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In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices shown in catalogs, data books,
etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
SM3503
DESCRIPTION
The SM3503 is a CMOS 4-bit single-chip microcomputer for databank incorporating data memory
RAM, LCD driver, key input circuit and buzzer output circuit. By connecting an external crystal, a 1 Hz
timer interrupt is made possible for easier clock
function.
FEATURES
• ROM capacity :
Program ROM 6 k x 23 bits
Character ROM 5 x 8 x 128 bits
• RAM capacity :
Working RAM 256 x 4 bits
Display RAM 60 x 8 bits
Data RAM 1 k x 8 bits
• LCD display : 60 - segment x 8 -common
• I/O ports :
Buzzer output 1 bit (4 kHz)
Key input 7 bits
• Standby release : 2 events (2 Hz signal, key input)
• Built-in oscillator :
• Instruction cycle time : 12 µs
• Operating temperature : –10 to +60°C
• Supply voltage : 2.5 to 3.4 V
• Package : 100-pin QFP (QFP100-P-1420)
SM3503
4-Bit Single-Chip Microcomputer
(For Data Bank Use)
System clock (built-in CR oscillator) 250 kHz
Timer (built-in CR oscillator) 32.8 kHz
(external crystal)
32.768 kHz
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SM3503
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SYSTEM COMFIGURATION EXAMPLE
APPLICATION EXAMPLE
Common signal
Segment signal
Key matrix
S1-S6
S53-S60
(MAX. 84-key)
S1-S60
KI2-KI7
XCR
ON
Key
RESET
Key
KI1 VCC TEST RESET XI XO BZ
H
1-H8
VCC
3V
Buzzer
VCC
SM3503
+
–
LCD Control : 60 x 8 - dot
KEY : MAX. 85 - key
SM3503
5 x 5 - dot matrix : 1
8 - segment : 1
AB7CD8EF
9
GH4IJ5KL
6
123456
QWE R T Y
A
7
B8C9D÷E>F
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SM3503
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(2.4)
0.65
0.3
± 0.2
0.1
± 0.2
± 0.1
(2.4)(2.4)
(2.4)
20.0
24.8
0.15
(22.98)
51
31
130
100
81
50
80
(16.98)
± 0.2
± 0.4
14.0
18.8
± 0.4
± 0.2
± 0.05
± 0.1
2.75
1.3
TYP.
0.15
0.15 M
Package
base plane
100 QFP (QFP100-P-1420)
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