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654321
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Title
Number RevisionSize
B
Date: 21-Mar-2002 Sheet of
File: N:\YHWork\M300B\keyboard\04257a\04259A.ddbDrawn By:
S5
S1
S2
S3
S4
S6
S7
S8
C1
.1uF
VCC
SDA
SCL
+5_DISP
DISP_RET
KYBRD_INT
VCC
SDA
SCL
+5_DISP
DISP_RET
KYBRD_INT
VCC
S9
RI-1000 ONLY
1
2
3 8
5
7
4
6
10
9
J1
JP3
1
2
3 8
5
7
4
6
10
9
J2
JP4
Y1
1
Y2
2
Y3
3
AVL
13
Y4
4
Y5
5
OSC
6
KBM
7
X4
8
X3
9
X1
12
X2
11
Vss
10
OE
14
D_E
15
D_D
16
D_C
17
D_B
18
D_A
19
Vcc
20
U1
74C923
+
C6
10uF
PRE
4
CLK
3
D
2
CLR
1
Q
5
Q
6
U3A
MM74HC74A
C7
300pF
R2
1.0K
VCC
VCC
A1
SONALERT
RED
YEL
GRN
+
DS1
DS3
DS2
RI-1000 ONLY
DS4
DS6
DS5
INT
1
A1
2
A2
3
SCL
22
SDA
23
P10
13
P00
4
P01
5
P02
6
P03
7
P04
8
P05
9
P06
10
P07
11
Vss
12
A0
21
P11
14
P12
15
P13
16
P14
17
P15
18
P16
19
P17
20
Vdd
24
U2
PCF8575
MAINT SW
PRE
10
CLK
11
D
12
CLR
13
Q
9
Q
8
U3B
MM74HC74A
MAINT SW RET
MAINT LED V+
MAINT LED
LANG SW
LANG SW RET
SPR I/O_0
SPR I/O RET
MAINT_LED
MAINT_LED
LANG_SELCT
SPR_I/O_0
LANG_SELCT
SPR_I/O_0
MAINT_SW
MAINT_SW
VCC
12
3
4
5
6
RN1
4.7K
KYBRD_INT
12
34
56
78
910
1112
1314
1516
J3
+5_DISP
DISP_RET
AO
1
A1
2
A2
3
SCL
14
SDA
15
INT
13
P0
4
P1
5
P2
6
P3
7
P4
9
P5
10
P6
11
P7
12
Vdd
16
Vss
8
U4
PCF8574
DISP_WR
DISP_WR
RST
3
Vss
2
Vdd
1
U6
MCP120T
Q2
MMBT3904
D
1
2
G
3
S
4
5
6
Q1
SI3443DV
AO
1
A1
2
A2
3
SCL
14
SDA
15
INT
13
P0
4
P1
5
P2
6
P3
7
P4
9
P5
10
P6
11
P7
12
Vdd
16
Vss
8
U5
PCF8574
12
3
4
5
6
RN2
4.7K
DISP_PWR
VCC
DISP_BUSY
DISP_BUSY
DISP_PWR_EN
TO/FRM DISPLAY
OPT. MAINT SWITCH
TP2
VCC
TP3
+5_DISP
TP6
DISP_PWR
TP7
DISP_RET
TP1
GND
TP8
BUSY
DISP_RET
+5_DISPVCC
DISP_BUSY
DISP_PWR
C2
.1uF
+
C13
10uF
C3
.1uF
C8
220pF
C9
220pF
+5_DISP
C4
.1uF
+
C14
100uF
DISP_RET
C10
220pF
(U1)
C11
220pF
C12
220pF
DISP_RET
C5
.1uF
(U2)
1
2
JP5
DISP_PWR_OVR
DISP_PWR_EN must
be high for display to
be powered.
KBD_A0
KBD_A1
KBD_A2
DISP_DA_A0
DISP_DA_A1
DISP_DA_A2
DISP_CN_A0
DISP_CN_A1
DISP_CN_A2
SCL
SDA
SCL
SDA
SCL
SDA
SPR_I/O_1
SPR_I/O_2
SPR_I/O_1
SPR_I/O_2
SPR I/O_1
SPR I/O RET
SPR I/O_2
SPR I/O RET
DISPLAY CONTROL
DISPLAY DATA
KEYBOARD, LED & HORN
GRN LED
YEL LED
RED LED
LED 4
LED 5
LED 6
HORN
12
34
56
78
910
1112
1314
1516
1718
JP1
ADRS SLCTS
12
3
4
5
6
7
9
8
10
RN5
4.7K
R3
4.7K
R4
4.7K
KBD_A0
KBD_A1
KBD_A2
DISP_CN_A2
DISP_CN_A1 DISP_DA_A2
DISP_DA_A0
DISP_DA_A1DISP_CN_A0
1 2
3 4
JP2 I2C TERMINATION
SCL
SDA
Schematic for PCA #04258 and PCB #04257, Keyboard/Display Interface for E series
04259
a
C15
.1uF
(U4)
DEFAULT ADDRESS SELECTS FOR I2C TO PARALLEL
DECODERS:
KEYBOARD (KBD_A0 - A2)
1 1 1
DISPL CONTROL (DISP_CN_A0 -A1)
0 1 1
VCC
C16
.1uF
(U45
4.85V DTCT
TP4
SDA
TP9
SCL
SCL
SDA
TP5
KYBRD INT
KYBRD_INT
OPT. LANG. SWITCH
S13
1
2
3
4
5
10
9
7
8
6
RN3
220
MAINT_LED_V+
MAINT_LED_V+
1
2
3
4
5
6
7
8
9
10
11
12
13
14
J4
3M-2514-6002UB
S12
T8201
VCC
Layout Instructions:
1. Minimum trace width 8 mil would like to have
10 mil traces if possible.
2. Please run traces on both and backside but
where possible fill one side with GND.
3. Minimum width for +5_DISP, DISP_PWR,
DISP_RET is 40 mil, except to test points.
4. Minimum width for VCC, GND, Vdd, Vss is
30 mil, except to test points
NOTES:
1. This schematic is based on
the PWB PN, 03974 and
applies to PCA PN, 03975
C17
1500uF
R20
1K
+5_DISP
VCC
VCC
VCC
VCC
M1 M2
M3 M4
M5
M9
M6
M8
M7
M10
MF3
MF4