for free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. for small orders, phone 1-800-835-8769. general description the max6576/max6577 are low-cost, low-current tem- perature sensors with a single-wire output. the max6576 converts the ambient temperature into a square wave with a period proportional to absolute temperature (?). the max6577 converts the ambient temperature into a square wave with a frequency proportional to absolute temperature. the max6576 offers accuracy of ?? at +25?, ?.5? at +85?, and ?? at +125?. the max6577 offers accuracy of ?? at +25?, ?.5? at +85?, and ?.5? at +125?. both devices feature a single-wire output that minimizes the number of pins necessary to interface with a micro- processor. the period/frequency range of the output square wave can be selected by hard-wiring the two time-select pins (ts0, ts1) to either v dd or gnd. the max6576/max6577 are available in space-saving 6-pin sot23 packages. applications critical ? and ? temperature monitoring portable battery-powered equipment cell phones battery packs hard drives/tape drives networking and telecom equipment medical equipment automotive features ? simple single-wire output ? two output types available temperature to period (?) (max6576) temperature to frequency (hz) (max6577) ? ?.8? accuracy at +25? (?? max) ? no external components ? operates from +2.7v to +5.5v supply voltage ? low 140? typical supply current ? standard operating temperature range: -40? to +125? ? small 6-pin sot23 package max6576/max6577 sot temperature sensors with period/frequency output ________________________________________________________________ maxim integrated products 1 +2.7v to +5.5v gnd ts0 ts1 out 0.1 m f 0.1 m f v dd max6576 max6577 m p gnd i/o v cc 19-1484; rev 0; 4/99 part max6576 zut max6577 zut -40? to +125? -40? to +125? temp. range pin- package 6 sot23 6 sot23 typical operating circuit ordering information sot top mark aabi aabj gnd ts0 n.c. 16 out 5 ts1 v dd max6576 max6577 sot23-6 top view 2 34 pin configuration
max6576/max6577 sot temperature sensors with period/frequency output 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v dd = +2.7v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are specified at t a = +25? and v dd = +5v, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: see the temperature accuracy histograms in the typical operating characteristics . note 2: the output duty cycle is guaranteed to be 50% by an internal flip-flop. terminal voltage (with respect to gnd) v dd ......................................................................-0.3v to +6v ts1, ts0, out.......................................-0.3v to (v dd + 0.3v) input/output current, all pins...........................................?0ma continuous power dissipation (t a = +70?) 6-pin sot23 (derate 7.10mw/? above +70?).........571mw operating temperature range .........................-40? to +125? storage temperature range.. ...........................-65? to +150? lead temperature (soldering, 10sec) .............................+300? max6576 v dd = 5.5v v dd > 2.7v, i sink = 1.2ma v dd > 4.5v, i sink = 3.2ma max6576, t (temp) in ?, figure 1 max6577 conditions 0.3 v 0.4 v ol out voltage 2.3 v ih v 0.8 v il time-select pin logic levels 0.5 out duty cycle (note 2) 640t ? -7.5 ?.1 +7.5 temperature sensor error (note 1) ? 140 250 i dd v 2.7 5.5 v dd v dd range supply current 160t 40t ? 10t t out output clock period -3.0 ?.8 +3.0 -5.5 ?.9 +5.5 -3.0 ?.8 +3.0 -7.5 ?.1 +7.5 -6.5 ?.9 +6.5 units min typ max symbol parameter t a = -20? t a = 0? t a = +25? t a = -20? t a = 0? t a = +25? v ts1 = v dd , v ts0 = v dd max6577, t (temp) in ?, figure 2 v ts1 = v dd , v ts0 = v dd t/16 t/4 1t hz 4t f out output clock frequency v dd > 4.5v, i src = 800? v dd - 1.5 v oh v dd > 2.7v, i src = 500? 0.8v dd v ts1 = gnd, v ts0 = gnd v ts1 = gnd, v ts0 = v dd v ts1 = v dd , v ts0 = gnd v ts1 = gnd, v ts0 = gnd v ts1 = gnd, v ts0 = v dd v ts1 = v dd , v ts0 = gnd t a = -40? to +85? t a = -40? to +125? 400 ? -3.5 ?.5 +3.5 t a = +85? -4.5 ?.5 +4.5 t a = +125? t a = +85? -4.5 ?.5 +4.5 t a = +125? -5.0 ?.5 +5.0
max6576/max6577 sot temperature sensors with period/frequency output _______________________________________________________________________________________ 3 0 10 5 15 20 25 30 35 -5 -3 -2 -4 -1012345 temperature accuracy (t a = +25 c) max6576 toc01 accuracy ( c) percentage of parts sampled (%) max6576 max6577 sample size = 200 0 20 10 30 40 50 60 -5 -3 -2 -4 -1012345 temperature accuracy (t a = +85?) max6576 toc01 accuracy (?) percentage of parts sampled (%) max6576 max6577 sample size = 200 100 130 120 110 150 140 170 160 180 -40 -10 5 20 -25 35 50 65 80 95 110 125 supply current vs. temperature max6576/77toc02 temperature ( c) supply current ( m a) max6577 max6576 -1.0 0 -0.5 1.0 0.5 1.5 -40 -10 5 20 -25 35 50 65 80 95 110 125 accuracy vs. temperature max6575 toc04 temperature ( c) accuracy ( c) max6576 max6577 +15 c/div +100 c +25 c thermal step response in perfluorinated fluid max6576/77 toc05 5sec/div mounted on 0.75 in. 2 of 2oz. copper +12.5 c/div +100 c +25 c thermal step response in still air max6576/77 toc06 20sec/div mounted on 0.75 in. 2 of 2oz. copper typical operating characteristics (v dd = +5v, t a = +25?, unless otherwise noted.)
table 1. max6576 time-select pin configuration table 2. max6577 time-select pin configuration max6576/max6577 sot temperature sensors with period/frequency output 4 _______________________________________________________________________________________ pin description detailed description the max6576/max6577 low-cost, low-current (140? typ) temperature sensors are ideal for interfacing with microcontrollers ( cs) or microprocessors ( ps). the max6576 converts ambient temperature into a 50% duty- cycle square wave with a period proportional to absolute temperature. the max6577 converts ambient tempera- ture into a 50% duty-cycle square wave with a frequency proportional to absolute temperature. time-select pins (ts1, ts0) permit the internal temperature-controlled oscillator (tco) to be scaled by four preset multipliers. the max6576/max6577 feature a single-wire interface to minimize the number of port pins necessary for interfac- ing with a ?. max6576 characteristics the max6576 temperature sensor converts tempera- ture to period. the output of the device is a free- running, 50% duty-cycle square wave with a period that is proportional to the absolute temperature ( k) of the device (figure 1). the max6576 has a push/pull cmos output with sharp edges. the speed of the output square wave can be selected by hard-wiring ts1 and ts0 as shown in table 1. one of four scaled output periods can be selected using ts1 and ts0. max6577 characteristics the max6577 temperature sensor converts tempera- ture to frequency. the output of the device is a free- running, 50% duty-cycle square wave with a frequency that is proportional to the absolute temperature (?) of the device (figure 2). the max6577 has a push/pull cmos output with sharp edges. the speed of the out- put square wave can be selected by hard-wiring ts1 and ts0 as shown in table 2. one of four scaled output frequencies can be selected using ts1 and ts0. gnd gnd v dd gnd v dd gnd 10 40 160 v dd v dd 640 ts1 ts0 scalar multiplier (?/?) note: the temperature, in ?, may be calculated as follows: gnd gnd v dd gnd v dd gnd 4 1 1/4 ts1 ts0 scalar multiplier (hz/?) v dd v dd 1/16 1 2 3 positive supply voltage ground no connection. connect pin to gnd or leave open. function 4, 5 time-select pins. ts1 and ts0 set the temperature scale factor by connecting ts1 and ts0 to either v dd or gnd. see tables 1 and 2. pin n.c. gnd v dd name ts1, ts0 note: the temperature, in ?, may be calculated as follows: t( c) period( s) scalar mulitplier( s/ k) 273.15 k = - m m t( c) frequency(hz) scalar mulitplier(hz/ k) 273.15 k = - 6 square-wave output with a clock frequency proportional to absolute temperature ( k) (max6577) out square-wave output with a clock period proportional to absolute temperature (?) (max6576)
applications information quick-look circuits figure 3 shows a quick-look application circuit for the max6576 using a universal counter measuring period. ts1 and ts0 are both tied to ground to select a scalar multiplier of 10?/?. the max6576 converts the ambi- ent temperature into a square wave with a period that is 10 times the absolute temperature of the device in ?. at room temperature, the universal counter will display approximately 2980?. figure 4 shows a quick-look application circuit for the max6577 using a universal counter measuring frequen- cy. ts1 is tied to ground and ts0 is tied to v dd to select a scalar multiplier of 1hz/?. the max6577 con- verts the ambient temperature into a square wave with a frequency that is equal to the absolute temperature of the device in hertz. at room temperature, the universal counter will display approximately 298hz. interfacing with a microcontroller figure 5 shows the max6577 interfaced with an 8051 ?. in this example, ts1 is tied to ground and ts0 is tied to v dd to select a scalar multiplier of 1hz/?. the max6577 converts the ambient temperature into a square wave with a frequency that is equal to the absolute temperature of the device in hertz. the 8051 ? reads the frequency of the square-wave output of the max6577 into timer 0 and displays the temperature as degrees celsius in binary on port 1. listing 1 pro- vides the code for this application. the interface is simi- lar for the max6576, except the ? will perform a period measurement. noise considerations the accuracy of the max6576/max6577 is susceptible to noise generated both internally and externally. the effects of external noise can be minimized by placing a 0.1? ceramic bypass capacitor close to the supply pin of the devices. internal noise is inherent in the opera- tion of the devices and is detailed in table 3. internal averaging minimizes the effect of this noise when using longer scalar timeout multipliers. the effects of this noise are included in the overall accuracy of the devices as specified in the electrical characteristics . max6576/max6577 sot temperature sensors with period/frequency output _______________________________________________________________________________________ 5 t out max6576 clock waveform output t out f out = 1 / t out f out (?) max6577 clock waveform output figure 1. max6576 timing diagram figure 2. max6577 timing diagram
max6576/max6577 sot temperature sensors with period/frequency output 6 _______________________________________________________________________________________ gnd ts0 ts1 out 0.1 m f v dd +2.7v to +5.5v universal counter "frequency" max6577 gnd ts0 ts1 out 0.1 m f v dd +2.7v to +5.5v gnd x2 x1 t0 470 w x 8 v cc p1.1 p1.0 p1.2 p1.3 p1.4 p1.5 p1.6 p1.7 8051 12mhz 22pf 22pf max6577 figure 4. max6577 quick-look circuit gnd ts0 ts1 out 0.1 m f v dd +2.7v to +5.5v universal counter "period" max6576 figure 3. max6576 quick-look circuit figure 5. interfacing with a ? table 3. typical peak noise amplitude parameter noise amplitude (?) max6577 ?.38 max6576 ?.17 scalar multiplier 10 40 ?.11 160 ?.094 640 ?.13 4 ?.066 1 ?.040 1/4 ?.028 1/16 chip information transistor count: 302
max6576/max6577 sot temperature sensors with period/frequency output _______________________________________________________________________________________ 7 listing 1. 8051 code example
max6576/max6577 sot temperature sensors with period/frequency output maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 1999 maxim integrated products printed usa is a registered trademark of maxim integrated products. listing 1. 8051 code example (continued) 6lsot.eps package information
e nglish ? ???? ? ??? ? ??? what's ne w p roducts solutions de sign ap p note s sup p ort buy comp any me mbe rs max6576 part number table notes: see the max6576 quickview data sheet for further information on this product family or download the max6576 full data sheet (pdf, 152kb). 1. other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales . 2. didn't find what you need? ask our applications engineers. expert assistance in finding parts, usually within one business day. 3. part number suffixes: t or t&r = tape and reel; + = rohs/lead-free; # = rohs/lead-exempt. more: see full data sheet or part naming c onventions . 4. * some packages have variations, listed on the drawing. "pkgc ode/variation" tells which variation the product uses. 5. part number free sample buy direct package: type pins size drawing code/var * temp rohs/lead-free? materials analysis max6576lzut+ sot-23;6 pin; dwg: 21-0058i (pdf) use pkgcode/variation: u6+4 * -40c to +85c rohs/lead-free: yes materials analysis max6576lzut sot-23;6 pin; dwg: 21-0058i (pdf) use pkgcode/variation: u6-4 * -40c to +85c rohs/lead-free: no materials analysis max6576zut+ sot-23;6 pin; dwg: 21-0058i (pdf) use pkgcode/variation: u6+4 * -40c to +85c rohs/lead-free: yes materials analysis max6576zut sot-23;6 pin; dwg: 21-0058i (pdf) use pkgcode/variation: u6-4 * -40c to +85c rohs/lead-free: no materials analysis MAX6576ZUT-T sot-23;6 pin; dwg: 21-0058i (pdf) use pkgcode/variation: u6-4 * -40c to +85c rohs/lead-free: no materials analysis max6576lzut+t sot-23;6 pin; dwg: 21-0058i (pdf) use pkgcode/variation: u6+4 * -40c to +85c rohs/lead-free: yes materials analysis max6576lzut-t -40c to +85c rohs/lead-free: no didn't find what you need?
max6576zut+t sot-23;6 pin; dwg: 21-0058i (pdf) use pkgcode/variation: u6+4 * -40c to +85c rohs/lead-free: yes materials analysis didn't find what you need? c ontac t us: send us an email c opyright 2 0 0 7 by m axim i ntegrated p roduc ts , dallas semic onduc tor ? legal n otic es ? p rivac y p olic y
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