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LTC2996 1 2996f typical a pplica t ion fea t ures descrip t ion temperature sensor with alert outputs the ltc ? 2996 is a high accuracy temperature sensor with adjustable overtemperature and undertemperature thresholds and open drain alert outputs. it converts the temperature of an external diode sensor or its own die temperature to an analog output voltage while rejecting errors due to noise and series resistance. the measured temperature is compared against upper and lower limits set with resistive dividers. if a threshold is exceeded, the device communicates an alert by pulling low the corre - spondent open drain logic output. the LTC2996 gives 1c accurate temperature results using commonly available npn or pnp transistors or temperature diodes built into modern digital devices. a 1.8v reference output simplifies threshold programming and can be used as an adc reference input. the LTC2996 provides an accurate, low power solution for temperature monitoring in a compact 3mm 3mm dfn package. remote temperature monitor with overtemperature and undertemperature thresholds a pplica t ions n converts remote or internal diode temperature to a nalog voltage n adjustable overtemperature and undertemperature th resholds n voltage output proportional to temperature n 1c remote temperature accuracy n 2c internal temperature accuracy n built-in series resistance cancellation n open drain alert outputs n 2.25v to 5.5v supply voltage n 1.8v reference voltage output n 200a quiescent current n 10-lead 3mm 3mm dfn package n temperature monitoring and measurement n system thermal control n network servers n desktop and notebook computers n environmental monitoring l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. v ptat vs remote diode temperature remote diode temperature (c) ?50 0.8 v ptat (v) 1.0 1.2 1.4 0 50 100 150 2996 ta01b 1.6 1.8 ?25 25 75 125 v ref vth vtl v ptat ot ut d + d ? LTC2996 1.8v 2.25v to 5.5v 0.1f 43k 36k 102k 2996 ta01a gnd v cc 470pf mmbt3904 ot t > 70c ut t < ?20c 4mv/k temperature control system
LTC2996 2 2996f p in c on f igura t ion a bsolu t e maxi m u m r a t ings (notes 1, 2) top view 11 dd package 10-lead (3mm 3mm) plastic dfn 10 9 6 7 8 4 5 3 2 1 ot ut v ref gnd v cc vth vtl d + d ? v ptat t jmax = 150c, ja = 43c/w exposed pad pcb ground connection optional symbol parameter conditions min typ max units v cc supply voltage l 2.25 5.5 v uvlo supply undervoltage lockout threshold v cc falling l 1.7 1.9 2.1 v i cc average supply current l 200 300 a temperature measurement v ref reference voltage LTC2996 LTC2996c LTC2996i, LTC2996h l l 1.797 1.795 1.790 1.8 1.8 1.8 1.803 1.805 1.808 v v v v ref load regulation i load = 200a, v cc = 3.3v l 1.5 mv diode select threshold (note 3) l v cc C 600 v cc C 300 v cc C 100 mv remote diode sense current C8 C192 a o r d er i n f or m a t ion v cc .............................................................. C0 .3v to 6v d + , d C , v ptat , v ref ............................. C0 .3v to v cc + 0.3v ot , ut , vth, vtl ......................................... C0 .3v to 6v operating ambient temperature range lt c2996c ................................................ 0 c to 70c lt c2996i ............................................. C 40c to 85c lt c2996h .......................................... C 40c to 125c storage temperature range .................. C 65c to 150c lead free finish tape and reel part marking* package description temperature range LTC2996cdd#pbf LTC2996cdd#trpbf lfqx 10-lead (3mm 3mm) plastic qfn 0c to 70c LTC2996idd#pbf LTC2996idd#trpbf lfqx 10-lead (3mm 3mm) plastic qfn C40c to 85c LTC2996hdd#pbf LTC2996hdd#trpbf lfqx 10-lead (3mm 3mm) plastic qfn C40c to 125c consult ltc marketing for parts specified with wider operating temperature ranges. *temperature grades are identified by a label on the shipping container. consult ltc marketing for information on lead based finish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ e lec t rical c harac t eris t ics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c, v cc = 3.3v, unless otherwise noted.
LTC2996 3 2996f e lec t rical c harac t eris t ics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c, v cc = 3.3v, unless otherwise noted. note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: all currents into pins are positive; all voltages are referenced to gnd unless otherwise noted. note 3: if voltage on pin d + exceeds the diode select threshold the LTC2996 uses the internal diode sensor. note 4: remote diode temperature, not LTC2996 temperature. note 5: guaranteed by design and test correlation. symbol parameter conditions min typ max units t conv temperature update interval 3.5 5 ms k t v ptat slope ideality factor = 1.004 4 mv/k v ptat load regulation i load = 200a 1.5 mv t int internal temperature accuracy LTC2996c, LTC2996i LTC2996h l l 0.5 0.5 0.5 1 2 3 c c c t rmt remote temperature error, = 1.004 0c to 85c (notes 4, 5) C40c to 0c (notes 4, 5) 85c to 125c (notes 4, 5) 0.25 0.25 0.25 1 1.5 1.5 c c c temperature noise 0.15 0.01 c rms c rms /hz t vcc temperature error vs supply l 0.5 c/v t rs series resistance cancellation error r series = 100 l 0.25 1 c temperature monitoring t off vth, vtl offset l C3 C1 1 c ?t hyst ot, ut temperature hysteresis l 2 5 10 c i in vth, vtl, input current l 20 na digital outputs v oh high level output voltage, ot, ut i = C0.5a l v cc C 1.2 v v ol low level output voltage, ot, ut i = 3ma l 0.4 v
LTC2996 4 2996f typical p er f or m ance c harac t eris t ics remote temperature error vs series resistance remote temperature error vs c decouple (between d + and d C ) temperature error with LTC2996 at same temperature as remote diode remote temperature error vs ambient temperature internal temperature error vs ambient temperature uvlo vs temperature v cc rising, falling buffered reference voltage vs temperature temperature error vs supply voltage v ptat noise vs averaging time t a = 25c, v cc = 3.3v unless otherwise noted. t a (c) ?50 ?3 t rmt error (c) ?2 0 ?1 75 100 2996 g01 3 1 2 ?25 0 25 50 125 t internal = t remote t a (c) ?50 ?3 t rmt error (c) ?2 0 ?1 75 100 2996 g02 3 1 2 ?25 0 25 50 125 t remote = 35c t a (c) ?50 ?3 t int error (c) ?2 0 ?1 75 100 2996 g03 3 1 2 ?25 0 25 50 125 v cc (v) 1 ?0.4 error (c) ?0.2 ?0.3 0.1 0.2 0.0 ?0.1 3 5 2996 g04 0.3 0.4 2 4 6 series resistance () 0 ?6 error (c) ?4 0 ?2 800600 2996 g05 2 6 4 200 400 1200 1000 decouple capacitor (nf) 0 error (c) 0 ?2 ?4 ?6 86 2996 g06 4 2 6 2 4 10 averaging time (ms) 0.01 0 v ptat noise (c rms) 0.05 0.10 0.15 1 1000 2996 g07 0.20 0.1 10 100 t a (c) ?50 1.8 uvlo (v) 2.0 2.1 1.9 25 75 150 2996 g08 2.2 0 ?25 50 100 125 v cc rising v cc falling t a (c) 1.790 v ref (v) 1.795 2996 g09 1.800 1.810 1.805 ?60 0 60 160 ?20 ?40 4020 80 100 140
LTC2996 5 2996f typical p er f or m ance c harac t eris t ics supply current vs temperature remote temperature error vs leakage current at d + with remote diode at 25c, t rmt load regulation of v ptat voltage vs current single wire remote temperature error vs ground noise load regulation of v ref voltage vs current t a = 25c, v cc = 3.3v unless otherwise noted. ut, ot, vs output sink current frequency (khz) 0.1 0.01 absolute temperature error (c) 0.1 1 10 1000 2996 g12 1 10 100 vac = 50mv p-p i (ma) v uv/ov/to1/to2 (v) 0 10 20 30 2996 g14 0.6 0.4 0.2 0 1 0.8 40 t a (c) ?50 180 supply current (a) 210 200 190 50 100 2996 g16 220 ?25 0 25 75 125 150 i leakage (na) ?200 ?6 t rmt error (c) 4 2 0 ?2 ?4 0 100 2996 g17 6 ?100 200 load current (ma) 1.780 v ref (v) 1.800 1.790 0 2996 g10 1.820 1.810 ?4 ?2 2 4 v cc = 2.5v v cc = 3.5v v cc = 4.5v v cc = 5.5v load current (ma) ?4 1.16 v ptat (v) 1.17 1.20 1.19 1.18 ?2 0 4 2996 g11 1.21 1.22 2 v cc = 2.5v v cc = 3.5v v cc = 4.5v v cc = 5.5v
LTC2996 6 2996f p in func t ions d + : diode sense current source. d + sources the remote diode sensing current. connect d + to the anode of the re - mote sensor device. it is recommended to connect a 470pf bypass capacitor between d + and d C . larger capacitors may cause settling time errors (see typical performance characteristics). if d + is tied to v cc , the LTC2996 measures the internal sensor temperature. tie d + to v cc if unused. d C : diode sense current sink. connect d C to the cathode of the remote sensor device. tie d C to gnd for single wire remote temperature measurement (see applications information) or internal temperature sensing. exposed pad: exposed pad may be left open or soldered to gnd for better thermal coupling. gnd: device ground ut : undertemperature logic output. open drain logic output that pulls to gnd when v ptat is below the threshold voltage on pin vtl. when v ptat rises above the threshold voltage on pin vtl, an additional hysteresis of 20mv is required to release ut high. ut has a weak 400k pull- up to v cc and may be pulled above v cc using an external pull-up. leave ut open if unused. ot : overtemperature logic output. open drain logic output that pulls to gnd when v ptat is above the threshold voltage on pin vth. when v ptat falls below the threshold voltage on pin vth, an additional hysteresis of 20mv is required to release ot high. ot has a weak 400k pull-up to v cc and may be pulled above v cc using an external pull-up. leave ot open if unused. v ptat : proportional to absolute temperature voltage out - put. the voltage on this pin is proportional to the sensors absolute temperature. v ptat can drive up to 200a of load current and up to 1000pf of capacitive load. for larger load capacitances insert 1k between v ptat and the load to ensure stability. v ptat is pulled low when the supply voltage goes below the under voltage lockout threshold. v ref : voltage reference output. v ref provides a 1.8v reference voltage. v ref can drive up to 200a of load current and up to 1000pf of capacitive load. for larger load capacitances, insert 1k between v ref and the load to ensure stability. leave v ref open if unused. vtl: temperature threshold low. when v ptat is below the voltage on vtl, ut is pulled low. tie vtl to gnd if unused. vth: temperature threshold high. when v ptat is above the voltage on vth, ot is pulled low. tie vth to v cc if unused.
LTC2996 7 2996f b lock diagra m 2996 bd ct2 ct1 vth v ref vtl v ptat ? + ? + ? + 200k 1.2v 1.8v 400k uvlo 8 1 2 5 4 d ? d + gnd 3 t to v converter ot/ut pulse generator ot v cc 400k ut v cc 400k 7 9 10 v cc 6 1
LTC2996 8 2996f o pera t ion overview the LTC2996 provides a buffered voltage proportional to the absolute temperature of either an internal or a remote diode (v ptat ) and compares this voltage to thresholds that can be set by external resistor dividers from the on-board reference (v ref ). remote temperature measurements usually use a diode connected transistor as a temperature sensor, allowing the remote sensor to be a discrete npn (ex. mmbt3904) or an embedded device in a microprocessor or fpga. diode temperature sensor temperature measurements are conducted by measuring the voltage of either an internal or an external diode with multiple test currents. the relationship between diode voltage v d and diode current i d can be solved for absolute temperature in degrees kelvin t: ? ? ? ? ? ? t = q ? k ? v d ln i d i s where i s is a process dependent factor on the order of 10 C13 a, is the diode ideality factor, k is the boltzmann constant and q is the electron charge. this equation shows a relationship between temperature and voltage dependent on the process depended variable i s . measuring the same diode (with the same value i s ) at two different currents (i d1 and i d2 ) yields an expression independent of i s : ln i d2 i d1 ? ? ? ? ? ? t = q ? k ? v d2 ? v d1 series resistance cancellation resistance in series with the remote diode causes a positive temperature error by increasing the measured voltage at each test current. the composite voltage equals: ? ? ? ? ? ? v d + v error = kt q ? ln i d i s + r s ? i d the LTC2996 removes this error term from the sensor signal by subtracting a cancellation voltage v cancel . a resistance extraction circuit uses one additional current measurement to determine the series resistance in the measurement path. once the correct value of the resistor is determined, v cancel equals v error . now the temperature to voltage converter input signal is free from errors due to series resistance. LTC2996 cancels series resistances up to several hundred ohms (see typical performance characteristics curves). higher series resistances cause the cancelation voltage to saturate.
LTC2996 9 2996f temperature measurements before each conversion, a voltage comparator connected to d + automatically sets the LTC2996 into external or internal mode. tying d + to v cc enables internal mode, where v ptat represents the die temperature. for v d + more than 300mv below v cc (typical), the LTC2996 assumes that an external sensor is connected. the LTC2996 continuously measures the sensor diode at different test currents and generates a voltage proportional to the absolute temperature of the sensor at the v ptat pin. the voltage at v ptat is updated every 3.5ms. the gain of v ptat is calibrated to 4mv/k for the measure - ment of the internal diode as well as for remote diodes with an ideality factor of 1.004. t kelvin = v ptat 4mv/k ( = 1.004) if an external sensor with an ideality factor different from 1.004 is used, the gain of v ptat will be scaled by the ratio of the actual ideality factor ( act ) to 1.004. in these cases the temperature of the external sensor can be calculated from v ptat by: t kelvin = v ptat 4mv/k ? 1.004 act temperature in degrees celsius can be deduced from degrees kelvin by: t celsius = t kelvin C 273.15 choosing an external sensor the LTC2996 is factory calibrated for an ideality factor of 1.004, which is typical of the popular mmbt3904 npn transistor. semiconductor purity and wafer level process - ing intrinsically limit device-to-device variation, making these devices interchangeable between manufacturers with a temperature error of typically less than 0.5c. some recommended sources are listed in table 2: a pplica t ions i n f or m a t ion table 2. recommended transistors for use as temperature sensors manufacturer part number package fairchild semiconductor mmbt3904 sot-23 central semiconductor cmbt3904 sot-23 diodes inc. mmbt3904 sot-23 on semiconductor mmbt3904lt1 sot-23 nxp mmbt3904 sot-23 infineon mmbt3904 sot-23 rohm umt3904 sc-70 discrete two terminal diodes are not recommended as remote sensing devices as their ideality factor is typically much higher than 1.004. also, mos transistors are not suitable as they dont exhibit the required current to tem - perature relationship. furthermore, gold doped transistors (low beta), high frequency and high voltage transistors should be avoided as remote sensing devices. connecting an external sensor the anode of the external sensor must be connected to pin d + . the cathode should be connected to d C for best external noise immunity. the change in sensor voltage per c is hundreds of microvolts, so electrical noise must be kept to a mini - mum. bypass d + and d C with a 470pf capacitor close to the LTC2996 to suppress external noise. recommended shielding and pcb trace considerations for best noise immunity are illustrated in figure 1. figure 1. recommended pcb layout leakage currents at d + affect the precision of the remote temperature measurements. 100na leakage current leads to an additional error of 2c (see typical performance characteristics). d + d ? LTC2996 2996 f01 gnd 470pf gnd shield trace npn sensor
LTC2996 10 2996f d + d ? 470pf LTC2996 2n3904 2996 f02 gnd a pplica t ions i n f or m a t ion note that bypass capacitors greater than 1nf will cause settling time errors of the different measurement cur - rents and therefore introduce an error in the temperature measurement (see typical performance characteristics). the LTC2996 compensates series resistance in the measurement path and thereby allows accurate remote temperature measurements even with several meters of distance between the sensor and the device. the cable length between the sensor and the LTC2996 is only limited by the mutual capacitance introduced between d + and d C which degrades measurement accuracy (see typical performance characteristics). for example, a cat6 cable with 50pf/m should be kept shorter than ~20m to keep the capacitance less than 1nf. to save wiring, the cathode of the remote sensor can also be connected to remote gnd and d C to local gnd as shown below. the LTC2996 can withstand up to 4kv of electrostatic discharge (esd, human body model). esd beyond this voltage can damage or degrade the device including lowering the remote sensor measurement accuracy due to increased leakage currents on d + or d C . to protect the sensing inputs against larger esd strikes, external protection can be added using tvs diodes to ground (figure 3). care must be taken to choose diodes with low capacitance and low leakage currents in order not to degrade the external sensor measurement accuracy (see typical performance characteristics curves). the temperature measurement of LTC2996 relies only on differences between the diode voltage at multiple test circuits. therefore dc offsets smaller than 300mv between remote and local gnd do not impact the precision of the temperature measurement. the cathode of the sensor can accommodate modest ground shifts across a system which is beneficial in applications where a good thermal connectivity of the sensor to a device whose temperature is to be monitored (shunt resistor, coil, etc.) is required. care must be taken if the potential difference between the cathode and d C does not only contain dc but also ac components. noise around odd multiples of 6khz (20%) is amplified by the measurement algorithm and converted to a dc offset in the temperature measurement (see typical performance characteristics). figure 2. single wire remote temperature sensing figure 3. increasing esd robustness with tvs diodes to make the connection of the cable to the ic polarity insensitive during installation, two sensor transistors with opposite polarity at the end of a two wire cable can be used as shown on figure 4. figure 4. polarity insensitive remote diode sensor d + d ? 220pf 10 LTC2996 mmbt3904 pesd5z6.0 2996 f03 gnd 10 d + d ? LTC2996 mmbt3904 470pf 2995 f04 gnd again, care must be taken that the leakage current of the second transistor does not degrade the measurement accuracy.
LTC2996 11 2996f a pplica t ions i n f or m a t ion output noise filtering the v ptat output typically exhibits 0.6mv rms (0.25c rms) noise. for applications which require lower noise, digital or analog averaging can be applied to the output. choose the averaging time according to: 2 ? ? ? ? ? ? t avg = 0.01 [ ] c hz t noise where t avg is the averaging time and t noise the desired temperature noise in c rms. for example, if the desired noise performance is 0.01c rms, set the averaging time to one second. see typical performance characteristics. temperature monitoring the LTC2996 continuously compares the voltage at v ptat to the voltages at the pins vth and vtl to detect either an overtemperature (ot) or undertemperature (ut) condition. the vth comparator output drives the open-drain logic output pin ot and the vtl comparator output drives the open-drain logic output pin ut . the voltage at v ptat must exceed a threshold for five consecutive temperature update intervals (3.5ms each) before the respective output pin is pulled low. once the v ptat voltage crosses the threshold with an additional 20mv of hysteresis, the respective output pin is released after a single update interval. temperature monitor design example the LTC2996 can be configured to give an alert if the temperature of the internal sensor falls below 0c or rises above 90c. tie the d + pin to v cc to select the internal sensor. the voltages at vtl and vth are set to: vtl = (0k + 273.15k) ? 4 mv k = 1.093v vth = (90k + 273.15k) ? 4 mv k = 1.453v when v ptat falls below 1.093v, ut is pulled low. once the temperature rises again and v ptat reaches 1.093v plus a hysteresis of 20mv, ut is released high again. accord - ingly, ot is pulled low if temperature increases to 90c as v ptat reaches 1.453v and is released high if v ptat drops again below 1.433v. temperature thresholds the threshold voltages at vtl and vth can be set with the 1.8v reference voltage (v ref ) and a resistive divider as shown in figure 5. figure 5. temperature thresholds the following design procedure can be used to size the resistive divider. 1. ca lculate threshold voltages: vtl = t1 ? 4 mv k ? act 1.004 vth = t2 ? 4 mv k ? act 1.004 2996 f05 v ptat r tc r tb r ta v ref = 1.8v 1.8v slope = ? 4 1.004 act o t 200k t 1 t 2 450k vt2 vt1 o.8v k mv
LTC2996 12 2996f figure 6. monitoring internal temperature a pplica t ions i n f or m a t ion where act denotes the actual ideality factor if an external sensor is used and t1 and t2 are the desired threshold temperatures in degrees kelvin. 2. ch oose r ta to obtain the desired vtl threshold for a des ired current through the resistive divider (i ref ): r ta = vtl i ref 3. choose r tb to obtain the desired vth threshold: r tb = vth C vtl i ref 4. finally r tc is determined by: r tc = 1.8v C vth i ref in the temperature monitor example discussed earlier with thresholds at vtl = 0c and vth = 90c and a desired reference current of 10a, the required values for r ta , r tb and r tc can be calculated as : r ta = 1.093v 10a = 109.3k r tb = 1.453v C 1.093v 10a = 36k r tc = 1.8v C 1.453v 10a = 34.7k d + d ? 1.2v 200k 400k 1.8v v cc v ref r tc vth vtl v cc v ptat ot ut 3.3v LTC2996 2996 f06 r tb r ta gnd ? + ? + ? + ot/ut pulse generator uvlo v cc 400k v cc 400k t/v
LTC2996 13 2996f a pplica t ions i n f or m a t ion v ref vth vtl v ptat ot ut d + d ? LTC2996 1.8v 2.25v to 5.5v 0.1f 43k 36k 102k 2996 ta02 gnd v cc 470pf mmbt3904 ot t > 70c ut t < ?20c 4mv/k temperature control system v ref vth vtl int1 int2 v ptat ot ut d + d ? LTC2996 1.8v 2.25v to 5.5v 0.1f 20.5k 38.3k 121k 2996 ta03 gnd v cc 470pf ot t > 125c ut t < 30c cpu/ fpga/ asic internal diode remote temperature monitor with overtemperature and undertemperature thresholds asic/fpga/processor temperature monitor analog heater controller v ref vth vtl v ptat 0.1f ut d + d ? LTC2996 1.8v 1.09v 1.49v 5v 30.9k 40.2k 110k 2996 ta04 gnd v cc 470pf ot high if t < 0c high if t < 100c 10 r heater irf3708 2n7000 mmbt3904 b6015l12f
LTC2996 14 2996f typical a pplica t ions 2996 ta05 v ref vth vtl ut d + ot v ptat d ? LTC2996 0.1f 43.2k 28k 110k gnd v cc v ref vth vtl ut d + ot v ptat d ? LTC2996 2.25v to 5.5v 0.1f 43.2k 28k 110k gnd v cc int low if temperature of any cell t cell > 70c or t cell < 0c t alert battery supervisor 10k battery stack temperature supervisor
LTC2996 15 2996f information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. p ackage descrip t ion please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. 3.00 0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (weed-2). check the ltc website data sheet for current status of variation assignment 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom view?exposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.125 typ 2.38 0.10 (2 sides) 1 5 10 6 pin 1 top mark (see note 6) 0.200 ref 0.00 ? 0.05 (dd) dfn rev c 0310 0.25 0.05 2.38 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 0.05 (2 sides) 2.15 0.05 0.50 bsc 0.70 0.05 3.55 0.05 package outline 0.25 0.05 0.50 bsc dd package 10-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1699 rev c) pin 1 notch r = 0.20 or 0.35 45 chamfer
LTC2996 16 2996f linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 2012 lt 0712 ? printed in usa r ela t e d p ar t s typical a pplica t ion part number description comments ltc2990 quad i 2 c voltage, current and temperature monitor measures voltage, current, internal temperature and/or two remote diode temperatures, 0.5c (typ) accuracy, 0.06c resolution, i 2 c interface ltc2991 octal i 2 c voltage, current and temperature monitor measures voltage, current, internal temperature and/or four remote diode temperatures, 0.7c (typ), 0.06c resolution, i 2 c interface, pwm output ltc2995 temperature sensor and voltage monitor with alert outputs monitors temperature and two voltages, adjustable thresholds, open drain alert outputs, temperature to voltage output with integrated 1.8v reference, 1c (max) accuracy ltc2997 remote/internal temperature sensor converts remote sensor or int. diode temperature to analog voltage, integrated 1.8v reference, 1c (max) accuracy ltc1077 micropower, single supply, precision op amp 60a supply current, 40v offset, low noise celsius thermometer and 20c to 25c thermostat d + d ? ot ut v ptat 5lpcv24110 mmbt3904 heater 220v ac 2996 ta06 LTC2996 5v 0.1f gnd vtl vth v ref v cc 470pf 118k 63.4k 4mv/k 1.8v 1k 143k 62k 150k 0.1f 1.8k 5v 100k 1f ? + ltc1077 10mv/c 0v at 0c 215mv corresponds to 21.5c voltmeter

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