APPLICATION NOTE
PHONE REMOTE SYSTEM
AN488/0695
By Joël HULOUX, Patrice MOREL
CONTENTS Page
I INTRODUCTION....................................................... 2
I.1 GENERAL PURPOSE. . . . . . . . . . . . . . . . ................................... 2
I.2 DESCRIPTION. . . . . ................................................... 2
I.3 IMPROVEMENTS...................................................... 2
II POWERLINE COMMUNICATION USING ST7537CFN ........................ 2
II.1 C.S.M.A.TIMINGS . . ................................................... 2
II.2 SOFT CARRIER DETECTOR. . . . . . ....................................... 4
II.3 IMPLEMENTATIONONST6265.......................................... 5
III PHONEREMOTE SYSTEM .............................................. 6
III.1 GENERALDESCRIPTION . . . . . . . . . . . . . . .. . . . . . . . . . . . . ................... 6
III.2 TELEPHONE LINEINTERFACE . . . . . . . . . . . . . ............................. 8
III.2.1 Isolation. .. . . . . .. . .. . . . . . . . . . . . ....................................... 8
III.2.2 Input Impedance .. . . ................................................... 9
III.2.3 CurrentRegulation . . . . . . . . . . . . . . ....................................... 9
III.2.4 Hook-off Procedure. .. . . . . . . . . .......................................... 9
III.3 MAINS FLOW. . . . . . .. . . . . . . . . . . . . . .. . .. . . . . . . . . . . . . ................... 10
III.4 APPLICATIONPROCEDURE. . . .......................................... 12
III.4.1 Installation. . . ......................................................... 12
III.4.2 Description . .......................................................... 12
III.4.3 Use . . . . . . . . . . . . . . . . . ................................................ 12
IV CONCLUSION ........................................................ 13
V ANNEXE 1 : BILL OF MATERIALS . . . . .. . .. . . . . . . . . . . . . ................... 14
VI ANNEXE 2 : SCHEMATICS. ............................................. 15
1/16
I - INTRODUCTION
I.1 - GeneralPurpose
In the ApplicationNote AN535, we described how
to implement the basis of a power line network
usingthededicatedmodemchipST7537CFN.This
network has beenvalidatedwith ST7537MASTER
& SLAVE systems, and shows the feasibility of
power line control.But Home automation systems
allow more than switching a light, or changingthe
value of a digit. The possibilities of the network
increaseeach time we connecta new device on it.
For instance, adding a phone remote system will
allow the remote (from anywhere on the planet)
control of devices connected on the networkonly
by callingyour house.The phoneremote systemis
now demonstratingthisfact : atelephoneinterface
that allows the householderto give instructions to
appliancesfromoutside.
I.2 - Description
The phone remote system is a device connected
to bothtelephoneline and power line network.It is
able to detect the phone ring, to hang up the line,
and ”converse”withthehouseholder.Thisdialogue
is done by using the DTMF (digital tone multi-
frequency) generated by the remote phone. To
answerback,thephoneremote systemisbeeping.
Of course,thisis a low cost choice andthe system
can be improved by using a voice synthesiser with
on line help andso on...
PHONE
REMOTE
SYSTEM REMOTE
OBJECT 2
Mains
Telephone
Line
REMOTE
OBJECT 1
AN488-01.EPS
Figure 1 : Phone RemoteSystem Connected
to the Power Line Network
In a classical electric installation, this device would
have used one control cable for each controlled
object.Withpowerlinecontrol,youjusthavetoplug
it and the link isdone with all devices controlledby
mains network.
I.3 - Improvements
The part II describes several improvements done
to the communication program explained in
AN535.Thesemodifications allow new features :
- softwarecarrierdetect,
- C.S.M.A.timings(Carrier SenseMultiple Access),
and the use of communication modules in phone
remote program.
II - POWER LINE COMMUNICATION USING
ST7537CFN
TheST7537 CFNpower line modem complieswith
the regulation described in the CENELEC
EN50.065-.1 document, (so frequency, bit coding
and otheruseful features are included in the chip).
Nevertheless,the designerofan applicationhas to
take in account the power line communication
specification when writing his protocol. For in-
stance, access protocols are required for coexis-
tence on the medium.
II.1 - C.S.M.A. Timings
The following paragraphs give a concrete case of
communicationon powerline network.In first, only
2 devices are connected to the network. Then,
othersdevices are connected,and we will be con-
frontedto a real networkspecification.
Communication between 2 units
This is the simplest case of communication.Only
twodevicesareabletosendandreceivepacketon
thenetwork.Oneunitsendsanorder,theotherone
isreplying withan acknowledge(see Figure2).
TheunitTchecksthatthenetworkisfreeforaccess
thanks to the Carrier Detector, then it sends its
frame and waits an acknowledge during a delay
Twack. The unit R receive a frame and sends an
acknowledgeif R is the destinationof the frame.R
mustsend the ack. framebefore the endof Twack.
If it is not the case, or if T has not received the
acknowledge, T tries again to send the order. Of
course the frame format must allows error detec-
tion by the receiver (order checksum) an by the
transmitter(checksuminack.frame).Inmostofthe
case,communication occurs without error,and the
both units must keep silent for a delay Tsilent in
order to leave time for application control. To allow
thetwo unitsto transmit,the unitThasto waitmore
than R, so R willbe the first to take the channel if
it needs to transmit.
If the two units send a frame exactly at the same
time, they will not receive ack. frame, so they will
retryafteradelay(Twack). Arandomvalueisadded
ST7537
PLM
COM.
Unit T Unit R
Order Frame
Ack. Frame
Mains
ST7537
PLM
COM.
AN488-02.EPS
Figure 2 : Two Units on the Mains
PHONE REMOTE SYSTEM APPLICATION NOTE
2/16
Message Messageto U2
Tretans Twack
U3 wants
to transmit
U4 wants
to transmit
Tsilent (Priority)
Messageto U5
Tsilent(Priority) Tsilent (Priority)
Ack.
Ack.
Message
U1
U2
U3
U4
U5
AN488-04.EPS
Figure 4 : PowerLine CommunicationData Timing
to make one of the two unit faster than the other
one. The total delay is Tretrans.
Communication with severalunits
ST7537
PLM
COM.
Unit 4 Unit 1
Order Frame
Ack. Frame
Mains 50/60Hz
ST7537
PLM
COM.
ST7537
PLM
COM.
Unit 3
ST7537
PLM
COM.
Unit 2
AN488-03.EPS
Figure 3 : SeveralUnits on the Mains
With several units, thetimingis the same,buteven
if a unit is not concerned with a communication,it
hasto getthe framesin accountfor timing control.
For instance,it has to reload itstime to keep silent.
Andif severalunits have reload there time to keep
silent at the end of a communication, the values
reloaded must bedifferentto avoid conflicts onthe
next communication. Again, a random value is
added to make timing different. Here is a data
timingchartofthetransmittedsignalofthedifferent
units (see Figure 4). Anyway, all units must send
there message in less thantwo seconds.
Timing control
All these timing are resumed in the Table 1.
Table 1 : C.S.M.A.Timing
Symbol Description Time Comment
Tmax Total duration of transmission 2s
Maximum duration of transmission after Starting 1s Featureincluded in
ST7537CFN
TsilentR Length to wait from the end of a remotetransmission to
initiate a transmission 85 .. 125ms Al least 7 values
Twack Acknowledge sent after 0 .. 30ms
Tretransmit Retry transmitting 30 .. 72ms
TsilentT Duration betweentwo transmissions of the same device 125ms
PHONE REMOTE SYSTEM APPLICATION NOTE
3/16
In orderto implement these timing, an easy way is
to use a single timer and several registers corre-
spondingto the differentdelaysyou want to count.
The timer will decrease the registersat eachover-
flow, and the counters are”launched” by loading a
valuein the correspondingregister.
This access protocol allows an additional network
priority: if you allow unit 1 (U1) to transmit before
unit2(U2), thenU1will alwayssends its messages
before U2, and so will have a highest network
priority. By choosingtherange of TsilentRof a unit,
you will then choose its priority.
Table 2 : Priority According to TsilentR
Range Priority
85 .. 94ms Highest priority
95 .. 104ms Standard priority
105 .. 115ms Lowest priority
II.2 - Soft Carrier Detector
We have seen that by programming theTxD to ”0”
in receivemode we increase the sensitivity of the
ST7537becausethere isno moreclampingbyCD.
Youwill be able to havegood communicationwith
a receive signal of around 50dBµV whichmeans a
dynamicof around 70dB.
Becausewewanttogetthebenefitof theverygood
sensitivity of the ST7537 , we will program Txd to
”0” in receive mode and create by soft a frame
detector . We will use the CD signal as mentioned
by CENELEC only when we want to transmit a
frame . Different software frame detectors can be
implemented depending of the resources of your
microcontroller. You can program your microcon-
RxD
FRAME
RANDOM DATAS DATAFFh”1”
AN488-06.EPS
Figure 6 : PreambleDetector
RxD PREAMBLE EXPECTED BYTE
FRAMERANDOM DATAS
AN488-05.EPS
Figure 5 : Rxd Data Timing
troller to go in receive frame when it received the
expectedbyte.
Sothe preambleis fordemodulatortraining (when
you start a communicationthe 3 first bits are lost
by the receiver) and when you will match with
expectedbytethe micro-controllerwillgoinreceive
frame routine.
On the ST6 microcontroller we have implemented
the following framedetector.
We putTxd= ” 1” onthe transmitterfor around4ms
(for demodulator training) and after we send in
asynchronousmode FFh followingbythe complete
frame.Onthereceiver,wecheckthatwehaveRxD
equal to ”1” for at least 7ms (we are looking for
FFh),thenwego in receiveand wewill have frame
synchronisation on the first start bit of the data.
We did a trial in our lab with this system during 2
hours without having the ST6 going in frame re-
ceive routine on bad datas due to noisesignal.
PHONE REMOTE SYSTEM APPLICATION NOTE
4/16
II.3- Implementation on ST6265
The C.S.M.A. (Carrier Sense Multiple Access)
needs a Timer for its implementation. But the
ST6265 timer 1 is already used for bit time and
software carrier detect. Furthermore, sometimes
the timer has several functions at the same time,
so the timer programming becomes very compli-
cated.
In order to simplify this programming, we have
implementeda single time delaycorrespondingto
bit time (f = 1200Hz). So for each mode thereis a
countercorrespondingto adelay.Thecountersare
incremented(ordecremented)in the timerinterrupt
routine while they are cleared (or affected with
values) in main program. For C.S.M.A. specifica-
tions, weuse two counters:
- Xmit_count: This is the delay before retransmit-
ting,
- Rmit_count: Thisis the delaybeforetransmitting
after a reception.
These counters are decrementedin Timer 1 inter-
rupt routine and flags are set when they become
null. These flags are allowing the sending of a
frame. Acknowledge frames are not concerned
with these timing.
The timer will allow the sending of a frame after
C.S.M.A.delays(see Figure7).
With this way of programming, the places where
counters are loaded are very significant (see Fig-
ure 8) :
- Xmit_countis loaded at the end of the message
sending procedure in order to wait an acknow-
ledge (30ms) and atthe endof thereceptionof a
good acknowledge(time between two transmis-
sionsof the samedevice: 125ms),
- Rmit_count is loaded at the end of a reception
with arandomvalue (time betweentwo transmis-
sion of differentdevices : 85 to 115ms).
SEND_FRAM
RECEIPT_FLAG
SET ?
XMIT_FLAG
SET ?
RMIT_FLAG
SET ?
SEND_TRAM
RET
No
No
No
Yes Yes
AN488-07.EPS
Figure 7 : Sendinga Frame After C.S.M.A. Delays
RETI
6
XMIT
COUNTER = 0
3
RxD HIGH?
8
RMIT
COUNTER = 0
2
TIMER1
4
INCSOFTCD
COUNTER
4
INCSOFTCD
COUNTER
Yes
No 11
PREAMBLE
DETECTED
Yes
12
SETRECEIVEFLAG
7
DECRMIT
COUNTER
Yes
Yes
No
9
SETRMITFLAG
10
SETXMIT FLAG
AN488-08.EPS
Figure 8 : Timer1 Flow Chart
PHONE REMOTE SYSTEM APPLICATION NOTE
5/16
III - PHONE REMOTE SYSTEM
III.1 - GeneralDescription
ThephoneremotesystemisusingtheST7537CFN
chip and its line interfacefor power line communi-
cation (see Figure 9). The control unit is ST6265
microcontroller(SGS-THOMSON)thathasseveral
functions.
The telephone interface is described in further
detail innextparagraph.The MCU mains functions
are :
- detecta ring,
- take the line and hang up,
- decodeDTMF code,
- make some”beep”,
- control the modemchip,
- displayits status (leds for instance).
These functionsare the minimumrequired to pro-
Telephone Line
MCUST5265
MAINS INTERFACE :
P.L.M. COMMUNICATION WITH ST7537CFN
TELEPHONE
INTERFACE
AN488-09.EPS
Figure 9 : BlockDiagram
C0
C1
C2
C3
C4
NMI
RES
OSO
A7
A6
A5
A4
A3
OSI
A2
A1
VSS
VDD
A0
B7
B6
B5
B4
B3
B2
B1
B0
TES
VCC
%2
ST7537CFN + POWER LINE INTERFACE
RxD
TxD
Rx/Tx
RSTO
MCLK
/WD
/CD
ST6265
SOUND
GENERATION HOOK-OFF RING
DETECT
DTMF DECODER
Q1
Q2
Q3
Q4
STD
Push Button
AN488-10.EPS
Figure 10 : ST6265Application
vide remote control. The Figure 10 propose these
functions.
PHONE REMOTE SYSTEM APPLICATION NOTE
6/16
ST7537 interface
The ST6265 is directly connected to ST7537, ex-
ceptedthe clock that mustbe divided bya factor 2
(ST6265 is validated at 8MHz max. and ST7537
provides a 11MHz clock signal). For further details,
refer toAN535.
Hook-off
The hook-offsystem must be ableto takethe line.
Arelay connectedto thetwo wires ofthetelephone
line complies with all regulations. See telephone
interface part for more information.
HOOK-OFF
LINE2
LINE1
LINE
PHONE
AN488-11.EPS
Figure11 : Hook-off Schematic LINE
RING
DETECT
AN488-12.EPS
Figure 12 : Ring Detect Schematic
AN488-13.TIF
Figure 13 : Ring Detect Signal& RingDetect Signal Zoomed
Ring Detect
An opto-transistor is used to detect the ring signal
on the line. So the systemis isolated from the line
and the microcontrollerreceive a 0 to 5V signal.
For example, this is what appears on ring detect
pin with a French standardline (see Figure 13).
The first line is the ring detect signal which is
zoomed on the second line. On French lines, the
ring is about 1.5 second and the silence is about
3.5second.Thatmeansaring periodof5seconds.
PHONE REMOTE SYSTEM APPLICATION NOTE
7/16
Sound Generation
Sound generation allows reply from the system.
MCU justsends square signalthat makes a beep.
SIGNAL 1
SOUND
GENERATOR
VCC
AN488-14.EPS
Figure14 : Sound GenerationSchematic
DTMF Decoder
Users send orders with DTMF code. These codes
are decoded with a DTMF receiver LC7385
(SANYO). It is configured in single ended input. It
has a dynamic range input of 29dBM.
1
2
3
4
5
6
7
8
910
16
17
18
11
12
13
14
15
SIGNAL 2
To
MCU
VCC
VSS
VREF
VDD
IN+
IN-
GS
B/H
PD
OSC1
OSC2
ST/GT
EST
STD
Q4
Q3
Q2
Q1
TOE
AN488-15.EPS
Figure 15 : SingleEnded Input Configuration
Tone#n
DTMF Input
Datas
Tone #n+1
Decoded tone #n Decodedtone #n+1
StD
T1 T2 T1 = 40ms
T2 = 4.5µs
AN488-16.EPS
Figure 16 : DTMF Receiver Timing Diagram
When receiving DTMF code, this IC chip is gener-
atingthe following signal (see Figure 16).
III.2 - Telephone Line Interface
The line interfacemust verify regulation of system
connected to telephone line, that’s why it is de-
scribed in detail here. Line interface input imped-
ance andcurrentconsumption has beenadjusted.
In the followingschematic, the transformeraccept
continuous current and current consumption is
done by a resistorand a capacitor in parallel.
RELAY
Ri
SIGNAL 1
SIGNAL 2
W1
AN488-17.EPS
Figure 17 : TelephoneLine Interface
III.2.1-Isolation
As the phone remote system is connected to the
telephone line, it must be isolated from high volt-
ages that may occurson it. There aretwo connec-
tionsto theline :
- the ring detect interfaceis isolatedwith an opto-
transistor,
- the DTMF & soundgenerationinterface isolation
is made bya transformer anda voltage limitation
by zener diodes.
Furthermore, a transil diode between the two line
wires limits the input voltage.
PHONE REMOTE SYSTEM APPLICATION NOTE
8/16
III.2.2 - Input Impedance
The inputimpedancehasbeen adjustedby chang-
ing RI value (see Figure 17) with a Wheastone’s
bridge methodexplained in the Figure 18.
e is generated by a HP3325B generator and u is
read ona Fluke 45controller.We madee scanning
frequency from 300 to 4000Hz. The maximum
values for u areshown in the Table3.
Table 3 : Error Voltageversus Ri
Ri (Ω) u (mV) Ri (Ω) u (mV) Ri (Ω) u (mV)
200 69 325 40 400 47
275 44 350 41 500 63
300 40 375 45 600 75
Ri hasbeenfixedat300Ω. That mean an adapting
coefficient(alpha):
alpha = 20 log 1
2⋅0.04 =21dBm
French standard specifies a value superior to
14dBm.
V
e
u
R
RR
PHONE
REMOTE
SYSTEM
R=600Ω
e = 1000mV
alpha = 20 log e
2u
AN488-18.EPS
Figure 18 : WheastoneBridge
80
70
60
50
40
30200 300 400 500 600
u(mV)
R(
Ω
)
AN488-19.EPS
Figure 19 : Error Voltage Versus Ri
III.2.3 - Current Regulation
Line current regulation is not needed in several
countries. For these countries, a strap allows to
disable currentregulation which isdone by a CTP
resistor.
III.2.4 - Hook-off Procedure
When taking the line, the system must care of the
ring train.If it takesthe linewhen phoneis ringing,
the relay will switch a voltage superior to 70 Volts.
Toavoid this, the bestway is to wait a silence (no
ring). The phone remote system is waiting the end
ofa ringto takethe line, as shownin the Figure20.
The first line is therelay command and the second
lineis the ringsignal.
AN488-20.TIF
Figure 20 : Hook-off Between Two Rings
PHONE REMOTE SYSTEM APPLICATION NOTE
9/16
III.3 - MainsFlow
The phone remote system has a very simple pro-
gress. It only has to wait after a ring, count for a
pre-defined number of rings, take the line, ask for
a password,andthen send theuser’s ordersonthe
Telephone
call
Good password
Wait
3 rings
Hold
the line
Password
Dialog
Bad password
Order(s)
Dialog
Hang-up
reti
Hang-up
AN488-21.EPS
Figure 21 : PhoneProgramMain Flow
powerline network(see Figure 21).
For securityreasons, the user has only three tries
to enter his password.If this operation is success-
ful, he is allowed to send orders, otherwise the
system hangsup (see Figures 22 and 23).
Set
good_pswd
Flag
Password
Dialog
Enter
First Code
Enter
Second Code
Enter
Third Code
Enter
Fourth Code
ret
Yes
Good
Password
?
Third
Trie
?
No
AN488-22.EPS
Figure 22 : PasswordDialogue
PHONE REMOTE SYSTEM APPLICATION NOTE
10/16
Answer
to User
Order(s)
Dialog
Get Objet
Address
Get Order
Time_out
Time_out
ret
Phone
Order Execute
Order
Send Order
AN488-23.EPS
Figure 23 : Orders Dialogue
PHONE REMOTE SYSTEM APPLICATION NOTE
11/16
III.4 - Application Procedure
Thispartdescribesinstallationandutilisationofthe
phone remote system.
III.4.1 - Installation
The phone remotesystem needs to be connected
to the mains and to the telephone line.
Connecting to mains:
Before connecting the phone remote system to
mains, verify that the selected voltageis the same
as your mains installation. The default voltage is
220 Volts/50Hz.
Connecting to telephoneline :
The telephone line connectoris a RJ11 type. This
connector is wired according to French specifica-
tions.
III.4.2 - Description
The phone remote system owns several switches
and LEDs that indicate status and allow the con-
figurationof parametersas number of rings, confi-
dential code, ...
Table 4 : PartsDescription
Part Description
Switch User for switch the device ON/OFF
Mini switch User to select the delay before
hook-off : 3 or 5 rings
Push button User to reinitialize the status LEDs
(single push) or to reinitialze the
protection code (3 seconds push)
Red LED (L1) Violation LED (wrong code)
Green LED (L3) Hook-off LED
Yellow LED (L4) Ring LED
Orange LED (L2) Bad power line network address :
no acknowledge
III.4.3 - Use
EnterConfidential Code
When calling the phone remote system, you have
to wait three or five rings. Then the systemhooks
off and beeps three times. You have twenty sec-
onds to enter the confidential code by using your
1
1 : Unused
2 : Phone
3 : Line
4 : Line
5 : Phone
6 : Unused
23456
AN488-24.EPS
Figure 24 : RJ11 Connector
phone keyboard. Only DTMF phones are sup-
ported. The initial value of the code is 0000, but of
courseyou canchangeit. If thecodeenteredis the
good one, you are allowed to give orders. Other-
wise, you have two other attempts.
Enter Orders
An order is an object address (two digits), an
application number (one digit) and a value (one
digit). After you have entered the objet address,
youhear three beeps (or you have to retry).Then
you enter the application number, and you hear
threemore beeps.At last,youenter theapplication
value. If you hear three beeps, that means the
message has been sent and that an acknowledge
has been received. Then you are allowed to send
an other order.
Address Appli.
Number
2 digits 3 beeps 1 digit 3 beeps
Appli.
Value
1 digit 3 beeps
AN488-25.EPS
Figure 25 : AddressFormat
The slave sytems have address values from
00to15.Forthesesystems theapplicationnumber
select the dimmer (number 1) or the digit (num-
ber 2). The value is the number diplayed on the
digit, or the light intensity. For instance :
- ”15,2,0” will display 0 on the slave system wich
address is 15,
- ”13,1,9” will switch the light on slave system
number13 on.
There are special orders for phone control :
- if youenter ”99,1”, thenthe system will beep you
the confidentialcode. If the codeis 3456,youwill
hear 3 beeps then four, then five and then six
beeps,
- if youenter”99,2”,andfourdigits,thesefourdigits
willbethe newconfidential code to use forfurther
call.
Table 5 : AllowedOrders
Enter Values Action
XX,Y,Z 00 ≤XX ≤15
0≤Z≤9Y = 1 Light
intensity = Z
Y = 2 Display
value = Z
99,1 Beeps the
confidential code
99,2,XXXX 0000 ≤XXXX ≤9999 New value for
confidential code
PHONE REMOTE SYSTEM APPLICATION NOTE
12/16
Local Configuration
The yellow LED is lighting when ”the phone is
ringing”. After 3 or 5 rings (depending on mini-
switch), the system takes the line, and the green
LED remains on during all the phone dialogue. If
three bad codes are sent, the red LED will switch
on. Ifapowerlinecommunication erroroccurs,the
Orange LEDwill light. Thered and the orange LED
will be left on, so a single push on the push-button
will switch theseLED off.
Ifyoupushon thepush-buttonformore than3 sec-
onds, the confidential code will be changed to
0000.TheconfidentialcodeisstockedinEEPROM
and will remainseven if youdisconnect mains.
IV - CONCLUSION
The phone remote system increases the facilities
offered byyour automationnetwork.With this sys-
tem you cansend ordersby using DTMF code.By
using a memory phone or a pocket dialler, you
would be able to sendorders onlyby choosing the
system you want to talkto. For instance, you push
the button called ”heating on” and the order is
immediately sent to the heater. Furthermore, you
could select an other temperature for the heating
system, or ask for the temperature in any room of
your house. These improvements are possible by
adding a voice generator (SGS-THOMSON has
dedicated voice chips) and if temperature sensor
and heater are connected to the network. The
phone remote systemdetailed in this note has not
all these facilities, but it is a very low cost applica-
tion with onlyfew componentsandlowcost choice
for MCU and phone interface.The ST7537is pro-
viding the power line communication and a hard-
ware watchdog,while leaving resources for a low
cost microcontroller.
PHONE REMOTE SYSTEM APPLICATION NOTE
13/16
V - ANNEXE 1 : BILLOF MATERIALS
Designation Value Package
BP1 BP BP
C1 1mF CAPC4
C2 22pF CAPD4
C3 22pF CAPD4
C4 6.8nF CAPD4
C5 1µF CAPC4
C6 100nF CAPD4
C7 100nF CAPD4
C8 100nF CAPD4
C9 100nF CAPD4
C10 2.2µF CAPC4
C11 2.2µF CAPC4
C12 100nF CAPD4
C13 10µF CAPC4
C14 100nF CAPD4
C15 10µF CAPC4
C16 1000µF CAP12
C17 100nF CAPD4
C18 100nF CAPD4
C19 1mF CAPC4
C20 10µF CAPC4
C22 100nF CAPD4
C23 2.2mF CAPC4
C24 100nF CAPD4
C25 100nF CAPD4
C26 100nF CAPD4
C27 100nF CAPD4
C28 470nF CAPD4
D1 Diode DIODE
D2 Diode TRANSIL
D3 1N4004 DIDB8
D4 1N4004 DIDB8
D5 1N4004 DIDB8
D6 1N4004 DIDB8
D7 1N4148 DIDA8
D8 ZEN.4.7V DIDA8
D9 ZEN.4.7V DIDA8
D10 ZEN.15V DIDA8
D11 ZEN.15V DIDA8
G1 GEMOV GEMOV
IC1 ST7537 ST7537
IC2 ST62E65 ST62E65
IC3 LM7805 BTO220
IC4 74LS74 DIL14
IC5 LM7810 BTO220
IC6 LC6385 DIL18
IC8 4N36 DIL6
K1 RELAY_DPDT RELAY
LD1 LED LED
LD2 LED LED
Designation Value Package
LD3 LED_JAUNE LED
LD4 LED_VERTE LED
P1 ALIM220V ALIM220V
P2 RJ11 RJ11
Q1 2N2222 BTO922
Q2 2N2222 BTO922
Q3 2N2907 BTO5
Q4 2N2222 BTO922
Q5 2N2907 BTO5
Q6 2N2907 BTO5
Q7 BC547 BTO5
Q8 BC547 BTO5
R1 1mΩRES8
R2 1kΩRES8
R3 2.2ΩRES8
R4 2.2ΩRES8
R5 2.2ΩRES8
R6 47kΩRES8
R7 180ΩRES8
R8 1kΩRES8
R9 47kΩRES8
R10 2.2ΩRES8
R11 180ΩRES8
R12 2.2ΩRES8
R13 4.7kΩRES8
R14 4.7kΩRES8
R15 220ΩRES8
R16 220ΩRES8
R17 470Ω3W RES14
R18 1.5kΩ1W RES12
R19 300ΩRES8
R20 100kΩRES8
R21 100kΩRES8
R22 560ΩRES8
R23 2.2kΩRES8
R24 4.7kΩRES8
R25 300kΩRES8
R26 220ΩRES8
R27 4.7kΩRES8
R28 10kΩRES8
R29 100kΩRES8
SW1 MINI_DIP SMINI
SW2 COMMUT COMMUT
SW3 MINI_DIP MINI
TR1 TOKO TOKO
TR2 UI30X10.5 UI30X10.5
TR3 TR3 TRANSFO CECLA
W2 STRAP_3PTS STRAP
XT1 CRYSTAL CRYSTAL
XT2 3.57945MHz HC49U
PHONE REMOTE SYSTEM APPLICATION NOTE
14/16
VI - ANNEXE 2 : SCHEMATICS
1
2
4
5
6
7
8
9
10
16
17
18
19
20
26
27
28
13
14
15
21
22
23
24
25
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
11 12
VDD VSS
OSCIN
OSCOUT
PC4
PC3
PC1
PC2
PC0
NM1
OAOAO
IC2
ST62E65
9
8
Q
N-
10
12
11
13
D
CLK
PR
CL
IC4B
74LS74
+5V
+5V
+5V C17
100nF
12
B7
B4
B3
B2
B1
B0
A3
A2
+5V +5V
R16
220ΩR15
220Ω
LD2
LED LD1
LED
Q
N-
D
CLK
PR
CL
IC4A
74LS74
6
5
4
2
3
1
+5V
2
3
5
6
7
8
9
10
16 17
18
19
20
2627
28
11
12
13
14
15
21
22
23
24
25
MCLK
WD/
RX/TX/
CD/
TXD
RXD
RSTO
DVCC
1VCM
AVSS DVSS XTAL1 XTAL2
TEST4
TEST3
TEST2
TEST1
PABC
PABC/
AT0
PAFB
RA1
AVDD DVDD DEM1 IF0 TXF1
IC1
ST7537
R13 4.7kΩ
SW1
MINI DIP
R14 4.7kΩBP1
BP 21
+5V
1
2
2
1
+5V
1
2
C18
100nF C20
10µFC6
100nF
IC4
21
2
1C2
22pF
2
1C3
22pF
XT1
1
2
2
1C10
2.2µF
C7
100nF
C8
100nF
2
1
1
2C11
2.2µF
C9
100nF
+10V
R8 1kΩ
R2 1kΩ
R12
2.2Ω
R11
180Ω
R9
47kΩ
R10
2.2Ω
R4
2.2Ω
21
3
3
1
2
3
1
2
21
3
Q6
2N2907
Q5
2N2907
Q1
2N2222
Q4
2N2222
R5
2.2Ω
R7
180Ω
21
3
Q3
2N2907
3
1
2Q2
2N2222
R6
47kΩ
2
1C5
1µF
R3
2.2Ω
D1
1
2
2
1
C4
6.8nF
NPO
3
2
1
TR1
R1
1MΩ
4
6
12
C1 1mF MKT
12
C19 1mF MKT
E
3
P
1N
2
P1
1
2
3
P1A
P1C
P1B
MINI DIP
SW3
14
16
TR2
10
12 SW2
Mains
Switch
Phase
Neutral
UI30x10.5
1
3
5
7
1
2
3
4
110V
220V
110V
D3
D4
D5
D6
4 x 1N4004
1
22
1C16
1000µF
25V
C22
100nF
2
31OUT IN
GND
IC5 LM7810
1
22
1C13
10µF
16V
C12
100nF
2
31OUT IN
GND
IC3 LM7805 +10V
1
22
1C15
10µF
16V
C14
100nF
+5V
AN488-26.EPS
PHONE REMOTE SYSTEM APPLICATION NOTE
15/16
Information furnishedis believed to be accurateand reliable. However, SGS-THOMSON Microelectronicsassumes no responsibility
for the consequences of use of such information nor for any infringement of patents or otherrights of third parties which may result
from its use. No licence is granted byimplication or otherwise underany patent or patentrights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1995 SGS-THOMSON Microelectronics- All RightsReserved
Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips
I2C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to
the I2C Standard Specifications as defined by Philips.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - China - France - Germany- Hong Kong - Italy - Japan- Korea - Malaysia -Malta - Morocco
The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom -U.S.A.
1
2
5
6
7
8
9
10
16
17
18
13
14
15
11
12
VSS
TOE
IC6
LC7386
C24 100nF
12
B4
B3
B2
B1
B0
R22
560Ω
LD4
LED VERTE
+5V
1
2
C25
100nF
ST/GT
EST
STD
Q1
Q2
Q3
Q4
VDD
4
3
VREF
IN+
IN-
GS
OSC1
OSC2
B/H
PD
R25 300kΩ
R21 100kΩ
R20 100kΩ
2
1
XT2
3.57945MHz
C2 6
100nF
12
+5V B7
+5V
2
1
3
Q7
BC547
R23
2.2kΩ
1
2
C27
100nF
R24 4.7kΩ
R19
300Ω
D8
ZEN.4.7V
D9
ZEN.4. 7V
1
1
2
2
2
13
4
TR3
Transfo.
CECLA
R181.5kΩ
1W
C232.2mF
250V
12
R17470Ω
3W
21
G1
GEMOV
2
3
1
W2
P2A
K1
+5V
A2
32
1
Q8
BC547
R26
220Ω
LD3
LED JAUNE
D7
1N4148
R27 4.7kΩ
1
2
P2B
P2C
P2D D2
RelayDPDT
D1 0
ZEN. 15V
1212
D11
ZEN. 15V
R28 10kΩ
C28 470nF
250V
12
1
24
5
IC8
4N36
R29
100kΩ
+5V
A3
5
2
3
4
PHONE
LINE
AN488-27.EPS
PHONE REMOTE SYSTEM APPLICATION NOTE
16/16
