參數(shù)資料
型號(hào)： NT7502H-TABF1
廠商： Electronic Theatre Controls, Inc.
英文描述： 65 X 132 RAM-Map LCD Controller / Driver
中文描述： 65 × 132 RAM的地圖LCD控制器/驅(qū)動(dòng)器
文件頁數(shù)： 20/54頁
文件大小： 687K
代理商： NT7502H-TABF1
NT7502
The V0 voltage is a function of the V0 voltage regulator internal resistor ratio register and the electronic volumn register.
Setup example: When selecting T
a
= 25
℃
and V0 = 7V for an NT7502 model on which the temperature gradient = -0.05%
℃
,
using the equation A-1, the following setup is enabled.
Table. 13
Register
Contents
D5 D4 D3 D2 D1 D0
-
-
-
1
0
0
For V0 voltage regulator
Electronic Volume
0
1
1
0
0
1
#
When the V0 voltage regulator internal resistors or the electronic volume function is used, it is necessary to at least set the
voltage regulator circuit and the voltage follower circuit to an operating mode using the power control set commands.
Moreover, it is necessary to provide a voltage from VOUT when the Booster circuit is OFF.
#
The VR terminal is enabled only when the V0 voltage regulator internal resistors are not used (i.e. the IRS terminal = “L”).
When the V0 voltage regulator internal resistors are used (i.e. when the IRS ternimal = “H”), then the VR terminal is left open.
#
Because the input impedance of the VR terminal is high, it is necessary to take into consideration short leads, shield cables,
etc. to handle noise.
The Liquid Crystal Voltage Generator Circuit
The V0 voltage is produced by a resistive voltage divider within the IC, and can be produced at the V1, V2, V3, and V4 voltage
levels required for liquid crystal driving. Moreover, when the voltage follower changes the impedance, it provides V1, V2,V3,
and V4 to the liquid crystal drive circuit. 1/9 bias or 1/7 bias for NT7502 can be selected.
High Power Mode
The power supply circuit equipped in the NT7502 chips has very low power consumption (normal mode:
HPM
= “H”). However
for LCDs or panels with large loads, this low-power power supply may cause display quality to degrade. When this occurs,
setting the
HPM
terminal to “L” (high power mode) can improve the quality of the display. We recommend that the display be
checked on actual equipment to determine whether or not to use this mode.
Moreover, if the improvement to the display is inadequate even after high power mode has been set, then it is necessary to add
a Command Sequence when Built-in Power Supply is turned OFF.
Follow the command sequence as shown below to turn off the built-in power supply after the system enters standby mode.
20
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