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LC75886PWH-H

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LC75886PW
www.onsemi.com
19
4. Normal/sleep mode, when key scan operations are disabled
(1) The KS1 to KS6 pins are set to high or low level by the S0 and S1 bits in the control data.
(2) No key scan operation is performed, whichever key is pressed.
(3) If the key scan disabled state (KSC=1 in the control data) is set during a key scan, the key scan is stopped.
(4) If the key scan disabled state (KSC=1 in the control data) is set when a key data read request (a low level on DO) is
output to the controller, all the key data is set to 0 and the key data read request is cleared (DO is set high).
Note that DO, being an open-drain output, requires a pull-up resister (between 1 to 10 k).
(5) The key scan disabled state is cleared by setting KSC in the control data to 0.
Multiple Key Presses
Although the LC75886PW is capable of key scanning without inserting diodes for dual key presses, triple key presses
on the KI1 to KI5 input pin lines, or multiple key presses on the KS1 to KS6 output pin lines, multiple presses other
than these cases may result in keys that were not pressed recognized as having been pressed. Therefore, a diode must be
inserted in series with each key. Applications that do not recognize multiple key presses of three or more keys should
check the key data for three or more 1 bits and ignore such data.
DO
DI
CE
Key scan
Key input
(KS6 line)
615T[s] 615T[s]
(KSC=0) (KSC=0) (KSC=0)
Key data read request
Key data read
Serial data transfer Serial data transfer
Key
address(43H)
Key data read
Key data read request
Serial data transfer
Key
address(43H)
DO
DI
CE
Key scan
Key input 2
615T[s] 615T[s]
(KSC=0) (KSC=0) (KSC=1)
Key input 1
(KSC=0) (KSC=1)
Key data read request
Key data read
Key
address(43H)
Serial data transfer Serial data transfer Serial data transfer Serial data transfer Serial data transfer
Key data read request
T= =
1
f
OSC
1
f
CK
T= =
1
f
OSC
1
f
CK
LC75886PW
www.onsemi.com
20
1/4 Duty, 1/3 Bias Drive Technique
Control data
Common and segment output waveform
frame frequency f
O
[Hz]
FC0 FC1 FC2
1 1 0 f
OSC
/768, f
CK
/768
1 1 1 f
OSC
/576, f
CK
/576
0 0 0 f
OSC
/384, f
CK
/384
0 0 1 f
OSC
/288, f
CK
/288
0 1 0 f
OSC
/192, f
CK
/192
COM3
COM2
COM1
COM4
LCD driver output when all
LCD segments corresponding to
COM1, COM2, COM3, and COM4 are on.
LCD driver output when
LCD segments corresponding to
COM2 and COM4 are on.
LCD driver output when only
LCD segments corresponding to
COM4 are on.
LCD driver output when
LCD segments corresponding to
COM1, COM2, and COM3 are on.
LCD driver output when
LCD segments corresponding to
COM2 and COM3 are on.
LCD driver output when
LCD segments corresponding to
COM1 and COM3 are on.
LCD driver output when only
LCD segments corresponding to
COM3 are on.
LCD driver output when
LCD segments corresponding to
COM1 and COM2 are on.
LCD driver output when only
LCD segments corresponding to
COM2 are on.
LCD driver output when only
LCD segments corresponding to
COM1 are on.
LCD driver output when all LCD
segments corresponding to COM1,
COM2, COM3, and COM4 are turned off.
V
DD
1
V
DD
2
f
O
[Hz]
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
V
DD
1
V
DD
2
V
DD
0V
LC75886PW
www.onsemi.com
21
1/3 Duty, 1/3 Bias Drive Technique
Control data
Common and segment output waveform
frame frequency f
O
[Hz]
FC0 FC1 FC2
1 1 0 f
OSC
/768, f
CK
/768
1 1 1 f
OSC
/576, f
CK
/576
0 0 0 f
OSC
/384, f
CK
/384
0 0 1 f
OSC
/288, f
CK
/288
0 1 0 f
OSC
/192, f
CK
/192
COM3
COM2
COM1
LCD driver output when all
LCD segments corresponding to
COM1, COM2, and COM3 are on.
LCD driver output when
LCD segments corresponding to
COM2 and COM3 are on.
LCD driver output when
LCD segments corresponding to
COM1 and COM3 are on.
LCD driver output when only
LCD segments corresponding to
COM1 are on.
LCD driver output when only
LCD segments corresponding to
COM2 are on.
LCD driver output when only
LCD segments corresponding to
COM3 are on.
LCD driver output when
LCD segments corresponding to
COM1 and COM2 are on.
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
V
DD
0V
V
DD
2
V
DD
1
0V
f
O
[Hz]
LCD driver output when all LCD
segments corresponding to COM1,
COM2, and COM3 are turned off.
V
DD
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36

LC75886PWH-H

Mfr. #:
Buy LC75886PWH-H
Manufacturer:
ON Semiconductor
Description:
LCD Drivers LCD DISPLAY DRIVER
Lifecycle:
New from this manufacturer.
Delivery:
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