X9261_06 Datasheet, PDF (3/20 Pages) Intersil Corporation – Dual Digitally-Controlled Potentiometers

X9261
SYSTEM LEVEL APPLICATIONS
• Adjust the contrast in LCD displays
• Control the power level of LED transmitters in
communication systems
• Set and regulate the DC biasing point in an RF
power amplifier in wireless systems
• Control the gain in audio and home entertainment
systems
• Provide the variable DC bias for tuners in RF wire-
less systems
• Set the operating points in temperature control
systems
• Control the operating point for sensors in industrial
systems
• Trim offset and gain errors in artificial intelligent
systems
PIN CONFIGURATION
SO
A0
NC
NC
NC
NC
V_CC
R_L0
R_H0
R_W0
CS
WP
SOIC/TSSOP
1
24
2
23
3
22
4
21
5
20
6
19
7 ^X9261 18
8
17
9
16
10
15
11
14
12
13
HOLD
SCK
NC
NC
NC
NC
V_SS
R_W1
R_H1
R_L1
A1
SI
PIN ASSIGNMENTS
Pin
(SOIC/
TSSOP) Symbol
Function
1
SO Serial Data Output for SPI bus
2
A0 Device Address for SPI bus.
3
NC No Connect.
4
NC No Connect.
5
NC No Connect.
6
NC No Connect.
7
V_CC System Supply Voltage
8
R_L0 Low Terminal for Potentiometer 0.
9
R_H0 High Terminal for Potentiometer 0.
10
R_W0 Wiper Terminal for Potentiometer 0.
11
CS Device Address for SPI bus.
12
WP Hardware Write Protect
13
SI Serial Data Input for SPI bus
14
A1 Device Address for SPI bus.
15
R_L1 Low Terminal for Potentiometer 1.
16
R_H1 High Terminal for Potentiometer 1.
17
R_W1 Wiper Terminal for Potentiometer 1.
18
V_SS System Ground
19
NC No Connect
20
NC No Connect
21
NC No Connect
22
NC No Connect
23
SCK Serial Clock for SPI bus
24
HOLD Device select. Pause the SPI serial bus.
PIN DESCRIPTIONS
Bus Interface Pins
SERIAL OUTPUT (SO)
SO is a serial data output pin. During a read cycle,
data is shifted out on this pin. Data is clocked out by
the falling edge of the serial clock.
SERIAL INPUT
SI is the serial data input pin. All opcodes, byte
addresses and data to be written to the pots and pot
registers are input on this pin. Data is latched by the
rising edge of the serial clock.
SERIAL CLOCK (SCK)
The SCK input is used to clock data into and out of the
X9261.
3
FN8171.4
October 12, 2006