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PDF CAT5132 Data sheet ( Hoja de datos )
| Número de pieza | CAT5132 | |
| Descripción | 16 Volt Digitally Programmable Potentiometer | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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CAT5132
16 Volt Digitally Programmable Potentiometer (DPP™)
with 128 Taps and 2-wire Interface
FEATURES
DESCRIPTION
I Single linear DPP with 128 taps
I End-to-end resistance of 10kΩ, 50kΩ or 100kΩ
I 2-wire (I2C-like) interface
I Fast Up/Down wiper control mode
I Non-volatile wiper setting storage
I Automatic wiper setting recall at power-up
I Digital Supply range (VCC): 2.7V to 5.5V
I Analog Supply range (V+): +8V to +16V
I Low Standby Current: 15µA
I 100 Year wiper setting memory
I Industrial Temperature range: -40oC to +85oC
I RoHS-compliant 10-pin MSOP package
The CAT5132 is a high voltage Digitally Programmable
Potentiometer (DPP) with non-volatile wiper setting
memory, operating like a mechanical potentiometer.
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). The wiper setting can be stored in a
7-bit non-volatile Data Register (DR). The WCR is
accessed via the 2-wire serial bus.
Upon power-up, the WCR is set to mid-scale (1000000).
After the power supply is stable, the contents of the DR
are transferred to the WCR and the wiper is returned to
the memorized setting.
The CAT5132 has two voltage supplies: VCC, the digital
supply and V+, the analog supply. V+ can be much
higher than VCC, allowing for 16V analog operations.
APPLICATIONS
I LCD screen adjustment
The CAT5132 can be used as a potentiometer or as a
two-terminal variable resistor.
www.DataSheet4U.com
I Volume control
I Mechanical potentiometer replacement
I Gain adjustment
I Line impedance matching
I VCOM setting adjustments
For Ordering Information details, see page 13.
BLOCK DIAGRAM
SDA
SCL
A0
A1
VCC
CONTROL LOGIC AND
ADDRESS DECODE
7-BIT
NONVOLATILE
MEMORY
REGISTER
(DR)
7-BIT WIPER
CONTROL
REGISTER
(WCR)
V+
127
128 TAP POSITION
DECODE CONTROL
0
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
RH
RL
RW
Doc. No. 25092, Rev. 04
1 page  
CAT5132
POWER UP TIMING (1)(2)
Symbol
Parameter
tPUR Power-up to Read Operation
tPUW Power-up to Write Operation
Min Max Units
1 ms
1 ms
XDCP TIMING
Symbol
Parameter
tWRPO
tWRL
Wiper Response Time After Power Supply Stable
Wiper Response Time After Instruction Issued
Min
5
5
Max Units
10 µs
10 µs
WRITE CYCLE LIMITS
Symbol
Parameter
tWR Write Cycle Time (see Fig. 2)
Min Max Units
5 ms
The write cycle is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle.
During the write cycle, the bus interface circuits are disabled, SDA is allowed to remain high and the device does not
respond to its slave address.
RELIABILITY CHARACTERISTICS
Symbol
Parameter
Reference Test Method
Min Max
N (1)
END
T (1)
DR
Endurance
Data Retention
MIL-STD-883, Test Method 1033
MIL-STD-883, Test Method 1008
100,000
100
Notes:
1. This parameter is tested initially and after a design or process change that affects the parameter.
2. tPUR and tPUW are the delays required from the time VCC is stable until the specified operation can be initiated.
Units
Cycles
Years
TYPICAL PERFORMANCE CHARACTERISTICS
12.000
10.000
8.000
6.000
4.000
2.000
0.000
0
Resistance between RW and RL
Vcc=2.7V; V+=8v
Vcc=5.5V; V+=16V
16 32 48 64 80 96 112 128
Tap position
Icc2 (NV write) vs Temperature
400
350
300
250
200
150
Vcc = 2.7V
100
Vcc = 5.5V
50
0
-50 -30 -10
10 30 50 70
Temperature (°C)
90 110 130
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc No. 25092, Rev. 04
5 Page 
CAT5132
POTENTIOMETER OPERATION
Power-On
The CAT5132 is a 128-position, digital controlled
potentiometer. When applying power to the CAT5132,
VCC must be suplied prior to or simultaneously with V+.
At the sametime, the signals on RH, RW and RL terminals
should not exceed V+. If V+ is applied before VCC, The
electronic switches of the DPP are powered in the
absence of the switch control signals, that could result in
multiple switches being turned on. This causes
unexpected wiper settings and possible current overload
of the potentiometer. When VCC is applied the device
turns on at the mid-point wiper location (64) until the
wiper register can be loaded with the nonvolatile memory
location previously stored in the device. After the
nonvolatile memory data is loaded into the wiper register
the wiper location will change to the previously stored
wiper position.
At power-down, it is recommended to turn-off first the
signals on RH, RW and RL, followed by V+ and, after that,
VCC, in order to avoid unexpected transmistions of the
wipper and uncontrolled current overload of the
potentiometer.
The end-to-end nominal resistance of the potentiometer
has 128 contact points linearly distributed across the
total resistor. Each of these contact points is addressed
by the 7 bit wiper register which is decoded to select one
of these 128 contact points.
Each contact point generates a linear resistive value
between the 0 position and the 127 position. These
values can be determined by dividing the end-to-end
value of the potentiometer by 127. In the case of the
10kΩ potentiometer ~79Ω is the resistance between
each wiper position. However in addition to the ~79Ω for
each resistive segment of the potentiometer, a wiper
resistance offset must be considered. Table 8 shows the
effect of this value and how it would appear on the wiper
terminal.
This offset will appear in each of the CAT5132 end-to-
end resistance values in the same way as the 10kΩ
example. However resistance between each wiper
position for the 50kΩ version will be ~395Ω and for the
100kΩ version will be ~790Ω.
Table 8. Potentiometer Resistance and Wiper
Resistance Offset Effects
Position
00
01
63
127
Typical RW to RL Resistance for
10kΩ DPP
70Ω or
0Ω + 70Ω
149Ω or
79Ω + 70Ω
5,047Ω or
4,977Ω + 70Ω
10,070Ω or
10,000Ω + 70Ω
Position
00
64
126
127
Typical RW to RH Resistance for
10kΩ DPP
10,070Ω or
10,000Ω + 70Ω
5,047Ω or
4,977Ω + 70Ω
149Ω or
79Ω + 70Ω
70Ω or
0Ω + 70Ω
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc No. 25092, Rev. 04
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT5132.PDF ] | |
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