HT16L21
Characteristics Curves – f
LCD
vs. V
DD
vs. Temperature
LCD Frame Frequency f
LCD
is Set to 64Hz
80
70
60
50
40
30
20
10
0
1.2 1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
V
DD
(V)
-40℃
-20℃
0℃
25℃
65℃
85℃
LCD Frame Frequency f
LCD
is Set to 85.3Hz
100
90
LCD frame frequency (Hz)
LCD frame frequency (Hz)
80
70
60
50
40
30
20
10
0
1.2 1.5 1.8 2.1 2.4 2.7 3
3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
V
DD
(V)
-40℃
-20℃
0℃
25℃
65℃
85℃
LCD Frame Frequency f
LCD
is Set to 128Hz
160
140
LCD Frame Frequency f
LCD
is Set to 170.6Hz
200
180
LCD frame frequency (Hz)
-40℃
-20℃
0℃
25℃
65℃
85℃
LCD frame frequency (Hz)
120
100
80
60
40
20
0
1.2 1.5 1.8 2.1 2.4 2.7 3
3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
V
DD
(V)
160
140
120
100
80
60
40
20
0
1.2 1.5 1.8 2.1 2.4 2.7 3
3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
V
DD
(V)
-40℃
-20℃
0℃
25℃
65℃
85℃
Functional Description
Power-On Reset
When the power is applied, the device is initialized
by an internal power-on reset circuit. The status of the
internal circuits after initialization is as follows:
• All common outputs are set to V
LCD.
• All segment outputs are set to V
LCD
.
• The 1/3 bias drive mode is selected.
• The system oscillator and the LCD bias generator
are off state.
• LCD display is off state.
•
Integrated regulator is disabled.
•
Internal voltage adjustment function is enabled.
• The segment/LED shared pins are set as the
segment pins.
• Frame frequency is set to 64Hz.
• Blinking function is switched off.
Reset Function
When the RSTB pin is pulled to a low level, a
reset operation is executed and it will initialize all
functions. The status of the internal circuits after
initialization is as follows:
• All common outputs are set to V
LCD.
• All segment outputs are set to V
LCD
.
• The 1/3 bias drive mode is selected.
• The system oscillator and the LCD bias generator
are off state.
• LCD display is off state.
•
Integrated regulator is disabled.
• The segment/LED shared pin is set as the segment
pin.
• Frame frequency is set to 64Hz.
• Blinking function is switched off.
Rev. 1.10
9
December 27, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
