SCL5458

SCL5458 ALLEGRO

Document overview

• Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 6

Technical content

Bean anit nine diaateslirrain chub NE SEES cls Noctua es tint he ee - ne ee ee ee REE | , ALLEGRO MICROSYSTEMS INC 33E D M@™@ 0504338 0005654 3 MBALGR Bt one oe = cn ee 5 DJ 33/38. ac. Bguemioners: aah SAA ORTON Peg tana Tae ea Senet yay br pie: AR F fe RS St on, es gatas emia We Ug tenet ea oe 53 Z A DY ay A. Eats ae ee ee te OLN POP hi On OE, CF AINE Re . 2-FUNCTION, 4-DIGIT : These devices are 2-function digital automotive clock circuits. . . SCL5604E fabricated on a single monolithic chip using CMOS technology. They feature low cost, low power, and high reliability. The six devices in this series offer a variety of display and setting options and provide all of the eG) pel wr functions normally desired in a 4-digit automotive clock. ~ oo) a) ww oo ww All versions provide a push-button "time tone” setting that will zero. the minutes and seconds counters if the displayed time is within two vowrex (a nL" minutes of the hour, This feature allows the user to instantly set the w GS a] clock according to the time tone commonly provided on radio'stations. “@ ee” The display driver outputs will directly drive standard vacuum eG) yl? fluorescent displays. A dimmer input controls the display intensity by . afl Bi] @ varying the pulse width rather than by lowering the output voltage. This » O) (33) 0 technique results in a more uniform display Intensity. The rise and fall * rest (OH eo times of the output drivers are optimized to reduce RF interferénce. coon (Tt) ple All devices are supplied in a 40-pin dual in-line plastic package.with : om Bie 0.600" (15.24 mm) row centers and are rated for continuous operation over the automotive temperature range of -40°C to +85°C. Other se (0 coed packages are available on special order. - ~ » Od GF) « «Gi roy FEATURES : . “Gl en @ Push-Button "Time Tone” Setting “G gl ewer @ Variable Pulse-Width Display Dimming osc our (ia) [23] Lose oxo @ 12- or 24-Hour Timekeeping Option ° ose. w {T9) 123) crow @ Rollover Protection on Minutes Set . oun GA By ms @ High Noise Immunity a poly Diode Protection on all Inputs ore eseovaeT a @ RFV/EMI Minimized 7 we PC-002 . . ABSOLUTE MAXIMUM RATINGS > Total Supply Current, Ing «= +... ++. 20mA Input Voltage Range (Ref. V<), Vaiss seeeees 10,5 V0 Voy +0.5 V Input Current, hy... see eee eee. E10MA Package Power Dissipation, P ... 300 mW Operating Temperature Range, Tyeccceeserseveeees 240°C to 485°C Storage Temperature Range, Tg icc ceececeeeee es 65°C to +150°C Caution: These CMOS devices have static pro- tection but are susceptible to damage if exposed to extremely high static electrical charges. Always order by complete part number, o.g. [SCL5233E] . “ 6-30

ALLEGRO MICROSYSTEMS INC. 33E D MM 0504338 QOOS5655 5 MHALGR 5253/3805 458/63/ 749 560A Ie oe SS oe

2 EON CLONE DICIE VA ULOMOTIVE CLOCKS) oo ce ;

Do ee ee eT. Oya TYPICAL INPUT CIRCUITRY TYPICAL APPLICATION . *12V : “oo 184304 Matz : POS ye SNM ag = 8 aaa H Yoo Our oN (Pr

1 Q Ka peanqeeneteseasavensnsnael

. aye ene ba line an BBG EU rece —~ on Ovs5 © Soars s2 PWM] ow DEPENDING ON INPUT 0° s1 ‘Dwg. EP.010-8 13a : id - ‘wg. EC-003 ELECTRICAL CHARACTERISTICS at TY = -40°C to +85°C, Ves 2 OV, in Typical Application (unless otherwise noted). . Pe ee | Suaeatdwn vos [Vagos | ar 50 T= 95 [| Vv] [ Seaman ove Gorent [tr [Yop 80 Yn S8V | a a |_tnpstResstance TR StS2erseeny dT oo dC a A NOTE: Negative current is defined as coming out of (sourcing) the specified device terminal. 6-31

ALLEGRO MICROSYSTEMS INC’ 33€ D MM 0504334 OOOS&SE 7 MMALGR Me 5235/38 5158/03/71 00. ee Baan Te Dement i Be er Ne en eee FUNCTIONAL DESCRIPTION ane = . Voo The positive supply. oan : Veg The clock logic reference; ; current limiting is normally TRANSIENT. required. CURRENT LIMITING - GROUND Power ground. weV y ; = ‘00. 12/24H switch or hard wiring here Sal teehee ° aan tee ee ae controls the clock timebase: =; ad : Open = 24h, Low (V,,) =12h. H . ' This function is not available : i in the SCL5604E and that 1 | ctock y bisptay | ! device operates in the 12-hour | Toate Zz Vze Drivers | | mode only. | @svy (16.5 V) ' st Pulling S1 Low (V,,) incre- : : 4 ments the hours as shown H H in the table. H 2 3 ' $2 Pulling $2 Low (V,,) incre- Ss GROUND, ments the minutes as shown 13k2 : in the table. TYPICAL $3 Momentary switch for time tone, to start clock, and 2 display command. This = . switch is required for the : AS238EA, optional forall 2 pw. eee other devices. Clock . Version ‘$2 (Set Minutes) SCL5233E ‘one increment ‘one increment optional ... steady per depression per depression, time tone and start clock display command* . SCL5238E ‘one increment ‘one increment time tone, steady per depression per depression display command’, start clock : SCLS5458E ‘one increment ‘one increment optional .., ‘one second per depression per depression, time tone and flashing start clock display command* SCL5463E ‘one increment ‘one increment per optional .., one second per second while second while time tone and “| flashing _ depressed depressed, start clock display command* SCLS474E two increments two increments per optional ... steady SCLS5604E per second while second while time tone and - depressed depressed, start clock display command* trees i * S00 IGNITION ‘ . A 6-32 a ~

ALLEGRO MICROSYSTEMS INC’ 33£ D MM 0504338 Q00Sb5? 4 MMALGR : TINCT SE UIEL PEOMG LIVE CLOCKS ® pare a ; SS NCO it cee Pe ee hae eee sa ee es BINS Er ee GRC KEE. ON FCO TGA AAT RON Ns Ree Ng Seem RE RRR TE NP TE Odgal For all devices except the SCL5238E; the first depression of S2 . stops the clock and resets the seconds. Simultaneous depressions of ‘S1 and S2 reset the clock to the 1:00:00 state; the clock restarts when S2 is released. With the SCL5238E, after the first depression of S2, if more than four seconds elapse between S1.or $2 depressions, the entire display flashes at a one-second rate to indicate that the clock has been reset. Simultaneous depressions of Si and S2 reset the clock to the 1:00:00 state; the clock restarts when S3 is operated. If the clock is running and the time is within two minutes after the hour, depressing S3 causes seconds and minutes to reset, and the hour to remain the same. If the time is within two. minutes before the hour, depressing S3 causes seconds and minutes to reset and the hour . to increment by one. The clock resumes operation in the real time mode when S$ is released. Any operation outside the £2 minute window will not affect the clock. LAMP Controls display brightness in conjunction with . IGNITION. IGNITION Controls display brightness in conjunction with LAMP. | IGNITION LAMP Input Input 12 V (ON) Ground (OFF) 12V ‘50% brightnesst, 100% brightness, (ON) dimmer enabled, dimmer disabled, S1, $2, $3 enabled $1, $2, $3 enabled Ground 50% brightnesst, display OFF, (OFF) display command enabled, _ display command enabled dimmer enabled 7 + 25% for SCLS604E t With IGNITION at ground (OFF), a depression. of $3 will turn ON the display for 4 +1 seconds at 100% brightness. The time tone function is disabled when the IGNITION input is ground. FILAMENT The enable output for the VF display filament. If S3 is . omitted, the discrete transistor can also be omitted if the display filament is connected directly to the 12 V supply through the accessory switch. SEGMENTS The output drives for the VF display segments, at a2 “ag ad bi 2 bs Ls) 4 bs . 0 Oee Oro C2) Os. 0 - COLON a ca a3 a wg.00-001-1 LE 6-33

ALLEGRO MICROSYSTEMS INC 33E D MM 0504334 OU05bSa O MmiALGR ‘B233/3895458/63/7 18500 ee cer eR Se .. Ree ee eee De Cnr! peewee si COLON The output drive for the VF cisplay colon. For the SCL5233E, SCL5238E, SCL5474E, and SCL5604E . the colon is steady; for the SCL5458E and SCL5463E the colon is in a one-second flashirig mode, * DIMMER —_A voltage input to control the display brightness. This can be from a fixed (R,) or light-dependent resistor divider, or a linear voltage control signal, . PWM ‘An RC network for controlling the display duty cycle (dimming). Yoo ‘SEGMENT OUTPUT DRIVE DIMMER PWM | | = Vpo-} ° ® ° Voim

512 Hz PWM VOLTAGE

ig. Wo-02 : Ry Or ——-Vp/Vop | Per Cent Duty Cycle (at T, = +25°C) RC = 0.9 ms RC =4.72ms S70KQ 035 1 0 245 kQ 0.45 10 ) 165 ka 0.55 20 0 108 k2 0.65 29 4: 67k 0.75 36 a : - 35kQ 0.85 42 93 10.5 ka 0.95 48 ae) oy IN & OUT These are the oscillator connections for the external crystal and frequency adjustment. TEST This is a test point for adjustment of the crystal oscillator frequency. When properly aligned, the: - output at this terminal is a 128 Hz square-wave signal. : EN 6-34

ALLEGRO MICROSYSTEMS INC 33E D. MM O504338 OO0SGS4 2 MMALGR

92331385 SADSIGS ASD OOF pee secs on ee

2° RUNG LION; 4:DIGEE-VE AUTOMOTIVE: CLOCKS#s 5 Be IAS is tn aT see ace os aes tate oo Tak en ao oe ee ih Raab NSPE SNe at nates lea gLEy CLR Anne eRe RS na . Teg ww et 7-4 9-75-02 la Yop O 5-40 pF 30 pF 7 . i IN 15 TEST our 7 gs O Oo ; Dua, E6-008 PIN DESIGNATIONS ‘ 1 $2 s2 21 PWM PWM. 2 st LAMP 22 GROUND DIMMER 3 $3 adeg1 23 Ves OSC. IN

4 IGNITION 12/24 24 FILAMENT OSC, OUT

5 NU ol 25 Voo b4

10 TEST g3 30 3 ix}

W COLON e3 3 e3 COLON. 12 3 3 32 93 TEST 13 ad3 g4 33 2 b2 ‘ 14 bs e4 34 d2 a2 : 15 4 d4 35 e2 2 16 ad o4 36 92 bt . 17 ba Voo 37 ct NU 18 OSC. OUT FILAMENT 38 NU . IGNITION 19 OSC. IN Ves 39 NU $3 .

20 DIMMER GROUND 40 LAMP st

NU = Internal connection, do not use. . ee 6-35,