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參數(shù)資料
| 型號(hào)： | MAX1512 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | EEPROM-Programmable TFT VCOM Calibrator |
| 中文描述： | EEPROM可編程TFT VCOM校準(zhǔn)器 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 682K |
| 代理商： | MAX1512 |
M
EEPROM-Programmable TFT VCOM Calibrator
6
_______________________________________________________________________________________
Detailed Description
The MAX1512 is a solid-state alternative to mechanical
potentiometers used for adjusting the LCD backplane
voltage (VCOM) in TFT LCD displays. The MAX1512
attaches to an external resistive voltage-divider and
sinks a programmable current (I
OUT
), which sets the
VCOM level (Figure 1). An internal 7-bit DAC controls
the sink current and allows the user to increase or
decrease the VCOM level (Figure 2). The DAC is ratio-
metric relative to AVDD 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 single-wire
interface between the LCD panel and the programming
circuit adjusts the DAC, programs the EEPROM, and
provides programming power.
The resistive voltage-divider and the AVDD supply set
the maximum value of VCOM. The MAX1512 sinks cur-
rent from the voltage-divider to reduce the VCOM level.
The external resistor R
SET
sets the full-scale sink cur-
rent and the minimum value of VCOM.
Pin Description
PIN
NAME
FUNCTION
1
OUT
Adjustable Sink-Current Output. OUT connects to the resistive voltage-divider between AVDD and GND that
sets the VCOM voltage. I
OUT
lowers the divider voltage by an adjustable amount. See the SET pin
description.
2
3
4
5
AVDD
N.C.
GND
V
DD
High-Voltage Analog Supply. Connects to the panel source-driver supply rail.
No Connect. Not internally connected.
Ground
Supply Input. +2.6V to +3.6V input range.
6
CTL
VCOM Adjustment and EEPROM Programming Control. CTL sets the internal DAC code and programs the
EEPROM. A pulse-control method is used to adjust the VCOM level. See the
VCOM Adjustment (CTL)
section
.
To program the DAC setting into the EEPROM as the power-on default, drive CTL to the EEPROM
programming voltage using the correct timing and voltage ramp rates. See the
EEPROM Programming
(CTL)
section
.
7
CE
Control Interface Enable. Connect CE to V
DD
to enable the CTL input. Connect CE to GND to disable the
CTL input and reduce the supply current.
8
SET
Full-Scale Sink-Current Adjustment Input. Connect a resistor, R
SET
, from SET to GND to set the full-scale
adjustable sink current. The full-scale adjustable sink current is equal to:
I
OUT
is equal to the current through R
SET
.
R
SET
20
CE
CTL
AVDD
R
SET
25k
OUT
R2
245k
R1
200k
VCOM
5V
SET
GND
V
DD
V
DD
3V
AVDD
10V
MAX1512
Figure 1. Standard Application Circuit
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| MAX15125EWJ+T | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE DDR LINEAR REGULATOR - Tape and Reel |
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| MAX1512ETA+T | 功能描述:LCD Gamma緩沖器 EEPROM-Prog TFT VCOM Calibrator RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
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