ST3854 ,V(dd-max): 6V; 150mA; 0.7W; electronic hook switch deviceour,
SGS-THOMSON
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ST3854
ELECTRONIC HOOK SWITCH DEVICE
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ST3854
V(dd-max): 6V; 150mA; 0.7W; electronic hook switch device
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ST3854
ELECTRONIC HOOK SWITCH DEVICE
I TIP AND RING SWITCHES FOR TERMINAL
CONNECTED TO ATELEPHONE LINE
I HANDSFREE / ON HOOK DIALING KEY
CONTROL
I HANDSET SWITCH CONTROL
I RINGER INTERFACE AND RECTIFIER RIN-
GER BRIDGE
I PULSE DIALING INTERFACE
I AUTOMATIC LINE SEIZURE THROUGH Ml-
CROCONTROLLER CONTROL
I LINE INHIBITION THROUGH MICROCON-
TROLLER CONTROL
I FRENCH DC LINE CURRENT REGULATION :
- OFF - HOOK MODE (60mA Max.)
- PULSE DIALING (75mA Max.)
I FRENCH INCOMING CALL CURRENT
CONTROL
I IN DC CURRENT REGULATION MODE,
VOLTAGE INFORMATION FOR THE SPEECH
CIRCUIT FOR TX AND Rx GAIN CONTROL
I POWER DISSIPATION LIMITATION FOR
OVER-VOLTAGE SURGES
I LINE CURRENT PRESENCE INFORMATION
I LOW VOLTAGE SWITCHES REQUESTED
FOR EHKS KEY AND HKS SWITCH
DESCRIPTION
The Electronic Hook Switch device integrates the
high voltage stage, which is directly connected on
a telephone line, of a terminal like, corded tele-
phone set with handsfree or On Hook Dialing,
cordless phone, answering machine or fax.
It integratesall the different DC line French regula-
tions.
The high voltage switches, N-channel/D-Mos and
P-channel/Drain extension Mos, are integrated in
a mixed 250 Volts technology.
The ringer interface allows to use a common
ground between speech, dialing and ringing fea-
tures.
October 1996
The possible use of low voltage switches, 5 volts,
for HKS switch and EHKS key, allows reliable
functionality in critical environment condition like
humidity atmosphere saturation.
The Electronic Hook Switch device allows to make
a high voltage line interface for any terminal con-
nected on a telephone line with few discrete com-
ponents (Rectifier bridge, R/C ring network and
protections) and allows to passthe French require-
ments by added only two resistors and two capaci-
tors more.
(Plastic Micropackage)
ORDER CODE : ST3854
PIN CONNECTIONS
'I‘KLI: 1 L...., 28 CI INHL
IHKS E 2 27 C) MASK
IEHKS l: 3 26 C] IVEN
DP [l 4 25 C] N.C.
HKS I: 5 24 Cl Vm,
EHKS E 6 23 Ci V+
v. E 7 22 C] ILSENSE
VRING l: 8 21 C) ISW3
VSUBS E 9 20 j ACDEC
GND l: 10 19 C) TIMER
L2 l: 11 18 CI N.C.
NC. E 12 17 C] CURD
s I: 13 16 CI VE
WR E 14 15 , VLREG
D 'Hi%l37 00751633 653 III
3854-01EPS
ST3854
PIN LIST
Pin tf Symbol Function
1 TKL Input logic signal to "take the line" in Electronic hook switch mode or torcordless and answering
machine.
TKL = "I"; line closed
TKL = "0"; line released.
Note : In inhibit the line feature, this pin should be at level "I".
2 IHKS Open drain output logic signal following the status of mechanical hook-switch , Pin 5.
3 IEHKS Open drain output logic signal following the status of EHKS key , Pin 6.
4 DP Input logic signal for pulse dialing and flash modes,
DP ="1''iline closed.
DP = "O'' ; line is open and timer and overvoltage protection circuits are resetted.
5 HKS Mechanical hook switch input
6 EHK Key input for electronic hook switch feature
7 V- Connected tothe negative polarity of the external rectifierbridge
8 VRING Ring frequency information for frequency analysis and Inhibit the line feature
9 VSUBS Substrat
10 GND Ground, negative common reference point
11 L2 Output connection with the line L2 terminal
12 NC. This pin should be left open, (internally connected)
13 s Output connection to the ring R/C network
14 Vm Positiveringersupplyvoltage
15 VLREG To external 1k resistor for line current regulation purpose (French characteristic.)
16 Vs Positive power supply for speech circuit
17 CURD To external AC decoupling capacitor for AC shunt in DC current regulation mode
18 N.C.
19 TIMER To external capacitor, for current limiting duration during Off-Hook transient with AC ring signal.
(French requirement). This capacitor is also used for AC shunt in DC current regulation mode.
20 ACDEC To external AC decoupling capacitor for AC shunt in DC current regulation mode
21 ISW3 Current information flowing in SW3 switch to obtain AGC speech linearity during DC current
regulation
22 IL SENSE Resistor threshold to overvoltage protection circuit
23 V+ Positive path of external rectifier bridge
24 V00 Internal logic positive supply
26 IVEN Line current presence information output logic
27 MASK Input logic for DC current regulation control in pulse dialing mode.
MASK=''1", IL Max. < 55mA
MASK= T'', IL Max. < 75mA
28 INHL Inhibition of any line connection command through HKS and EHKS pins.
Note:lninhibitthelinefeature,theTKLPinshouldalsobeatltsvel"1".
Gr, sas-nmmsou
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El 'HiHiil37 007983” 7LT El
3854-01.TBL
