ISL24201_14 Datasheet, PDF (1/12 Pages) Intersil Corporation – Programmable VCOM Calibrator with EEPROM

Programmable V_COM Calibrator with EEPROM
ISL24201
Features
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 R₁ and R₂. 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 I²C 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.
• 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, I²C 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
3.3V
VDD
AVDD
MICRO-
CONTROLLER
I²C
PORT
I/O PIN
5
2
6
SDA
7
SCL
3
WP
ISL24201
1
OUT
8
SET
4
R1
R2
RSET
EL5411T
LCD PANEL
VCOM
FIGURE 1. APPLICATION SHOWING ISL24201 WITH A BUFFER AMPLIFIER
December 9, 2010
1
FN7586.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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