CM2915 Datasheet, PDF (13/19 Pages) Ceramate Technical – LCD Driver (19x4) with Key Scan (4x8)

CM2915
LCD Driver (19*4) with Key Scan (4*8)
The vaules of the data codes ( D0 - - D7 )
The CM2915 contains 32 function keys。Each key corresponds to one data code。 The CM2915
provide 3 double keys。
C. The CM2915 data codes :
KEY
DATA CODES
NAME D0 - - - - - - - - - - D6 D7
K11
0 0 0 0 0 0 0 0/1
K21
1 0 0 0 0 0 0 0/1
K31
0 1 0 0 0 0 0 0/1
K41
1 1 0 0 0 0 0 0/1
K12
0 0 1 0 0 0 0 0/1
K22
1 0 1 0 0 0 0 0/1
K32
0 1 1 0 0 0 0 0/1
K42
1 1 1 0 0 0 0 0/1
K13
0 0 0 1 0 0 0 0/1
K23
1 0 0 1 0 0 0 0/1
K33
0 1 0 1 0 0 0 0/1
K43
1 1 0 1 0 0 0 0/1
K14
0 0 1 1 0 0 0 0/1
K24
1 0 1 1 0 0 0 0/1
K34
0 1 1 1 0 0 0 0/1
K44
1 1 1 1 0 0 0 0/1
K16+K26 1 0 1 0 1 1 0 0/1
K16+K36 0 1 1 0 1 1 0 0/1
KEY
DATA CODES
NAME D0 - - - - - - - - - - D6 D7
K15
0 0 0 0 1 0 0 0/1
K25
1 0 0 0 1 0 0 0/1
K35
0 1 0 0 1 0 0 0/1
K45
1 1 0 0 1 0 0 0/1
K16
0 0 1 0 1 0 0 0/1
K26
1 0 1 0 1 0 0 0/1
K36
0 1 1 0 1 0 0 0/1
K46
1 1 1 0 1 0 0 0/1
K17
0 0 0 1 1 0 0 0/1
K27
1 0 0 1 1 0 0 0/1
K37
0 1 0 1 1 0 0 0/1
K47
1 1 0 1 1 0 0 0/1
K18
0 0 1 1 1 0 0 0/1
K28
1 0 1 1 1 0 0 0/1
K38
0 1 1 1 1 0 0 0/1
K48
1 1 1 1 1 0 0 0/1
K16+K46 1 1 1 0 1 1 0 0/1
The 8-bit data codes of will define the inverse codes of the other 8-bit data codes ( D8 - - D15 )。 D7 is
defined by an external switch.
- Code D7=0 -> connect to vdd.
- Code D7=1 -> connect to vss.
7 Function Keys control
If two or more keys are depressed simultaneously ( except K16+K26 & K16+K36 & K16+K46 )
，the transmission is disabled by the multi-depression prevention circuit。As regards the key transmission
priority in the case of two depressions，with simultaneous depressions ( ± 36 ms ) transmission is
disabled and first depressions，later remainder priority is used。
When a key is pressed，reading of the custom code and key data code is started，and IRO
output begins 36 ms later，so that if the key is begin depressed during this 36 ms interval one
transmission is performed。If a key is held down for 108 ms or longer，consecutive transmissions
of the leader code only are performed while the key is depressed。As a key interruption operation
can handle an interval of up to 126 ms ( from ON to ON ) 。It is possible to configure a system
with an extremely fast response time。
* All specs and applications shown above subject to change without prior notice.
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Rev 1.0 Aug.1, 2003