Atmel ATA5283 - Manual

Features
• Wake-up Function for a Microcontroller with Preamble Detection
• 1 mV
rms
Sensitivity
• 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
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