X9418 Datasheet, PDF(5/21 Page) Xicor Inc. – Dual Digitally Controlled Potentiometers

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X9418 Datasheet, PDF (5/21 Pages) Xicor Inc. – Dual Digitally Controlled Potentiometers

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X9418

Figure 3. Two-Byte Instruction Sequence

SCL

SDA

S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 R1 R0 0 P0 A S

The Increment/Decrement command is different from

the other commands. Once the command is issued and

the X9418 has responded with an acknowledge, the

master can clock the selected wiper up and/or down in

one segment steps; thereby, providing a ï¬ne 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 VH/RH terminal. Similarly,

for each SCL clock pulse while SDA is LOW, the

selected wiper will move one resistor segment towards

the VL/RL terminal. A detailed illustration of the

sequence and timing for this operation are shown in

Figures 5 and 6 respectively.

Table 1. Instruction Set

Instruction Set

Instruction

Read Wiper Counter

Write Wiper Counter

Read Data Register

Write Data Register

XFR Data Register to

Wiper Counter Register

I3 I2 I1 I0 R1 R0 P1 P0

Operation

1 0 0 1 0 0 0 1/0 Read the contents of the Wiper Counter Register

pointed to by P0

1 0 1 0 0 0 0 1/0 Write new value to the Wiper Counter Register

pointed to by P0

1 0 1 1 1/0 1/0 0 1/0 Read the contents of the Data Register pointed to

by P0 and R1âR0

1 1 0 0 1/0 1/0 0 1/0 Write new value to the Data Register pointed to by

P0 and R1âR0

1 1 0 1 1/0 1/0 0 1/0 Transfer the contents of the Data Register pointed

to by P0 and R1âR0 to its associated Wiper Counter

XFR Wiper Counter

1 1 1 0 1/0 1/0 0 1/0 Transfer the contents of the Wiper Counter Register

pointed to by P0 to the Data Register pointed to by

R1âR0

Global XFR Data

0 0 0 1 1/0 1/0 0 0 Transfer the contents of the Data Registers pointed

Registers to Wiper

Counter Registers

to by R1âR0 of both pots to their respective Wiper

Counter Registers

Global XFR Wiper

1 0 0 0 1/0 1/0 0 0 Transfer the contents of both Wiper Counter

Counter Registers to

Registers to their respective data Registers pointed

Data Register

to by R1âR0 of both pots

Increment/Decrement

0 0 1 0 0 0 0 1/0 Enable Increment/decrement of the Wiper Counter

Wiper Counter Register

Note: (7) 1/0 = data is one or zero

REV 1.1.5 7/23/02

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Characteristics subject to change without notice. 5 of 21

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