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CAT5419WI00 Datasheet(PDF) 10 Page - ON Semiconductor

Part # CAT5419WI00
Description  Dual Digitally Programmable Potentiometers (DPP?? with 64 Taps and 2-wire Interface
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT5419WI00 Datasheet(HTML) 10 Page - ON Semiconductor

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CAT5419
Doc. No. MD-2115 Rev. J
10
2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
The basic sequence of the three byte instructions is
illustrated in Figure 8. These three-byte instructions
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 tWRL. A transfer from the WCR (current
wiper position), to a Data Register is a write to non-
volatile memory and takes a maximum of tWR to
complete. The transfer can occur between one of the
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
CAT5419; 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
This transfers the contents of one specified Data
Register to the associated Wiper Control Register.
— XFR Wiper Control Register to Data Register
This transfers the contents of the specified Wiper
Control Register to the specified associated Data
Register.
— Global XFR Data Register to Wiper Control
Register
This transfers the contents of all specified Data
Registers to the associated Wiper Control Registers.
— Global XFR Wiper Counter Register to Data
Register
This transfers the contents of all Wiper Control
Registers to the specified associated Data
Registers.
INCREMENT/DECREMENT COMMAND
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 CAT5419 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 (tHIGH) while SDA is HIGH,
the selected wiper will move one resistor segment
towards the RH terminal. Similarly, for each SCL clock
pulse while SDA is LOW, the selected wiper will move
one resistor segment towards the RL terminal.
See Instructions format for more detail.
Figure 7. Two-Byte Instruction Sequence
Figure 8. Three-Byte Instruction Sequence
Figure 9. Increment/Decrement Instruction Sequence
S
T
A
R
T
01
0
1
A2
A0
A
C
K
I2 I1 I0
R1 R0
A
C
K
SD
S
T
O
P
ID3 ID2 ID1 ID0
P0
Device ID
Internal
Instruction
Opcode
Address
Register
Address
Pot/WCR
Address
A1
A3
I3
0
A
I3
I2
I1 I0
R1 R0
ID3 ID2 ID1ID0
Device ID
Internal
Instruction
Opcode
Address
Data
Register
Address
Pot/WCR
Address
WCR[7:0]
or
Data Register D[7:0]
S
T
A
R
T
01
0
1
A2 A1 A0 A
C
K
0P0 A
C
K
SDA
S
T
O
P
A
C
K
D7 D6 D5 D4 D3 D2 D1 D0
A3
I3
I2
I1
I0
ID3 ID2 ID1 ID0
Device ID
Internal
Instruction
Opcode
Address
Data
Register
Address
Pot/WCR
Address
S
T
A
R
T
01
01
A2 A1 A0
A
C
K
R0
0
P0
A
C
K
SDA
S
T
O
P
I
N
C
1
I
N
C
2
I
N
C
n
D
E
C
1
D
E
C
n
R1
A3


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