CAT5221WI-25-T1 ON Semiconductor, CAT5221WI-25-T1 Datasheet - Page 10

• Manufacturer Part Number: CAT5221WI-25-T1
• Description: IC POT DPP 2.5K 64TAP 20SOIC
• Manufacturer: ON Semiconductor

Specifications of CAT5221WI-25-T1

• Taps: 64
• Resistance (ohms): 2.5K
• Number Of Circuits: 2
• Temperature Coefficient: 300 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Resistance In Ohms: 2.5K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Wiper Control and Data Registers
Wiper Control Register (WCR)
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.
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.
Data Registers (DR)
Registers. These can be read or written directly by the host.
NOTE:
Table 12. INSTRUCTION SET
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
The CAT5221 contains two 6−bit Wiper Control
The Wiper Control Register is a volatile register that loses
Each potentiometer has four 6−bit non−volatile Data
1/0 = data is one or zero
Instruction
I3
1
1
1
1
1
1
0
1
0
I2
0
0
0
1
1
1
0
0
0
I1
0
1
1
0
0
1
0
0
1
I0
Instruction Set
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
http://onsemi.com
WCR0/
1/0
1/0
1/0
1/0
1/0
1/0
1/0
P0
0
0
10
1/0
1/0
1/0
1/0
1/0
1/0
R1
0
0
0
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.
settings for the potentiometer, the Data Registers can be used
as standard memory locations for system parameters or user
preference data.
Instructions
These instructions are:
If the application does not require storage of multiple
Four of the nine instructions are three bytes in length.
♦
♦
♦
♦
1/0
1/0
1/0
1/0
1/0
1/0
R0
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
Read Wiper Control Register – read the current
Write Wiper Control Register – change current
Read Data Register – read the contents of the
Write Data Register – write a new value to the
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 Registers
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