ST3854

ST3854 STMICROELECTRONICS | Alldatasheet

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ee SSSSSSSSSSSSSSSSeSSSSSSSSSSSSSSSSseee STA 1] SGS-THOMSON fo MICROELECTRONICS ST3854 a SSSSSSSSsSssSSssssss ELECTRONIC HOOK SWITCH DEVICE a = TIP AND RING SWITCHES FOR TERMINAL The possible use of low voltage switches, 5 volts, CONNECTED TO A TELEPHONE LINE for HKS switch and EHKS key, allows reliable = HANDSFREE / ON HOOK DIALING KEY functionality in critical environment condition like CONTROL humidity atmosphere saturation. = HANDSET SWITCH CONTROL The Electronic Hook Switch device allows to make = RINGER INTERFACE AND RECTIFIER RIN- a high voltage line interface for any terminal con- GER BRIDGE nected on a telephone line with few discrete com- = PULSE DIALING INTERFACE ponents (Rectifier bridge, R/C ring network and = AUTOMATIC LINE SEIZURE THROUGH MI- protections) and allows to pass the French require- CROCONTROLLER CONTROL ments by added only two resistors and two capaci- ® LINE INHIBITION THROUGH MICROCON- : TROLLER CONTROL ™ FRENCH DC LINE CURRENT REGULATION: cai - OFF - HOOK MODE (60mA Max.) call L an - PULSE DIALING (75mA Max.) N _ <n "FRENCH INCOMING CALL CURRENT Ko ean CONTROL sa = IN DC CURRENT REGULATION MODE, so28 VOLTAGE INFORMATION FOR THE SPEECH (Plastic Micropackage) CIRCUIT FOR Tx AND Rx GAIN CONTROL = POWER DISSIPATION LIMITATION FOR ORDER CODE : ST3854 OVER-VOLTAGE SURGES = LINE CURRENT PRESENCE INFORMATION = LOW VOLTAGE SWITCHES REQUESTED PIN CONNECTIONS FOR EHKS KEY AND HKS SWITCH C7 TKL [Ji 28 |] INKL inks [ J 2 27 |_| Mask 1enKs [ | 3 26 |_| Iven pp [| J4 257] Nc. DESCRIPTION uKs [] 5 24] Vo The Electronic Hook Switch device integrates the EHKS [_] 6 23 [| v+ high voltage stage, which is directly connected on a telephone line, of a terminal like, corded tele- vO 22 [| sense phone set with handsfree or On Hook Dialing, vrinc [_] 8 21) isw3 cordless phone, answering machine or fax. vsuss [] 9 20] acvec Itintegrates all the different DC line French regula- tions. cnp [_] 10 19 TIMER The high voltage switches, N-channel/D-Mos and wtf is [J Nc. P-channel/Drain extension Mos, are integrated in ne. (2 177) curd a mixed 250 Volts technology. The ringer interface allows to use a common ss tof] ve e ground between speech, dialing and ringing fea- vir (} 14 1s [| virec 3 tures. Fa October 1996 110 eee mm 7929237? 0079833 663

[Pinn? | sympor [Function id 1 TKL Input logic signal to "take the line” in Electronic hook switch mode or for cordless and answering |x. TKL ="0"; line released. Note : In inhibit the line feature, this pin should be at level "1". [2 [TKS [Open san output ol signal folowing the status of mecharicalhookawich, Pa. [| TEHKS | Open cran ouput ogi signal folowing the status of EHKS ey Pin, Se Ee Earnie mooie DP ="1”"; line closed. DP = "0"; line is open and timer and overvoltage protection circuits are resetted. [5 _| Ks [Mechanical hook switch [6 | EHK | Key nputiorelecronic hook swichfeature [8 | VRING [Ring frequency information frequency analysis and inthe Ine Teale [2 | veuss [Sweet | 10 | Gno | Groun negave common referercepont [11 [12 [Output connection withthe ine L2 terminal [13] 8 [ouput comectonto tering RIG network [14 | Vin | Postve singer suppyvolage | 15_| VinEG [To exemal 1k resstor for ine carent regulon purpose (French charaderaie) Positive power supply for speech circuit A TIMER To external capacitor, for current limiting duration during Off-Hook transient with AC ring signal. [> | | aa es A |_20 | ACDEC | To extemal AC decoupling capacitor for AC shuntin DC current regulation mode | | |_| Sattsnomate won SW even an AGE psc nary era BE ore regulation | 23 | V+ [Positive path of extemalrectifierbidge | 24 | Voo [intemaltogic positvesupply a a MASK="1”, I Max. < 55mA MASK= "0, I Max. < 75MA z NHL Inhibition of any line connection command through HKS and EHKS pins. 3 [| [ROMS RNA a Scams LY 2/10 . SE SS 8S $$ M@® 7929237 0079834 717

eK) BLOCK DIAGRAM | = ISW3_ | CURD | ACDEC LPO es I eer] be 26} nt | cee (ees i feet} -— ge L8H nererrace INTERFACE [+] Sa LJ ——a oe ||| 24} | poe oad |S) whee Healy To a P {s} F VRING 3 ABSOLUTE MAXIMUM RATINGS [-Symber | Parameter value | Unit | Peak voltage between Pins 23 & 7 250 Peak voltage between Pins 16 & 9 po Peak voltage between Pins 148 9 Peak voliage between Pins 24 & 9 [oe | temax | Currentin Speech mode |__Pmex [Maximum Power SSC Operating Temperature -25, +55 | Storage Temperature [5.15008 Junction Temperature -25, 125 L cc |% THERMAL RESISTANCE Symbol [Parameter «| SSValue ——_—«: Unit ‘JE Thermal Resistance Junction- Ambient Wax [00 ow 1} 310 TT 250 Sg08N __"" mM 7929237 0079835 bSb

ELECTRICAL CHARACTERISTICS (Tam = 25°C, Von = 3V if not otherwise specified) [Srmboi[ Parameter“ Tet Conditions [ win. | Typ. [wax [Unt] Minimum Operating Current Test = Sma cr tsatelv RSWI1/2 | Ron of Switches SW1 & SW2 Test 1,1=20mA | | 35 [ 45 | a | RSWis | Ron of Switch SW3 Test 1, Vin = 54V |_| 220 | 350 | 2 | RSWI5 | Ron of Switch SW5 Test 3, Vvs=tbv | 560 | 700 | a Vs = 20V 460 | 600 | Q Vs = 30V 430 | 550 | leak | Leakage Current (on-hook) Test 1, Vink sav] 1] 5 | yA Vue = 104V 45 | 10 | pA Vue = 250V 2 | 15 | pa IBIAS _| Current Consumption (off-hook) __| Test 1, I= 20mA | | 05 | 07 | ma | Bias Current on Voo Test 1, h = 20mA, Vop = 3V |_| 270 | 400 | ua | Voo Suppiy() Aer speed up mode lem| [ss |v) VSUT | Voo Speed-up Threshold ‘Speed up OFF Vv Speed up ON Vv Line Regulation Current Test 1, Visn2 = 54V, Ri = 3000 [| 45 | 55 | ma | | tsranr [Startup LineCurent | Test. Vima=SeV |_| «110 | 150 | ma | Line Current in mask mode & in Test 2, Vine = 54V 75 mA pulse make period Line Current in mask mode & in Test 2, Viin2 = 104V HA pulse break period SW3 Switch Current Ratio Test 1, Vina = 54V [| [2o00f | i Timer Pin Bias Current [TestiVine=sav to Ta | R between Pin 5 or Pin6 and Pin7 | Test 1, Vine = 54V to stay in On-Hook R between Pin 5 or Pin6 and Pin7 | Test 1, Vuin2 = 64V kQ to maintain Off-Hook | teens | Overvttage Threshold ACatt | AC Attenuation, 20 Log VUVe Test 1, Vac = 1.4Vams, f= 1kHz, Vine = 54V IL = Ines 0B IL = 20mA dB ACdist | AC Distortion Test 1, Vac =1.4Vams, f= 1kHz, Vie = 54V IL= Ines 1 | % i= 20mA 1 | % DP, MASK, INHL Input Voltage Test 1, Voo = 3V, High level = "1" [a4{ [| |v | Vino TKL Input Voltage Test 1, High level =”1" Remote command (master) (**) Vop v Remote command (slave), Vop = 3V Vv ITKLm | TKL Input Current Remote command (master), Voo = 5V | 200 HA ITKLs Remote command (slave), Voo= 3V__| 150 HA TKL, DP, MASK, INHL Input Voltage | Test 1, Voo = 3V, Low level = "0" [| fos tv, IHKS, IEHKS, IVEN Output voltage _| Test 1, Voo = 3V, High level = "1" [e7{ | |v g IHKS, IEHKS, IVEN Output voltage _| Test 1, Vo = 3V, High level = "0" [| [ [oas [Tv |g * The values of Voomin and VSUT (Speed up ON) are correlated. ** The command TKL is defined as "Master’, if the line is seized through this pin and as "Slave", is the line has been previously seized by EHKS key and use to maintain the line closed. 4/10 &r =] = ——— sss hI BETES ON me 7929237 0079836 Ste a

Switches - Input Pin MASK to control the line current during - SW1, SW2 and SWS3 isolate the speech and Pulse dialing and Flash signalization dialing part in On-Hook mode, these 3 switches _- Input INHL which forbids to close the line through i | i HKS switch and EHKS Key, if INHL and TKL Pins are open in On-Hook mode and are closed in § 8 mt This Off-Hook mode. These switches are closed if are simultaneously at logic level "1”. This feature HKS or EHKS input Pin is connected to V-, or if can be used in an answering machine. i in i i myn - The Vop supplies all the logic control, a speed up TKL input Pin is at logic level 1”. ! 2.9V atstart up and - In Off-Hook mode , the line current goes in the mode charges Vop capacitorto 2: ral wo switch SW1 since the current value reaches the each time that the Vop supply goes below 2.6V. threshold of the current detector connected be- tween CURD Pin and Ve Pin, when this threshold Timer : is reached, and the voltage across L1/L2 wires Atimer feature allows the line current to go upper increases the current increases progressively in 90mA and lower 150mA, at the start up, to realize the switch SW3 and the 1K resistor connected the incoming call detection requested by French between V+ Pin and VLREG Pin and decreases requirements. The time duration (Tstart) of this in the switch SW1. The current threshold is inter- upper current limitation is fixed by the capacitor, nally fixed at 47mA typical, if neccessary, this one Ctimer, connected on TIMER Pin. can be increased by connecting an external re- Tstart = 0.12 x 10° x Ctimer sistor between CURD Pin and Ve Pin. - SWS is closed in On-Hook mode to connect the Ringer Interface ring part, in Off-Hook mode this switch isopened Three diodes of the ringer bridge are integrated. In and the ringer partis disconnected. Inhibit the line mode, INHL and TKL Pins simulta- 7 : iti neously at logic level "1”, the switch SW5 is opened Figure 1 : SW1/SW3 Current Partition and the presence of a ringing signal can be de-

70 Tr tected on Pin VRING where the ring frequency is

«0 ass crew LETT TT | not ftered. so Greco TTT PTT overvottage Protection ; = 40 LEN TTT PT An overvoltage protection is integrated to open the t NGA line when the voltage across the line wires L1 & L2 = 30 ~ SN a is too high. The voltage threshold where the line is

20 LT Ae TTT open is fixed by the external resistor connected on

TUPI LETT ILSENSE Pin. The overvoltage protection circuit is 10 S ted if the DP pin goes to logic level ”0”. LPT TTT TIAN TT TT, BS vce Protons ¢ . : 5 1020.30.40 «50 6070 80 ; Figure 2 : Overvoltage Protection ith V, = 6V 200 U(L1/.2) (V) with V, = 6 eee Logic Control 150 LT att yyy The EHKS device is controlled by a microcontroller 3 SENSE through : wo oe 100 LT TXT TT - Output Pins IHKS and IEHKS which give the 3 CLOINEELEL LT status how the line has been taken. fej SS + - Output Pin IVEN which gives the status of the SS Lt] TP NEE TTT presence of a line current. > 50 LLELELLI Cre ~ Input Pin TKL to maintain the line closed when it CEEEEEEEeeeee has been previously taken through EHKS key 0 g - Input Pin DP to generate the Pulse dialing andthe 0 1 2 3 4 5 6 ; Flash signalization. Rasexse (kQ) a : 5/10 Ay Seen se @™ 7929237 0079837 429

Figure 3 : French DC Mask Figure 4: French Incoming Call (Off-Hook with AC ting signal and DC exchange supply) PEPE eS | 7° tf tf ff Af so-f ttt tty tt $00 EE ae === Se ee ae gece POSSE) See Sy or = go se Cees] Soo FE

2 FERRE Ep pe

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0 Pru tT Pe TT ee ee ee g | o RMS £

0 10 20 30 40 50 60 70 me 0 10 2 30 40 50 60 70 Viz (Y) Mean Voltage (V)(L1+ and L2+ Polarities) i Figure 5 : ISW3 Current Information es Fg ae [| Ty TTP rr er tte s-- EPP rrr ier eg OO 2 < ft TTT rp ype yt 6 7 = -CT TTT TTT Terr rrr | 2,7 TTT Trey TTT TTT Type et ,7- eae Perey o-LITrrrrrrr rrr) ¢ o 5 0 is 2 25 30 35 Vu (V) i Figure 6 : Vop Current Consumption Figure 7 : Vop Current Consumption often tren EEE] voftieetadTobwe FP py = EEEE REESE SA EERE a a 339 DLE 2° EET TT tt raA Too 2 a a | ~39+-,- PP Prete S30} PP tp yt tt ee A A A A Pe EEEERGAEEEEEE 78 EERE

0 PERE REE RRR 9 EEEEDREEEEE EE

pt Z| pOOLEECrrrrerrry, = ,,.QbbeYrtrrrrrri, 1 2 3 4 5 6 13 1 2 3 4 5 6 7% Veo (V) i Veo (V) i me 7929237 0079838 3b5 i

Figure 14 : Test 1 3.3nF A Wr i]s CURD ACDEC RING eecou NS i 1ka. vefig rs) 4,) hae -L_H15] vires fs) | <r 5] ve mE] 22uF | SaKs pp a | a ] e All | 1 Helens S73854 mask 27] A ve) | gg dy. vege] eek ra — a {19] TIMER tenks[3Ho hhsewse VSUBS GND ISW3 Va st | ° 7) | 300 3 at ov # Vi- Ve Vis ~ Ve IswitcH3 Rewie=7———, Rewis= > —,, leas = lune ~ Ispeec » Risws = SMTcHs, IsPEECH IswitcH3 'swsouT Im is measured in S4 switch. IneG and Istart are lline values which depend of the switch configuration. All the parameters are measured in both polarities (S3 in A & B positions) Revnve/tans / Woo Ver / Vi1/ Rewia/ Ines Risws / Voo/ Vsut [we |Openes_| Closed | Opened | Opened | Opened | Closed (7 ACatt / ACdist SE STS $$ mm 75929237 0079840 T13 a

28 PINS - PLASTIC MICROPACAKGE (SO)

L o b e = Ss 3 E branananananaan PS ° —— § DOUUUUUUUUUUUO i | Pimension | Milimeters [inches Cid [ Min, | Typ. Max. [Mins [Typ] Max. | [OAs te YO 1 a 1 [bros ose ooo SC*dCtit id a SC [oa tat oer orrits [eto ts 0.04 SC*d iat [ea ons [es test C~sSC“‘“‘C’. CVS CCS [Fae ot [oa te ots 000) [ss & (Max) i ESD - The SGS-THOMSON Internal Quality Standards seta large of 2kV that each pin of the device should withstand in a series of test based on the Human Body Model (MIL STD 883 Method 3015) : with C = 100pF, R = 15000 and performing 3 pulses for each pin versus Vcc and GND. Device characterizatiob showed that, in front of the SGS-THOMSON. Internaly Quality Standards, all pins of ST3854 withstand at least 750V. The above points are not expected to represent a Practical limit for the correct device utilization nor for its reliability in the field. Nonetheless they must be mentionned in connection with the applicability of the different SURE 6 requirements to ST3854. Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No licence is granted by implication or otherwise under any patent or patent rights 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, © 1996 SGS-THOMSON Microelectronics - All Rights Reserved ‘SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain- Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 10/10 = i hE SERS ON me 7929237 OO7984e 89b