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ha1835p/ha1848p watchdog timer ade-204-059 (z) rev. 0 dec. 2000 description the ha1835p and ha1848p is a monolithic voltage regulator control designed for microcomputer systems. in addition to the voltage regulator, it include watchdog timer function and power-on reset function. these ics can perform many function in various microcomputer systems with few external parts. features regulated power supply control function ? wide area of operational voltage; v cc = 6 v to 30 v ? available external pnp-type transistor, suited to any system power supply ? built-in overcurrent limiter for external pnp-type transistor ? output voltage can be adjusted exactry in the range from 4 v to 6 v watchdog timer ? internal bandpass filter control circuit (pulse width detect type) and reset signal oscillator ? fail-safe utility ? bandpass filter characteristics can be set by external resister (rf) and capacitance (cf) automatic reset ? automatic power-on reset ? pulse generator characteristics can be set by external resistor (r r ) and capacitance (c r ) ? alternative between res and res output
ha1835p/ha1848p 2 pin arrangement 1 2 3 4 5 6 7 res res cs v cc v cont comp * vadj 14 13 12 11 10 9 8 r r c r p-run rf cf vout gnd (top view) note: ha1848p: 9 pin is non connection. pin functions pin no. symbol functions 1r r reset pulse width depends on resistance connected to r r recommended range: 100 k w to 1 m w 2c r reset pulse width depends on capacitance connected to c r 3 p-run clock pulse input terminal for watchdog timer 4 rf frequency band width of filter circuit depends on resistance connected to rf recommended range: 100 k w to 500 k w 5 cf frequency band width of filter circuit depends on capacitance connected to cf 6 vout connect to external pnp transistor's collector: this pin supplies 5 v regulated voltage for internal circuit 7 gnd ground 8 vadj output voltage fine tuning terminal 9 comp phase compensation terminal: connect less than 100 pf capacitor between v cc and comp. ha1848p is non connection 10 v cont external pnp transistor's base control terminal 11 v cc supply voltage terminal: operating supply voltage range is 6 v to 30 v 12 cs connect current sense resistor, which protects the external pnp transistor, between v cc and cs 13 res * reset pulse output terminal for low level reset type microcomputer 14 res * reset pulse output terminal for high level reset type microcomputer note: res and res are open-collector output terminals, so connect a pull-up resistor of about 5 k w .
ha1835p/ha1848p 3 block diagram error amp c 1 v cc vout q v cc r cs cs 11 3 p-run 12 v cont 5 k w 10 vout ha1835p 6 9 comp * 14 res 8 vadj current limiter fail detector (band pass filter) reference voltage 2 k w rf 300 k w cf 0.01 m f 4 5 13 res power on reset detector reset signal oscillator r r 560 k w c r 0.1 m f 1 2 7 gnd note: ha1848p: 9 pin is non connection.
ha1835p/ha1848p 4 absolute maximum ratings (ta = 25?) item symbol rating unit supply voltage v cc 30 v p-run input voltage v p-run ?.3 to vout v output voltage v res 17.5 v v res 17.5 v output current i res 2ma i res 2ma control terminal voltage v cont v cc v control terminal current i cont 20 ma power dissipation (note) p t * 400 mw operating temperature range topr ?0 to +85 c storage temperature range tstg ?0 to +125 c soldering temperature tsol +260 (< 10 sec) c note: ta 77 c. if ta > 77 c, derate by 8.3 mw/ c.
ha1835p/ha1848p 5 electrical characteristics (v cc = 12 v, vout = 5 v, ta = 25?) item symbol min typ max unit test conditions power supply terminal current i cc 6.3 12 ma v cc = 17.5 v (no load), with pnp transistor regulator output voltage vout1 4.75 5.00 5.25 v v cc = 6 to 17.5 v, iout = 0.5 a section vout2 4.70 5.00 5.30 v v cc = 6 to 17.5 v, iout = 1 a line regulation d v oline ?0 +50 mv v cc = 6 to 17.5 v, iout = 1 a load regulation d v oload ?00 +100 mv iout = 10 ma to 0.5 a ripple rejection r rej 40 75 db e i = 0.5 vrms, f i = 1 khz limiter operating current i cs 1.0 2.0 a r sc = 0.2 w output voltage temperature coefficient d vout/ d t ?.6 mv/ c p-run input low-level input voltage v il 0.8 v section high-level input voltage v ih 2.0 v low-level input current i il ?20 ?0 m av il = 0 v high-level input current i ih 1.8 3.0 ma vout = 5 v, v ih = 5 v reset circuit section reset terminal low-level voltage v ol1 0.4 v i ol = 2 ma reset terminal i oh1 5.0 m av oh = 5 v leakage current i oh3 30 m av oh = 17.5 v reset time power on time t on 80 130 200 ms rf = 300 k w , r r = 560 k w , clock off reset time t off 60 130 220 ms cf = 0.01 m f, c r = 0.1 m f reset pulse low-level time t rl 40 80 160 ms reset pulse high-level time t rh 50 100 200 ms
ha1835p/ha1848p 6 test circuit 12 cs vout s 1 s 2 0.2 w 300 k w r sc 11 v cc ha1835p p-run 3 v cont 10 2sb857d v batt 4 rf 0.01 m f 5 cf 7 gnd 1 r r 0.1 m f c 2 100 m f 2 c r 560 k w 5 k w vadj 6 8 + - res 14 res 13 5 k w counter
ha1835p/ha1848p 7 functional description voltage regulator the ha1835p, and ha1848p supplies 5 v regulated output from a wide v cc input range (v cc = 6 v to 17.5 v). the external pnp transistor should be selected according to the supply current demand of the system. connect a more than 100 m f capacitor between vout and gnd to realize the 5 v regulated output. the resistor connected from the vadj terminal to the vout or gnd terminal fine tunes the output voltage. a resistor between vadj and the vout decreases the output voltage, and a resistor between vadj and gnd increases the output voltage. 5 vout - 7.14 5 - vout r (vout - vadj) ? (k w ) 7.14 vout - 5 r (vadj - gnd) ? (k w ) current limiter to protect the external transistor from overcurrent, connect a current-sense resistor between the cs terminal and the v cc terminal. the value of this resistor should be: 0.3 v iout (limit) r sc ? (at ta = 25 c) power-on reset the ha1835p, and ha1848p can output a reset pulse to start the microcomputer at power on (figure 6). the external resistor r r and capacitor c r determine the power-on reset timing. note that res and res are open-collector terminals. they should therefore be connected to a pull-up resistor of about 5 k w . watchdog timer the watchdog timer is a fail-safe function. it can reset the microcomputer system if the system runs out of control. it does this be monitoring a pulse output by the system's software. it uses a bandpass filter to determine whether the pulse frequency is within the system's normal frequency band (figure 7, 8). external resistor and capacitor rf and cf determine the frequency range of the bandpass filter. if the pulse frequency is not within the frequency band, the ha1835p, and ha1848p outputs a reset pulse.
ha1835p/ha1848p 8 application circuit example system burst reset output signal 3 hz power-on reset signal t on t off t rl t rh p-run res 0.2 w rf 300 k w r sc v cc v cc cs p-run 12 11 v cont 10 vout i/o port 6 q 2sb857d 4 rf cf 0.01 m f 5 cf 7 gnd 1 r r c r 0.1 m f 2 c r r r 560 k w 13 3 c 2 100 m f v reg v batt res res v cc microcomputer system 5 k w + - c 1 10 m f + -
ha1835p/ha1848p 9 characteristic curves 5 4 3 2 1 0 0510 input voltage v in (v) output current i out (a) figure 1 output voltage vs. input voltage figure 2 output voltage vs. output current output voltage v out (v) output voltage v out (v) output voltage v out (v) i out = 0.1 a 0.5 a 1.0 a ta = 25 c figure 3 output voltage vs. ambient temperature 6 4 2 0 012 0.2 w r = 0.5 w ta = 25 c 5.1 5.0 4.9 - 50 50 0 100 ambient temperature ta ( c) v in = 12 v i out = 1 a
ha1835p/ha1848p 10 resistor r r ( w ) resistor r r ( w ) power-on reset time t on (ms) 50 100 0 v in = 12 v ta = 25 c v in = 12 v ta = 25 c c r = 0.22 m f c r = 0.1 m f c r = 0.22 m f automatic reset pulse low time t rl (ms) 200 100 automatic reset pulse high time t rh (ms) 0 v in = 12 v ta = 25 c resistor r r ( w ) 1 m 50 k 100 k 200 100 0 200 k 500 k c r = 0.047 m f 1 m 50 k 100 k 200 k 500 k 1 m 50 k 100 k 200 k 500 k c r = 0.22 m f c r = 0.1 m f c r = 0.047 m f c r = 0.1 m f c r = 0.047 m f figure 4 automatic reset pulse high time vs. resistor figure 5 automatic reset pulse low time vs. resistor figure 6 power-on reset time vs. resistor
ha1835p/ha1848p 11 0 20 40 60 80 100 5 k 2 k 1 k 500 200 100 50 30 figure 7 clock pulse frequency vs. clock pulse duty cycle figure 8 clock pulse frequency vs. resistor duty = b a + b ab ta = 25 c v in = 12 v resistor rf ( w ) 20 k 10 k 5 k 2 k 1 k 500 200 100 50 20 100 k 200 k 500 k ta = 25 c v in = 12 v duty = 50% system run-away sense region system run-away sense region clock pulse duty cycle (%) clock pulse frequency f (hz) clock pulse frequency f (hz) allowable operation clock pulse duty cycle normal operation region
ha1835p/ha1848p 12 package dimensions hitachi code jedec eiaj mass (reference value) dp-14 conforms conforms 0.97 g unit: mm 7.62 0.25 0 ?15 19.20 20.32 max 1 8 14 7 1.30 2.54 0.25 0.48 0.10 6.30 7.40 max 0.51 min 2.54 min 5.06 max + 0.10 ?0.05 2.39 max
ha1835p/ha1848p 13 cautions 1. hitachi neither warrants nor grants licenses of any rights of hitachi? or any third party? patent, copyright, trademark, or other intellectual property rights for information contained in this document. hitachi bears no responsibility for problems that may arise with third party? rights, including intellectual property rights, in connection with use of the information contained in this document. 2. products and product specifications may be subject to change without notice. confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. hitachi makes every attempt to ensure that its products are of high quality and reliability. however, contact hitachi? sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. design your application so that the product is used within the ranges guaranteed by hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as fail- safes, so that the equipment incorporating hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the hitachi product. 5. this product is not designed to be radiation resistant. 6. no one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from hitachi. 7. contact hitachi? sales office for any questions regarding this document or hitachi semiconductor products. hitachi, ltd. semiconductor & integrated circuits. nippon bldg., 2-6-2, ohte-machi, chiyoda-ku, tokyo 100-0004, japan tel: tokyo (03) 3270-2111 fax: (03) 3270-5109 copyright ? hitachi, ltd., 2000. all rights reserved. printed in japan. hitachi asia ltd. hitachi tower 16 collyer quay #20-00, singapore 049318 tel : <65>-538-6533/538-8577 fax : <65>-538-6933/538-3877 url : http://www.hitachi.com.sg url northamerica : http://semiconductor.hitachi.com/ europe : http://www.hitachi-eu.com/hel/ecg asia : http://sicapac.hitachi-asia.com japan : http://www.hitachi.co.jp/sicd/indx.htm hitachi asia ltd. (taipei branch office) 4/f, no. 167, tun hwa north road, hung-kuo building, taipei (105), taiwan tel : <886>-(2)-2718-3666 fax : <886>-(2)-2718-8180 telex : 23222 has-tp url : http://www.hitachi.com.tw hitachi asia (hong kong) ltd. group iii (electronic components) 7/f., north tower, world finance centre, harbour city, canton road tsim sha tsui, kowloon, hong kong tel : <852>-(2)-735-9218 fax : <852>-(2)-730-0281 url : http://www.hitachi.com.hk hitachi europe ltd. electronic components group. whitebrook park lower cookham road maidenhead berkshire sl6 8ya, united kingdom tel: <44> (1628) 585000 fax: <44> (1628) 585160 hitachi europe gmbh electronic components group dornacher stra b e 3 d-85622 feldkirchen, munich germany tel: <49> (89) 9 9180-0 fax: <49> (89) 9 29 30 00 hitachi semiconductor (america) inc. 179 east tasman drive, san jose,ca 95134 tel: <1> (408) 433-1990 fax: <1>(408) 433-0223 for further information write to: colophon 2.0

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