CAT5122SDI-50-GT3 ON Semiconductor, CAT5122SDI-50-GT3 Datasheet - Page 4

• Manufacturer Part Number: CAT5122SDI-50-GT3
• Manufacturer: ON Semiconductor

Specifications of CAT5122SDI-50-GT3

• Number Of Elements: 1
• # Of Taps: 16
• Resistance (max): 50KOhm
• Power Supply Requirement: Single
• Interface Type: Serial (2-Wire)
• Single Supply Voltage (typ): 3.3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 5
• Package Type: SC-70
• Lead Free Status / Rohs Status: Compliant

CAT5120, CAT5121, CAT5122
FUNCTIONAL DESCRIPTION
The CAT5120/5121/5122 consist of a fixed resistor and
a wiper contact with 16-tap points that are digitally
controlled through a 2-wire up/down serial interface.
Three end-to-end resistance values are available: 10 kΩ,
50 kΩ and 100 kΩ.
The CAT5120 is designed to operate as a potentiometer.
In this configuration, the low terminal of the resistor array
is connected to ground (pin 2).
The CAT5122 performs as a variable resistor. In this
device, the wiper terminal and high terminal of the
resistor array is connected at pin 5. The CAT5121 is a
similar variable resistor, except the low terminal is
connected to pin 5.
Digital Interface Operation
The MiniPots have two modes of operation when the
serial interface is active: increment and decrement
mode. The serial interface is only active when CS
Doc. No. MD-2121 Rev. G
CS
U/D
W
Note: "W" is not a digital signal. It represents wiper transitions.
CS
U/D
W
Note: "W" is not a digital signal. It represents wiper transitions.
t
CU
t
CU
Figure 2. Serial Interface Timing Diagram, Decrement Mode
Figure 1. Serial Interface Timing Diagram, Increment Mode
t
CI
t
SETTLE
t
CI
¯¯ is low.
t
SETTLE
t
IL
t
IH
4
The CS
wiper along the resistor array. When CS
from high to low, the part will go into increment mode
if U/D ¯ input is high, and into decrement mode when
U/D ¯ input is low. Once the mode is set, the device will
remain in that mode until CS
to-high transition at the U/D ¯ pin will increment or
decrement the wiper position depending on the
current mode (Figures 1 and 2).
When the CS
inactive), the value of the counter is stored and the
wiper position is maintained.
Note that when the wiper reaches the maximum (or
minimum) tap position, the wiper will not wrap around
to the minimum (or maximum) position.
Power-On Reset
All parts in this family feature power-on reset (POR)
circuitry that sets the wiper position to midscale at
power-up. By default, the chip is in the increment mode.
t
¯¯ and U/D ¯ inputs control the position of the
IH
t
IL
¯¯ input transitions to high (serial interface
t
SETTLE
Characteristics subject to change without notice
¯¯ goes high again. A low-
t
IC
© 2009 SCILLC. All rights reserved.
t
SETTLE
t
IC
¯¯ transitions