CAT5132ZI-10-GT3 ON Semiconductor, CAT5132ZI-10-GT3 Datasheet - Page 12

• Manufacturer Part Number: CAT5132ZI-10-GT3
• Description: IC POT DPP 15V 128TAP I2C 10MSOP
• Manufacturer: ON Semiconductor

Specifications of CAT5132ZI-10-GT3

• Taps: 128
• Resistance (ohms): 10K
• Number Of Circuits: 1
• Temperature Coefficient: 300 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Resistance In Ohms: 10K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Potentiometer Operation
Power−On
potentiometer. When applying power to the CAT5132, V
must be supplied prior to or simultaneously with V+. At the
same time, the signals on R
not exceed V+. If V+ is applied before V
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 V
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.
signals on R
V
wiper and uncontrolled current overload 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.
between the 0 position and the 127 position. These values
can be determined by dividing the end−to−end value of the
CC
The CAT5132 is a 128−position, digital controlled
At power−down, it is recommended to turn−off first the
The end−to−end nominal resistance of the potentiometer
Each contact point generates a linear resistive value
, in order to avoid unexpected transmissions of the
H
, R
W
and R
L
, followed by V+ and, after that,
H
, R
W
and R
L
CC
terminals should
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CC
CC
12
potentiometer by 127. In the case of the 10 kW potentiometer
~79 W is the resistance between each wiper position.
However in addition to the ~79 W for each resistive segment
of the potentiometer, a wiper resistance offset must be
considered. Table 19 shows the effect of this value and how
it would appear on the wiper terminal.
end−to−end resistance values in the same way as the 10 kW
example. However resistance between each wiper position
for the 50 kW version will be ~395 W and for the 100 kW
version will be ~790 W.
Table 19. POTENTIOMETER RESISTANCE AND
WIPER RESISTANCE OFFSET EFFECTS
This offset will appear in each of the CAT5132
Position
Position
127
126
127
00
01
63
00
64
Typical R
Typical R
W
W
10,070 W or
10,070 W or
5,047 W or
5,047 W or
to R
to R
149 W or
149 W or
70 W or
70 W or
L
H
Resistance for 10 kW DPP
Resistance for 10 kW DPP
10,000 W + 70 W
10,000 W + 70 W
4,977 W + 70 W
4,977 W + 70 W
79 W + 70 W
79 W + 70 W
0 W + 70 W
0 W + 70 W