CM2915 Datasheet, PDF (10/19 Pages) Ceramate Technical – LCD Driver (19x4) with Key Scan (4x8)

CM2915
LCD Driver (19*4) with Key Scan (4*8)
6 To set the custom codes ( A0 - - - A15 )
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。
A. The CM2915-1 custom code
The value of ROM1 (8 bits) & ROM2 (8 bits) are both “ 00H “，and it is decided by one
mask layer 。The A0 - - A7 are set by logical OR between the switches (S0 - - S7) and
ROM1。The A8 - - A15 equal some bits be inverted of A0 - - A7，the inversion are decided by logical
OR between the switches (S8 - - S15) and ROM2。
For example :
CM2915-1
AIN
C1
C2
C3
C4
C5
C6
C7
C8
200K
200K
200K
200K
200K
200K
200K
200K
S8
S0
1N4148
S9
S1
1N4148
S10
S2
1N4148
S11
S3
1N4148
S12
S4
1N4148
S13
S5
1N4148
S14
S6
1N4148
S15
S7
1N4148
1 : Switch close
0 : Switch open
RLCD-4
S0 - - S7
External switch S0 - - - S15 : → 0 1 0 1 0 1 0 0
S8 - - S15
11000100
ROM1
On chip ROM1，ROM2 : → 0 0 0 0 0 0 0 0
ROM2
00000000
(S0 - - S7) OR ROM1
A0 - - A7 : → 0 1 0 1 0 1 0 0
A8’ - - A15’ : →
1 : non-inversion
0 : inversion
(S8 - - S15) OR ROM2
11000100
xx↓↓↓x↓↓
A0 A1 - - - A5 - -
- - A2B A3B A4B - A6B A7B
A8 - - A15 : →
A0 - - A7
Custom codes A0 - - - A15 : → 0 1 0 1 0 1 0 0
01101111
A8 - - A15
01101111
* 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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Rev 1.0 Aug.1, 2003