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PDF ISL24201 Data sheet ( Hoja de datos )
| Número de pieza | ISL24201 | |
| Descripción | Programmable Vcom Calibrator | |
| Fabricantes | Intersil | |
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Programmable VCOM 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, RSET, and the
span of the VCOM 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 VCOM Generator
• Electrophoretic Display VCOM 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
52
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
FN7586.1
1
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. 2010. 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.
1 page  
ISL24201
Electrical Specifications Test Conditions: VDD = 3.3V, AVDD = 18V, RSET = 5kΩ, R1 = 10kΩ, R2 = 10kΩ, (See Figure 5); unless otherwise
specified. Typicals are at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
SYMBOL
I2C TIMING
PARAMETER
TEST CONDITIONS
MIN
(Note 6)
MAX
TYP (Note 6) UNITS
fCLK
tSCH
tSCL
tDSP
tSDS
tSDH
tBUF
tSTS
tSTH
tSPS
I2C Clock Frequency
I2C Clock High Time
I2C Clock Low Time
I2C Spike Rejection Filter Pulse Width
I2C Data Set Up Time
I2C Data Hold Time
I2C Time Between Stop and Start
I2C Repeated Start Condition Set-up
I2C Repeated Start Condition Hold
I2C Stop Condition Set-up
400 kHz
0.6 µs
1.3 µs
0 50 ns
250 ns
250 ns
200 µs
0.6 µs
0.6 µs
0.6 µs
CSDA SDA Pin Capacitance
10 pF
CS SCL Pin Capacitance
10 pF
tW EEPROM Write Cycle Time
100 ms
NOTE:
6. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
Application Information
The ISL24201 provides the ability to adjust the VCOM voltage
during production test and alignment, under digital control, to
minimize the flicker of an LCD panel. A digitally controlled
potentiometer (DCP), with 256 steps of resolution, adjusts the sink
current of the OUT pin. Figure 3 shows the VCOM adjustment using
a mechanical potentiometer circuit and the equivalent circuit
replacement with the ISL24201.
The output is connected to an external voltage divider, as shown in
Figure 3, so that the ISL24201 will have the ability to reduce the
voltage on the output by increasing the OUT pin sink current. The
amount of current sunk is controlled by the I2C serial interface.
AVDD
R1 = RA
R2 = RB+RC
RSET = RARB + RARC
20RB
RA
RB
RC
VDD
AVDD
AVDD
VCOM
ISL24201
or
ISL24202
SET
IOUT
OUT
RSET
R1
R2
VCOM
FIGURE 3. MECHANICAL ADJUSTMENT REPLACEMENT
5 FN7586.1
December 9, 2010
5 Page 
ISL24201
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make
sure you have the latest revision.
DATE
REVISION
CHANGE
12/9/10
FN7586.1 On page 5, corrected MIN spec for “tBUF” from 125µs to 200µs.
12/1/10
FN7586.0 Initial Release.
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.
Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
complete list of Intersil product families.
*For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page
on intersil.com: ISL24201
To report errors or suggestions for this datasheet, please go to www.intersil.com/askourstaff
FITs are available from our website at http://rel.intersil.com/reports/sear
For additional products, see www.intersil.com/product_tree
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
11 FN7586.1
December 9, 2010
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