C1
TIP
0.2 µF
RING
C2
0.2 µF
TO PHONE
500 pF C3
500 pF C4
470 kΩ
18 kΩ
15 kΩ
APPLICATION CIRCUIT
10 kΩ
0.1 µF VDD
2 kΩ
2 kΩ
10 kΩ
TI 1 16 15 DOC
RI 2
14 DOR
RDI1 3
13 CDO
RDI2 4
12 RDO
NC 5
RT 6
11 CLKSIN
VDD
10 OSCin
PWRUP 7
8
9 OSCout
VDD
270 kΩ
INTERRUPT
0.2 µF
MCU
3.68 MHz
RI
RT
RDO
PWRUP
CDO
DOC
DISPLAY
Figure 8. Adjunct Box Concept for Calling Number Display
FIRST RING
0.5
2 SECONDS
SEC
0.5
SECOND RING
SEC
2 SECONDS
0101 1
DATA
INTERRUPT
FOR MCU
NOTE 1
NOTE 1
DATA
NOTE 2
DOR
DATA
OSC
3.58 MHz, 3.6864 MHz, OR 455 kHz
NOTES:
1. MCU must assert PWRUP to MC14LC5447.
2. No data detected, MCU powers down the MC14LC5447.
Timing Diagram for Figure 8
MOTOROLA
MC14LC5447
9