M5232L MITSUBISHI | Alldatasheet
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MITSUBISHI <LINEAR ICs> M5232L,FP VOLTAGE DETECTOR/ON-OFF ALARM CIRCUIT DESCRIPTION ____ [PIN CONFIGURATION (TOP VIEW) The M5232 is a unique semiconductor integrated circuit designed for use as a voltage detector/on-off alarm circuit. bay. Housed in a compact 8-pin SIP, the M5232L contains a oe comparator, reference voltage source, a vibrator circuit for a yorraas getmins turning the LED on and off, and a voltage regulation circuit. 4 [8] Logic ouTeut When the input voltage of the comparator at Pin @ is higher S Beer c, than the internal reference voltage, the LEO lights up, and $ [ajeno when it is lower, the LED turns on and off. Also provided is ' LED BLINK DRIVE an output pin (Pin ©)) which does not operate intermittentlyk 17] Vier CHECK but permits a relay or micro buzzer to be driven while the VOLTAGE REGULATOR LED is being turned on and off by Pin @). Signals trom a low output voltage checker for batteries, or from optical or thermal sen- Outline 8P5 sors are detected at the input pin of the comparator (Pin @) aeeutton [7] 13] Vee allowing the M5232L to be applied widely in the alarm and Veer CHECK YOuTAGE protection circuits of electronic equipment. ; LED BRINK DRIVE faqnistvtow., FEATURES one BIEAPACOR cy @ Starting supply voltage at which the LEO will blink can be Outline 8P2S set optionally by using external resistors Ri and Re (in the case of a low voltage checker for batteries) © LED on/off frequency can be set optionally with external capacitor C) APPLICATION © Buily-in logic output pin (Pin ©) causes a high-to-low Low voltage checker for batteries in equipment level transition as soon as the blinking begins such as radio/cassette recorders, portable VCRs, © Hysteresis operation is possible at the blink starting cameras. Alarm and protection circuits of electronic voltage using Pin ©) equipment. © LED lights when the input voltage of the comparator at Pin Dis higher than the internal reference voltage, permitting © RECOMMENDED OPERATING the M5232L to be used as a pilot lamp for power ON CONDITION indication Supply voltage range «-:*+-0-Veo=5~18V BLOCK DIAGRAM a - - 1 Vee @) (1) Reautator i VOLTAGE OUTPUT | 8 REGULATOR itt a a << (2) Viet CHECK COMPARATOR Vret (3) LED BLINK DRIVE No REFEREN, i er boIRCUIT No Loic OuTPUT , ee |
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MITSUBISHI <LINEAR ICs> M5232L,FP VOLTAGE DETECTOR/ON-OFF ALARM CIRCUIT ABSOLUTE MAXIMUM RATINGS (1a=25, unless otherwise noted) ["Symbor [Parameter Gonaitiong Ratings Tun | [Pa | Powerdissipation P8004) 74400) [in [toadeuront me | [Ke [Thermal erating ass [Toor [Operating temperature range | 20 5 [Taig [Storage temperature range 85 HS ELECTRICAL CHARACTERISTICS (Ta=25'c) Parameter Test conditions conn | Min [tye | Max | [icc _[eweutewnent SSSC~di emma | 8. [ma | [ve [Reterence votage | VeomOvmuymaog | ae Pi [ao Tv | [vou votase Sd Veco. eaoe || AO] a | | Vec=3V. Fus=4000 [pertos tv | [ve [Saturation votage | Veo OVRue=tooa | Te | os |v | [1 Toseiiation requeney [Veo 6.4 7nF Ryda |e TT he | TEST CIRCUIT Ss Pa M5232L. @ Ra ° an ©) SA | ‘ Re © QO PIN (@ WAVEFORM f=1/T (Hz) [Parameter [vec] Ss [ s [ss [ss ] ee [cc | av _[orr [orr [ore | — | |v. [sv [on | on or] b |} [vi [sv Ton | on fore] a | |v. [sv Ton [on [ore |< | 5 [ve [ev Ton Torr | on | a | (Duty oycle 1 approx. 5096) Lr ev Ton Ton Tore] | ° MITSUBISHI 12 a MTSBS
MITSUBISHI <LINEAR ICs> M5232L,FP VOLTAGE DETECTOR/ON-OFF ALARM CIRCUIT EE eee 1. Basic principle of M5232L operation @ When supply voltage Vcc is normal, the LED lights LOW VOLTAGE CHECKER FOR BATTERIES and functions as a pilot lamp. In this case, Pin 3) (SIMPLIFIED DIAGRAM) drives the LED with open-collector output. ———— ®Vcc drops, becoming Vcci and when the Pin @ (8) {i 1 VOLTAGE ve Potential Becomes Voc] 75K27' | Comparator REGULATOR ! Vir acta * Voor <Vret ) > [_] S @ the comparator inverts, the blink curcuit is switched 18k BUNK ‘on, and the LED blinks on and off. (Vref, produced by (6) Vret the internal reference voltage source, is 1.31V typ.) + (5) @ The on/off alarm circuit shown on the right will acti- —_ vate when the voltage is 6.8V, which is 25% less than -— Vec=9V (six 1.5V cells). @ Pin © is an open-collector output that causes a high- to-low level transition simulataneously with the Pin @) ‘on/off operation. A micro buzzer, relay or other load can be connected across this pin and Pin () of Voc (Pin ®) for a wide range of applications. ov ” wan for LED blinking Vecs Supply i VecON \\ Wy. Bettery replacement Ie Constant voltage until Vec Blinking |, is approximately equal to 5V ON current Continuous lighting flowing to LED HIGH(OFF) Pin ® voltage LOW(ON) 2. LED Drive current Ir 3. On/off oscillation frequency The on/off oscillation frequency can be varied by A changing the value of external capacitor Ci. nz | Var Ve 6 vs ~ 2 @ Assuming that Pin (1) output voltage is 4V, LED for- ward voltage is Ve, and V3 is 0.2V, then ° 4V—0.2V—Ve o 2 4 6 8 10 = cy (nF) Ip is approximately equal to 4.6mA with Vp=2V, and * If capacitance C, is even further reduced oscillation will R)=3900 (in a typical application circuit) be possible up to a frequency of about 10 KHz a MITSUBISHI wees 1-13
MITSUBISHI <LINEAR ICs> MS232L,FP VOLTAGE DETECTOR/ON-OFF ALARM CIRCUIT TYPICAL CHARACTERISTICS POWER DISSIPATION VS. OUTPUT VOLTAGE. REFERENCE AMBIENT TEMPERATURE VOLTAGE VS. SUPPLY VOLTAGE 1000 5 > Ta=25C Fab | | | og [tT rf NIL} fpf tt 3 600 ae 3 h pepe N |] ait! | tf pot J NS) 8B Le £ 2 S Sr a a PLIES *& PT] 0 oO 0 25 50 i) 100 125 0 5 10 18 20 AMBIENT TEMPERATURE Ta (‘C) SUPPLY VOLTAGE Vee (V) OUTPUT VOLTAGE VS. LOAD CURRENT SATURATION VOLTAGE VS. LOAD CURRENT a er ~* Ta=25e Voe=9V 2 Vec=9V LH $3 5 < 2 1.0 A
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LOAD CURRENT |, (mA) LOAD CURRENT |, (mA) PRINTED CIRCUIT BOARD FOR CIRCUIT TESTING (TYPICAL APPLICATION EXAMPLE) PRINTED CIRCUIT BOARD WIRING DIAGRAM (PARTS SIDE) (COPPER FOIL SIDE) ° ° ° ° aa ° ° GND Ry + 1 8 ) M5232U 5300 Ces poser J : Veo ° 6 ° MITSUBISHI 14 a iaes
MITSUBISHI <LINEAR ICs> M5232L,FP VOLTAGE DETECTOR/ON-OFF ALARM CIRCUIT APPLICATION EXAMPLES 1. Low voltage checker for batteries Vee(9V), : - . av ®) © 4) Pe I alr | i Soa This low voltage checker for batteries is set to start the SKF GON <a @) LED blinking when supply voltage Vcc = 9V (six 1.5V ! —f VOLTAGE| | @teD cells) is reduced by 25% (to 6.8V) Sine | La REGULATOR 4 C1=4.7 a Ff 51.8H2 Veet Q) C2, which has a value of 100pF, prevents oscillation. It @) [| 1 should be inserted when the input/output leads are long : [lesweel ‘or when parasitic oscillation is generated by the load. Arne 7 6) len pi cil generated by et ® L be T oy REFERENCE VOLTAGE GENERATOR 2. Trouble indicator v When the base of transistor Tr is set low (the normal oo @) @ condition), Pin @ comparator voltage is set high, Pin @ Ry M5232 Ra is set low, and the LED is switched off, 3909 \\ ivi @ @ When the base of transistor Tr: is set high (signifying ® G) trouble), Pin D comparator input voltage is set low, the Input. te co @re0 internal vibrator circuit is switched on, Pin @ is repe- Hu? n © ow ire y atedly set high and low, and the LED blinks on and off. Ly At the same time, an electronic buzzer can be sounded using Pin © or a relay can be driven. (An ordinary switch may be used in place of transistor Tr.) 3. Abnormal temperature indicator ® | © R Vee . cL Of ne ms232L_ | (2) 3909 in normal circumstances, the LED is off and power dis- T @ | B,D ree sipation is kept low. In abnormal circumstances, the ' tr LED blinks on and off. It is also possible fo sound a buz- =r i] fatn . zer or drive a relay using Pin ©). J menuisron 8) @Or# tr m tx BUZZER 4. Timer and muting indicator ® @ a By connecting Cz in parallel with Rx, Vcc is switched on, Veo} Ri [| s230. the charging current indicated by the dotted line in the = @ | © @reo figure tlows, and the LED blinks on and off until the Pin
7 FEO ® @ voltage reaches
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— ot 1 Veo * he = I ota” co" RHR, T When C> is charged up, the LED will light. These op- ‘ erations can be applied to timer and muting circuits. MITSUBISHI ees 1-15
MITSUBISHI <LINEAR ICs> MS232L,FP VOLTAGE DETECTOR/ON-OFF ALARM CIRCUIT Eee Eee eee 5. Low voltage checker for batteries (of 5V or less) © @ As Since output Pin @ of the M5232L is regulated at 4V, Vee] ry . the output is not stabilized at Vcc less than SV. = O-| 2 }—@ Peo When an LED is connected directly from Voc as 1 ® O shown in the figure at lett, it is possible to construct a
1 Re ° battery checker for batteries of less than Vcc 5V, (for
= © © ty tn instance, Vcc =3~5V). Note that in this case, the Ir of ae the LED will fluctuate in accordance with the changes in Vee 6. Hysteresis operation of the on/off starting voltage 3 @ a By connecting Ry, across pins © and @, as shown in the Vee] ag. 3909 figure on the left, the on/off starting voltage is set at Lom @ ms232L Q® +R, = @uev Veron «Bite = © Ot aret) *R | Rez Sq co After the start of the on/off blinking, Pin © (the open = on 474 collector) goes on, and so it is possible to apply hys- + | © " teresis and the voltage expressed below: y Veron « Pit Rell ‘airet) Ro/Rn 7, Modification of output voltage V output VOLTAGE vs 15k ] rR, The output voltage Vi of the M5232L is set by the inter- Voom @ M5232. @ 1 nal resistor as shown in the figure at left, but this can be 7 7.6 | oi “© changed by connecting a semi-fized resistor across og i c GND and pins @ and ©). =" 44 a tL © OF 8. Increased current capacity of constant-voltage er suppl Pows pply CONSTANT-VOLTAGE Tn POWER SUPPLY R The current capacity of the built-in constant-voltage (8) LeD| power supply is approximately 20mA. However, by a a 1482320 4 ® @ |+ attaching external transistor Tr as shown in the figure = + 7, on the left, it is possible to obtain a constant-voltage = at @ @ power supply with a large current capacity of 1A or i ps & 44 In more. The output voltage of the power supply can also i © Oh" | be varied with variable resistor Vr a tr ott Note Oscillation may be generated when the input or output leads are long In cases like this, input and output capacitors C; and Ce (1~ 10uF) should be inserted near the IC MITSUBISHI 116 ae ELECTRIC