operating conditions unless otherwise stated. Symbol Parameter t Data Setup Time SU t Data Hold Time H t SCK High Time ...

Page 6

... CAT5251 WRITE CYCLE LIMITS Over recommended operating conditions unless otherwise stated. Symbol Parameter t Write Cycle Time WR RELIABILITY CHARACTERISTICS Over recommended operating conditions unless otherwise stated. Symbol Parameter (1) N Endurance END (1) T Data Retention DR (1) V ESD Susceptibility ZAP (1) I Latch-Up LTH Figure 1. Sychronous Data Timing ...

Page 7

... Catalyst Semiconductor, Inc. Characteristics subject to change without notice INSTRUCTION BYTE The next byte sent to the CAT5251 contains the instruction and register pointer information. The four most significant bits used provide the instruction opcode I3-I0. The R1 and R0 bits point to one of the four data registers of each associated potentiometer ...

Page 8

... Finally loaded with the content of its data register zero (DR0) upon power-up. The Wiper Control Register is a volatile register that loses its contents when the CAT5251 is powered- down. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down ...

Page 9

... Four instructions require a two-byte sequence to complete, as illustrated in Figure 7. These instructions transfer data between the host/processor and the CAT5251; either between the host and one of the data registers or directly between the host and the Wiper Control Register. These instructions are: — XFR Data Register to Wiper Control Register This transfers the contents of one specified Data Register to the associated Wiper Control Register ...

Page 10

... CAT5251 Figure 10. Increment/Decrement INC/DEC Command Issued SCK INSTRUCTION FORMAT Read Wiper Control Register (WCR) DEVICE ADDRESSES ¯¯¯ Write Wiper Control Register (WCR) DEVICE ADDRESSES ¯¯¯ Read Data Register (DR) DEVICE ADDRESSES ¯ ...

Page 11

... CS Write Cycle 1 0 INSTRUCTION High Voltage ¯¯¯ CS Write Cycle INSTRUCTION ¯¯¯ INSTRUCTION I/D I CAT5251 (1) DATA . . . I/D I/D ¯¯¯ CS Doc. No. MD-2017 Rev. F ...

Page 12

... CAT5251 PACKAGING OUTLINE DRAWINGS (1)(2) SOIC 24-Lead 300mils ( PIN#1 IDENTIFICATION TOP VIEW D A SIDE VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC standard MS-013. Doc. No. MD-2017 Rev. F ...

Page 13

... For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-153. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice θ1 13 CAT5251 SYMBOL MIN NOM MAX A 1.20 A1 0.05 0.15 A2 0.80 1. ...

Page 14

... Y: TSSOP ORDERING PART NUMBER CAT5251WI-50 CAT5251WI-00 CAT5251YI-50 CAT5251YI-00 Notes: (1) All packages are RoHS compliant (Lead-free, Halogen-free). (2) This device used in the above example is a CAT5251WI-50-T1 (SOIC, Industrial Temperature, 50kΩ, Tape & Reel). Doc. No. MD-2017 Rev. F (1) I Temperature Range Resistance dustrial (- 40º ...

Page 15

... Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur ...

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