CAT5221W-10 ON Semiconductor, CAT5221W-10 Datasheet - Page 10

• Manufacturer Part Number: CAT5221W-10
• Manufacturer: ON Semiconductor

Specifications of CAT5221W-10

• Number Of Elements: 2
• # Of Taps: 64
• Resistance (max): 10KOhm
• 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: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Compliant

exchange data between the WCR and one of the Data
Registers. The WCR controls the position of the wiper.
The response of the wiper to this action will be delayed
by t
to a Data Register is a write to non-volatile memory and
takes a minimum of t
occur between one of the four potentiometers and one
of its associated registers; or the transfer can occur
between all potentiometers and one associated register.
Four instructions require a two-byte sequence to
complete, as illustrated in Figure 7. These instructions
transfer data between the host/processor and the
CAT5221; either between the host and one of the data
registers or directly between the host and the Wiper
Control Register. These instructions are:
— XFR Data Register to Wiper Control Register
—
Document No. 2113, Rev. G
SDA
SDA
This transfers the contents of one specified Data
Register to the associated Wiper Control Register.
This transfers the contents of the specified Wiper
Control Register to the specified associated
Data Register.
WRL
S
T
A
R
T
. A transfer from the WCR (current wiper position),
S
T
A
R
T
ID3 ID2 ID1 ID0
ID3 ID2 ID1 ID0
0
0
Device ID
Device ID
1
1
SDA
0
0
WR
1
S
T
A
R
T
1
A3
to complete. The transfer can
ID3 ID2 ID1 ID0
0
A3
A2 A1 A0 A
Device ID
1
Internal
Address
Internal
Address
A2 A1 A0
0
1
A3
C
K
A2
I3
A
C
K
Internal
Address
I3
A1
Instruction
Opcode
I2
Instruction
Opcode
A0
I1 I0
I2
I1
A
C
K
10
I3
Address
Pot/WCR
I0
0 P0
—
—
The final command is Increment/Decrement (Figure 5
and 9). The Increment/Decrement command is different
from the other commands. Once the command is issued
and the CAT5221 has responded with an acknowledge,
the master can clock the selected wiper up and/or down
in one segment steps; thereby providing a fine tuning
capability to the host. For each SCL clock pulse (t
while SDA is HIGH, the selected wiper will move one
resistor segment towards the R
each SCL clock pulse while SDA is LOW, the selected
wiper will move one resistor segment towards the R
terminal.
See Instructions format for more detail.
Instruction
Opcode
I2
Pot/WCR
Address
This transfers the contents of all specified Data
Registers to the associated Wiper Control
Registers.
This transfers the contents of all Wiper Control
Registers to the specified associated Data
Registers.
0
I1
R1 R0
Data
Register
Address
P0
I0
R1
Data
Register
Address
Pot/WCR
Address
A
C
K
0 P0
R0
D7 D6 D5 D4 D3 D2 D1 D0
A
C
K
Register
Address
R1 R0
N
C
1
I
Data Register D[7:0]
N
C
2
I
WCR[7:0]
A
C
K
or
H
S
T
O
P
terminal. Similarly, for
N
C
n
I
D
C
E
1
D
E
C
n
A
C
K
HIGH
O
S
T
P
S
T
O
P
L
)