sm5221-001 SamHop Microelectronics Corp., sm5221-001 Datasheet - Page 3

• Manufacturer Part Number: sm5221-001
• Description: Keys Encoder
• Manufacturer: SamHop Microelectronics Corp.

BLOCK DIAGRAM
FUNCTION DESCRIPTION
(1) Oscillation
KI
KI
KI
KI
0
1
2
3
The SM5221-001/002 oscillation circuit is designed for use of a 400 kHz or 500 kHz ceramic
resonator, but there may be mutual influence between variations in the IC and ceramic
resonator resulting in abnormal oscillation. The oscillation circuit starts to operate when a key
is depressed.
KEY INPUT SCAN
三合微科股份有限公司
S
AM
CIRCUIT
SEL
H
OP
Microelectronics Corp.
OSCI
OSCI
C
KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7
1
TIMING GENERATION & CONTROL
CODE GENERATION CIRCUIT
OSC CIRCUIT
OSCO
KEY INPUT/OUTPUT SCAN CIRCUIT
Page 3
CIRCUIT
V
DD
OSCO
C
2
SM5221-001/002
Vss
32 KEYS ENCODER
CONTROL
OUTPUT
CIRCUIT
V.2.0 Mar 8,2002
DOUT
LED
CODE