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參數(shù)資料
| 型號(hào)： | ISL24201IRTZ |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC VCOM CALIBRATOR I2C 8TDFN |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 校準(zhǔn)器 |
| 應(yīng)用： | LCD 顯示器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WSDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-TDFN（3x3） |
| 包裝： | 管件 |
ISL24201
7
FN7586.1
December 9, 2010
The maximum voltage on the SET pin is AVDD/20 and is added to
the minimum voltage difference between the VOUT and SET pins to
Output Voltage
The output voltage, VOUT, of the OUT pin can be calculated from
Equation 6:
While Equation 6 can be used to calculate the output voltage, it
does not help select the values of R1, R2 and RSET to obtain a
specific range of VCOM voltages.
Output Voltage Span Calculation
The span of the output voltage is typically centered around the
nominal VCOM voltage value, which is typically near half of the
AVDD voltage. The high VCOM voltage occurs with the register
value of zero, while the low VCOM voltage occurs with the register
value of 255. Figure 7 shows the definition of several terms used
later in the text.
There are three variables that control the VCOM calibrator’s
operating point; the span of the VCOM voltage, the maximum
current sink and the source impedance of the resistive divider.
Figure 8 shows a range of operating points for these three variables
and a quick way to estimate a specific operating point. The X-axis is
the span of the VCOM voltage (High VCOM Voltage - Low VCOM
Voltage), and the Y-axis is the maximum sink current set by RSET.
The individual plots of each RTH show the VCOM span plotted against
the maximum OUT sink current given that value of source
impedance of the voltage divider. RTH is the Thevenin equivalent
resistance of the voltage divider R1 and R2, which is the resistance
To make a final selection of the resistor values for R1 and R2, The
supply voltage AVDD and the value of RSET are specified. The
The R1 and R2 calculations are based on the span of the VCOM
voltage being centered at half the AVDD voltage.
As an example, AVDD = 15V, the maximum value for ISET is
selected to be 100A and the required span is 2V. Using Figure 8
as a guide, the VCOM maximum is equal to 8.5V and the VCOM
minimum is equal to 6.5V. Rearranging equation and calculation
the value of RSET:
VOUT MIN
()
AVDD
20
--------------
MinimumSaturationVoltage
+
≥
(EQ. 5)
VOUT
AVDD
R2
R1 R2
+
--------------------
1
RegisterValue 1
+
256
---------------------------------------------------
R1
20RSET
--------------------
–
=
(EQ. 6)
GND
AVDD
NOM INAL VCOM VOLTAGE
HIGH VCOM VOLTAGE
LOW VCOM VOLTAGE
SPAN
FIGURE 7. VOLTAGE LEVELS FOR VCOM
RTH
R1R2
R1 R2
+
--------------------
=
(EQ. 7)
VCOMSPAN
ISET RTH
()
=
(EQ. 8)
FIGURE 8. GRAPH of VCOM SPAN vs MAXIMUM OUTCURRENT
AND RTH
0.6
0.5
0.4
0.3
0.2
0.1
0
01234
56
VCOM SPAN (V)
OU
T
PIN
MA
XIM
U
M
CU
R
E
NT
(m
A
)
R T
H
=
10
kΩ
RTH
= 2
5kΩ
RTH =
50kΩ
RTH = 10
0kΩ
R1
40RSET SPAN
()
AVDD SPAN
+
------------------------------------------
=
(EQ. 9)
R2
40RSET SPAN
()
AVDD SPAN
–
------------------------------------------
=
(EQ. 10)
RSET
AVDD
20IOUT MAX
()
-------------------------------------
15
20 0.000100
()
--------------------------------------
7500
Ω
==
=
(EQ. 11)
R1
40 7500
() 2
()
15 2
+
-----------------------------------
39.29k
Ω
==
(EQ. 12)
R2
40 7500
() 2
()
15 2
–
-----------------------------------
46.15k
Ω
==
(EQ. 13)
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| ISL24201IRTZ-T13 | 功能描述:LCD Gamma緩沖器 ISL24201IRTZ VCOM 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 |
| ISL24202 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM |
| ISL24202IRTZ | 功能描述:LCD Gamma緩沖器 ISL24202IRTZFREE VCO M 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 |
| ISL24202IRTZ-EVALZ | 制造商:INTERSIL 制造商全稱: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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