1
Programmable V
COM
Calibrator with EEPROM
ISL24201
The ISL24201 provides an 8-bit programmable current sink that
is used in conjunction with an external voltage divider and buffer
amplifier to generate a voltage source that is positioned between
the analog supply voltage and ground. The current sink’s
resolution is controlled by an external resistor, R
SET
, and the
span of the V
COM
voltage is controlled by the voltage divider
resistor ratio and the source impedance of R
1
and R
2
. This
device has an 8-bit data register and 8-bit EEPROM for storing a
volatile and a permanent value for its output. The ISL24201 has
an I
2
C bus interface that is used to read and write to its registers
and EEPROM. At power-up the EEPROM value is transferred to
the data register and output.
The ISL24201 is available in an 8 Ld 3mm x 3mm TDFN
package. This package has a maximum height of 0.8mm for very
low profile designs. The ambient operating temperature range is
-40°C to +85°C
.
Features
• 8-bit, 256-Step, Adjustable Sink Current Output
• 4.5V to 18V Analog Supply Voltage Operating Range
• 2.25V to 3.6V Logic Supply Voltage Operating Range
• 400kHz, I
2
C Interface
• On-Chip 8-Bit EEPROM
• Output Guaranteed Monotonic Over-Temperature
• Pb-free (RoHS-compliant)
Applications
•LCD Panel V
COM
Generator
• Electrophoretic Display V
COM
Generator
• Resistive Sensor Driver
• Low Power Current Loop
Related Literature
• See AN1621 for ISL24201 Evaluation Board Application Note
“ISL24201IRTZ-EVALZ Evaluation Board User Guide”
Typical Application
MICRO-
CONTROLLER
ISL24201
SCL
SDA
WP
OUT
SET
3.3V
V
DD
A
VDD
8
5
4
3
7
6
1
2
R
SET
R
1
R
2
LCD PANEL
V
COM
I
2
C
PORT
I/O PIN
EL5411T
FIGURE 1. APPLICATION SHOWING ISL24201 WITH A BUFFER AMPLIFIER
December 9, 2010
FN7586.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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