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Features
•
Wake-up Function for a Microcontroller with Preamble Detection
•
1 mV
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
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 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
Lx
COIL
Vref
TST1
TST2
Battery
VDD
Amplifier
with AGC
Condi-
tioner
GND
ATA5283
RESET
N_WAKEUP
Preamble
check
N_DATA
Interface IC for
125 kHz
Wake-up
Function
ATA5283
4598H–AUTO–03/07
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Summary of Contents for Atmel ATA5283
- Page 1 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 ampli- fies and demodulates the carrier signal from the antenna coil to a digital output signal for a microcontroller.
-
Page 2: Pin Configuration
Symbol Function COIL Antenna coil input TST1 Test pin (reserved) TST2 Test pin (reserved) Signal ground RESET External reset input N_DATA Data signal N_WAKEUP Low active wake-up signal for microcontroller Battery voltage ATA5283 COIL TST1 N_WAKEUP TST2 N_DATA RESET 4598H–AUTO–03/07... -
Page 3: Functional Description
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. -
Page 4: 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, 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. -
Page 5: Signal Conditioner
Figure 3-4. 4598H–AUTO–03/07 and t Figure Output Timing Ref.2 Ref.1 Coil input output Turn On Delay Time (t ) versus Antenna Q-Factor = 125 kHz field ATA5283 Figure 3-3). typ. max. min. Q-factor 3-3) and delivers and t Figure 100%... -
Page 6: Data Output
(pulse distance, Manchester, bi-phase...) wanted. Wake-up Signal The wake-up signal (N_WAKEUP) indicates 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... - Page 7 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.
- Page 8 Figure 3-7. Figure 3-8. ATA5283 Pin Connection and Pin Protection ATA5283 COIL_X Divider impedance 143 k to 5 M TST1 TST2 Coil Input Impedance 10000 max. typ. min. 1000 Coil Input Signal (mV N_WAKEUP N_DATA RESET 1000 10000 4598H–AUTO–03/07...
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Page 9: Absolute Maximum Ratings
±10 – 3.5 < V –40 to +125 TEMP –40 to +150 Symbol Value thJA Symbol Value 2 to 3.8 –40 to +125 ATA5283 Unit < V + 0.3 < V + 3.5 °C min. °C °C Unit Unit °C... -
Page 10: Electrical Characteristics
Upper corner frequency Lower corner frequency Input impedance Input capacitance *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter ATA5283 Test Conditions Symbol 1, 2, 3, 1, 2, 3, 1,2, 3, = ±... - Page 11 N_DATA Switch on V to circuit active f = 125 kHz = 500 ns Min. Typ. Max. DAGC CORR CORR -0.2 HNDATA LNDATA Sbydel ATA5283 Unit Type* Periods Periods Periods Periods Periods Kb/s µs µs µs µA µA µs µs...
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Page 12: Ordering Information
ATA5283P-6AQJ ATA5283P-6APJ 9. Package Information Package: TSSOP 8L Dimensions in mm 3 x 0.65 = 1.95 nom. Drawing-No.: 6.543-5083.01-4 Issue: 2; 15.03.04 ATA5283 Package Remarks TSSOP8L 5000 pieces, taped and reeled, Pb-free TSSOP8L 500 pieces, taped and reeled, Pb-free ±0.1 +0.06... -
Page 13: Revision History
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 ATA5283... - Page 14 Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDI- TIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY...
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