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CAT5241WI-30-T1 Datasheet(PDF) 10 Page - ON Semiconductor

Part # CAT5241WI-30-T1
Description  Quad Digital Potentiometer (POT)
Download  16 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT5241WI-30-T1 Datasheet(HTML) 10 Page - ON Semiconductor

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CAT5241
http://onsemi.com
10
Wiper Control and Data Registers
Wiper Control Register (WCR)
The CAT5241 contains four 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 CAT5241 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.
Data Registers (DR)
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 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 5 ms.
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.
Instructions
Four of the nine instructions are three bytes in length.
These instructions are:
Read Wiper Control Register – read the current wiper
position of the selected potentiometer in the WCR
Write Wiper Control Register – change current wiper
position in the WCR of the selected potentiometer
Read Data Register – read the contents of the selected
Data Register
Write Data Register – write a new value to the
selected Data Register.
Table 12. INSTRUCTION SET (Note: 1/0 = data is one or zero)
Instruction
Instruction Set
Operations
I3
I2
I1
I0
WCR1/P1
WCR0/P0
R1
R0
Read Wiper Control
Register
1
0
0
1
1/0
1/0
0
0
Read the contents of the Wiper
Control Register pointed to by P1−P0
Write Wiper Control
Register
1
0
1
0
1/0
1/0
0
0
Write new value to the Wiper Control
Register pointed to by P1−P0
Read Data Register
1
0
1
1
1/0
1/0
1/0
1/0
Read the contents of the Data
Register pointed to by P1−P0 and
R1−R0
Write Data Register
1
1
0
0
1/0
1/0
1/0
1/0
Write new value to the Data Register
pointed to by P1−P0 and R1−R0
XFR Data Register to
Wiper Control Register
1
1
0
1
1/0
1/0
1/0
1/0
Transfer the contents of the Data
Register pointed to by P1−P0 and
R1−R0 to its associated Wiper Control
Register
XFR Wiper Control
Register to Data
Register
1
1
1
0
1/0
1/0
1/0
1/0
Transfer the contents of the Wiper
Control Register pointed to by P1−P0
to the Data Register pointed to by
R1−R0
Global XFR Data
Registers to Wiper
Control Registers
0
0
0
1
0
0
1/0
1/0
Transfer the contents of the Data
Registers pointed to by R1−R0 of all
four pots to their respective Wiper
Control Registers
Global XFR Wiper
Control Registers to
Data Register
1
0
0
0
0
0
1/0
1/0
Transfer the contents of both Wiper
Control Registers to their respective
data Registers pointed to by R1−R0 of
all four pots
Increment/Decrement
Wiper Control Register
0
0
1
0
1/0
1/0
0
0
Enable Increment/decrement of the
Control Latch pointed to by P1−P0


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