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PDF CAT5261 Data sheet ( Hoja de datos )
| Número de pieza | CAT5261 | |
| Descripción | Dual Digital Potentiometer | |
| Fabricantes | ON Semiconductor | |
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CAT5261
Dual Digital
Potentiometer (POT)
with 256 Taps
and SPI Interface
Description
The CAT5261 is two digital POTs integrated with control logic and
8 bytes of NVRAM memory. Each digital POT 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
digital POT. 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
−40C to 85C industrial operating temperature range and offered in a
24-lead SOIC and TSSOP package.
Features
Two Linear-taper Digital 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
SOIC−24
W SUFFIX
CASE 751BK
PIN CONNECTIONS
SO
A0
NC
NC
NC
NC
VCC
RL0
RH0
RW0
CS
WP
1
CAT5261
SOIC−24 (W)
TSSOP−24 (Y)
(Top View)
HOLD
SCK
NC
NC
NC
NC
GND
RW1
RH1
RL1
A1
SI
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 8
1
Publication Order Number:
CAT5261/D
1 page  
CAT5261
Table 4. POTENTIOMETER CHARACTERISTICS (Over recommended operating conditions unless otherwise stated.)
Limits
Symbol
RPOT
RPOT
IW
RW
RW
VTERM
VN
Parameter
Potentiometer Resistance (−00)
Potentiometer Resistance (−50)
Potentiometer Resistance Tolerance
RPOT Matching
Power Rating
Wiper Current
Wiper Resistance
Wiper Resistance
Voltage on any RH or RL Pin
Noise
Resolution
Test Conditions
25C, each pot
IW = 3 mA @ VCC = 3 V
IW = 3 mA @ VCC = 5 V
(Note 3)
Min Typ Max Units
100 kW
50 kW
20 %
1%
50 mW
3 mA
200 300
W
100 150
W
0
VCC
V
nVHz
0.4 %
Absolute Linearity (Note 4)
Rw(n)(actual)−R(n)(expected)
(Note 7)
1 LSB
(Note 6)
Relative Linearity (Note 5)
Rw(n+1)−[Rw(n)+LSB]
(Note 7)
0.2 LSB
(Note 6)
TCRPOT
Temperature Coefficient of RPOT
(Note 3)
300
ppm/C
TCRATIO
Ratiometric Temp. Coefficient
(Note 3)
20 ppm/C
CH/CL/CW Potentiometer Capacitances
(Note 3)
10/10/25
pF
fc Frequency Response
RPOT = 50 kW (Note 3)
0.4 MHz
1. The minimum DC input voltage is –0.5 V. During transitions, inputs may undershoot to –2.0 V for periods of less than 20 ns. Maximum DC
voltage on output pins is VCC +0.5 V, which may overshoot to VCC +2.0 V for periods of less than 20 ns.
2. Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1 V to VCC +1 V.
3. This parameter is tested initially and after a design or process change that affects the parameter.
4. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
5. Relative linearity is utilized to determine the actual change in voltage between two successive tap positions when used as a potentiometer.
It is a measure of the error in step size.
6. LSB = RTOT / 255 or (RH − RL) / 255, single pot
7. n = 0, 1, 2, ..., 255
Table 5. D.C. OPERATING CHARACTERISTICS (VCC = +2.5 V to +6.0 V, unless otherwise specified.)
Symbol
Parameter
Test Conditions
Min
ICC1
ICC2
ISB
ILI
ILO
VIL
VIH
VOL1
VOH1
Power Supply Current
Power Supply Current
Non-volatile WRITE
Standby Current (VCC = 5 V)
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage (VCC = 3 V)
Output High Voltage
fSCL = 400 kHz, SDA = Open
VCC = 6 V, Inputs = GNDs
fSCK = 400 kHz, SDA Open
VCC = 6 V, Input = GND
VIN = GND or VCC, SDA = Open
VIN = GND to VCC
VOUT = GND to VCC
IOL = 3 mA
IOH = −1.6 mA
−1
VCC x 0.7
VCC – 0.8
Max
1
5
1
10
10
VCC x 0.3
VCC + 1.0
0.4
Units
mA
mA
mA
mA
mA
V
V
V
V
http://onsemi.com
5
5 Page 
CAT5261
INSTRUCTION FORMAT
Table 14. READ WIPER CONTROL REGISTER (WCR)
DEVICE ADDRESSES
INSTRUCTION
DATA
CS
0
1
0
1
0
0
A
1
A
0
1
0
0
1
0
0
P
1
P
0
7
6
5
4
3
2
1
0
CS
Table 15. WRITE WIPER CONTROL REGISTER (WCR)
DEVICE ADDRESSES
INSTRUCTION
DATA
CS
0
1
0
1
0
0
A
1
A
0
1
0
1
0
0
0
P
1
P
0
7
6
5
4
3
2
1
0
CS
Table 16. READ DATA REGISTER (DR)
DEVICE ADDRESSES
INSTRUCTION
DATA
CS
0
1
0
1
0
0
A
1
A
0
1
0
1
1
R
1
RP
01
P
0
7
6
5
4
3
2
1
0
CS
Table 17. WRITE DATA REGISTER (DR)
DEVICE ADDRESSES
INSTRUCTION
DATA
CS
0
1
0
1
0
0
A
1
A
0
1
1
0
0
R
1
RP
01
P
0
7
6
5
4
3
2
1
0
CS
High Voltage
Write Cycle
Table 18. READ STATUS (WIP)
DEVICE ADDRESSES
INSTRUCTION
DATA
CS
0
1
0
1
0
0
A
1
A
0
0
1
0
1
0
0
0
1
7
0
6
0
5
0
4
0
3
0
2
0
1
0
W
I
CS
P
Table 19. GLOBAL TRANSFER DATA REGISTER (DR) TO WIPER CONTROL REGISTER (WCR)
DEVICE ADDRESSES
INSTRUCTION
CS 0
1
0
1
0
0
A
1
A
0
0
0
0
1
RR
10
0
0
CS
Table 20. GLOBAL TRANSFER WIPER CONTROL REGISTER (WCR) TO DATA REGISTER (DR)
DEVICE ADDRESSES
INSTRUCTION
CS 0
1
0
1
0
0
A
1
A
0
1
0
0
0
RR
10
0
0
CS
High Voltage
Write Cycle
Table 21. TRANSFER WIPER CONTROL REGISTER (WCR) TO DATA REGISTER (DR)
DEVICE ADDRESSES
INSTRUCTION
CS 0
1
0
1
0
0
A
1
A
0
1
1
1
0
RR
10
P
1
P
0
CS
High Voltage
Write Cycle
http://onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT5261.PDF ] | |
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