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version: 0 . 0 0 release date: 2014 - 01 - 08 ? 2010 - 2014 mediatek inc. this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. specifications are subject to change without notice. mt 7681 802.11 b/g/n single chip preliminary datasheet m e d i
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 2 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. document revision history revision date author description 0.0 0 2014/01 / 08 alex lin f irst formal release
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 3 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. table of contents document revision history ................................ ................................ ................................ .................. 2 table of contents ................................ ................................ ................................ ................................ ... 3 1 system overvie w ................................ ................................ ................................ .......................... 4 1.1 general descriptions ................................ ................................ ................................ ......... 4 1.2 features ................................ ................................ ................................ ............................... 4 1.3 applications ................................ ................................ ................................ ........................ 5 1.4 block diagram ................................ ................................ ................................ .................... 5 2 product descriptions ................................ ................................ ................................ ................... 6 2.1 pin layout ................................ ................................ ................................ ........................... 6 2.2 pin descriptio n ................................ ................................ ................................ ................... 7 2.3 strapping option ................................ ................................ ................................ ................... 9 2.4 package information ................................ ................................ ................................ ........... 10 2.4.1 qfn packaging ................................ ................................ ................................ . 10 2.5 ordering information ................................ ................................ ................................ ........ 12 3 electrical characteristics ................................ ................................ ................................ ........... 13 3.1 absolute maximum rating ................................ ................................ ................................ ... 13 3.2 recommended operating range ................................ ................................ ......................... 13 3.3 dc characteristics ................................ ................................ ................................ .............. 13 3.4 thermal characteristics ................................ ................................ ................................ ...... 13 3.5 current consumption ................................ ................................ ................................ .......... 14 me dia tek co nfid enti al a
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 4 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 1 system overview 1.1 g eneral descriptions the mt76 8 1 is a highly integrated wi - fi soc( system on chip) single chip , which support s ieee802.11b/g/n single stream, providing gpio and pwm for intelligent control , and uart, spi, and i2c interfaces for device communication. the MT7681 integrate power amplifier, low noise amplifier, and rf switch to reduce the module size and rf design capability required . a nd also integrate power manage unit for single 3.3v power source for cost effective design . the MT7681 embedded 32 - bit risc mcu for 802.11b/g/ n drivers, supplicant, tcp/ip protocol stack, and networking applications , can be operate d in station mode and softap mode. the m t7681 is an ideal solution for embedded device to enable networking service with minimized design effort . all the features are available in compact 40pin, 5x5mm qfn package . 1.2 f eatures ? single stream ieee 802.11 b/g/n ? 32 - bit risc microprocessor as the host mcu ? embedded ieee 802.11b /g/n drivers, supplicant, and tcp/ip stack ? highly integrated rf pa , lna, and rf switch ? integrate high efficiency switching regulator for single 3.3v power source ? security support for wfa wpa/wpa2 personal, wps2.0, wapi ? operation in station mode or softap mode ? rich interfaces, uart, spi, i2c, pwm and gpios ? all functions integrates in c ompact 5mm x 5mm qfn40l package ? uart interface
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 5 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 1.3 a pplications ? home automation ? smart plug ? lighting ? metering ? remote control ? network consumer devices 1.4 b lock diagram figure 1 mt 76 81 block diagram r f r e c e i v e r r f t r a n s m i t t e r b a s e b a n d m a c / p a c k e t b u f f e r / s e c u r i t y e n g i n e u a r t s y s t e m c o n t r o l r f _ i n r f _ o u t p r f _ o u t n u a r t g p i o / l e d
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 6 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 2 product d escription s 2.1 pin layout bg_extr rf_ldo rf_ldo xtal_xi xtal_xo rf_ldo pll_ldo vdd 33 vdd 12 gpio 0 40 39 38 37 36 35 34 33 32 31 rf _ ldo 1 3 0 gpio 1 rf_in 2 2 9 gpio 2 rf_ v33a 3 2 8 gpio 3 rf_outp 4 2 7 gpio4 rf_outn 5 mt76 81 2 6 uart_tx rf_ v33a 6 2 5 uart_rx vdd 33 7 2 4 ldo_rst_n fl miso 8 2 3 pmu_ phase fl mosi 9 2 2 pmu _v33 flcs 10 2 1 pmu_ comp 11 12 13 14 15 16 17 18 19 20 flc lk vdd12 gnd gnd gnd gnd pmu _12 v pmu _v15a pmu _v33 pmu_ fb figure 2 top view of mt76 81 qfn pin - out.
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 7 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 2.2 pin descripti on qfn40 pin name pin description default pu/pd i/o supply domain r eset and clocks 2 4 ldo_rst_n external system reset active low n/a input vdd 33 37 xtal_xi crystal input or external clock input n/a input 36 xtal_xo crystal output n/a input u art interface 25 uart_tx uart tx n/a vdd33 26 uart_rx uart rx n/a vdd33 flash interface 8 ee_miso external memory data input / antenna select pd input vdd 33 9 ee_mosi external memory data output / antenna select pd output vdd 33 10 ee_ cs external chip select pu output vdd 33 11 eefl_ clk external clock pu output vdd 33 p rogrammable i/o 3 0 gpio0 programmable input/output pd in/out vdd33 3 1 g pio1 programmable input/output pd in/out vdd 33 29 gpio2 programmable input/output pd in/out vdd 33 28 gpio3 programmable input/output pd in/out vdd 33 2 7 gpio4 programmable input/output pd in/out vdd 33 wifi radio interface 40 bg_extr rf bg reference n/a 2 rf _ in rf auxiliary rx input n/a 4 rf_outp rf port n/a 5 rf_outn rf port n/a pmu 17 pmu _12 v pmu 1.2v output n/a output 18 pmu _v15a pmu 1.5v input n/a i utput 19,22 pmu _v33 pmu 3.3v power supply n/a input 20 pmu_ fb pmu control n/a 21 pmu_ comp pmu control n/a 23 pmu_ phase pmu control n/a power supplies 7,33 vdd 33 digital i/o power supply n/a input
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 8 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 1 2 ,32 vdd 12 digital core power supply n/a input 3 ,6 rf_v33a rf 3.3 v power supply n/a input 1,35 , 3 8, 39 rf _ldo rf power supply n/a input 34 pll_ldo rf power supply n/a input e - pad dvss digital ground n/a table 1 pin descriptions
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 9 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 2.3 strapping option qfn 40 pin name pin description default pu/pd 8 f l miso xtal_20_sel xtal is 20mhz: pull up xtal is 40mhz: pull down pd 27 gpio4 ext_ee_sel: pull down pd 25 uart_rx chip_mode[2]: pull down pd 1 1 fl clk chip_mode[1]: pull up pd 9 fl mosi chip_mode[0]: pull down pu table 2 strapping option
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 10 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 2.4 package i nformation 2.4.1 qfn packaging
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 11 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. figure 3 p ackage outline drawing
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 12 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 2.5 ordering i nformation part number package operational temperature range mt 7681n 5x5x0. 8 mm 40 - qfn - 10 ~ 70 c table 3 ordering information 2.6 top marking information figure 4 top marking
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 13 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. 3 electrical characteristics 3.1 absolute maximum rating symbol parameters maximum rating u nit vdd33 3.3v supply voltage - 0.3 to 3. 6 v vdd12 1.2v supply voltage - 0.3 to 1 .5 v vdd15 1.5v supply voltage - 0.3 to 1.8 v t stg storage temperature - 40 to +125 c vesd esd protection (hbm) 2000 v table 4 absolute maximum ratings 3.2 recommended operating range symbol rating min typ max unit vdd 33 3.3v supply voltage 2.97 3.3 3.63 v vdd12 1.2v supply voltage 1.14 1.2 1.26 v vdd15 1.5v supply voltage 1.425 1.5 1.575 v t ambient ambient temperature - 10 - 70 c table 5 recommended operating range 3.3 dc characteristics symbol parameter conditions min max unit v il input low voltage lvttl - 0.28 0.6 v v ih input high voltage 2.0 3.63 v v t - schmitt trigger negative going threshold voltage lvttl 0.68 1.36 v v t+ schmitt trigger positive going threshold voltage 1.36 1.7 v v ol output low voltage |i ol | = 1.6~14 ma - 0.28 0.4 v v oh output high voltage |i oh | = 1.6~14 ma 2.4 vdd33 + 0.33 v r pu input pull - up resistance pu=high, pd=low 40 190 k ? r pd input pull - down resistance pu=low, pd=high 40 190 k ? table 6 dc description 3.4 thermal char a cteristics symbol description performance typ unit t j maximum junction temperature (plastic package) 125 c ja junction to ambient temperature thermal resistance [1] [2] 48.11 c /w jc junction to case temperature thermal resistance tbd c /w
mt 7681 preliminary datasheet confidential a mediatek confidential ? 2013 - 2014 mediatek inc. page 14 of 14 this document contains information that is proprietary to mediatek inc. unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited. jt junction to the package thermal resistance [ 3 ] 3.23 c /w note : [1] air flow condition: natural convection . 0.5m/s. [2] pcb dimension 21mm x 11mm. 4 - layer . [3] 5mm x 5mm qfn40l package table 7 thermal information 3.5 current consumption description performance typ unit sleep mode 1.1 ma rx active, ht40, mcs7 151 ma rx power saving, dtim=1 15 ma rx listen 6 ma tx ht40, mcs7 @1 5 dbm 210 ma tx cck, 11m bps @ 1 9 dbm 242 ma note: all result is measured at the antenna port and vdd33 is 3.3v table 8 wlan 2.4ghz current consumptio n esd caution mt 7681 is esd (electrostatic discharge) sensitive device and may be damaged with esd or spike voltage. although mt 768 1 is with built - in esd protection circuitry, please handle with care to avoid the permanent malfunction or the performance degradation.

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