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_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. max14579e/max14579ae low-power headset detectors with send/end button support 19-5964; rev 0; 06/11 general description the max14579e/max14579ae provide a simple solution for detecting the insertion and managing the operation of a 3.5mm stereo headset with a microphone. these devices integrate all circuitry required to detect send/ end button press events and generate required micro - phone bias voltages. the devices are managed with only three gpios from the host controller to select between call mode and standby mode, and monitor the send/end and jack insertion status. in call mode, the low-noise ldo is enabled to provide dc bias to the externally preamplified micro - phone. in standby mode, microphone low-power pulsing is enabled to reduce supply current while waiting for a send/end button press event. two open-drain outputs signal the host controller when an insertion/removal or send/end button press event occurs. the max14579e/max14579ae manage jack insertion detection by monitoring a 3.5mm socket with a normally open jack insertion switch. the devices are available in an 8-pin tdfn package, and are fully specified over the -40 n c to +85 n c extended temperature range. features s 3.5mm jack insertion detection s simple interface: one input/two open-drain outputs s low-power microphone mode s low-noise, high-psrr microphone bias generator s click-and-pop suppression s high-esd protection on mic and detin inputs 15kv human body model (hbm) applications cell phones e-readers tablet pcs ordering information typical operating circuit + denotes a lead(pb)-free/rohs compliant package. * ep = exposed pad. ** future productcontact factory for availablity. evaluation kit available max14579e 1m 2.2k 10k mode cap res detin mic adc swd processor audio amplifier microphone amplifier 3.3v 3.3v 3.5mm socket 1f 0.22f 0.1f 1m det ep/gnd v cc 3.3v part temp range pin-package max14579e eta+ -40 n c to +85 n c 8 tdfn-ep* max14579ae eta+** -40 n c to +85 n c 8 tdfn-ep*
2 ______________________________________________________________________________________ max14579e/max14579ae low-power headset detectors with send/end button support stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (voltages referenced to ground.) v cc , mode, swd, det .......................................... -0.3v to +6v cap, mic, detin, res ............................ -0.3v to (v cc + 0.3v) continuous current into any terminal .......................... q 100ma continuous power dissipation (t a = +70 n c) tdfn (derate 11.9mw/ n c above +70 n c) ................. 953.5mw operating temperature range .......................... -40 n c to +85 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ............................... +300 n c soldering temperature (reflow) ...................................... +260 n c tdfn junction-to-ambient thermal resistance ( b ja ) ........ 83.9 n c/w junction-to-case thermal resistance ( b jc ) ................ 37 n c/w electrical characteristics (v cc = 2.5v to 5.5v, c detin < 100pf, t a = -40 n c to +85 n c, unless otherwise noted. typical values are at v cc = 3.6v, t a = +25 n c.) (note 2) absolute maximum ratings package thermal characteristics (note 1) note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . parameter symbol conditions min typ max units dc characteristics supply voltage range v cc 2.5 5.5 v v cc undervoltage-lockout threshold v ccuvlo v cc rising 0.9 1.7 2.45 v v cc supply current i cc v cc = 2.8v mode = low, detin = high 0.8 1.3 f a mode = low, detin = low, i mic = 300 f a 8 11 mode = high, detin = low, i mic = 300 f a 500 800 detin pullup resistance r detin 1000 k i internal microphone bias voltage v bias mode = low v cc v mode = high, detin = low 2.2 mic send/end detection threshold 0.20 o v bias 0.22 o v bias 0.24 o v bias v detin detection threshold falling edge 1/3 o v cc 1/2 o v cc 2/3 o v cc v
_______________________________________________________________________________________ 3 max14579e/max14579ae low-power headset detectors with send/end button support electrical characteristics (continued) (v cc = 2.5v to 5.5v, c detin < 100pf, t a = -40 n c to +85 n c, unless otherwise noted. typical values are at v cc = 3.6v, t a = +25 n c.) (note 2) note 2: all units are production tested at t a = +25 n c. specifications over temperature are guaranteed by design. parameter symbol conditions min typ max units linear regulator (cap) minimum bypass capacitance c out 0.22 f f output current limit i cap v cap < v ldo 4 ma output voltage v ldo v cc = 2.8v 2.0 2.2 2.45 v ldo psrr psrr ldo noise from v cc to cap, f = 217hz, v cc = 2.8v q 0.1v, i cap = 300 f a, mode = high 100 db ldo noise n ldo v cc = 2.8v, i mic = 300 f a, f = 100hz to 4000hz 11 f v rms ldo turn-off time t off v cc = 2.8v, r l = 2k i , v cap from 90% to 10% 120 f s digital signals (mode, swd, det) input-voltage high v ih 1.4 v input-voltage low v il 0.4 v input leakage current i inleak -1 +1 f a output logic-high leakage current (open drain) i oh_lkg output voltage = 5v 1 f a output logic-low v ol i sink = 1ma 0.4 v dynamic characteristics mic low-power mode on-time t miclpo r mic = 5k i , mplp 120 f s mic low-power mode period t miclpp r mic = 5k i , mplp 8 ms detin debounce time t detindeb falling edge max14579e 300 ms max14579ae 1000 send/end debounce time t sedeb 28 ms esd protection mic, detin human body model q 15 kv all other pins human body model q 2 kv
4 ______________________________________________________________________________________ max14579e/max14579ae low-power headset detectors with send/end button support typical operating characteristics (max14579e, v cc = 3.3v, t a = +25 n c, c detin < 100pf, unless otherwise noted.) cap voltage vs. temperature max14579e toc06 t a (c) v cap (v) 60 35 10 -15 0.5 1.0 1.5 2.0 2.5 3.0 0 -40 85 v cc = 2.8v i cap = 0ma cap voltage vs. current max14579e toc05 i cap (ma) v cap (v) 6 5 4 3 2 1 0.5 1.0 1.5 2.0 2.5 3.0 0 0 7 v cc = 3.3v cap voltage vs. v cc max14579e toc04 v cc (v) v cap (v) 4.5 3.5 0.5 1.0 1.5 2.0 2.5 3.0 0 2.5 5.5 i cap = 0ma v cc supply current vs. voltage max14579e toc03 v cc (v) i cc (a) 4.5 3.5 80 100 120 140 160 180 200 60 2.5 5.5 call mode i mic = 0a t a = -40c t a = +25c t a = +85c v cc supply current vs. voltage max14579e toc02 v cc (v) i cc (a) 4.5 3.5 2 4 6 8 10 12 0 2.5 5.5 mplp mode i mic = 0a t a = -40c t a = +25c t a = +85c v cc supply current vs. voltage max14579e toc01 v cc (v) i cc (a) 4.5 3.5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 2.5 5.5 shutdown mode t a = -40c t a = +25c t a = +85c
_______________________________________________________________________________________ 5 max14579e/max14579ae low-power headset detectors with send/end button support typical operating characteristics (continued) (max14579e, v cc = 3.3v, t a = +25 n c, c detin < 100pf, unless otherwise noted.) swd debounce timing max14579e toc12 40ms/div 3.3v 3.3v 0v 0v v mic 1v/div v swd 2v/div detin debounce timing (mode = low) max14579e toc11 100ms/div 3.3v 3.3v 0v 0v v detin 1v/div v res 2v/div microphone low-power mode operation max14579e toc10 1ms/div 3.3v 0v v mic 1v/div cap noise density vs. frequency max14579e toc09 frequency (hz) noise spectral density (v/hz) 1000 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 100 10,000 cap power-supply rejection ratio vs. frequency max14579e toc08 frequency (hz) psrr to cap (db) 10,000 1000 100 -100 -80 -60 -40 -20 0 -120 10 100,000 v cc = 2.8v 0.1v cap dropout voltage vs. cap current max14579e toc07 i cap (ma) dropout voltage (mv) 6 5 4 3 2 1 500 1000 1500 2000 2500 0 0 7 t a = -40c t a = +25c t a = +85c
6 ______________________________________________________________________________________ max14579e/max14579ae low-power headset detectors with send/end button support pin configuration pin description tdfn top view *ep/gnd *connect the exposed pad (ep/gnd) to the ground plane. max14579e max14579ae 1 + 8 mic res 2 7 detin mode 4 5 cap det 3 6 v cc swd pin name function 1 res resistor connection. connect an external 2.2k i resistor from res to mic for microphone biasing. 2 mode microphone mode control input. mode selects the operating mode. see the mode control input section for more information. 3 swd send/end button detection output. swd asserts when a send/end button press event occurs. swd is an active-low, open-drain output. 4 det jack insertion detection open-drain output. det is asserted when there is a 3.5mm jack inserted into the socket. det is an active-low output. 5 cap internal ldo output. connect a 0.22 f f ceramic (x5r, x7r, or better) capacitor between cap and ground. 6 v cc supply voltage. bypass v cc to ground with a 1 f f ceramic capacitor. 7 detin jack insertion detection input. an internal comparator monitors detin for jack insertion/ removal events. 8 mic microphone connection. during audio operation, a 2.2v bias voltage is supplied to mic through res. an internal comparator monitors mic for send/end button press events. ep exposed pad. the exposed pad is the ground connection for the device. connect ep/gnd to the ground plane.
_______________________________________________________________________________________ 7 max14579e/max14579ae low-power headset detectors with send/end button support functional diagram detailed description the max14579e/max14579ae manage headsets by integrating 3.5mm jack insertion detection, microphone bias generation, and send/end button press detection. these devices feature a low-power microphone mode to reduce the high bias current required for microphone operation while it is not in use. the devices require only a single mode input to select between call mode and low-power mode. see the jack insertion detection sec - tion for details about the differences among the devices. internal ldo regulator the devices feature an internal low-noise, low-dropout regulator (ldo) for biasing the microphone connected to mic. the ldos output voltage is set at 2.2v. the ldo is enabled and enters low-noise mode when the mode input is logic-high and a jack is detected. pull the mode input low to put the ldo in low-power shutdown mode. microphone operation and bias voltage generation an externally preamplified microphone is connected to mic. connect mic to res through an external 2.2k i resistor to bias the microphone. all the devices generate a bias voltage (v bias ) at res. v bias is generated either by the internal 2.2v (typ) ldo when the mode input is logic-high or by v cc when the mode input is logic-low. microphone low-power mode (mplp) a microphone draws a large amount of current due to the required bias resistor when it is connected. this current is dissipated even while the microphone is not in use. the ics feature internal circuitry to reduce this current while simultaneously detecting send/end button press events. max14579e max14579ae low-noise 2.2v ldo debounce debounce lm control v bias v cc mode cap res mic detin 0.22v bias swd v cc 0.5v cc det
8 ______________________________________________________________________________________ max14579e/max14579ae low-power headset detectors with send/end button support when microphone low-power mode (mplp) is entered by pulling the mode input low, the bias voltage is dis - connected from the res output and is reconnected for a short duration every 8ms (typ) to check for a send/end button press event. mplp is exited when the mode input transitions to logic-high. note that v bias is permanently disconnected from res when no jack is inserted and microphone low-power mode is not entered. jack insertion detection the max14579e/max14579ae detect jack insertion/ removal events by monitoring the detin input. debounce circuitry ensures that transient voltages do not force the device to enter or exit mplp due to false jack insertion/ removal detection. max14579e detection the max14579e/max14579aes' detin input has an internal 1m i pullup resistor to v cc . detin monitors a normally open insertion detection switch connected between detin and an audio line. detin is pulled high by the resistor, and det is logic-high when no jack is inserted into the socket. detin is pulled low by the switch, and det is logic-low when a jack is inserted. ensure that the total capacitance on detin is less than 100pf. send/end button press detection the max14579e/max14579ae detect send/end but - ton press events by monitoring the mic input. a send/ end button press is detected if the voltage at mic falls below the mic send/end detection threshold (0.22 o v bias (typ)) for longer than the debounce time (typ). the swd output is logic-low for the duration of the send/ end button press event following the debounce period. the send/end detection circuitry is active whenever a jack is inserted. the debounce period built into the send/end button press detection allows the mechanical send/end but - ton to reach steady-state before applying the micro - phone bias. this mitigates click-and-pop noise. mode control input an external host processor controls the mode input. table 1 shows the behavior of the device based on the mode input and jack insertion status. the device enters call mode when mode is logic-high and a jack is detected, enabling the ldo immediately in low-noise mode (lnm). the 2.2v (typ) ldo output powers v bias and is connected to the microphone through an external 2.2k i bias resistor. pull mode low to put the device in standby mode. in standby mode, v cc powers v bias , the ldo enters shut - down mode (sdm), and the microphone bias connection either turns off permanently if no jack is inserted or enters mplp if a jack is inserted. the mode input is compatible with 1.8v logic with v cc voltages up to 5.5v. applications information typical connections for 3.5mm jacks there are two typical 3.5mm jacks: tip-ring-ring-sleeve (trrs) with four conductors (figure 1a) and tip-ring- sleeve (trs) with three conductors (figure 1b). the most common configuration of the trrs jack is to use rings 1 and 2 for audio signals, ring 3 for ground, and ring 4 for a microphone. the trs jack typically uses rings 1 and 2 for audio signals and rings 3 and 4 as ground. table 1. operating modes figure 1. typical 3.5mm jacks 1 2 (a) 3 4 (b) 1 2 3 4 mode low high detin/mic inserted low high low high ldo mode sdm sdm mic bias mode mplp off 2.2k i off
_______________________________________________________________________________________ 9 max14579e/max14579ae low-power headset detectors with send/end button support supported accessories the devices support all standard configurations of headsets with a microphone and send/end button on a trs or trrs 3.5mm jack. figure 2 shows the supported connections of the speakers, send/end button, and microphone to the jack. headset with no microphone when the 3.5mm jack in figure 2a is inserted, the mic input is pulled low permanently by the ground con - nection on the sleeve and the swd output is logic-low permanently. this type of headset is supported by imple - menting a timeout period in software to recognize that the permanent logic-low is not due to a very long send/ end button press event. headset with microphone and normally open send/end button in parallel when the 3.5mm jack in figure 2b is inserted, the mic input is pulled below the threshold only during a send/ end button press event. the swd output is logic-high when the send/end button is pressed for more than the debounce time. headset with normally open send/end button and resistive remote control the devices support the 3.5mm jack with a microphone and two buttons in figure 2c that is the standard windows mobile? configuration. the threshold is set to detect a button press, regardless of which button is pressed. high-esd protection electrostatic discharge (esd)-protection structures are incorporated on all pins to protect against electrostatic discharges up to q 2kv human body model (hbm) encountered during handling and assembly. detin and mic are further protected against esd up to q 15kv (hbm) without damage. after an esd event, all the devices continue to function without latchup. figure 2. supported 3.5mm accessory configurations windows mobile is a registered trademark of microsoft corporation. (a) speaker 1 2 3 4 speaker (b) speaker microphone send/ end 1 2 3 4 speaker (c) speaker microphone 1 2 3 4 speaker send/ end 600 200
10 _____________________________________________________________________________________ max14579e/max14579ae low-power headset detectors with send/end button support esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test methodology, and results. human body model figure 3 shows the human body model. figure 4 shows the current waveform it generates when discharged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of interest that is then discharged into the device through a 1.5k i resistor. chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. figure 3. human body esd test model figure 4. human body current waveform charge-current limit resistor discharge resistance storage capacitor c s 100pf r c 1m r d 1.5k high- voltage dc source device under test i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amps package type package code outline no. land pattern no. 8 tdfn-ep t822+2 21-0168 90-0065
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 11 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. max14579e/max14579ae low-power headset detectors with send/end button support revision history revision number revision date description pages changed 0 6/11 initial release

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