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EM92547B Schematic ( PDF Datasheet ) - ELAN Microelectronics Corp

Teilenummer EM92547B
Beschreibung CALLER ID FSK DECODER
Hersteller ELAN Microelectronics Corp
Logo ELAN Microelectronics Corp Logo 




Gesamt 13 Seiten
EM92547B Datasheet, Funktion
ELAN MICROELECTRONICS CORPORATION
EM92547A/B/D
CALLER ID FSK DECODER
ELAN MICROELECTRONICS CORP.
Office :
6-F1.,42, Sec.2, Chung Shaan N.
Road.,
Taipei, Taiwan, R.O.C.
TEL : (02) 5628813 EXT.686,687;5223065
FAX : (02) 5516348
TELEX : 21540 HTC, 22486 EHSIN
7F-1, No. 9 Prosperity 1st Rd.
Science-Based Industrial Park. Hsin Chu
City.
Taiwan, R.O.C.
TEL : (03) 5787505
FAX : (03) 5779095
Publication Release Date :
Agent :






EM92547B Datasheet, Funktion
EM92547A/B/D
CALLER ID FSK DECODER
With pin4 enabled, a portion of the power ring above 1.2V is fed to the ring counter
circuit. This circuit is a digital integrator. When the input signal at pin4 is above 1.2V,the
integrator is counting up at 800 Hz rate. Otherwise, counting down at 800Hz rate. A ring is
qualified when an internal count of binary 48 is reached and disqualified when an internal
count below binary 48.
Once the ring signal is qualified, the /RING INDICATOR will sent low. This can be
fed back to /PWR UP or can be used as an interrupt to an MCU. Once the /PWR UP pin is
below Vt-, the part will fully powered up, and ready to receive FSK. During this mode the
device current will increase to 3 mA typical.
* power up circuit
/PWR UP
RING /RD
DETECT
WAKE UP CLOCK
GEN
XTRL
The power up circuit accepts /PWR UP signal and /RD signal. In the power down
mode, if a ring signal is sent, the ring detector wakes up the oscillator and the main bias
generator. This in turn activates the IC. Once activated, a valid signal RD (ring detector) is
sent. Since no valid FSK single being detected, the whole IC will back to its power-down
mode after a period (default 3-second).
FSK data output(DATA OUT pin), FSK short data output(SHORTDATA) ,and FSK
carrier detect (/CD) :
As shown from functional block diagram, DATA OUT pin won’t have any FSK
decoding data until ‘Data Valid Energy Detect Circuit’ has detected enough energy and
timing (about 15ms) FSK signal coming. When this timing has been checked correctly,
open-drain carrier detect /CD pin will be pull low then DATA OUT pin will have decoding
data output. At this time, SHORTDATA pin will still not have any FSK decoding data until
enough energy and timing (about 12.5ms) FSK mark bits time have been checked. The
details timing about DATAOUT, SHORTDATA and /CD will be shown on Timing
Diagram for FSK timing.
________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
1998
~5~

6 Page









EM92547B pdf, datenblatt
EM92547A/B/D
CALLER ID FSK DECODER
EM92547D :
TIP
RING
4700p
4700p
0.1u
250V
0.1u
250V
30k
30k
470k
18k
Vdd 0.1uF
EM92547D
Tip 1
Ring 2
Ring det1 3
Ring det2 4
/Ring time 6
NC 5
/PWR UP 7
Vdd VSS 8
16 Vdd
15 SHORTDATA
13 /CD
12 /RD
47k
11 NC
10 OSCIN
9 OSCOUT
47k
270k
0.22u
15k
8-bit MCU
1M 33p
3.58M
33p
LCD
DISPLAY
________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
1998
~ 11 ~

12 Page





SeitenGesamt 13 Seiten
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