CM2915 Datasheet, PDF (15/19 Pages) Ceramate Technical – LCD Driver (19x4) with Key Scan (4x8)

CM2915
LCD Driver (19*4) with Key Scan (4*8)
Kmn
input
DOUT
Kmn Enables
t < 108 ms
36 ms
Kmn code transmission
108 ms ( min. )
(E)
Kmn
input
DOUT
Kmn Enables
t > 108 ms
36 ms
Kmn code transmission
108 ms ( min. )
(F)
108 ms ( min. )
To avoid the mistakes made by keyboard scanning or simultaneous two-key input ，excep 3 double
key active function (K16+K26，K16+K36，K16+K46) ，the CM2915 is facilitated with 36 ms starting time。
B. The 3 double keys are depressed ( K16+K26 & K16+K36 & K16+K46 )
Kd6 : one of ( K26 or K36 or K46 )
K16
input
Kd6
input
DOUT
36 ms
K16 Enables
Kd6 Enables
t > 126 ms
36 ms
K16 code transmission
108 ms
K16+Kd6 code transmission
108 ms
The algorithm rule of the custom codes ( A0 - - - A15 ) can be selected by mask option，and the user can
choose the CM2915-1 or CM2915-2。
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
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Page 15 of 19
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Rev 1.0 Aug.1, 2003