|
|
PDF MAX1512 Data sheet ( Hoja de datos )
| Número de pieza | MAX1512 | |
| Descripción | EEPROM-Programmable TFT VCOM Calibrator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX1512 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
19-2911 Rev 2; 8/04
EVAALVUAAILTAIOBNLEKIT
EEPROM-Programmable TFT VCOM Calibrator
General Description
The MAX1512 is a programmable VCOM-adjustment
solution for thin-film transistor (TFT) liquid-crystal displays
(LCDs). The MAX1512 simplifies the labor-intensive
VCOM-adjustment process and replaces mechanical
potentiometers, which significantly reduces labor costs,
increases reliability, and enables automation.
The MAX1512 attaches to an external resistive voltage-
divider 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 IC features a single-wire interface between the
LCD panel and the programming circuit. The single-
wire interface delivers both programming power and
DAC-adjustment commands to minimize changes to
panel connectors and production equipment. The
MAX1512 is available in an 8-pin 3mm x 3mm TDFN
package. A complete evaluation kit is available to sim-
plify evaluation and production development.
LCD Panels
Notebook Computers
Monitors
LCD TVs
Applications
Pin Configuration
TOP VIEW
OUT 1
AVDD 2
N.C. 3
GND 4
MAX1512
TDFN
8 SET
7 CE
6 CTL
5 VDD
Features
♦ 7-Bit Adjustable Sink-Current Output
♦ Resistor-Adjustable Full-Scale Range
♦ Guaranteed Monotonic Output Over Operating
Range
♦ Single-Wire Adjustment and Programming*
♦ EEPROM Stores VCOM Setting
♦ Interface Enable/Disable Control (CE)
♦ 2.6V to 3.6V Logic Supply-Voltage Operating
Range (VDD)
♦ 4.5V to 20V Analog Supply-Voltage Range (VAVDD)
♦ VDD UVLO Protection
♦ 8-Pin 3mm x 3mm TDFN (0.8mm max)
Ordering Information
PART
MAX1512ETA
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 8 TDFN 3mm x 3mm
Typical Operating Circuit
VDD
VDD
CE AVDD
MAX1512
OUT
CTL
SET
GND
AVDD
R1
R2
RSET
VCOM
*Patent Pending.
________________________________________________________________ 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
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VDD = 3V, VAVDD = 10V, VOUT = 5V, RSET = 24.9kΩ, TA = +25°C, DAC half scale, unless otherwise noted.)
TOTAL UNADJUSTED ERROR
vs. DAC SETTING
7
RSET = 25kΩ
6
5
4
RSET = 100kΩ
3
2
1
0
0 16 32 48 64 80 96 112 128
DAC SETTING
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
INTEGRAL NONLINEARITY
vs. DAC SETTING
RSET = 100kΩ
RSET = 25kΩ
16 32 48 64 80 96 112 128
DAC SETTING
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
DIFFERENTIAL NONLINEARITY
vs. DAC SETTING
16 32 48 64 80 96 112 128
DAC SETTING
AVDD POWER-UP RESPONSE
MAX1512 toc11
COUT = 100pF
VAVDD
10V/div
0
VOUT
1V/div
VDD POWER-UP RESPONSE
MAX1512 toc12
COUT = 100pF
5V
VOUT
4V
10V
VAVDD
0
40µs/div
0
VDD
2V/div
0
40µs/div
VDD
2V/div
0
SINGLE LSB STEP-UP RESPONSE
MAX1512 toc13
COUT = 100pF
40µs/div
VOUT
5mV/div
2V
VCTL
0
SINGLE LSB STEP-DOWN RESPONSE
MAX1512 toc14
COUT = 100pF
VOUT
5mV/div
40µs/div
2V
VCTL
0
_______________________________________________________________________________________ 5
5 Page 
EEPROM-Programmable TFT VCOM Calibrator
Applications Information
The VCOM adjustment and the EEPROM programming
must be performed with an external programming cir-
cuit. Refer to the MAX1512 evaluation kit for a complete
programming circuit solution.
Use a circuit similar to the conceptual diagram shown
in Figure 8 to drive CTL. The accuracy of the program-
ming voltage (VPP) is critical for proper MAX1512 data
retention. The use of a comparator is recommended to
verify the correct programming voltage has been
reached. A complete design example of a CTL pro-
gramming circuit is presented in the MAX1512 evalua-
tion kit data sheet.
Electrostatic Discharge (CTL)
The CTL pin is exposed at the LCD panel connector and
is subject to electrostatic discharge (ESD). Often an RC
filter is used to improve an input’s resilience to ESD. If a
filter is added between the LCD panel connector and
CTL, ensure that the RC time constant is short enough to
avoid interfering with CTL pulses or the EEPROM pro-
gramming timing. An RC time constant less than 200µs
does not interfere with EEPROM programming.
Leakage Current (CTL)
The CTL pin is internally biased to VDD / 2, but it is sen-
sitive to leakage currents above 0.1µA. When CTL is
not driven, avoid leakage currents around the CTL pin.
Otherwise, reinforce the VDD / 2 set point with an exter-
nal resistive voltage-divider.
Layout Information
Use the following guidelines for good layout:
• Place the VCOM buffer and the R1/R2 voltage-
divider close to the OUT pin (Figure 1). Keep the
VCOM buffer and the R1/R2 voltage-divider close
to each other.
• Place RSET close to SET.
• In noisy environments, bypass capacitors may be
desired on VDD and/or VAVDD. Keep any bypass
capacitors close to the IC with short connections to
the pins.
Refer to the MAX1512 evaluation kit for an example of
proper board layout.
USER
INTERFACE
µC DAC
0 TO 2.5V
VPP VERIFY
REF
0 TO 15.5V
CTL
MAX1512
Figure 8. Conceptual Programming Circuit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1512.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX151 | 300kHz 10-Bit A/D Converter with Refrence and T/H |  Maxim Integrated |
| MAX1510 | Low-Voltage DDR Linear Regulator | Maxim Integrated Products |
| MAX15101 | Low-Dropout Linear Regulator | Maxim Integrated Products |
| MAX15102 | Low-Dropout Linear Regulator | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |