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TS12001 page 1 ? 2014 silicon laboratories, inc. all rights reserved. features ? nanopower voltage detector in single 4 mm 2 package ? ultra low total supply current: 1a (max) ? supply voltage operation: 0.65v to 2.5v ? preset 0.78v uvlo trip threshold ? internal 10mv hysteresis ? resettable latched comparator ? complimentary and open-drain comparator outputs ? separate comparator output supply pin applications power-fail indicator low-battery detection battery-backup detection cpu, microprocessor, and logic reset controller battery-powered systems description the TS12001 voltage detector combines a 0.58v reference and a comparator with resettable comparator latch in a single package. the TS12001 operates from a single 0.65v to 2.5v power supply and consumes less than 1a total supply current. optimized for ultra-long life operation, the TS12001 expands the growing ?nanowatt analog?? high- performance analog integrated circuits portfolio. the voltage detector exhibits a preset uvlo threshold voltage of 0.78v (typ) or can be set to other threshold voltages with two external resistors. the comparator exhibits 10mv of internal hysteresis for clean, chatter-free output switching. the TS12001 also offers both push-pull and open-drain outputs. when compared against similar products, the TS12001 offers a factor-of-2 lower power consumption and at least a 33% reduction in pcb area. the TS12001 is fully specified over the -40c to +85c temperature range and is available in a low- profile, 10-pin 2x2mm tdfn package with an exposed back-side paddle. a 0.65v/1a nanopower voltage detector with dual outputs typical application circuit a nanopower 1.8v core system voltage detector
TS12001 page 2 TS12001 rev. 1.0 absolute maximum ratings supply voltage (v in to v ss ) ...................................................+2.75v supply voltage (ov dd to v ss ) ................................................+2.75v input voltage set??????...???????...?.v ss ? 0.3v to v in + 0.3v lhdet package/ordering information order number part marking carrier quantity TS12001itd1022 aan tape & reel ----- TS12001itd1022t tape & reel 3000 lead-free program: silicon labs supplies only lead-free packaging. consult silicon labs for produ cts specified with wider oper ating temperature ranges.
TS12001 TS12001 rev. 1.0 page 3 electrical characteristics v in = ov dd = 0.8v; v ss = 0v; v set = v ss ; v coutpp = hiz; v coutod = hiz; t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c. see note 1. parameter symbol conditions min typ max units supply voltage v in 0.65 2.5 v supply current i in refout = open t a = +25c 0.8 a -40c t a 85c 1 uvlo output driver supply voltage ov dd 0.65 2.5 v output driver supply current i odd 0.1 a preset uvlo trip point v in falling until coutpp switches low 725 761 797 mv v in rising until coutpp switches high 743 781 818 set trip point v set falling until coutpp switches low t a = +25c 540 567 595 -40c t a 85c 534 604 v set rising until coutpp switches high t a = +25c 560 587 615 -40c t a 85c 550 620 set trip response time v set rising 13 s v set falling 10 preset uvlo trip hysteresis 10 mv set enable threshold see note 2 90 mv set input leakage v set = v ss ; v set = v in 20 na lhdet $ $ $ $ $ $ $ $ $ $ input low voltage v il comparator latched output enabled 0.78v v in 1.1v 0.1 v 1.1v < v in 2.5v 0.2 lhdet $ $ $ $ $ $ $ $ $ $ input high voltage v ih comparator latched output disabled 0.78v v in 1.1v v in -0.1 v 1.1v < v in 2.5v 1 lhdet $ $ $ $ $ $ $ $ $ $ input leakage v lhdet $ $ $ $ $ $ $ $ $ $ = v ss ; v lhdet $ $ $ $ $ $ $ $ $ $ = 5.5v 100 na reference output voltage v ref t a = +25c 555 577 600 mv -40c t a 85c 552 602 reference load regulation i out = 100na 0.5 % output high voltage v oh coutpp; i out = -100 a v in ? 0.1 v output low voltage v ol coutpp; i out = 100 a v ss + 0.1 v output low voltage v ol coutod; i out = 100 a v ss + 0.11 v output short- circuit current, i sc sourcing; v coutpp = v ss 0.1 ma sinking; v coutpp = v in 0.5 ma sinking; v coutod = v in 1.4 ma open drain leakage coutod; v coutod = 5v 20 na note 1: all devices are 100% production tested at t a = +25c and are guaranteed by characterization for t a = t min to t max , as specified. note 2: a set voltage above this threshold voltage enables the se t pin voltage to control the comparator output.
TS12001 page 4 TS12001 rev. 1.0 typical performance characteristics v in = ov dd = 2.5v; v ss = 0v; v set = v ss ; v coutpp = hiz; v coutod = hiz, unless otherwise noted. typical values are at t a = +25c. supply voltage - volt supply current - a 1.02 1.39 0.6 0.4 supply current vs supply voltage and temperature 0.65 1.76 0.7 0.8 0.5 2.13 2.5 sink current - ma v ol - v 1 2 0.1 0 0.4 coutpp output voltage low vs sink current 0 3 0.2 0.3 temperature - oc set threshold voltage - v 0.585 0.575 0.6 set threshold voltage vs temperature 0.59 0.595 0.58 source current - ma v in - v oh - v 0.2 0 coutpp output voltage high vs source current 0.3 0.4 0.1 0.5 1 2 0 3 4 temperature - oc reference voltage - v -15 10 0.584 0.582 reference voltage vs temperature -40 35 0.586 60 85 0.588 0.59 0.592 -15 10 -40 35 60 85 0.6 t a = +85oc t a = +25oc t a = -40oc low-to-high high-to-low supply voltage - v short-circuit current - ma 1.5 0.5 coutod short-circuit current vs supply voltage 2 2.5 1 1.11 1.58 0.65 2.04 2.5 v coutod = v in
TS12001 TS12001 rev. 1.0 page 5 coutpp transient response with lhdet 500s/div set 500mv/div typical performance characteristics v in = ov dd = 2.5v; v ss = 0v; v set = v ss ; v coutpp = hiz; v coutod = hiz, unless otherwise noted. typical values are at t a = +25c. lhdet 2v/div coutpp 2v/div coutpp power-up transient response v set = 2.5v, c load = 15pf 100ms/div v in 1v/div output 1v/div supply voltage - v short-circuit current - ma 8 0 coutpp short-circuit current vs supply voltage 12 16 4 1.11 1.58 0.65 2.04 2.5 v coutpp = v ss supply voltage - v short-circuit current - ma 12 0 coutpp short-circuit current vs supply voltage 18 6 1.11 1.58 0.65 2.04 2.5 v coutpp = v in
TS12001 page 6 TS12001 rev. 1.0 pin functions pin name function 1 vin positive supply voltage. connect a 0.1f bypass capacitor from this pin to analog vss/gnd. 2 set external uvlo trip threshold set pin. when this pin is set to vss, the internal preset 0.78v uv lo trip threshold controls the comparator output. when the applied voltage to this pin is higher than 90mv, the set pin sets the trip threshold and controls the comparator output. if the set pin is not used, connect the pin to to vss. 3 nc no connection 4 vss negative supply voltage. 5 lhdet latch enable pin. when lhdet is set low and coutpp is high, coutpp will remain high despite any changes to the input of the comparator. coutpp will once again respond to changes to the input when lhdet is toggled high. if coutpp is initially low and the lhdet is then low, coutpp will stay low. if a low-to-high transition occu rs on coutpp, coutpp will switch to high and stay high and not respond to any changes at the input. the lhdet pin must always be set to a known state. for unlatched comparator operation, set lhdet to high. the open-drain output (coutod) is the inverted version of the coutpp output. 6 refout 0.58v reference output 7 nc no connection 8 coutod comparator open-drain output 9 coutpp comparator push-pull output 10 ovdd output driver positive supply voltage. connect a 0.1f bypass capacitor from this pin to analog vss/gnd. ep ---- exposed paddle is electrically connected to vss/gnd.
TS12001 TS12001 rev. 1.0 page 7 block diagram theory of operation the TS12001 combines a 0.58v 4.5% reference and an analog comparator with a resettable comparator latch in a single package. the TS12001 operates from a single 0.65v to 2.5v power supply and consumes less than 1a total supply current. the TS12001 comparator has a push-pull and open- drain output driver. the push-pull output driver is powered from a separate supply voltage, ov dd . the open-drain output stage allows for easy output voltage level translation as may be required when driving systems powered with a different power supply rail. the analog comparator exhibits 10mv of internal hysteresis for clean, chatter-free output switching. the internal reference was designed to sink or source up to 0.1a load currents. the TS12001 has a preset uvlo threshold voltage of 0.78v (typ) or can be set to other threshold voltages with two external resistors where the divided voltage is applied to the set pin. when the set pin voltage is grounded or it is less than approximately 90mv, the internal preset uvlo threshold circuit will control the comparator outputs. if the set pin is above approximately 90mv, the external voltage divider circuit will control the comparator outputs. the 0.58v reference voltage is tied to the inverting input of the comparator and the output of a switch is connected to the non-inv erting input of the comparator. the output of the switch is either the set voltage or the internal uvlo threshold voltage, depending on whether the set pin voltage is above or below approximately 90mv. if the switch output is above 0.58v, the push-pull output (coutpp) will be high and the open-drain output (coutod) will be low and vice versa. for proper operation, the supply voltage v in must be applied before the output driver supply voltage (ov dd) is applied. the TS12001 has a latch enable pin (lhdet
TS12001 page 8 TS12001 rev. 1.0 allows the output of the comparator to latch to a high state under certain conditions. if lhdet is set high, the coutpp output will switch based on the input to the comparator. when lhdet is set low and coutpp is high, coutpp will remain high until lhdet goes high. if coutpp is initially low instead, coutpp will rema in low until a low-to- high transition occurs on the coutpp output. after this event, coutpp will remain high and be unresponsive to any changes at the input of the comparator until lhdet goes high. in essence, the lhdet pin offers a low-to-high detection. however, lhdet must not be left open. the open- drain output, coutod, is the inverter version of the coutpp output. connect lhdet to v in for normal operation or to v ss for lhdet enable. if the set pin is not used, it cannot be left unconnected and should be tied to v ss . comparator the TS12001 has an internal comparator that can eliminate supply glitches that commonly occur when output transitions occur. in addition, the input exhibits 10mv of internal hysteresis in order to insure clean output switching behavior. the outputs can swing to within 100mv of the supply rails. the coutpp output can source and sink 0.1ma and 0.5ma of current. the coutd outputs can sink 1.4ma of current with v coutod = 0.78v internal reference the TS12001?s on-board 0.58v 4.5% reference voltage can source and sink 0.1a and 0.1a of current and can drive a capacitive load less than 50pf and greater than 50nf with a maximum capacitive load of 250nf. the higher the capacitive load, the lower the noise on the reference voltage and the longer the time needed for the reference voltage to respond and become available on the refout pin. with a 250nf capacitive load, the response time is approximately 20ms. while also available as a separate pin as refout, the reference is tied internally to the inverting input of the comparator. applications information external voltage detector design depending on the battery voltage used and the voltage one wishes to detect, the TS12001 can be designed accordingly. as shown in figure 1, r1 and r2 can be selected based on the desired voltage to detect. table 1. provides r1 and r2 resistor combinations for detecting various v in voltages. v in threshold voltage(v) r1(m ? ) r2(m ? ) 0.9 2.2 4.02 1.07 3.32 4.02 1.28 4.75 4.02 1.52 6.49 4.02 1.85 8.66 4.02 table 1. resistor combinations for several v in threshold voltages the design equation for this circuit is shown below. the set pin voltage (v set ) that will cause a high-to-low transition on the output is approximately 580mv. to design the circuit, r1 or r2 can be selected along with the desired battery voltage to detect. then, the second resistor value can be evaluated using the voltage divider equation below. r1= v in x r2 \ v set x r2 v set a nanopower 1.8v core system voltage detector when power supply rails sag in any system, it is important to alert the cpu. a cpu can be used to detect when i/o or core system voltages sag below a prescribed threshold as shown figure 2. in this circuit, a 1.8v core system voltage detector is designed around the TS12001 providing a low battery detect signal. r1 and r2 were selected to set a set voltage at 582mv so that when vcore drops below 1.77v, the TS12001 output transitions to low. it is recommended to use 1% resistors for optimal accuracy. the circuit consumes approximately 0.75a of current when vcore = 1.8v. pc board layout and power-supply bypassing while power-supply bypass capacitors are not typically required, it is good engineering practice to use 0.1uf bypass capacitors close to the device?s
TS12001 TS12001 rev. 1.0 page 9 power supply pins. when the power supply impedance is high, the power supply leads are long, or there is excessive noise on the power supply traces. to reduce stray capacitance, it is also good engineering practice to make signal trace lengths as short as possible. also recommended are a ground plane and surface mount resistors and capacitors. input noise radiated noise is common in low power circuits that require high impedance circuits. to minimize this effect, all traces between any of the inputs and passive component networks should be made as short as possible. figure 2. a nanopower 1.8v core system voltage detector circuit figure 1. external voltage detector design circuit
TS12001 silicon laboratories, inc. page 10 400 west cesar chavez, austin, tx 78701 TS12001 rev. 1.0 +1 (512) 416-8500 ? www.silabs.com package outline drawing patent notice silicon labs invests in research and development to help our custom ers differentiate in the market with innovative low-power, s mall size, analog-intensive mixed-signal solutions. s ilicon labs' extensive patent portfolio is a testament to our unique approach and wor ld-class engineering team. the information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and om issions, and disclaims responsib ility for any consequences resu lting from the use of information included herein. additionally, silicon laborat ories assumes no responsibility for the functioning of undescr ibed features or parameters. silicon laboratories reserves the right to make c hanges without further notice. silicon laboratories makes no warra nty, representation or guarantee regarding the suitability of its pr oducts for any particular purpose, nor does silicon laboratories assume any liability arising out of the application or use of any product or circ uit, and specifically disclaims any and all liability, in cluding without limitation consequential or incidental damages. silicon laboratories products are not designed, intended, or authorized for use in applica tions intended to support or sustain life, or for any other application in wh ich the failure of the silicon laboratories product could create a situation where personal injury or death may occur. should buyer purchase or use silicon laboratories products for any such unintended or unaut horized application, buyer shall indemnify and hold silicon laboratories harmless against all claims and damages. silicon laboratories and silicon labs are tr ademarks of silicon laboratories inc. other p roducts or brandnames mentioned herein are trademarks or re g istered trademarks of their res p ective holders. 10-pin tdfn22 package outline drawing (n.b., drawings are not to scale)
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