CAT5221WI-00TE13 ON Semiconductor, CAT5221WI-00TE13 Datasheet - Page 9

• Manufacturer Part Number: CAT5221WI-00TE13
• Manufacturer: ON Semiconductor

Specifications of CAT5221WI-00TE13

• Number Of Elements: 2
• # Of Taps: 64
• Resistance (max): 100KOhm
• Power Supply Requirement: Single
• Interface Type: Serial (2-Wire/I2C)
• Single Supply Voltage (typ): 3.3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): 2.5V
• Single Supply Voltage (max): 6V
• 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: 20
• Lead Free Status / RoHS Status: Compliant

The CAT5221 contains two 6-bit Wiper Control Registers,
one for each potentiometer. The Wiper Control Register
output is decoded to select one of 64 switches along its
resistor array. The contents of the WCR can be altered
in four ways: it may be written by the host via Write Wiper
Control Register instruction; it may be written by
transferring the contents of one of four associated Data
Registers via the XFR Data Register instruction, it can be
modified one step at a time by the Increment/decrement
instruction (see Instruction section for more details).
Finally, it is 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 CAT5221 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.
Each potentiometer has four 6-bit non-volatile Data
Registers. These can be read or written directly by the
host. Data can also be transferred between any of the
Note: 1/0 = data is one or zero
Read Wiper Control
Register
Write Wiper Control Register
Read Data Register
Write Data Register
XFR Data Register to Wiper
Control Register
XFR Wiper Control Register
to Data Register
Global XFR Data Registers
to Wiper Control Registers
Global XFR Wiper Control
Registers to Data Register
Increment/Decrement Wiper
Control Register
Instruction
I3
1
1
1
1
1
1
0
1
0
0
0
0
1
1
1
0
0
0
I2
I1
0
1
1
0
0
1
0
0
1
Instruction Set
1
0
1
0
1
0
1
0
0
I0
0
0
0
0
0
0
0
0
0
0
WCR0/
1/0
1/0
1/0
1/0
1/0
1/0
1/0
P0
9
0
0
four Data Registers and the associated Wiper Control
Register. Any data changes in one of the Data Registers
is a non-volatile operation and will take a maximum of
5ms.
If the application does not require storage of multiple
settings for the potentiometer, the Data Registers can be
used as standard memory locations for system
parameters or user preference data.
Four of the nine instructions are three bytes in length.
These instructions are:
— Read Wiper Control Register - read the current
—
—
—
The basic sequence of the three byte instructions is
illustrated in Figure 8. These three-byte instructions
1/0
1/0
1/0
1/0
1/0
1/0
R1
0
0
0
wiper position of the selected potentiometer in the WCR
wiper position in the WCR of the selected potentiometer
selected Data Register
selected Data Register
1/0
1/0
1/0
1/0
1/0
1/0
R0
0
0
0
Read the contents of the Wiper Control
Register pointed to by P0
Write new value to the Wiper Control
Register pointed to by P0
Read the contents of the Data Register
pointed to by P0 and R1-R0
Write new value to the Data Register
pointed to by P0 and R1-R0
Transfer the contents of the Data Register
pointed to by P0 and R1-R0 to its
associated Wiper Control Register
Transfer the contents of the Wiper Control
Register pointed to by P0 to the Data
Register pointed to by R1-R0
Transfer the contents of the Data Registers
pointed to by R1-R0 of all four pots to their
respective Wiper Control Register
Transfer the contents of both Wiper Control
Registers to their respective data Registers
pointed to by R1-R0 of all four pots
Enable Increment/decrement of the Control
Latch pointed to by P0
Operation
- write a new value to the
- read the contents of the
- change current
Document No. 2113, Rev. I
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