参数资料
| 型号： | ISL24211IRTZ |
| 厂商： | Intersil |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC VCOM CALIBRATOR I2C 10TDFN |
| 标准包装： | 100 |
| 类型： | 校准器 |
| 应用： | LCD 驱动器，基准电压发生器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN（3x3） |
| 包装： | 管件 |
ISL24211
6
FN7585.0
February 23, 2011
Application Information
LCD panels have a VCOM (common voltage) that must be precisely
circuit using a mechanical potentiometer, and the equivalent
circuit replacement using the ISL24211. Having a digital I2C
interface enables automatic, digital flicker minimization during
production test and alignment. After programming, the I2C
interface has no further use therefore, the ISL24211 automatically
powers up with the correct VCOM voltage programmed previously.
The ISL24211 uses a digitally controllable potentiometer (DCP),
with 256 steps of resolution (see Figure 4) to change the current
drawn at the DVR_OUT pin, which then changes the voltage
DVR_OUT voltage is then buffered by A2 to generate a buffered
output voltage at the VCOM_OUT pin, capable of directly driving the
VCOM input of an LCD panel. The amount of current sunk is
controlled by the setting of the DCP, which is recalled at power-up
from the ISL24211’s internal EEPROM. The EEPROM is typically
programmed during panel manufacture. As noted in the
Electrical Specifications on page 4, the ISL24211 requires a
minimum AVDD voltage of 10.8V for EEPROM programming, but
will work in normal operation (with no EEPROM programming)
down to 4.5V.
DCP (Digitally Controllable Potentiometer)
The DCP controls the voltage that ultimately controls the SET
current. Figure 4 shows the relationship between the register
value and the DCP’s tap position. Note that a register value of 0
selects the first step of the resistor string. The output voltage of
the DCP is given in Equation 1:
Output Current Sink
Figure 5 shows the schematic of the DVR_OUT current sink. The
combination of amplifier A1, transistor Q1, and resistor RSET
forms a voltage-controlled current source, with the voltage
determined by the DCP setting.
The external RSET resistor sets the full-scale (maximum) sink current
that can be pulled from the DVR_OUT node. The relationship
FIGURE 3. MECHANICAL ADJUSTMENT REPLACEMENT
DVR_OUT
SET
ISL24211
R1
R2
AVDD
VCOM
IOUT
VDD
RSET
RA
RC
AVDD
VCOM
RB
R1 = RA
R2 = RB+RC
RSET = RARB + RARC
20RB
INN
VCOM_OUT
VDCP
RegisterValue 1
+
256
---------------------------------------------------
AVDD
20
--------------
=
(EQ. 1)
FIGURE 4. SIMPLIFIED SCHEMATIC OF DCP
AVDD
19R
R
0
1
2
255
254
253
252
251
REGISTER
VALUE
AVDD
20
VDCP
FIGURE 5. CURRENT SINK CIRCUIT
AVDD
RSET
VDCP
SET
DVR_OUT
AVDD
IOUT
R1
R2
VSAT
VSET = VDCP = IOUT * RSET
Q1
A1
VOUT
VCOM_OUT
INN
GND
A2
IDVR_OUT
IDVROUT
VDCP
RSET
-------------
RegisterValue 1
+
256
---------------------------------------------------
AVDD
20
--------------
1
RSET
-------------
==
(EQ. 2)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL24211IRTZ-EVALZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM and Output Buffer |
| ISL24211IRTZ-T13 | 功能描述:LCD Gamma缓冲器 ISL24211IRTZFREE VCO M DRVR + VCOM CLBTR RoHS:否 制造商:Maxim Integrated 输入补偿电压: 转换速度: 电源电压-最大:20 V 电源电压-最小:9 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-38 封装:Tube |
| ISL24212 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM and Output Buffer |
| ISL24212IRTZ | 功能描述:LCD Gamma缓冲器 ISL24212IRTZ VCOM DR VR + CLBTR UP/DN RoHS:否 制造商:Maxim Integrated 输入补偿电压: 转换速度: 电源电压-最大:20 V 电源电压-最小:9 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-38 封装:Tube |
| ISL24212IRTZ-EVALZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM and Output Buffer |
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