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ISL24212IRTZ

P1-P3P4-P6P7-P9P10-P12
1
Programmable V
COM
Calibrator with EEPROM and
Output Buffer
ISL24212
The ISL24212 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
ISL24212 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 VCOM_OUT pin.
The ISL24212 also features an integrated, wide-bandwidth, high
output drive buffer amplifier that can directly drive the V
COM
input of an LCD panel.
The ISL24212 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
• Adjustable 8-bit, 256-Step, Current Sink Output
•60MHz V
COM
Buffer/Amplifier
• 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 10 Ld TDFN (3x3x0.8mm max)
Applications
•LCD Panel V
COM
Generator
• Electrophoretic Display V
COM
Generator
Related Literature
• See Application Note “ISL24212IRTZ-EVALZ Evaluation Board
User Guide” (Coming Soon)
MICRO-
CONTROLLER
ISL24212
CE
CTL
DVR_OUT
SET
V
DD
AV
DD
9
6
5
8
7
2
3
R
SET
R
1
R
2
LCD PANEL
V
COM
I/O PIN
VCOM_OUT
10
IN
N
1
I/O PIN*
* 0, 1, TRISTATE
FIGURE 1. TYPICAL ISL24212 APPLICATION
March 15, 2011
FN7590.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|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.
ISL24212
2
FN7590.0
March 15, 2011
Block Diagram
Pin Configuration
ISL24212
(10 LD TDFN)
TOP VIEW
FIGURE 2. BLOCK DIAGRAM OF THE ISL24212
GND
DIGITAL
INTERFACE
DAC
REGISTERS
8-Bit EEPROM
CTL
DNC
CE
AV
DD
SET
10
9
3
7
8
5
CS
DVR_OUT
2
1
Q1
A1
VCOM_OUT
IN
N
ANALOG DCP
AND
CURRENT SINK
V
COM
BUFFER
AMPLIFER
A2
UP/DOWN
COUNTER
6
V
DD
4
(*CONNECT THERMAL PAD TO GND)
IN
N
DVR_OUT
AV
DD
1
2
3
4
10
9
8
7
VCOM_OUT
SET
CE
CTL
EXPOSED
THERMAL
PAD*
6
V
DD
GND
5
DNC
Pin Descriptions
PIN
NAME
PIN
NUMBER FUNCTION
IN
N
1 Negative input of the op amp. To create a unity-gain V
COM
voltage buffer, connect this pin to the VCOM_OUT pin.
DVR_OUT 2 Current Sink Output. The sink current into the DVR_OUT (Digital Variable Resistor) pin is equal to the DAC setting times the maximum
adjustable sink current divided by 256. See the “SET” pin function description (pin 9) for setting the maximum adjustable sink
current.
AV
DD
3 High-Voltage Analog Supply. Bypass to GND with 0.1µF capacitor.
DNC 4 Do Not Connect to external circuitry. It is acceptable to ground this pin.
GND 5 Ground connection.
V
DD
6 Digital power supply input. Bypass to GND with 0.1µF capacitor.
CTL 7 Up/Down Control for internal counter and Internal EEPROM Programming Control Input. When CE is high:
A low-to-mid transition increments the 8-bit counter, adding 1 to the DAC setting, increasing the DVR_OUT sink current, and
lowering the divider voltage at the DVR_OUT pin.
A high-to-mid transition decrements the 8-bit counter, subtracting 1 from the DAC setting, decreasing the DVR_OUT sink current,
and increasing the divider voltage at the DVR_OUT pin.
To program the EEPROM, take this pin to >4.9V (see “CTL EEPROM Programming Signal Time” in the “Electrical Specification”
table on page 5 for details). Float when not in use.
ISL24212
3
FN7590.0
March 15, 2011
CE 8 Counter Enable Pin. Connect CE to V
DD
to enable adjustment of the output sink current. Float or connect CE to GND to prevent
further adjustment or programming (Note: the CE pin has an internal 500nA pull-down sink current). The EEPROM value will be
copied to the register on a V
OH
to V
OL
transition.
SET 9 Maximum Sink Current Adjustment Point. Connect a resistor from SET to GND to set the maximum adjustable sink current of the
DVR_OUT pin. The maximum adjustable sink current is equal to (AV
DD
/20) divided by R
SET
.
VCOM_OUT 10 Output of the buffer amplifier
PAD - Thermal pad should be connected to system ground plane to optimize thermal performance.
Pin Descriptions (Continued)
PIN
NAME
PIN
NUMBER FUNCTION
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING INTERFACE
TEMP RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL24212IRTZ 4212 COUNTER -40 to +85 10 Ld 3x3 TDFN L10.3x3A
ISL24212IRTZ-EVALZ Evaluation Board
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page ISL24212
. For more information on MSL please see techbrief TB363.
P1-P3P4-P6P7-P9P10-P12

ISL24212IRTZ

Mfr. #:
Buy ISL24212IRTZ
Manufacturer:
Renesas / Intersil
Description:
LCD Gamma Buffers ISL24212IRTZ VCOM DR VR + CLBTR UP/DN
Lifecycle:
New from this manufacturer.
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