X9269TV24IZ-2.7T1 Intersil, X9269TV24IZ-2.7T1 Datasheet - Page 6

• Manufacturer Part Number: X9269TV24IZ-2.7T1
• Description: IC POT XDCP DUAL 50K OHM 24-SOIC
• Manufacturer: Intersil
• Series: XDCP™r

Specifications of X9269TV24IZ-2.7T1

• Taps: 256
• Resistance (ohms): 100K
• Number Of Circuits: 2
• Temperature Coefficient: 300 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Resistance In Ohms: 100K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRINCIPLES OF OPERATION
The X9269 is a integrated microcircuit incorporating
four resistor arrays and their associated registers and
counters and the serial interface logic providing direct
communication between the host and the digitally
controlled potentiometers. This section provides detail
description of the following:
– Resistor Array Description
– Serial Interface Description
– Instruction and Register Description.
Array Description
The X9269 is comprised of a resistor array (See Figure
1). Each array contains 255 discrete resistive segments
that are connected in series. The physical ends of each
array are equivalent to the fixed terminals of a
mechanical potentiometer (R
Figure 1. Detailed Potentiometer Block Diagram
IF WCR = 00[H] THEN R
IF WCR = FF[H] THEN R
One of Two Potentiometers
FROM INTERFACE
SERIAL DATA PATH
CIRCUITRY
W
W
= R
= R
L
REGISTER 0
REGISTER 2
6
H
H
(DR0)
(DR2)
and R
L
inputs).
8
REGISTER 1
REGISTER 3
MODIFIED SCL
(DR1)
(DR3)
X9269
UP/DN
8
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper
(R
switch may be turned on at a time.
These switches are controlled by a Wiper Counter
Register (WCR). The 8-bits of the WCR (WCR[7:0])
are decoded to select, and enable, one of 256
switches (See Table 1).
The WCR may be written directly. These Data
Registers can the WCR can be read and written by the
host system.
Power-up and Down Requirements.
There are no restrictions on the power-up or power-
down conditions of V
the potentiometer pins provided that V
more positive than or equal to V
V
always in effect.
UP/DN
CLK
CC
PARALLEL
BUS
INPUT
SERIAL
BUS
INPUT
W
REGISTER
COUNTER
) output. Within each individual array only one
INC/DEC
≥ V
WIPER
LOGIC
(WCR)
H
, V
L
, V
W
C
O
U
N
T
E
R
D
E
C
O
D
E
. The V
CC
CC
and the voltages applied to
ramp rate specification is
H
, V
L
R
R
R
, and V
H
L
W
CC
is always
April 17, 2007
W
FN8173.4
, i.e.,