X9C103 INTERSIL [Intersil Corporation], X9C103 Datasheet - Page 2

• Manufacturer Part Number: X9C103
• Description: DIGITAL POTENTIOMETERS
• Manufacturer: INTERSIL [Intersil Corporation]

DCP Structure
DCP
overview
2 | www.intersil.com/DCPs-DCCs
Digital Control
Digital control allows the user to select each
switch in a “make before break” mode,
transferring the potential to the wiper.
CLOCK
DATA
1
DCP oVerView
WhAT IS A DCP?
Digitally Controlled Potentiometers are integrated circuits incorporating a resistor ladder with its associated registers, non-
volatile or volatile memory, and a digital interface providing direct communication between a host and both the resistor
ladder and memory.
iNterSil
DIGITAL POTENTIOMETERS
ADVANtAgeS of DCP vs. DeViCeS with SimilAr fuNCtioNS
Digital Control
I
Pushbutton
2
Output Setting
C, SPI, Up/Down,
Flexibility of
Advantage
Advantage
Reliability
Terminals
Power-up
Power-up
Interface
Control
Output
Digital
Size
SeleCtioN guiDe
8
Not susceptible to mechanical vibration & higher
tolerance to environmental factors.
DCPs with EEPROM will store setting until user
changes the value in memory (~100k to 1M
times).
Digital control - reduced manufacturing costs and
enables factory automation
Typically Smaller
3 terminals allow use as either voltage divider
or variable resistor. Also allows user to change
voltage at terminal ends.
Non-volatile DCPs have EEPROM where a user
can store power-up settings.
Multiple Choices: I
resistor ladder
The resistor array is comprised of individual resistors
connected in series. There are electronic switches (taps)
at each resistor junction, which have a common output
node called a wiper (VW/RW). Each physical end of the
array is described as a terminal and referred to as VH/
RH and VL/RL, and the resistance between the terminals
is referred to as R
+
R
Resistor Ladder
Resolution: 4-bit to 10-bit
R
TOTAL
TOTAL
2
C, SPI, U/D, Push-button
: 1kΩ to 100kΩ
DCP
DCP
TOTAL
.
TAP 128
TAP 127
TAP 2
TAP 1
Only one
closes at
V
a time
V
V
H
W
L
/R
/R
/R
H
+
L
W
Have moving parts, so can be more sensitive to
vibration, humidity, etc.
If glue is used to prevent wiper movement, the
device setting cannot be changed.
Manual control – increases setup time and
accuracy is reliant on technician
Typically Larger
Terminals are usually fixed rail to rail. No flexibility
to change between I
Output typically has default settings like Volatile
DCPs.
Primarily I
Register Store
Non-volatile: E
Volatile: RAM
2
C or SPI
Mechanical Potentiometer
register Store
DCP wiper position is stored in a
register. When power is reset, a volatile
DCP typically sets the wiper position to
midscale or zero-scale at power-up. When
the power is cycled for a nonvolatile DCP,
the last value stored in the EEPROM
register is recalled, which loads the initial
wiper value during power-up.
ACCESS CONTROL REGISTER (ACR)
DCP = Digitally Controlled Potentiometer
tap = Switch position on resistor string
r
wiper (Vw/rw) = DCP output node
2
totAl
VOL
PROM
OUT
= Total Resistance
SHDN
DAC
and V
WIP
OUT
=
.
0
TSSOP, SC-70,
SOT-23, µTQFN
0
DCP
0
0
0