1
Programmable V
COM
Calibrator with EEPROM and
Output Buffer
ISL24211
The ISL24211 is an 8-bit programmable current sink that can be
used in conjunction with an external voltage divider to generate a
voltage source (V
COM
) positioned between the analog supply
voltage and ground. The current sink’s full-scale range is
controlled by an external resistor, R
SET
. With the appropriate
choice of external resistors R
1
and R
2
, the V
COM
voltage range
can be controlled between any arbitrary voltage range. The
ISL24211 has an 8-bit data register and 8-bit EEPROM for storing
both a volatile and a permanent value for its output, with an I
2
C
interface to read and write to the register and EEPROM. After the
part is programmed, the I
2
C interface is no longer needed; on
power-up the EEPROM contents are automatically transferred to
the data register, and the pre-programmed output voltage
appears on the VCOM_OUT pin.
The ISL24211 also features an integrated, wide-bandwidth, high
output drive buffer amplifier that can directly drive the V
COM
input of an LCD panel.
The ISL24211 is available in an 10 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
• 60MHz V
COM
Buffer/Amplifier
• 4.5V to 19.0V Analog Supply Range for Normal Operation
(10.8V Minimum Analog Supply Voltage for Programming)
• 2.25V to 3.6V Logic Supply Voltage Operating Range
• 400kHz, I
2
C Interface
• On-Chip 8-Bit EEPROM
• Guaranteed Monotonic Over-Temperature
• Compatible with applications using the 7-bit ISL45041
• Pb-free (RoHS-compliant)
• Ultra-Thin 10 Ld TDFN (3 x 3 x 0.8mm max)
Applications
•LCD Panel V
COM
Generator
• Electrophoretic Display V
COM
Generator
Related Literature
•AN1627 “ISL24211IRTZ-EVALZ Evaluation Board User Guide”
Typical Application
MICRO-
CONTROLLER
ISL24211
SCL
SDA
WP
DVR_OUT
SET
3.3V V
DD
AV
DD
9
6
5
4
8
7
2
3
R
SET
R
1
R
2
LCD PANEL
V
COM
I
2
C
PORT
I/O PIN
VCOM_OUT
10
IN
N
1
FIGURE 1. TYPICAL ISL24211 APPLICATION
February 23, 2011
FN7585.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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|Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
