SM8220 Datasheet, PDF (7/8 Pages) Nippon Precision Circuits Inc – Calling Number Identification Receiver IC

TIMING DIAGRAM
INPUT
(TIP, RING)
1st Ring
RDRC*
RDET*
SM8220/SM8221
101010... 1
Data
VIH2
VIL2
2nd Ring
PDWN
CDET
DOUT
tSUPD
tDAQ
101010... 1
Data
tDCH
OSCOUT*
tDOSC
TYPICAL APPLICATION CIRCUIT
*: Not available for SM8221.
Protection
Network
From TIP
From RING
0.2µF
0.001µF 91kΩ (240kΩ)
0.001µF 91kΩ (240kΩ)
0.2µF
0.1µF
470kΩ
270kΩ
33kΩ
0.2µF
SM8220
TIP
VDD
RING
FOUT
AGND
DMIN
+5V
10µF
0.1µF
RDIN
DOUT
RDRC
NC
RDET
CDET
PDWN
GND
OSCOUT
OSCIN
/CLKIN
3.579545
MHz
( ) = When 3V range
Controller
LCD Driver
LCD Display
From TIP
From RING
0.001µF 91kΩ (240kΩ)
Protection
Network ^{0.001µF 91kΩ (240kΩ)}
SM8221
TIP
VDD
RING
DOUT
PDWN
CDET
GND
CLKIN
+5V
10µF
3.579545MHz
( ) = When 3V range
Controller
LCD Driver
LCD Display
(Note)
When the Ring Detect feature of SM8220 is not used, always connect RDIN and RDRC pins to the system ground level.
This will cut excess current drain from VDD under the normal and power down mode of operation.
This diagram example is desingned to adapt to the specifications of United States.
When it is used in other area, the constants may have to chenged appropriately.
NIPPON PRECISION CIRCUITS-7