參數(shù)資料
型號： S1C6S460D
元件分類： 微控制器/微處理器
英文描述： 4-BIT, MROM, 2 MHz, MICROCONTROLLER, UUC124
封裝： 4.69 X 4.68 MM, DIE-124
文件頁數(shù)： 27/107頁
文件大?。?/td> 788K
代理商： S1C6S460D
18
EPSON
S1C6S460 TECHNICAL MANUAL
CHAPTER 3: POWER SOURCE
3.3 Heavy Load Protection Mode
Because the load of the battery in the S1C6S460 becomes heavy due to the buzzer, lamp, and other
features, it has been equipped with heavy load protection function in case of power voltage drop. This
functions works in the heavy load protection mode.
Based on the workings of the heavy load protection function, the S1C6S460 realizes operation at 2.2 V
(Min. 1.8 V, when OSC3 oscillation circuit is not used) source voltage.
During heavy load or when 2.2 V or below is detected by SVD, set it to heavy load protection mode.
At the normal mode, the LCD system regulated voltage is created with VL2; VL1 is 1/2 reduced VL2
voltage while VL4 and VL5 are created by boosting to 1.5 and 2 times voltages, respectively. On the other
hand, at the heavy load protection mode, the regulated voltage is VL1; VL2, VL4, and VL5 are created by
boosting to 2, 3 and 4 times voltages. Because of this, the consumed current becomes greater than that in
the normal mode, be careful not to set the heavy load protection unless necessary.
The LCD system voltage modes are shown in Table 3.3.1.
Table 3.3.1 LCD system voltage mode
LCD voltage
Normal mode
Heavy load protection mode
VL1
1/2 VL2
VL1 regulated voltage
VL2
VL2 regulated voltage
2 VL1
VL4
3/2 VL2
3 VL1
VL5
4/2 VL2
4 VL1
3.3.1 Control of heavy load protection mode
The control register for the heavy load protection mode are explained below.
Table 3.3.1.1 Control register for heavy load protection mode
Address
Comment
Register
D3
D2
D1
D0
Name
Init
1
0
F71H
HLMOD
R/W
ALOFF
ALON
LDUTY
HLMOD
1
0
All LCD dots fade out control
All LCD dots displayed control
LCD drive duty switch
Heavy load protection mode
All off
All on
1/8
HLMOD
Normal
1/16
Normal
LDUTY
ALON
ALOFF
HLMOD (F71H [D0], R/W)
Controls the heavy load protection mode.
When "1" is written: Heavy load protection mode is set
When "0" is written: Heavy load protection mode is released
Reading: Valid
Conversion to heavy load protection mode is done by writing "1" to HLMOD while cancellation of this
mode is done by writing "0".
At initial reset, the mode is set to "0" (heavy load protection mode cancellation).
3.3.2 Programming notes
(1) During heavy load or when 2.2 V or below is detected by SVD, set it to heavy load protection mode.
Unless it is necessary, be careful not to set the heavy load protection mode with the software.
(2) Perform heavy load driving only after setting up at least 1 ms wait time through the software, after
switching to the heavy load protection mode. (See Figure 3.3.2.1.)
(3) When the heavy load protection mode is to canceled after completion of heavy load driving, set up at
least 2 seconds wait time through the software. (See Figure 3.3.2.1.)
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