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參數(shù)資料
| 型號(hào)： | ISL24202IRTZ |
| 廠(chǎng)商： | Intersil |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC PROG 8BIT VCOM CALIBRTR 8TDFN |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類(lèi)型： | 校準(zhǔn)器 |
| 應(yīng)用： | LCD 驅(qū)動(dòng)器，基準(zhǔn)電壓發(fā)生器 |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-WDFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 8-TDFN（3x3） |
| 包裝： | 管件 |
ISL24202
7
FN7587.0
March 15, 2011
Determination of RSET
The ultimate goal for the ISL24202 is to generate an adjustable
voltage between two endpoints, VCOM_MIN and VCOM_MAX, with
a fixed power supply voltage, AVDD. This is accomplished by
choosing the correct values for RSET, R1 and R2. The exact value
of RSET is not critical. Values from 1k to more than 100k will
work under most conditions. The following expression calculates
the minimum RSET value:
Note that this is the absolute minimum value for RSET. Larger
RSET values reduce quiescent power, since R1 and R2 are
proportional to RSET. The ISL24202 is tested with a 5kΩ RSET.
Determination of R1 and R2
With AVDD, VCOM(MIN) and VCOM(MAX) known and RSET chosen
per the above requirements, R1 and R2 can be determined using
Final Transfer Function
The voltage at the OUT pin can be calculated from Equation 8:
With external amplifier A2 in the unity-gain configuration,
VOUT =VCOM.
Example
As an example, suppose the AVDD supply is 15V, the desired
VCOM_MIN = 6.5V and the desired VCOM_MAX = 8.5V. RSET is
arbitrarily chosen to be 7.5kΩ.
First, verify that our chosen RSET meets the minimum
requirement described in Equation 5:
value for these conditions.
Output Voltage Span Calculation
It is also possible to calculate VCOM(MIN) and VCOM(MAX) from the
existing resistor values.
VCOM_MIN occurs when the greatest current, IOUT(MAX), is drawn
from the middle node of the R1/R2 divider. Substituting
RegisterValue = 255 into Equation 8 gives the following:
Similarly, RegisterValue = 0 for VCOM(MAX):
span of VCOM can be found:
RSET MIN
()
AVDD
16
--------------
VOUT MIN
()
AVDD
20
--------------
–
------------------------------------------------------
k
Ω
()
=
(EQ. 5)
R1
5120 RSET
VCOM MAX
() VCOM MIN
()
–
256 VCOM MAX
()
VCOM MIN
()
–
---------------------------------------------------------------------------------
=
(EQ. 6)
R2
5120 RSET
VCOM MAX
() VCOM MIN
()
–
255 AVDD
VCOM MIN
() 256 VCOM MAX
()
–
+
---------------------------------------------------------------------------------------------------------------------
=
(EQ. 7)
VOUT
AVDD
R2
R1 R2
+
--------------------
1
RegisterValue 1
+
256
---------------------------------------------------
R1
20RSET
--------------------
–
=
(EQ. 8)
7.5k
Ω
()
RSET MIN
()
15
16
-------
6.5V
15
20
-------
–
------------------------------
0.163k
Ω
==
>
(EQ. 9)
TABLE 1. EXAMPLE VOUT vs REGISTER VALUE
REGISTER VALUE
VOUT (V)
08.49
20
8.34
40
8.18
60
8.02
80
7.87
100
7.71
120
7.55
127
7.50
140
7.40
160
7.24
180
7.09
200
6.93
220
6.77
240
6.62
255
6.50
R1
5120 7500
8.5 6.5
–
256 8.5
6.5
–
--------------------------------------
35.4k
Ω
==
(EQ. 10)
R2
5120 7500
8.5 6.5
–
255 15
6.5 256 8.5
–
+
------------------------------------------------------------------
46.4k
Ω
==
(EQ. 11)
VCOM MIN
()
AVDD
R2
R1 R2
+
--------------------
1
R1
20RSET
--------------------
–
=
(EQ. 12)
VCOM MAX
()
AVDD
R2
R1 R2
+
--------------------
1
256
----------
R1
20RSET
--------------------
–
=
(EQ. 13)
VCOMSPAN
AVDD
R2
R1 R2
+
--------------------
1
256
----------
–
R1
20RSET
--------------------
=
(EQ. 14)
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| ISL24202IRTZ-EVALZ | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM |
| ISL24202IRTZ-T13 | 功能描述:LCD Gamma緩沖器 ISL24202IRTZFREE VCM CLBTR W/AN I2C 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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| ISL24211IRTZ | 功能描述:LCD Gamma緩沖器 ISL24211IRTZFREE VCO M DRVR + VCOM CLBTR 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 |
| ISL24211IRTZ-EVALZ | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM and Output Buffer |
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