ta6038fn/fng 2003-11-25 1 toshiba bipolar linear integrated circuit silicon monolithic ta6038fn,TA6038FNG shock sensor ic ta6038fn/fng detects an existence of external shock through the shock sensor and output. features ? ta6038fn/fng operates from 2.7 to 5.5 v dc single power supply voltage. ? signal from the shock sensor is amplified according to setting gain, and is detected through the internal window comparator. ? ta6038fn/fng incorporates 1-ch shock detecting circuitry. ? input terminal of sensor signal is designed high impedance. differential input impedance = 100 m ? (typ.) ? lpf (low pass filter) circuitry is incorporated. cut-off frequency of lpf = 7 khz ? sensitivity of shock detection can be adjusted by external devices. ? small package ssop10-p-0.65a (0.65 mm pitch) block diagram pin connection (top view) weight: 0.04 g (typ.) out 10 do ai ao v cc 9 8 7 6 so a 1 2 3 4 5 si a sib sob gnd 7 10 6 v cc 5 1 2 comparator + ? + ? ? 50 m ? c 3 4 ? ? diff 5 & lpf 7 khz op-amp ? +
ta6038fn/fng 2003-11-25 2 pin function pin no. pin name function 1 soa amp (a) output terminal 2 sia connection terminal of shock sensor 3 sib connection terminal of shock sensor 4 sob amp (b) output terminal 5 gnd ground terminal 6 v cc power supply voltage 7 ao op-amp output terminal 8 ai op-amp input terminal 9 do differential-amp output terminal 10 out output terminal (output = ?l? when shock is detected.) maximum ratings (ta = 25c) characteristics symbol rating unit power supply voltage v cc 7 v power dissipation p d 300 mw storage temperature t stg ? 55 to 150 c recommend operating condition characteristics symbol rating unit power supply voltage v cc 2.7 to 5.5 v operating temperature t opr ? 25 to 85 c note: the ic may be destroyed due to short circuit between adjacent pins, incorrect orientation of device?s mounting, connecting positive and negative power supply pins wrong way round, air contamination fault, or fault by improper grounding.
ta6038fn/fng 2003-11-25 3 electrical characteristics (unless otherwise specified, v cc = 3.3 v, ta = 25c) characteristics symbol test circuit test condition min typ. max unit supply voltage v cc ? ? 2.7 3.3 5.5 v v cc = 3.3 v ? 1.8 2.5 supply current i cc (1) v cc = 5.0 v ? 1.8 2.5 ma (diff-amp) characteristics symbol test circuit test condition min typ. max unit input impedance (note 1) zin ? ? 30 100 ? m ? gain gvbuf (2) ? 13.6 14 14.4 db output dc voltage vobuf (3) connect c = 1000 pf between 1 pin and 2 pin, 3 pin and 4 pin 0.7 1 1.3 v low pass filter cut-off freq. fc (4) frequency at ? 3db point 5 7 11 khz output source current ibso (5) voh = v cc ? 1 v 300 800 ? a output sink current ibsi (6) vol = 0.3 v 75 130 ? a note 1: marked parameters are reference data. (op-amp) characteristics symbol test circuit test condition min typ. max unit cut-off frequency (note 1) ft ? ? 1.5 2 ? mhz openloop gain (note 1) gvo ? ? 80 90 ? db input voltage 1 vin1 (7) ? 1.235 1.3 1.365 v input current i in (8) ? ? 25 50 na offset voltage (note 1) voff ? ? ? 5 0 5 mv output source current iaso (9) voh = v cc ? 1 v 250 800 ? a output sink current iasi (10) vol = 0.3 v 130 200 ? a note 1: marked parameters are reference data. (window-comparator) characteristics symbol test circuit test condition min typ. max unit trip voltage 1 (note 1) vtrp1 ? ? vin1 0.38 vin1 0.4 vin1 0.42 v output source current iwso (11) voh = v cc ? 0.5 v 30 50 ? a output sink current iwsi (12) vol = 0.3 v 300 800 ? a note 1: marked parameters are reference data.
ta6038fn/fng 2003-11-25 4 application note figure 1 shows the configuration of g-force sensor amplifier. the shock sensor is connected between the pins 2 and 3. < how to output 0 or 1 from the pin 10 to detect whether there is a shock or not. > ? using a sensor with the sensitivity qs (pc/g) to detect the shock g (g). ? a. setting gain: c1 = c2 (pf), r1 (k ? ), r2 (k ? ) (v) 0.4 r1 r2 5 2 c1 g qs = r1 r2 0.04 g qs c2 c1 = = (pf) 425 10 100 0.04 5 0.34 c2 c1 = = = b. setting the frequency (hz) of hpf: setting c3 ( f), r1 (k ? ) 10 3 c3 r1 2 1 (hz) fc = f) ( 0.8 10 3 20 10 2 1 c3 = = c. setting the frequency (khz) of lpf: setting c4 (pf), r2 (k ? ) 10 6 c4 r2 2 1 (khz) fc = (pf) 318 10 6 5 100 2 1 c4 = = < how to output the voltage according to the shock through the pin 7. > ? using a sensor with the sensitivity qs (pc/g), and assuming the shock sensitivity of the system is vsystem (mv/g). ? a. setting gain: c1 = c2 (pf), r1 (k ? ), r2 (k ? ) (mv/g) 10 3 vsystem r1 r2 5 2 c1 qs = (pf) 10 r1 r2 vsystem qs c2 c1 4 = = (pf) 170 10 10 100 200 0.34 c2 c1 = = = 4 figure 1 the configuration of g-force sensor amplifier 1 lpf 2 shock sensor 9 8 0.9 v 1.7 v 3 4 c 1 c 2 50m ? 50m ? 1.3 v 10 5 qs (pc/g) r 1 c 3 c 4 r 2 7 example: detecting 5 (g)-shock using a sensor with qs = 0.34 (pc/g), r1 = 10 (k ? ), r2 = 100 (k ? ). example: setting the frequency to 20 hz with r1 = 10 (k ? ). example: designing the system with 200 (mv/g) by using a sensor that qs = 0.34 (pc/g), r1 = ? = ? = 100 (k ? ).
ta6038fn/fng 2003-11-25 5 equivalent circuit 7 250 ? 50 a 1 k ? 10 a 100 ? 9 500 ? 50 a 1.5 k ? 10 a 100 ? 7 20 a 10 50 a 20 a 8 1.7 v vref 8 k ? 8 k ? 18 k ? amp 10 k ?
ta6038fn/fng 2003-11-25 6 test circuit (1) supply current i cc (2) diff-amp gain gvbuf step 1 step 2 (3) diff-amp (4) diff-amp output dc voltage vobuf low pass filter cut-off freq. fc 10 9 8 7 6 1 2 3 4 5 3.3 v m 2 m ? 2 m ? 10 9 8 7 6 1 2 3 4 5 3.3 v m m1 2 m ? 2 m ? 2 m ? 0.68 v 0.68 v 2 m ? 10 9 8 7 6 1 2 3 4 5 3.3 v m m2 0.52 0.68 1 2 gain ? ? = 2 m ? 2 m ? 2 m ? 0.68 v 0.52 v 2 m ? 10 9 8 7 6 1 2 3 4 5 3.3 v m 1000 pf 1000 pf 10 9 8 7 6 1 2 3 4 5 3.3 v m 100 pf 2 m ? 2 m ? 2 m ?
ta6038fn/fng 2003-11-25 7 (5) diff-amp (6) diff-amp output source current ibso output sink current ibsi (7) op-amp input voltage 1 vin1 (8) op-amp input current i in (9) op-amp (10) op-amp output source current iaso output sink current iasi 10 9 8 7 6 1 2 3 4 5 3.3 v m 2.3 v 2 m ? 2 m ? 2 m ? 10 9 8 7 6 1 2 3 4 5 3.3 v m 0.3 v 2 m ? 2 m ? 2 m ? 10 9 8 7 6 1 2 3 4 5 3.3 v m 10 k ? 10 9 8 7 6 1 2 3 4 5 3.3 v m 1.1 v 2 10 9 8 7 6 1 2 3 4 5 3.3 v m 1.1 v 2.3 v 10 9 8 7 6 1 2 3 4 5 3.3 v m 1.5 v 0.3 v
ta6038fn/fng 2003-11-25 8 (11) window comparator (12) window comparator output source current iwso output sink current iwsi test circuit (for reference) (a) diff-amp (b) diff-amp cmrr psrr 10 9 8 7 6 1 2 3 4 5 3.3 v 1.5 v 1.3 v m 2.85 v 10 9 8 7 6 1 2 3 4 5 3.3 v 1.5 v 0.8 v m 0.3 v 10 9 8 7 6 1 2 3 4 5 3.3 v m 150 pf 150 pf 300 pf 300 pf 10 9 8 7 6 1 2 3 4 5 4.5 v m 150 pf 300 pf
ta6038fn/fng 2003-11-25 9 package dimensions weight: 0.04 g (typ.)
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