ISL24202_14 Datasheet, PDF (1/12 Pages) Intersil Corporation – Programmable VCOM Calibrator with EEPROM

Programmable V_COM Calibrator with EEPROM
ISL24202
Features
The ISL24202 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
ISL24202 has an 8-bit data register and 8-bit EEPROM for storing
both a volatile and a permanent value for its output, accessible
through a single up/down counter interface pin (CTL). After the
part is programmed with the desired V_COM value, the Counter
Enable pin (CE) can be grounded to prevent further changes. On
every power-up the EEPROM contents are automatically
transferred to the data register, and the pre-programmed output
voltage appears at the V_OUT pin.
The ISL24202 can be used with a high output drive buffer
amplifier, which allows it to directly drive the V_COM input of an
LCD panel.
The ISL24202 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.
• Adjustable 8-Bit, 256-Step, Current Sink Output
• On-Chip 8-Bit EEPROM
• Up/Down Counter Interface
• Guaranteed Monotonic Over-Temperature
• 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
• Pb-free (RoHS-Compliant)
• Ultra-Thin 8 Ld TDFN (3 x 3 x 0.8mm Max)
Applications
• LCD Panel V_COM Generator
• Electrophoretic Display V_COM Generator
Related Literature
• See AN1633 for ISL24202 Evaluation Board Application Note
“ISL24202IRTZ-EVALZ Evaluation Board User Guide” (Coming
Soon)
VDD
AVDD
MICRO-
CONTROLLER
I/O PIN*
I/O PIN
5
2
6
CTL
7
CE
ISL24202
R₁
1
OUT
R₂
LCD PANEL
V_COM
* 0, 1, TRI-STATE
8
SET
EL5411T
RSET
4
FIGURE 1. TYPICAL ISL24202 APPLICATION
March 15, 2011
1
FN7587.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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