- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄2080 > ISL24211IRTZ (Intersil)IC VCOM CALIBRATOR I2C 10TDFN PDF資料下載
參數(shù)資料
| 型號： | ISL24211IRTZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VCOM CALIBRATOR I2C 10TDFN |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 校準(zhǔn)器 |
| 應(yīng)用： | LCD 驅(qū)動器，基準(zhǔn)電壓發(fā)生器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-TDFN（3x3） |
| 包裝： | 管件 |
ISL24211
7
FN7585.0
February 23, 2011
The maximum value of IDVR_OUT can be calculated by
substituting the maximum register value of 255 into Equation 2,
resulting in Equation 3:
Equation 2 can also be used to calculate the unit sink current
step size per Register Code, resulting in Equation 4:
Determination of RSET
The ultimate goal for the ISL24211 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 ISL24211 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 DVR_OUT can be calculated from Equation 8:
With amplifier A2 in the unity-gain configuration (VCOM_OUT tied
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, IDVR(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):
IDVROUT MAX
()
AVDD
20RSET
--------------------
=
(EQ. 3)
ISTEP
AVDD
256
() 20
() RSET
()
----------------------------------------------
=
(EQ. 4)
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)
VDVROUT
AVDD
R2
R1 R2
+
--------------------
1
RegisterValue 1
+
256
---------------------------------------------------
R1
20RSET
--------------------
–
=
(EQ. 8)
TABLE 1. EXAMPLE VDVR_OUT vs REGISTER VALUE
REGISTER VALUE
VDVR_OUT (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
7.5k
Ω
()
RSET MIN
()
15
16
-------
6.5V
15
20
-------
–
------------------------------
0.163k
Ω
==
>
(EQ. 9)
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)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL24212IRTZ | IC PROG 8BIT VCOM CALIBRTR 10TDF |
| ISL28197FRUZ-T7 | IC COMP RRIO SGL 800NA 6-TDFN |
| ISL3035EIRTZ-T | IC LEVEL TRANSLATOR 6CH 16-TQFN |
| ISL4089IBZ-T7A | IC VIDEO AMP DC-RESTORED 8SOIC |
| ISL45041IRZ-T | IC VCOM CALIBRATOR TFT/LCD 8TDFN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL24211IRTZ-EVALZ | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM and Output Buffer |
| ISL24211IRTZ-T13 | 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 |
| ISL24212 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM and Output Buffer |
| ISL24212IRTZ | 功能描述:LCD Gamma緩沖器 ISL24212IRTZ VCOM DR VR + CLBTR UP/DN 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 |
| ISL24212IRTZ-EVALZ | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable VCOM Calibrator with EEPROM and Output Buffer |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。