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Features
• Wake-up Function for a Microcontroller with Preamble Detection
1mV Sensitivity
rms
1 µA Standby Current
Power Supply: 2V to 3.8V
Baud Rate: up to 4 kbps (ASK Modulation)
Operation Temperature: up to 125°C
Withstands +175°C
Few External Components
Interface IC for
Application
125 kHz
Tire Pressure Monitoring (TPM)
Wake-up
1. Description
Function
The ATA5283 is a 125 kHz ultra-low power receiver used for the wake-up function of
Tire Pressure Monitoring (TPM) applica
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2. Pin Configuration Figure 2-1. Pinning TSSOP8L COIL 1 8 VDD TST1 2 7 N_WAKEUP TST2 3 6 N_DATA VSS 4 5 RESET 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 2 ATA5283 4598H–AUTO–03/07
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ATA5283 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
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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 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 s
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ATA5283 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 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
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Figure 3-5. Turn Off Delay Time (t ) versus Antenna Q-Factor off 200 180 f = 125 kHz field 160 140 typ. max. 120 100 80 60 min. 40 20 0 05 10 20 30 400 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 gap
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ATA5283 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
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Figure 3-7. Pin Connection and Pin Protection ATA5283 COIL_X 1 8 VDD Divider impedance 143 kΩ to 5 MΩ VDD VDD TST1 2 7 N_WAKEUP 2 kΩ VDD VDD VDD TST2 3 6 N_DATA 2 kΩ VDD VSS 4 5 RESET 1 kΩ Figure 3-8. Coil Input Impedance 10000 max. typ. min. Ω 1000 100 1 10 100 1000 10000 Coil Input Signal (mV ) pp 8 ATA5283 4598H–AUTO–03/07 Z (k )
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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 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 Symbol Value Unit Power supply V –0.3 to +6.5 V DD Input v
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7. Electrical Characteristics V = 0V, V = 2V to 3.8V, T = –40° C to +105°C, characterized up to 125°C, unless other specified SS DD amb No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 1 Power Supply and Coil Limiter 1.1 Power supply 8 V 23.2 3.8 V A DD Reset supply current –40 0.8 µA A Reset supply current +25 0.8 µA A 1, 2, 3, 1.2 Reset supply current +85 I 0.4 0.8 µA C DDR 8 Reset supply current +105 1.0 µA A Reset supply current +125 1.5 µA C Supply current 1.4 µA A (sta
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ATA5283 7. Electrical Characteristics (Continued) V = 0V, V = 2V to 3.8V, T = –40° C to +105°C, characterized up to 125°C, unless other specified SS DD amb No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 3 Automatic Gain Control V ≥ 3mV at IN rms 3.1 Preamble detection time t 192 Periods B DAGC 125 kHz f = 125 kHz V = 1 mV t 0 IN rms AGC 3.2 AGC adjustment time V = 3 mV t 48 Periods C IN rms AGC V = 30 mV t 220 IN rms AGC V = 100 mV t 292 IN rms AGC V = 1V t 450 512 IN rms A
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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 9. Package Information Package: TSSOP 8L Dimensions in mm 3±0.1 3±0.1 +0.06 0.31-0.07 3.8±0.3 0.65 nom. 4.9±0.1 3 x 0.65 = 1.95 nom. 85 technical drawings according to DIN specifications 14 Drawing-No.: 6.543-5083.01-4 Issue: 2; 15.03.04 12 ATA5283 4598H–AUTO–03/07 +0.05 0.15-0.02 +0.05 1-0.15 0.85±0.05 0.1±0.05
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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 • Put datasheet in a new template 4598G-AUTO-01/07 • Pb-free logo on page 1 deleted • Put datasheet in a new template • Pb-free logo on page 1 added 4598F-AUTO-09/05 • Heading Rows on Table “Absolute Maximum Ratings” on p
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Atmel Corporation Atmel Operations 2325 Orchard Parkway Memory RF/Automotive San Jose, CA 95131, USA 2325 Orchard Parkway Theresienstrasse 2 Tel: 1(408) 441-0311 San Jose, CA 95131, USA Postfach 3535 Fax: 1(408) 487-2600 Tel: 1(408) 441-0311 74025 Heilbronn, Germany Fax: 1(408) 436-4314 Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers Regional Headquarters 2325 Orchard Parkway 1150 East Cheyenne Mtn. Blvd. Europe San Jose, CA 95131, USA Colorado Springs, CO 80906, USA Atmel Sarl Tel
