263 lines
8.6 KiB
Plaintext
263 lines
8.6 KiB
Plaintext
Submitted by: /\/\yotis
|
|
|
|
CandyMan:
|
|
|
|
Greets from a fellow hacker from Georgia! I have included the following from
|
|
the /\/\otorola technical semiconductor data book:
|
|
|
|
Part Number: MC145477P (16-pin plastic dip) , MC145477DW (SOIC 16-pin surface
|
|
mount).
|
|
|
|
Type: Calling line identification (CLID) receiver with ring detector
|
|
|
|
|
|
The MC145477 is a silicon gate HCMOS IC designed to demodulate Bell 202
|
|
and V.23 1200-baud FSK asynchronous data. The primary application for this
|
|
device is in products that will be used to receive and display the calling
|
|
number, or message wating indicator sent to subscribers from central office
|
|
facilities of the public switched network. The device also contains a carrier
|
|
detect circuit and ring detector which may be used to power up the device.
|
|
|
|
Applications for this device include adjunct boxes, answering machines,
|
|
feature phones, fax machines, and computer interface products.
|
|
|
|
The MC145477 offers the following performance features:
|
|
|
|
-Ring Detector On Chip
|
|
-Ring Detector Output for MCU Interrupt
|
|
-Power Down Mode, Less than 1#a
|
|
-Single Supply: +3.5 to 6.0 V
|
|
-Pin Selectable Clock Frequencies: 3.68 MHz, 3.58 MHz, or 455 kHz
|
|
-Two Stage Power Up for Power Management Control
|
|
-Demodulates Bell 202 and V.23
|
|
|
|
|
|
+------------+
|
|
TI ++1O 16++ Vdd
|
|
++ ++
|
|
RI ++2 15++ DOC
|
|
++ ++
|
|
RDI1 ++3 14++ DOR
|
|
++ ++ ___
|
|
RDI2 ++4 13++ CDO
|
|
++ ++ ___
|
|
NC ++5 12++ RDO
|
|
__ ++ ++
|
|
RT ++6 11++ CLKSIN
|
|
_____ ++ ++
|
|
PWRUP ++7 10++ OSCin
|
|
++ ++
|
|
Vss ++8 9++ OSCout
|
|
++ ++
|
|
+------------+
|
|
|
|
-------------------------------------------------------------------------------
|
|
|
|
Pin Descriptions:
|
|
|
|
TI: Tip Input (Pin 1)
|
|
|
|
This input pin is normally connected to the tip side of the twisted pair.
|
|
It is internally biased to 1/2 supply voltage when the device is in the
|
|
power up mode. This pin must be DC isolated from the line.
|
|
|
|
|
|
|
|
RI: Ring Input (Pin 2)
|
|
|
|
This input pin is normally connected to the ring side of the twisted pair.
|
|
It is internally biased to 1/2 supply voltage when the device is in the
|
|
power up mode. This pin must be DC isolated from the line.
|
|
|
|
|
|
|
|
RDI1: Ring Detect Input 1 (Pin 3)
|
|
|
|
This input is normally coupled to one of the twisted pair wires through
|
|
an attenuating network. It detects energy on the line and enables the
|
|
oscillator and precision ring detector circuitry.
|
|
|
|
|
|
|
|
RDI2: Ring Detect Input 2 (Pin 4)
|
|
|
|
This input to the precision ring detection circuit is normally coupled to
|
|
one of the twisted pair wires through an attenuating network. A valid ring
|
|
___
|
|
signal as determined from this input sends the RDO (Pin 12) to a logic 0.
|
|
|
|
__
|
|
RT: Ring Time (Pin 6)
|
|
|
|
An RC network may be connected to this pin. The RC time constant is chosen
|
|
to hold this pin voltage below 2.2v between the peaks of the ringing
|
|
__
|
|
signal. RT is an internal power-up control and activates only the
|
|
circuitry
|
|
neccessary to determine if the incoming ring is valid
|
|
|
|
|
|
_____
|
|
PWRUP: Power Up (Pin 7)
|
|
_____
|
|
A locic 0 on the PWRUP input causes the device to be in the active mode
|
|
ready to demodulate incoming data. A logic 1 on this pin causes the device
|
|
__
|
|
to be in the standby mode, if the RT input pin is at logic 1. This pin may
|
|
___ ___
|
|
be controlled by RDO and CDO for auto power-up operation. For other app-
|
|
lications, this pin may be controlled externally.
|
|
|
|
|
|
Vss: Ground (Pin 8)
|
|
|
|
Ground return pin it typically connected to the system ground.
|
|
|
|
|
|
|
|
OSCout: Oscillator Output (Pin 9)
|
|
|
|
This pin will have either a crystal or ceramic resonator tied to it with
|
|
the other end connected to OSCin.
|
|
|
|
|
|
OSCin: Oscillator Input (Pin 10)
|
|
|
|
This pin will have either a crystal or ceramic resonator tied to it with
|
|
the other end connected to OSCout. OSCin may also be driven directly from
|
|
an appropriate external source.
|
|
|
|
|
|
|
|
CLKSIN: Clock Select Input (Pin 11)
|
|
|
|
A logic 1 on this input configures the device to accept either a 3.579 Mhz,
|
|
or a 3.6864 Mhz crystal. Note 3.579 Mhz is known as a "Color Burst"
|
|
crystal, and is readily available from Radio Shack. A logic 0 on this pin
|
|
configures the part to operate with a 455-kHz resonator.
|
|
|
|
|
|
___
|
|
RDO: Ring Detect Out (Pin 12)
|
|
|
|
This open-drain output goes low when a valid ringing signal is detected.
|
|
___
|
|
RDO remains low as long as the ringing signal remains valid. This signal
|
|
can be used for auto power up, when connected to pin 7.
|
|
|
|
|
|
|
|
___
|
|
CDO: Carrier Detect Output (Pin 13)
|
|
|
|
When low, this opwn drain output indicated that a valid carrier is present
|
|
___
|
|
on the line. CDO remains low as long as the carrier remains valid. An 8-ms
|
|
hysteresis is built in to allow for a momentary drop out of the carrier.
|
|
___ _____
|
|
CDO may be used in the auto power up configuration when connected to PWRUP.
|
|
|
|
|
|
|
|
DOR: Data Out Raw (Pin 14)
|
|
___
|
|
This pin presents the output of the demodulator whenver CDO is low. This
|
|
data stream includes the alternate 1 and 0 pattern, and the 150 mS of
|
|
marking, which precedes the data. All other times, DOR is held high.
|
|
|
|
|
|
|
|
|
|
DOC: Data Out Cooked (Pin 15)
|
|
___
|
|
This output presents the output of the demodulator whenever CDO is low,
|
|
and when in internal validation sequence has been successfully passed.
|
|
The output does not include the alternate 1 and 0 pattern. At all other
|
|
times DOC is held high.
|
|
|
|
|
|
Vdd: Positive Power Supply (Pin 16)
|
|
|
|
The digital supply pin, which is connected to the positive side of the
|
|
power supply.
|
|
|
|
|
|
|
|
-------------------------------------------------------------------------------
|
|
Applications Information:
|
|
|
|
The MC145477 has been designed to be one of the main funcional blocks in
|
|
products targeted for the CLASS (Custom Local Area Signaling Service) market.
|
|
CLASS is a set of subscriber features now being presented to the consumer by
|
|
the RBOC's (Regional Bell Operating Companies) and independant TELCOs. Amoung
|
|
CLASS features, such as distinctive ringing and selective call forwarding, the
|
|
subscriber will also have available a service known as Calling Number Delivery
|
|
(CND) and message waiting. With these services, a subscriber will have the
|
|
ability to display at a minimum, a message containing the phone number of the
|
|
calling party, the date, and the time. A message containing only this infor-
|
|
mation is known as a single format message, as shown in figure 9. An extended
|
|
message, known as multiple format message, can contain additional information
|
|
as shown in figure 10.
|
|
|
|
The interface should be arranged to allow simplex data transmission from the
|
|
terminating central office, to the CPE (Customer Premises Equipment), only when
|
|
the CPE is in an on-hook state. The data will be transmitted in the silent
|
|
period between the first and second power ring after a voice path has been
|
|
established.
|
|
|
|
The data signaling interface should conform to Bell 202 which is described as
|
|
follows:
|
|
|
|
-Analog, phase coherent, frequency shift keying.
|
|
-Logical 1 (Mark) = 1200 # 12 Hz
|
|
-Logical 0 (Space) = 2200 # 22 Hz
|
|
-Transmission rate = 1200 bps
|
|
-Application of data = serial, binary, asynchronous
|
|
|
|
The transmission level from the terminating C.O. will be -13.5 dBm #1.0. The
|
|
expected worst case attenuation through the loop is expected to be -20 dB. The
|
|
receiver therefore, should have a sensitivity of approximately -34.5 dBm to
|
|
handle the worst case installations.
|
|
|
|
Additional information on CLASS services can be obtained from:
|
|
|
|
BELLCORE CUSTOMER SVS.
|
|
1-800-521-2673
|
|
201-699-5800 Foreign Calls
|
|
201-699-0936 FAX
|
|
|
|
The document number is TA-NWT-000030
|
|
|
|
Title: "Voice Band Data Transmission Interface Generic Requirements"
|
|
|
|
|
|
-------------------------------------------------------------------------------
|
|
|
|
Please see CNID.GIF for schematic......
|
|
|
|
|
|
|
|
Cya l8r
|
|
|
|
/\/\yotis (Ruler of the UnderWurlde)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
--- Blue Wave/Max v2.12 [NR]
|
|
|
|
|