参数资料
| 型号： | MAX8738EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC CALIBR TFT VCOM 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 视频滤波器 |
| 应用： | LCD 显示器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
MAX8738
Detailed Description
The MAX8738 is a solid-state alternative to mechanical
potentiometers used for adjusting the LCD backplane
voltage (VCOM) in TFT LCD displays. The MAX8738
attaches to an external resistive voltage-divider and
sinks a programmable current (IOUT), which sets the
VCOM level (Figure 2). An internal 7-bit DAC controls
the sink current and allows the user to increase or
decrease the VCOM level (Figure 3). The DAC is ratio-
metric relative to VAVDD and is monotonic over all oper-
ating conditions. The user can store the DAC setting in
an internal EEPROM. On power-up, the EEPROM pre-
sets the DAC to the last stored setting. The 2-wire I2C
interface between the LCD panel and the programming
circuit adjusts the DAC and programs the EEPROM.
The resistive voltage-divider and the AVDD supply set
the maximum value of VCOM. The MAX8738 sinks cur-
rent from the voltage-divider to reduce the VCOM level.
The external resistor RSET sets the full-scale sink cur-
rent and the minimum value of VCOM.
Supply Voltages
AVDD and VDD
The MAX8738 has an internal linear regulator that gen-
erates a 3.6V VDD voltage from the AVDD supply volt-
age. The VDD voltage supplies power to the MAX8738
and should not be used for external loads. AVDD
accepts voltages from 4.5V to 20V. Bypass AVDD and
VDD to GND with a 0.1F capacitor each.
HV
The HV input provides the high voltage required to pro-
gram the EEPROM. The HV pin is typically connected to
the TFT LCD positive gate driver supply (VGON) supply.
VGON should be between 16.1V and 28V. EEPROM
programming is disabled when HV is below 15.6V (typ).
Bypass HV to GND with a 0.1F capacitor.
The EEPROM programming block is turned off when
the MAX8738 first powers up, and also immediately
after the EEPROM is programmed. When the EEPROM
programming block is off, the HV supply current is less
than 1A.
After the MAX8738 receives any command that
changes the DAC value, the EEPROM programming
block is enabled, and the HV supply current increases
to 15A (typ). During the programming of the EEPROM,
the HV supply current may draw up to 60A (max).
Setting the VCOM Adjustment
Range (RSET)
The external resistive voltage-divider sets the maximum
value of the VCOM adjustment range. RSET sets the
full-scale sink current, IOUT, which determines the mini-
mum value of the VCOM adjustment range. Large RSET
values increase resolution but decrease the VCOM
adjustment range. Calculate R1, R2, and RSET using
the following procedure:
EEPROM-Programmable TFT VCOM
Calibrator with I2C Interface
8
_______________________________________________________________________________________
MAX8738
SDA
SCL
VDD
AVDD
RSET
SET
GND
OUT
VGON
HV
R2
R1
VCOM
AVDD
EEPROM
BLOCK
I2C
CONTROL
INTERFACE
DAC
19R
R
7
+3.3V
LINEAR
REGULATOR
I2C
BUS
Figure 3. Simplified Functional Diagram
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