上海贝岭股份有限公司
Shanghai Belling Co., Ltd.
BL22P14 USER MANUAL
BM22P14用户手册
LCD frequency
Static
512
256
128
64
1/2Duty
256
128
64
1/3Duty
171
85
1/4Duty
128
64
Fs/25 =512 Hz
Fs/26 =256 Hz
Fs/27 =128 Hz
Fs/28 =64 Hz
43
32
32
21
16
If RTC oscillator is the clock source, dividing frequency should be1/26
~
1/29.
THE FRAME FREQUENCY WHEN RTC IS CLCOK SOURCE(Hz)
LCD frequency
Fs/26 =512 Hz
Fs/27=256 Hz
Fs/28 =128 Hz
Fs/29 =64 Hz
Static
512
256
128
64
1/2Duty
256
128
64
1/3Duty
171
85
1/4Duty
128
64
43
32
32
21
16
Other dividing frequency (1/210~1/215) is used when OSC or RC is clock source.
LCD drive voltage
VLCD is the voltage source of LCD and divided to four voltage level by internal resistors.
VLCD may connect to VDD or other voltage. Two capacitors connecting to V1 and V2 will
improve stability for display.
COM/SEG output
The output number can be 4 COM and 18 SEG (48pin), 4 COM and 8 SEG (28pin and
24pin).COM3 and SEG18 are at common pin. COM3 is effective only at 1/4duty mode and
other mode is SEG18.
pin
duty
Drive number
bias
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