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Features
* * * * * * * *
Wake-up Function for a Microcontroller with Preamble Detection 1 mVrms Sensitivity 1 A Standby Current Power Supply: 2V to 3.8V Baud Rate: up to 4 kbps (ASK Modulation) Operation Temperature: up to 125C Withstands +175C Few External Components
Application
* Tire Pressure Monitoring (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 amplifies 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/transceiver, a battery, temperature- and pressure sensor, it is possible to design a complete Tire Pressure Monitoring system (TPM). Figure 1-1. Block Diagram
Battery
Interface IC for 125 kHz Wake-up Function ATA5283
VDD Lx COIL Amplifier with AGC
ATA5283
RESET
Vref
Conditioner
Preamble check
N_WAKEUP
N_DATA TST1 TST2 GND
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2. Pin Configuration
Figure 2-1. Pinning TSSOP8L
COIL TST1 TST2 VSS 1 2 3 4 8 7 6 5 VDD N_WAKEUP N_DATA RESET
Figure 2-2.
Pin 1 2 3 4 5 6 7 8
Pin Description
Symbol COIL TST1 TST2 VSS RESET N_DATA N_WAKEUP VDD Function Antenna coil input Test pin (reserved) Test pin (reserved) Signal ground External reset input Data signal Low active wake-up signal for microcontroller Battery voltage
2
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3. Functional Description
The ATA5283 is an ultra-low power ASK receiver. Without a carrier signal it operates in the standby listen mode. In this mode it monitors the 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 generates a wake-up signal for the microcontroller. After 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 Control (AGC) amplifier to amplify the input signal from the coil. The gain is adjusted by the automatic 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 1 mVrms to 1.1Vrms. 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 conditioner, wake-up.
3.2
Preamble Detection
Before data transmission the IC stays in standby listen mode. To prevent the circuit from unintended operations in a noisy environment the preamble detection circuit checks the input signal. A valid signal is detected by a counter after 192 carrier periods without interrupts. Short interrupts which are suppressed by the signal conditioner are tolerated. When a valid carrier (preamble) is found the circuit starts the automatic gain control. It requires up to 512 carrier periods 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 Figure 3-1).
Figure 3-1.
Communication Protocol
Preamble > 5.64 ms Start gap
Procedure
Data
192 Periods of LF
> 512 Periods of LF
Signal
N_DATA
N_WAKEUP
RESET
Gain control Current profile
No gain control
AGC adjustment
Gain control active
No gain control
1 A
2 A
0.5 A
3
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3.3
Automatic Gain Control
For a correct demodulation the signal conditioner needs appropriate internal signal amplitude. To control the input signal the ATA5283 has a build in digital AGC. The gain control circuit regulates 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
Transmitted signal
Coil input
Gain control reference
Ref. 2
Gap detection Ref. 1 reference
100% 50%
Gain controlled signal
Internal comparator signal
N_DATA
4
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3.4 Signal Conditioner
The signal conditioner demodulates the amplifier output 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 reference 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 tb and td in Figure 3-3). The rest of the delay is caused by the build-up time of the antenna signal and is conditioned on the Q-factor (see ta and tc in Figure 3-3). Figure 3-3.
Ref.2 Ref.1 Coil input
Output Timing
100% 50%
Comparator output N_DATA
ta tON
tb
tc td tOFF
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 (tON) versus Antenna Q-Factor
250 ffield = 125 kHz 200 typ. max.
ton (s)
150
100 min. 50
0 0 10 20 30 40 50
Q-factor
5
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Figure 3-5.
Turn Off Delay Time (toff) versus Antenna Q-Factor
200 180 160 140 max. typ. ffield = 125 kHz
toff (s)
120 100 80 60 40 20 0 0 10 20
min.
30
40
50
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 carrier 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) indicates that the ATA5283 has detected the end of a preamble 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 (Start 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 circuit 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 VDD is below the power on reset threshold VPOR and release the function of the IC if VDD 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 state. In this state 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 effects like undefined input states and malfunctions it should not be open.
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3.8 Standby Listen Mode
In the standby listen mode the IC monitors the coil 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 output 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 resonant 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
R1 125 kHz
Amplifier with AGC 8
C1
ATA5283
5 7 6
RESET N_WAKEUP N_DATA
Temp. sensor
Central board controller
Antenna driver ATA5275
LA
CA
1
Micro controller Pressure sensor
Vref 2 3 4
UHF Rx UHF Tx T5743
433 kHz
ATAR862
7
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Figure 3-7.
Pin Connection and Pin Protection
ATA5283
COIL_X
1
Divider impedance 143 k to 5 M
8
VDD
VDD
VDD
TST1
2
2 k
7
N_WAKEUP
VDD
VDD
VDD
TST2
3
2 k
6
N_DATA
VDD
VSS
4
1 k
5
RESET
Figure 3-8.
Coil Input Impedance
10000
max. typ. min.
Z (k)
1000
100 1 10 100 1000 10000
Coil Input Signal (mVpp)
8
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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 those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Power supply Input voltage (except coil inputs) Input current coil Input voltage coil ESD protection (human body) Operating temperature range Withstanding 175C Storage temperature range Soldering temperature Symbol VDD VIN ICI VCI VESD Tamb tTEMP Tstg Tsld Value -0.3 to +6.5 VSS - 0.3 < VIN < VDD + 0.3 10 VDD - 3.5 < VCI < VDD + 3.5 4 -40 to +125 30 -40 to +150 260 Unit V V mA V kV C min. C C
5. Thermal Resistance
Parameters Thermal resistance junction ambient Symbol RthJA Value 210 Unit K/W
6. Operating Range
Parameters Power supply range Operating temperature range Symbol VDD TOP Value 2 to 3.8 -40 to +125 Unit V C
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7. Electrical Characteristics
VSS = 0V, VDD = 2V to 3.8V, Tamb = -40 C to +105C, characterized up to 125C, unless other specified No. 1 1.1 Parameters Power supply Reset supply current -40 Reset supply current +25 1.2 Reset supply current +85 Reset supply current +105 Reset supply current +125 Supply current (standby listen mode) -40 Supply current (standby listen mode) +25 1.3 Supply current (standby listen mode) +85 Supply current (standby listen mode) +105 Supply current (standby listen mode) +125 Supply current with carrier (AGC active) -40 Supply current with carrier (AGC active) +25 1.4 Supply current with carrier (AGC active) +85 Supply current with carrier (AGC active) +105 Supply current with carrier (AGC active) +125 ICI = 1 mA VDD = 2V ICI = 1 mA VDD = 3.2V ICI = 1 mA VDD = 3.8V 2 2.1 2.2 2.3 2.4 2.5 2.6 Amplifiers Wake-up sensitivity Bandwidth Upper corner frequency Lower corner frequency Input impedance Input capacitance 125 kHz input signal Without coil Without coil Without coil f = 125 kHz VIN 1 mVrms at 125 kHz 7 6 6 6 1 1 VSENS BW fu fo RIN CIN 143 10 1 150 180 30 2.2 mVrms kHz kHz kHz k pF A C C C A C 1-3 VC 1.4 1.6 1.8 1,2, 3, 8 IDD 2 1, 2, 3, 8 IDDL 1.1 1, 2, 3, 8 IDDR 0.4 Test Conditions Pin 8 Symbol VDD Min. 2 Typ. 3.2 Max. 3.8 0.8 0.8 0.8 1.0 1.5 1.4 1.5 1.6 1.6 1.7 4.0 4.1 4.2 4.2 4.2 Unit V A A A A A A A A A A A A A A A Vp Vp Vp Type* A A A C A C A A C A C A A C A C A A A Power Supply and Coil Limiter
1.5
Coil input voltage referred to VDD (Input coil limiter for channels X, Y, Z)
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
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7. Electrical Characteristics (Continued)
VSS = 0V, VDD = 2V to 3.8V, Tamb = -40 C to +105C, characterized up to 125C, unless other specified No. 3 3.1 Parameters Automatic Gain Control Preamble detection time VIN 3 mVrms at 125 kHz f = 125 kHz VIN = 1 mVrms VIN = 3 mVrms VIN = 30 mVrms VIN = 100 mVrms VIN = 1Vrms Coil input signal 100% to 37% ( ) Coil input signal: 50 to 100% changing Coil input signal: 100 to 50% changing 125 kHz ASK 125 kHz ASK 125 kHz ASK 1 1 1 tAGC tAGC tAGC tAGC tAGC tEOS tCORR tCORR DR tON tOFF 0.8 x VDD 20 0 -0.2 0 0.8 x VDD 0 0.8 x VDD 0 1 1.5 0.2 x VDD 0 0.2 VDD 0.2 x VDD VDD 0.2 x VDD 1.9 100 800 10 200 4 40 40 0 48 220 292 450 tDAGC 192 Periods B Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
3.2
AGC adjustment time
Periods
C
512 20 52 208 Periods Periods Periods Kb/s s s C C C A A A
3.3
Signal change rate (gap detection) AGC correction time (no gap detection) Data rate (Q < 20) Delay time RF signal to data Delay time RF signal to data Interface Reset input level high Reset pulse width Reset input level low Reset input leakage current low Reset input leakage current high
3.4
3.5 3.6 3.7 4 4.1 4.1.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 5 5.1 5.2 5.2.1 5.3
5 VRESET = VDD 5 5 VRESET = VSS VRESET = VDD 5 5 7 7 6 6
VHRESET tRESET VLRESET IIL IIH VHNWAKE VLNWAKE VHNDATA VLNDATA VPOR
VDD
V s V A A V V V V V ms s s
A A C A A A A A A A C C C
N_WAKEUP output level high INWAKEUP = -100 A N_WAKEUP output level low N_DATA output level high N_DATA output level low Power Supply and Reset VDD power on reset threshold Power-up time Standby reactivation delay after pulse reset Switch on VDD to circuit active f = 125 kHz INWAKEUP = 100 A IN_DATA = -100 A IN_DATA = 100 A
tPON TSbydel 7 tRST
RESET reactivation caused by tBDN = 500 ns negative spikes on VDD
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
11
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8. Ordering Information
Extended Type Number ATA5283P-6AQJ ATA5283P-6APJ Package TSSOP8L TSSOP8L Remarks 5000 pieces, taped and reeled, Pb-free 500 pieces, taped and reeled, Pb-free
9. Package Information
Package: TSSOP 8L Dimensions in mm
0.850.05
1-0.15
+0.05
30.1
30.1
0.31-0.07 0.65 nom. 3 x 0.65 = 1.95 nom. 8 5
3.80.3 4.90.1
technical drawings according to DIN specifications
Drawing-No.: 6.543-5083.01-4 Issue: 2; 15.03.04
1
4
12
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5 0.15-0.02
+0.0
+0.06
0.10.05
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. 4598H-AUTO-03/07 4598G-AUTO-01/07 History * Number 5.2.1 in section 7 "Electrical Characteristics" on page 11 added * Put datasheet in a new template * Pb-free logo on page 1 deleted * * * * 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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