X9408_14 Datasheet, PDF(6/20 Page) Intersil Corporation – Quad Digitally Controlled Potentiometers

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

X9408_14 Datasheet, PDF (6/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

◁

X9408

The Increment/Decrement command is different from the

other commands. Once the command is issued and the

X9408 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. 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

I3 I2 I1 I0 R1 R0 P1 P0

OPERATION

Read Wiper CounterRegister 1 0 0 1 0 0 P1 P0 Read the contents of the Wiper Counter Register pointed to by

P1 - P0

Write Wiper CounterRegister 1 0 1 0 0 0 P1 P0 Write new value to the Wiper Counter Register pointed to by P1 - P0

Read Data Register

1 0 1 1 R1 R0 P1 P0 Read the contents of the Data Register pointed to by P1 - P0 and

R1 - R0

Write Data Register

1 1 0 0 R1 R0 P1 P0 Write new value to the Data Register pointed to by

P1 - P0 and R1 - R0

XFR Data Register to Wiper 1 1 0 1 R1 R0 P1 P0 Transfer the contents of the Data Register pointed to by P1 - P0

Counter Register

and R1 - R0 to its associated Wiper Counter Register

XFR Wiper Counter Register 1 1 1 0 R1 R0 P1 P0 Transfer the contents of the Wiper Counter Register pointed to by

to Data Register

P1 - P0 to the Data Register pointed to by R1 - R0

Global XFR Data Registers 0 0 0 1 R1 R0 0

to Wiper Counter Registers

0 Transfer the contents of the Data Registers pointed to by R1 - R0

of all four pots to their respective Wiper Counter Registers

Global XFR Wiper Counter

Registers to Data Register

1 0 0 0 R1 R0 0

0 Transfer the contents of both Wiper Counter Registers to their

respective Data Registers pointed to by

R1 - R0 of all four pots

Increment/Decrement Wiper 0 0 1 0 0 0 P1 P0 Enable Increment/decrement of the Wiper Counter Register

Counter Register

pointed to by P1 - P0

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

SCL

SDA

1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 R1 R0 P1 P0 A 0

0 D5 D4 D3 D2 D1 D0 A S

FIGURE 4. THREE-BYTE INSTRUCTION SEQUENCE

SCL

SDA

S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 R1 R0 P1 P0 A I I

CNN

KCC

FIGURE 5. INCREMENT/DECREMENT INSTRUCTION SEQUENCE

FN8191.4

January 15, 2009

▷