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PDF MAX8738 Data sheet ( Hoja de datos )
| Número de pieza | MAX8738 | |
| Descripción | EEPROM-Programmable TFT VCOM Calibrator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX8738 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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19-3624; Rev 0; 3/05
EVAALVUAAILTAIOBNLEKIT
EEPROM-Programmable TFT VCOM
Calibrator with I2C Interface
General Description
The MAX8738 is an I2C-programmable VCOM-adjust-
ment solution for thin-film transistor (TFT) liquid-crystal
displays (LCDs). The MAX8738 simplifies the labor-inten-
sive VCOM-adjustment process and replaces mechani-
cal potentiometers, which significantly reduces labor
costs, increases reliability, and enables automation.
The MAX8738 attaches to an external resistive voltage-
www.DataSheedt4iUv.icdoemr and sinks a programmable current to set the
VCOM voltage level. An internal 7-bit digital-to-analog
converter (DAC) controls the sink current. The DAC is
ratiometric relative to AVDD and is guaranteed to be
monotonic over all operating conditions. This VCOM
calibrator IC includes an EEPROM to store the desired
VCOM voltage level. The EEPROM can be programmed
repeatedly, giving TFT LCD manufacturers the flexibility
to calibrate the display panel as many times as the
manufacturing process requires.
The MAX8738 features a 2-wire I2C* interface for DAC-
adjustment commands and EEPROM programming.
The interface utilizes the existing I2C bus on the LCD
panel connector so no additional panel connector pins
are required. The MAX1512 is a similar product with a
1-wire interface and is recommended for applications
with no existing I2C interface.
The MAX8738 is available in an 8-pin µMAX® package.
A complete evaluation kit is available to simplify evalua-
tion and production development.
Features
♦ 7-Bit Adjustable Sink-Current Output
♦ Resistor-Adjustable, Full-Scale Range
♦ Guaranteed Monotonic Output Over Operating
Range
♦ 2-Wire I2C Interface
♦ EEPROM Stores VCOM Setting
♦ 4.5V to 20V Analog Supply Voltage Range
(VAVDD)
♦ 60µA (max) AVDD Supply Current
♦ 16.1V to 28V EEPROM Programming Supply
Voltage Range (VHV)
♦ <1µA HV Supply Current (Not in Program Mode)
♦ 8-Pin µMAX
Ordering Information
PART
TEMP RANGE
MAX8738EUA
-40oC to +85oC
MAX8738EUA+
-40oC to +85oC
+Denotes lead-free package.
PIN-PACKAGE
8 µMAX
8 µMAX
LCD Panels
Notebook Computers
Display Products
LCD TVs
Applications
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configuration
TOP VIEW
OUT 1
AVDD 2
VDD 3
GND 4
MAX8738
8 SET
7 SCL
6 SDA
5 HV
µMAX
Typical Operating Circuit
+3.3V
VGON
VDD HV AVDD
AVDD
SDA
I2C
BUS
MAX8738
R1
SCL OUT
GND SET
RSET
R2
VCOM
Purchase of I2C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms
to the I2C Standard Specification as defined by Philips.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
EEPROM-Programmable TFT VCOM
Calibrator with I2C Interface
Typical Operating Characteristics
(VAVDD = 9V, VHV = 18V, RSET = 24.9kΩ, TA = +25°C, unless otherwise noted.)
AVDD SUPPLY CURRENT vs. TEMPERATURE
25
VAVDD = 9V
www.DataSheet4U.com
1000
100
FULL-SCALE IOUT vs. RSET
VAVDD = 20V
20
VAVDD = 4.5V
10
1
IOUT SINK-CURRENT ERROR vs. VAVDD
0.5
0.4
0.3
0.2
0.1
15
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
0.1
0.1
1 10 100
RSET (kΩ)
1000
0
4 8 12 16 20
VAVDD (V)
IOUT SINK-CURRENT ERROR vs. VOUT
0.5
0.4
0.3
0.2
0.1
0
0.1
1
VOUT (V)
VAVDD = 9V
10
IOUT SINK-CURRENT ERROR
vs. TEMPERATURE
0.5
0.4
0.3
0.2
0.1
0
-40 -20
VAVDD = 9V
0 20 40 60 80 100
TEMPERATURE (°C)
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
TOTAL UNADJUSTED ERROR
vs. DAC SETTING
16 32 48 64 80 96 112 128
DAC SETTING
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
INTEGRAL NONLINEARITY
vs. DAC SETTING
16 32 48 64 80 96 112 128
DAC SETTING
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
DIFFERENTIAL NONLINEARITY
vs. DAC SETTING
16 32 48 64 80 96 112 128
DAC SETTING
_______________________________________________________________________________________ 5
5 Page 
EEPROM-Programmable TFT VCOM
Calibrator with I2C Interface
Slave Address
After generating a START condition, the bus master
transmits the slave address consisting of a 7-bit device
code (0b0101111 or 5Eh) for the MAX8738. Since the
MAX8738 is a write-only device, the eighth bit of the
slave address is zero. The MAX8738 monitors the bus
for its corresponding slave address continuously. It
generates an acknowledge bit when it recognizes its
www.DataSheeta4dUd.croemss.
SDA Data Valid
The state of the data line represents valid data when,
after a START condition, the data line is stable for the
duration of the HIGH period of the clock signal. The
data on the line must be changed during the LOW peri-
od of the clock signal. There is one clock pulse per bit
of data.
Acknowledge
Each receiving device, when addressed, is obliged to
generate an acknowledge after the reception of each
byte. The master device must generate an extra clock
pulse that is associated with this acknowledge bit. The
device that acknowledges has to pull down the SDA
line during the acknowledge clock pulse so that the
SDA line is stable LOW during the HIGH period of the
acknowledge-related clock pulse. Of course, setup and
hold times must be taken into account. See Figure 7.
The MAX8738 does not acknowledge the program
EEPROM command (AAh) if HV is below 15.6V (typ) or
if the MAX8738 is not in program mode.
The MAX8738 does not acknowledge any command
while an internal programming cycle is in progress.
Once the internally timed EEPROM write cycle has
started, acknowledge polling can be initiated. This
involves repeatedly sending a 55h command. Only if
the internal write cycle has completed does the
MAX8738 acknowledge the command.
DATA OUTPUT
BY MASTER
DATA OUTPUT
BY MAX8738
D7
SCL FROM
MASTER
S
START
CONDITION
1
CLK1
Figure 7. I2C Bus Acknowledge
D6
2
CLK2
D0
NOT ACKNOWLEDGE
ACKNOWLEDGE
8
CLK8
9
CLK9
ACKNOWLEDGE
CLOCK PULSE
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX8738.PDF ] | |
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