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features ? wake-up function for a microcontr oller with preamble detection 1mv rms sensitivity 1 a standby current power supply: 2v to 3.8v baud rate: up to 4 kb ps (ask modulation) operation temperature: up to 125c withstands +175c few external components application tire pressure mo nitoring (tpm) 1. description the ata5283 is a 125 khz ultra-low power receiver used for the wake-up function of tire pressure monitoring (tpm) application. the sensitive input stage of the ic ampli- fies and demodulates the carrier signal from the antenna coil to a digital output signal for a microcontroller. during the standby mode the preamble detection unit monitors the incoming signal and activates the wake-up output and the data output, if the ic receives a proper 125 khz carrier signal. by combining the ic with an antenna coil, a microcontroller, an rf transmitter/trans- ceiver, a battery, temperature- and pressure sensor, it is possible to design a complete tire pressure monitoring system (tpm). figure 1-1. block diagram condi- tioner amplifier with agc preamble check n_wakeup n_data reset coil vref gnd vdd ata5283 battery lx tst1 tst2 interface ic for 125 khz wake-up function ata5283 4598h?auto?03/07
2 4598h?auto?03/07 ata5283 2. pin configuration figure 2-1. pinning tssop8l vdd 3 4 2 1 n_data n_wakeup reset coil 8 7 6 5 tst2 tst1 vss figure 2-2. pin description pin symbol function 1 coil antenna coil input 2 tst1 test pin (reserved) 3 tst2 test pin (reserved) 4 vss signal ground 5 reset external reset input 6 n_data data signal 7 n_wakeup low active wake-up signal for microcontroller 8 vdd battery voltage
3 4598h?auto?03/07 ata5283 3. functional description the ata5283 is an ultra-low pow er ask receiver. without a carr ier signal it operates in the standby listen mode. in this mode it monitors th e coil input with a very low current consumption. to activate the ic and the connected control unit, the transmitting stage must send the preamble carrier burst. after a preamble is detected the ic is activated. it adapts the gain of the input stage and enables the wake-up and the data output. the first gap at the end of the preamble gener- ates a wake-up signal for the microcontroller. af ter that the receiver outputs the data signal at n_data. to return the ic into the standby listen mode it must be reset via the reset input. 3.1 agc amplifier the input stage contains an automatic gain c ontrol (agc) amplifier to amplify the input signal from the coil. the gain is adjusted by the auto matic gain control circuit if a preamble signal is detected. the high dynamic range of the agc enables the ic to operate with input signals from 1mv rms to 1.1v rms . after the agc settling time the amplifier output delivers a 125 khz signal with an amplitude adjusted for the following evaluation circuits? preamble detection, signal condi- tioner, wake-up. 3.2 preamble detection before data transmission the ic stays in standby listen mode. to prevent the circuit from unin- tended operations in a noisy environment the prea mble detection circuit checks the input signal. a valid signal is detected by a counter after 192 carrier periods without interrupts. short inter- rupts which are suppressed by the signal condi tioner are tolerated. when a valid carrier (preamble) is found the circuit starts the automatic gain control. it requires up to 512 carrier peri- ods to settling. the complete preamble should have 704 carrier periods minimum. the preamble is terminated and the data transfer is started with the first gap (start gap) in the carrier (see fig- ure 3-1 ). figure 3-1. communication protocol data start gap 0.5 a 2 a 1 a preamble > 5.64 ms procedure current profile gain control reset n_wakeup n_data signal 192 periods of lf > 512 periods of lf agc adjustment no gain control no gain control gain control active
4 4598h?auto?03/07 ata5283 3.3 automatic gain control for a correct demodulation the signal conditione r needs appropriate internal signal amplitude. to control the input signal the ata5283 has a build in digital agc. the gain control circuit regu- lates the internal signal amplitude to the reference value (ref2, figure 3-2 ). it decreases the gain by one step if the internal signal exceeds the reference level for two periods and it increases the gain by one step if eight periods do not achieve the reference level. in the standby listen mode the gain is reset to the maximum value. if a valid preamble signal (192 valid carrier clocks) is detected the automatic gain control is activated. note: with the variation of the gain the coil input impedance changes from high impedance to minimal 143 k ? because of the internal regulator circuit (see figure 3-8 on page 8 ). figure 3-2. automatic gain control n_data internal comparator signal gain controlled signal coil input ref. 1 gap detection reference ref. 2 100% 50% gain control reference transmitted signal
5 4598h?auto?03/07 ata5283 3.4 signal conditioner the signal conditioner demodulates the amplifier outp ut signal and converts it to a binary signal. it compares the carrier signal with the 50% reference level (see ref1 in figure 3-3 ) and delivers a logical 1, if the carrier signal stays below the reference and a logical 0, if it exceeds the refer- ence level. a smoothing filter suppress the space between the half-waves as well as a few missing periods in the carrier and glitches during the gaps. the output signal of the signal conditioner is used as the internal data signal for the data output, the wake-up logic and the preamble detection. the timing of the demodulated data signal is delayed related to the signal at the transmitting end. this delay is a function of the carrier frequency, the behavior of the smoothing filter and the antenna q-factor. the smoothing filter causes a delay of 3 to 6 periods (see t b and t d in figure 3-3 ). the rest of the delay is caused by the build-up time of the antenna signal and is condi- tioned on the q-factor (see t a and t c in figure 3-3 ). figure 3-3. output timing the following diagrams show the delay of the data signal as a function of the antenna q-factor. figure 3-4. turn on delay time (t on ) versus antenna q-factor t b t on t d t a 50% 100% coil input comparator output ref.2 n_data ref.1 t c t off 050 40 30 20 10 250 200 50 0 150 max. min. typ. 100 q-factor t on (s) f field = 125 khz
6 4598h?auto?03/07 ata5283 figure 3-5. turn off delay time (t off ) versus antenna q-factor 3.5 data output the data output n_data outputs the demodulated and digitized lf signal according to the envelope of the antenna input signal. in the standby mode the n_data output is disabled and set to level 1. it is enabled by the wake-up signal and it outputs 1 level if the ic detects the car- rier signal and a 0 level during the gaps (see figure 3-1 on page 3 ). as the circuit does not check the received data (except the preamble), it is up to the user to choose the kind of encoding (pulse distance, manchester, bi-phase...) wanted. 3.6 wake-up signal the wake-up signal (n_wakeup) i ndicates that the ata5283 has detected the end of a pream- ble signal and has left the standby mode. it can be used as a wake-up or a chip select signal for an external device (see figure 3-1 on page 3 ). after a preamble is detected the first valid gap (s tart gap) sets the n_wakeup output to low and enables the data output n_data. the n_wakeup holds the low level until the ic is reset to the standby mode by a reset signal. 3.7 reset the ic is reset either by the internal por circ uit during a power on sequence or by a high pulse at the reset pin. after the reset all internal counters are in the initial state and the ic is in the standby listen mode. the por circuit generates a reset while the supply voltage v dd is below the power on reset threshold v por and release the function of the ic if v dd exceeds this threshold. a high signal at the reset pin resets the complete circuit. if the ic is activated a reset signal is necessary to activate the standby listen mode. the reset pin can also be used to hold the ic in a power down stat e. in this stat e the ic is out of operation and the current consumption is below the standby current. note: the reset pin is high impedance cmos input . to avoid floating effe cts like undef ined input states and malfunctions it should not be open. 050 40 30 20 10 q-factor 180 100 60 80 0 20 40 160 120 140 200 max. min. typ. t off (s) f field = 125 khz
7 4598h?auto?03/07 ata5283 3.8 standby listen mode in the standby listen mode the ic monitors the co il input with a very low current consumption. the automatic gain control is switched off and the gain is set to the maximum value. the n_data and the n_wakeup outp ut are set to a high level. before the controller enters its standby mode after the communication, it should activate the standby listen mode of the ata5283 with a reset signal. this measure ensures that the ic enters the power saving standby mode and that the ic wakes the controller correctly with the next preamble signal. 3.9 applications figure 3-6 shows a typical tpm application of the ata5283. combined with the antenna reso- nant circuit the ata5283 is used as wake-up receiver for the microcontroller and the connected temperature- and pressure-sensor. note: to avoid supply voltage ripples to affect the microcontroller, an rc filter (r1 = 100 ? , c1 = 10 nf) is recommended. figure 3-6. application 5 7 6 1 reset r1 la ca 433 khz 125 khz c1 central board controller t5743 uhf rx uhf tx antenna driver ata5275 micro controller n_wakeup n_data vref temp. sensor pressure sensor 2 3 8 4 ata5283 atar862 amplifier with agc
8 4598h?auto?03/07 ata5283 figure 3-7. pin connection and pin protection figure 3-8. coil input impedance 2 k ? divider impedance 143 k ? to 5 m ? 2 k ? 7 vdd vdd n_wakeup n_data reset vdd tst1 tst2 vss coil_x 6 vdd ata5283 vdd vdd 1 k ? vdd 5 8 2 3 4 1 1 100 1000 10000 10 10000 1000 100 coil input signal (mv pp ) z (k ? ) min. max. typ.
9 4598h?auto?03/07 ata5283 4. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . parameters symbol value unit power supply v dd ?0.3 to +6.5 v input voltage (except coil inputs) v in v ss ? 0.3 < v in < v dd + 0.3 v input current coil i ci 10 ma input voltage coil v ci v dd ? 3.5 < v ci < v dd + 3.5 v esd protection (human body) v esd 4kv operating temperature range t amb ?40 to +125 c withstanding 175c t temp 30 min. storage temperature range t stg ?40 to +150 c soldering temperature t sld 260 c 5. thermal resistance parameters symbol value unit thermal resistance junction ambient r thja 210 k/w 6. operating range parameters symbol value unit power supply range v dd 2 to 3.8 v operating temperature range t op ?40 to +125 c
10 4598h?auto?03/07 ata5283 7. electrical characteristics v ss = 0v, v dd = 2v to 3.8v, t amb = ?40 c to +105c, characterized up to 125c, unless other specified no. parameters test conditions pin symbol min. typ. max. unit type* 1 power supply and coil limiter 1.1 power supply 8 v dd 23.23.8 v a 1.2 reset supply current ?40 1, 2, 3, 8 i ddr 0.4 0.8 a a reset supply current +25 0.8 a a reset supply current +85 0.8 a c reset supply current +105 1.0 a a reset supply current +125 1.5 a c 1.3 supply current (standby listen mode) ?40 1, 2, 3, 8 i ddl 1.1 1.4 a a supply current (standby listen mode) +25 1.5 a a supply current (standby listen mode) +85 1.6 a c supply current (standby listen mode) +105 1.6 a a supply current (standby listen mode) +125 1.7 a c 1.4 supply current with carrier (agc active) ?40 1,2, 3, 8 i dd 2 4.0 a a supply current with carrier (agc active) +25 4.1 a a supply current with carrier (agc active) +85 4.2 a c supply current with carrier (agc active) +105 4.2 a a supply current with carrier (agc active) +125 4.2 a c 1.5 coil input voltage referred to v dd (input coil limiter for channels x, y, z) i ci = 1 ma v dd = 2v 1-3 v c 1.4 vp a i ci = 1 ma v dd = 3.2v 1.6 vp a i ci = 1 ma v dd = 3.8v 1.8 vp a 2 amplifiers 2.1 wake-up sensitivity 125 khz input signal 7 v sens 12.2mv rms a 2.2 bandwidth without coil 6 b w 150 khz c 2.3 upper corner frequency without coil 6 f u 180 khz c 2.4 lower corner frequency without coil 6 f o 30 khz c 2.5 input impedance f = 125 khz 1 r in 143 k ? a 2.6 input capacitance v in 1mv rms at 125 khz 1c in 10 pf c *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
11 4598h?auto?03/07 ata5283 3 automatic gain control 3.1 preamble detection time v in 3mv rms at 125 khz t dagc 192 periods b 3.2 agc adjustment time f = 125 khz v in = 1 mv rms v in = 3 mv rms v in = 30 mv rms v in = 100 mv rms v in = 1v rms t agc t agc t agc t agc t agc 0 48 220 292 450 512 periods c 3.3 signal change rate (gap detection) coil input signal 100% to 37% ( ) 1t eos 20 periods c 3.4 agc correction time (no gap detection) coil input signal: 50 to 100% changing 1t corr 52 periods c coil input signal: 100 to 50% changing 1t corr 208 periods c 3.5 data rate (q < 20) 125 khz ask dr 4 kb/s a 3.6 delay time rf signal to data 125 khz ask t on 40 s a 3.7 delay time rf signal to data 125 khz ask t off 40 s a 4 interface 4.1 reset input level high 5 v hreset 0.8 v dd v dd va 4.1.1 reset pulse width v reset = v dd 5t reset 20 s a 4.2 reset input level low 5 v lreset 0 0.2 v dd vc 4.3 reset input leakage current low v reset = v ss 5i il -0.2 0 a a 4.4 reset input leakage current high v reset = v dd 5i ih 00.2aa 4.5 n_wakeup output level high i nwakeup = ?100 a 7 v hnwake 0.8 v dd v dd va 4.6 n_wakeup output level low i nwakeup = 100 a 7 v lnwake 00.2 v dd va 4.7 n_data output level high i n_data = ?100 a 6 v hndata 0.8 v dd v dd va 4.8 n_data output level low i n_data = 100 a 6 v lndata 00.2 v dd va 5 power supply and reset 5.1 v dd power on reset threshold v por 11.51.9 v a 5.2 power-up time switch on v dd to circuit active t pon 100 ms c 5.2.1 standby reactivation delay after pulse reset f = 125 khz t sbydel 800 s c 5.3 reset reactivation caused by negative spikes on v dd t bdn = 500 ns 7 t rst 10 200 s c 7. electrical characteristics (continued) v ss = 0v, v dd = 2v to 3.8v, t amb = ?40 c to +105c, characterized up to 125c, unless other specified no. parameters test conditions pin symbol min. typ. max. unit type* *) type means: a = 100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
12 4598h?auto?03/07 ata5283 9. package information 8. ordering information extended type number package remarks ata5283p-6aqj tssop8l 5000 pieces, taped and reeled, pb-free ATA5283P-6APJ tssop8l 500 pieces, taped and reeled, pb-free 3 0.1 0.85 0.05 0.1 0.05 specifications according to din technical drawings issue: 2; 15.03.04 drawing-no.: 6.543-5083.01-4 14 85 package: tssop 8l dimensions in mm 0.65 nom. 3 x 0.65 = 1.95 nom. 0.31 -0.07 +0.06 0.15 -0.02 +0.05 1 -0.15 +0.05 3.8 0.3 4.9 0.1 3 0.1
13 4598h?auto?03/07 ata5283 10. revision history please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revision no. history 4598h-auto-03/07 ? number 5.2.1 in section 7 ?electrical characteristics? on page 11 added 4598g-auto-01/07 ? put datasheet in a new template ? pb-free logo on page 1 deleted 4598f-auto-09/05 ? put datasheet in a new template ? pb-free logo on page 1 added ? heading rows on table ?absolute maximum ratings? on page 9 added ? ordering information on page 12 changed
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