ISL24211_14 Datasheet, PDF (1/12 Pages) Intersil Corporation – Programmable VCOM Calibrator with EEPROM and Output Buffer

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 R₁ and R₂, 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 I²C
interface to read and write to the register and EEPROM. After the
part is programmed, the I²C 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, I²C 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
3.3V
VDD
AVDD
MICRO-
CONTROLLER
I²C
PORT
I/O PIN
February 23, 2011
1
FN7585.0
7
SDA
8
SCL
4
WP
6
3
2
DVR_OUT
ISL24211
1
INN
10
VCOM_OUT
9
SET
5
R₁
R₂
R_SET
FIGURE 1. TYPICAL ISL24211 APPLICATION
LCD PANEL
V_COM
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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