1 of 5 rev: 041607 note: some revisions of this device may incor porate deviations from published specifications known as erra ta. multiple revisions of any device may be simultaneously available through various sales channel s. for information about device errata, click here: www.maxim-ic.com/errata . general description the DS600 is a 0.5c accurate analog-output temperature sensor. this accuracy is valid over its entire operating voltage range of 2.7v to 5.5v and the wide temperature range of -20c to +100c. the DS600 can also act as a thermostat, with user- programmable trip points. a shutdown mode enables the DS600 to be placed in a low-power standby state. the DS600 is available in an 8-pin sop package. applications cold-junction thermocouple compensation portable medical equipment thermally sensitive system s that require a high- accuracy analog-output temperature sensor typical operating circuit features ? 0.5c accuracy (-20c to +100c) ? 0.75c accuracy over entire temperature range of -40c to +125c ? requires no external components ? 6.45mv/c output gain with 509mv offset at 0c ? 2.7v to 5.5v supply voltage range ? user-programmable thermostat function ? shutdown function puts device into a low- power standby mode ? exposed pad 8-pin sop package for quick thermal response ordering information part temp range pin-package DS600u -40c to +125c exposed pad 8 sop DS600u+ -40c to +125c exposed pad 8 sop DS600u/t&r -40c to +125c exposed pad 8 sop tape-and-reel DS600u+/t&r -40c to +125c exposed pad 8 sop tape-and-reel + denotes lead-free package. pin configuration DS600 0.5 accurate analog-output tem p erature senso r www.maxim-ic.com top view pad v dd gnd to t o v out v th sd ctg 2.7v to 5.5v to/from c DS600 pad 8-pin sop package exposed pad
DS600 0.5c accurate analog-output temperature sensor 2 of 5 absolute maximum ratings voltage range on any pin (except ctg) relative to ground -0.5v to +6.0v voltage range on ctg relative to ground -0.5 to +0.5v operating temperature range -40c to +125c storage temperature range -55c to +125c soldering temperature (10s) +260c (see ipc/jedec j-std-020a) reflow oven temperature +220c stresses beyond those listed under ?absolute 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 i ndicated in the operational sections of t he specifications is not implied. exposure to the absolute maximum rating condi tions for extended periods may affect device reliability. dc electrical characteristics (v cc = 2.7v to 5.5v, t a = -40c to +125c.) parameter symbol conditions min typ max units supply voltage v dd 2.7 5.5 v -20c to +100c 0.5 thermometer error t err -40c to +125c 0.75 c output gain v/ t 6.45 mv/c v out dc offset v os 0c 509 mv low-level input voltage (sd) v il -0.5 0.3 x v dd v high-level input voltage (sd) v ih 0.7 x v dd v dd + 0.5 v sd input capacitance c sd 5 pf vth input capacitance c vth 5 pf low-level output voltage (to, to ) v ol 4ma sink current 0 0.4 v supply current i dd 140 a shutdown current i sd 2.5 a input current (v th ) i th 0.01 1 a input resistance (v th ) r th 5 m ? leakage current (sd) i l 0.01 1 a external load capacitance on v out c el 50 pf v out source current i oso 10 a v out sink current i osi 10 a output impedance (v out ) r out 100 ? power-up time t powerup 10 ms nonlinearity 0.2 c comparator offset 3 mv comparator response time t comp 20 ms
DS600 0.5c accurate analog-output temperature sensor 3 of 5 pin description pin name function 1 v dd supply voltage. 2.7v to 5.5v 2 to active-high thermostat output. open-drain output transitions fr om low to high when the output voltage exceeds v th . in shutdown mode, (sd = 1), to is low. 3 to active-low thermostat output. open-drain output transitions from high to low when the output voltage exceeds v th . in shutdown mode, (sd = 1), to is high. 4 v out temperature output. outputs a voltage that is proportional to the die temperature in degrees centigrade. in shutdown mode, this pin goes high-z. 5 v th thermostat trip voltage. user-selectable voltage that sets the thermostat trip-poi nt temperature. to and to are asserted when v out crosses this voltage. (no on-chip hysteresis is present). 6 sd shutdown. power consumption and thermal sensor func tion are controlled through sd. this pin functions as an active-high input pin. driving th is pin high puts the device in a low-power state and discontinues thermal sensing. 7 ctg must be connected to gnd. 8 gnd ground. pad pad. connect to gnd or float. do not connect to supply. the exposed pad is the best way to conduct temperature into the package. c onnecting pad to a ground plane can assist in properly measuring the temper ature of the circuit board. figure 1. block diagram temperature measurement the DS600 analog temperature sensor measures it own te mperature and provides these measurements to the user in the form of an output voltage, v out , that is proportional to degrees centigrade. the output voltage characteristic is factory-calibr ated for a typical output gain ( v/ t) of +6.45mv/c and a dc offset (v os ) of 509mv. its operating temperature range is -40c to +125c, co rresponding to an output voltage range of 251mv to 1315mv. (v out = device temperature (c) x v/ t + v os ). the DS600 has 0.5c accuracy over a -20c to +100c temperature range and over the full 2.7v to 5.5v voltage range. because the output voltage is positive for the entire temperature range, ther e is no need for a negative supply. figure 2 shows the output voltage characteristic for the DS600. temperature sensor v out v th to to sd v dd gnd control logic level-shift buffer thermostat comparator 2.7v to 5.5v DS600
DS600 0.5c accurate analog-output temperature sensor 4 of 5 figure 2. output vo ltage characteristic thermostat operation the DS600 can also be used as a thermostat with either an active-high (to) or active-low ( to ) output. to function as a thermostat, a precise voltage reference equal to the desired threshold must be applied to the v th pin. when the temperature with the equivalent voltage value is reached (voltage on v out = voltage on v th ), thermostat outputs to and to become active. figure 3 shows an example thermostat application circuit. figure 3. thermostat application circuit 80 0 100 -40 120 60 40 20 -20 0.2 0.6 1 1.4 DS600 output characteristic temperature (c) v out (v) 509mv 2.7v to 5.5v v dd gnd to t o v out v th sd ctg 500 k ? max6007a DS600 pad
DS600 0.5c accurate analog-output temperature sensor 5 of 5 package information maxim/dallas semiconductor cannot assume res ponsibility for use of any circuitry other than circuitry entirely embodied in a ma xim/dallas semiconductor product. no circuit patent licenses are implied. maxi m/dallas semiconductor reserves the right to change the circuitry and specification s without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2007 maxim integrated products ? printed usa for the latest package outline information, go to www.maxim-ic.com/dallaspackinfo .
|
