? semiconductor components industries, llc, 2014 june, 2014 ? rev. 3 1 publication order number: NCS2302/d NCS2302 headset detection interface with send/end detect the NCS2302 is a compact and cost effective headset detection interface ic. it integrates several circuit blocks to detect the presence of a stereo headset with a microphone and whether the send/end button has been pressed. the nmos transistor on the mic pin mutes the signal when the headset is not present. the built in resistor divider provides the reference voltage for detecting the left audio channel. when l_det and gnd_det are pulled low, the logic low output of the or gate indicates the headset has been connected properly and the mic pull?down is disabled. a comparator is integrated for detecting the send/end button press. the NCS2302 comes in a space?saving uqfn10 package (1.4 x 1.8 mm). features ? wide supply voltage ranges: for headset detection circuit: v dd = 1.6 v to 2.5 v for s/e comparator circuit: v dd2 = 1.6 v to 2.8 v ? low quiescent supply current: 17 a typical ? low impedance mic pull?down reduces pop & click noise: r ds(on) = 0.45 typical ? space saving uqfn10 package ? these devices are pb?free, halogen free/bfr free and are rohs compliant typical applications ? cell phones, smartphones ? tablets ? notebooks uqfn10 mu suffix case 488at http://onsemi.com marking diagram device package shipping ? ordering information NCS2302mutag uqfn10 (pb?free) 3000 / tape & reel pin diagram ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specification brochure, brd8011/d. top view 1 aq = specific device code m = date code = pb?free package (note: microdot may be in either location) aqm 8 9 10 1 gnd mic gnd_det det vdd l_det 5 4 3 2 s/e s/e_det 7 6 s/e_ref vdd2
NCS2302 http://onsemi.com 2 figure 1. simplified application schematic gnd gnd_det det vdd l_det 3 s/e s/e_det s/e_ref vdd 2 NCS2302 mic vdd 4 5 2 1 10 9 8 7 6 mic gnd r l l_det gnd_det 2.2 k vdd2 vdd 2 m g r l audio codec mic bias voltage mic output to speakers baseband processor gpio gpio s/e detection figure 2. block diagram NCS2302 270k 1m vdd ? l_det vdd gnd_det mic det 6 5 4 2 3 1 vdd gnd vdd vdd 1m 1m vdd vdd + + ? 8 7 s/e s/e_det 9 s/e_ref 10 vdd2
NCS2302 http://onsemi.com 3 table 1. output logic inputs outputs headset l_detect gnd_detect det mic 0 0 0 1 (external pull?up) detected 0 1 1 0 not detected 1 0 1 0 1 1 1 0 table 2. pin description pin name type description 1 gnd power connects to system ground. 2 mic output the open drain mic pin is connected to the audio jack mic pin. the mic pin will pull low when the headset is not connected. when the headset is detected, the internal pull?down is dis- abled and the external pull?up biases the microphone. 3 vdd power supply voltage pin for headset detection circuit. a bypass capacitor of 0.1 f is recommended as close as possible to this pin. 4 l_det input connect to audio jack l_det. this pin is pulled low when the headset is present. 5 gnd_det input connect to audio jack gnd_det. this pin is pulled low when the headset is present. 6 det output indicates whether headset has been detected. headset is detected when det is low. 7 s/e output indicates whether send/end button press has been detected. button press is detected when s/e is low. 8 s/e_det input non?inverting input of the comparator detects whether the send/end button has been pressed. 9 s/e_ref input inverting input of the comparator sets a voltage reference with an external resistor divider 10 vdd2 power supply voltage pin for s/e detection comparator. a bypass capacitor of 0.1 f is recommen- ded as close as possible to this pin. table 3. absolute maximum ratings (note 1) rating symbol value unit supply voltage range of headset detection circuit v dd 0 to 2.75 v supply voltage range of s/e detection comparator v dd2 0 to 2.95 v input pin voltage range (l_det, gnd_det) v in ?0.1 to v dd + 0.1 v input pin voltage range (s/e_ref, s/e_det) (note 4) v in ?0.1 to min(v dd2 + 0.6, 3.3) v mic output pin voltage range v mic 0 to 6.0 v max current on mic pin i mic 2 ma maximum junction temperature t j(max) +125 c storage temperature range t stg ?65 to +150 c latch?up current (note 2) i lu 800 ma moisture sensitivity level (note 3) msl level 1 stresses exceeding those listed in the maximum ratings table may damage the device. if any of these limits are exceeded, device function ality should not be assumed, damage may occur and reliability may be affected. 1. refer to electrical characteristics and application information for safe operating area. 2. latch?up current tested per jedec standard: jesd78 3. moisture sensitivity level tested per ipc/jedec standard: j?std?020a 4. the maximum voltage on the s/e_ref and s/e_det pins must be the lesser of v dd2 + 0.6 and 3.3 v.
NCS2302 http://onsemi.com 4 table 4. recommended operating ranges rating conditions symbol min typ max unit power supply voltage headset detection circuit v dd 1.6 1.8 2.5 v s/e detection comparator v dd2 1.6 2.8 v input voltage l_det, gnd_det v in 0 v dd v s/e_det, s/e_ref 0 v dd2 v input transition rise or fall rate gnd_det pin t / v 0 10 ns/v mic bias voltage v mic 0 2.95 v ambient temperature t a ?40 85 c junction temperature t j ?40 125 c functional operation above the stresses listed in the recommended operating ranges is not implied. extended exposure to stresse s beyond the recommended operating ranges limits may affect device reliability. table 5. electrical characteristics typical values are referenced to t a = 25 c, v dd = 1.8 v, v dd2 = 2.1 v, unless otherwise noted. min/max values apply from t a = ?40 c to 85 c, unless otherwise noted. (notes 5, 6) parameter test conditions symbol min typ max units supply characteristics quiescent supply current headset detection circuit, v gnd_det = 1.8 v, v l_det = 1.8 v i dd 7 8.5 a s/e detection comparator, v se_ref = 0 v, v se_det = 2.1 v i dd2 10 12.5 a input characteristics of l_det voltage input low v il 1.33 v voltage input high v ih 1.5 v propagation delay to det c out = 15 pf, gnd_det = 0 v, l_det = 1.31 v to 1.52 v t plh, t phl 45 ns low to high propagation delay to mic c out = 15 pf, gnd_det = 0 v, l_det = 1.31 v to 1.52 v, r pu = 2.2 k , mic bias = 2.3 v t plh 230 ns high to low propagation delay to mic c out = 15 pf, gnd_det = 0 v, l_det = 1.31 v to 1.52 v, r pu = 2.2 k , mic bias = 2.3 v t phl 30 ns low voltage input bias current v l_det = 0 v i il 1.8 a high voltage input leakage v l_det = 1.8 v i ih 2.4 na input capacitance f = 1 mhz c in 3 pf input characteristics of gnd_det voltage input low v il 0.63 v voltage input high v ih 1.17 v low to high propagation delay to det c out = 15 pf, r l = 1 m , l_detect = 0 v, gnd_detect = 1.8 to 0 v t plh 30 ns high to low propagation delay to det c out = 15 pf, r l = 1 m , l_detect = 0 v, gnd_detect = 0 to 1.8 v t phl 16 ns low voltage input bias current v gnd_detect = 0 v i il 1.8 a high voltage input leakage v gnd_detect = 1.8 v i ih 2.7 na input capacitance f = 1 mhz c in 3 pf 5. refer to absolute maximum ratings and application information for safe operating area. 6. performance guaranteed over the indicated operating temperature range by design and/or characterization.
NCS2302 http://onsemi.com 5 table 5. electrical characteristics typical values are referenced to t a = 25 c, v dd = 1.8 v, v dd2 = 2.1 v, unless otherwise noted. min/max values apply from t a = ?40 c to 85 c, unless otherwise noted. (notes 5, 6) parameter units max typ min symbol test conditions output characteristics of det voltage output low i oh = 0.1 ma v ol 0.1 v voltage output high i oh = ?0.1 ma v oh 1.6 v rise time c out = 15 pf, r l = 1 m t rise 50 ns fall time c out = 15 pf, r l = 1 m t fall 28 ns input characteristics of s/e_ref and s/e_det propagation delay to s/e c out = 15 pf, v cm = mid?supply, 100 mv overdrive t plh, t phl 50 ns input leakage v cm = 0.9 v i il 150 pa input capacitance s/e_det, f = 1 mhz c in 3 pf s/e_ref, f = 1 mhz 11 output characteristics of s/e voltage output low i oh = 0.1 ma v ol 0.1 v voltage output high i oh = ?0.1 ma v oh 1.9 v rise time c out = 15 pf, r l = 1 m t rise 30 ns fall time c out = 15 pf, r l = 1 m t fall 18 ns characteristics of mic drain?source on resistance of nmos i mic = 1 ma r ds(on) 0.45 1.2 5. refer to absolute maximum ratings and application information for safe operating area. 6. performance guaranteed over the indicated operating temperature range by design and/or characterization. product parametric performance is indicated in the electrical characteristics for the listed test conditions, unless otherwise noted. product performance may not be indicated by the electrical characteristics if operated under different conditions. typical characteristics figure 3. mic on resistance vs. drain current at v dd = 1.6 v figure 4. mic on resistance vs. drain current at v dd = 1.8 v mic drain current (ma) mic drain current (ma) 4.5 4.0 3.5 3.0 2.0 1.5 1.0 0.5 0.2 0.3 0.4 0.5 0.6 0.7 0.8 5.0 4.0 3.5 3.0 2.0 1.5 1.0 0.5 0.2 0.3 0.4 0.5 0.6 0.7 0.8 mic r ds(on) resistance ( ) mic r ds(on) resistance ( ) 2.5 5.0 v dd = 1.6 v t = ?40 c t = 25 c t = 85 c v dd = 1.8 v t = ?40 c t = 25 c t = 85 c 2.5 4.5
NCS2302 http://onsemi.com 6 typical characteristics figure 5. mic on resistance vs. drain current at v dd = 2.0 v figure 6. low to high propagation to det with changing input overdrive of l_det propagation delay (ns) 500 400 300 200 100 0 ?100 0.7 0.8 0.9 1.1 1.2 1.3 1.5 1.6 figure 7. high to low propagation to det with changing input overdrive of l_det figure 8. low to high propagation to se with changing input overdrive of se_det input voltage (v) mic drain current (ma) 4.0 3.5 3.0 2.0 1.5 1.0 0.5 0.2 0.3 0.4 0.5 0.6 0.7 0.8 mic r ds(on) resistance ( ) v dd = 2.0 v t = ?40 c t = 25 c t = 85 c 2.5 4.5 5.0 1.0 1.4 input output 100 mv 50 mv 20 mv 10 mv v dd = 1.8 v v dd2 = 2.1 v r l = 1 m c l = 15 pf t a = 25 c propagation delay (ns) 500 400 300 200 100 0 ?100 0.7 0.8 0.9 1.1 1.2 1.3 1.5 1.6 input voltage (v) 1.0 1.4 input output 100 mv 50 mv 20 mv 10 mv v dd = 1.8 v v dd2 = 2.1 v r l = 1 m c l = 15 pf t a = 25 c ?0.5 0 0.5 1.5 2.0 2.5 3.5 4.0 1.0 3.0 output voltage (v) ?0.5 0 0.5 1.5 2.0 2.5 3.5 4.0 1.0 3.0 output voltage (v) propagation delay (ns) 500 400 300 200 100 0 ?100 ?0.1 0 0.1 0.3 0.4 0.5 0.7 0.8 input voltage (v) 0.2 0.6 input output 100 mv 50 mv 20 mv 10 mv v dd = 1.8 v v dd2 = 2.1 v r l = 1 m c l = 15 pf t a = 25 c ?0.5 0 0.5 1.5 2.0 2.5 3.5 1.0 3.0 output voltage (v) 4.0
NCS2302 http://onsemi.com 7 typical characteristics figure 9. high to low propagation to se with changing input overdrive of se_det propagation delay (ns) 700 400 300 200 100 0 ?100 ?0.1 0 0.1 0.3 0.4 0.5 0.7 0.8 input voltage (v) 0.2 0.6 input output 100 mv 50 mv 20 mv 10 mv v dd = 1.8 v v dd2 = 2.1 v r l = 1 m c l = 15 pf t a = 25 c ?0.5 0 0.5 1.5 2.0 2.5 3.5 4.0 1.0 3.0 output voltage (v) 500 600 applications information supply voltages the NCS2302 works with a wide range of supply voltages. the main headset detection circuitry power supply can range from v dd = 1.6 v to 2.5 v. the send/end button press detection circuit can be powered from v dd2 = 1.6 to 2.8 v. v dd should be powered up before v dd2 . the send/end detection comparator will not be functional unless v dd and v dd2 are both applied. v dd2 can be connected to v dd or to a separate supply voltage, such as the mic bias voltage. decoupling capacitors of 0.1 f should be placed as close as possible to each power supply pin. since the NCS2302 has built in latch?up immunity up to 800 ma, series resistors are not recommended on vdd or vdd2. audio jack detection the NCS2302 is designed to simplify the detection of a stereo audio connector with a microphone contact. when the headset is not connected, the internal pull?up resistors on l_det and gnd_det pull those pins high. when the headset is connected to the switched audio jack, the headset ground and left audio channel trigger l_det and gnd_det to logic low. the NCS2302 can work with either the ctia or omtp standard. in order to support both standards simultaneously, a cross point switch and additional circuitry is necessary to detect and swap the ground and microphone pins. send/end button press detection a second integrated comparator allows the send/end signal to be compared with a reference voltage to detect whether the send/end button has been pressed. mic pin biasing the typical application schematic in figure 1 shows the recommended 2.2 k pull?up resistor to the mic bias voltage. the mic bias voltage can exceed v dd and can go as high as 2.95 v. when the headset is not detected, the internal nmos transistor is enabled to mute the mic signal. in the typical application scenario with a 2.2 k pull?up to a 2.1 v mic bias voltage, the mic pin is pulled to 1 mv when the headset is not present. the internal nmos transistor is optimized to sink up to 2 ma of current, allowing some flexibility in the selection of the pull?up resistor and mic bias voltage.
NCS2302 http://onsemi.com 8 package dimensions uqfn10 1.4x1.8, 0.4p case 488at issue a a b a1 0.05 c seating plane note 3 notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: millimeters 3. dimension b applies to plated terminal and is measured between 0.25 and 0.30 mm from terminal. 4. coplanarity applies to the exposed pad as well as the terminals. dim min max millimeters a 1.40 bsc a1 0.40 bsc 0.45 0.60 b d 0.30 0.50 e e l l1 0.00 0.05 pin 1 reference d a e b 0.10 c 2x 0.10 c 2x 0.05 c c l3 10 1 3 5 6 0.05 c 0.10 ca b 10 x e e/2 l 9 x 0.00 0.15 1.80 bsc 0.15 0.25 mounting footprint 10 x pitch 1 9 x scale 20:1 0.663 0.0261 0.200 0.0079 0.400 0.0157 0.225 0.0089 2.100 0.0827 1.700 0.0669 0.563 0.0221 mm inches 10x l1 detail a bottom view (optional) l3 0.40 0.60 0.127 ref a3 top view side view bottom view on semiconductor and are registered trademarks of semiconductor co mponents industries, llc (scillc). scillc owns the rights to a numb er of patents, trademarks, copyrights, trade secrets, and other inte llectual property. a listing of scillc?s pr oduct/patent coverage may be accessed at ww w.onsemi.com/site/pdf/patent?marking.pdf. scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and s pecifically disclaims any and all liability, including without limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/ or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typical s? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the right s of others. scillc products are not designed, intended, or a uthorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in whic h the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or us e scillc products for any such unintended or unauthorized appli cation, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unin tended or unauthorized use, even if such claim alleges that scil lc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyrig ht laws and is not for resale in any manner. p ublication ordering information n. american technical support : 800?282?9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81?3?5817?1050 NCS2302/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303?675?2175 or 800?344?3860 toll free usa/canada fax : 303?675?2176 or 800?344?3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your loc al sales representative
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