ATA5275-PGQ ATMEL Corporation, ATA5275-PGQ Datasheet - Page 5

• Manufacturer Part Number: ATA5275-PGQ
• Description: 125 kHz Transmitter IC FOR TPM
• Manufacturer: ATMEL Corporation

3.3
3.3.1
3.3.2
4739C–AUTO–02/05
Transmission Mode
ASK Modulation
Anti-bouncing Filter in Transmission Mode
Figure 3-3.
For the transmission of a wake-up signal or data to a receiver, the ATA5275 generates a
antenna resonance synchronized signal at the antenna driver output (DRV pin). A connected LC
antenna radiates a magnetic field. For the data transmission the field can be 100% amplitude
modulated by the DIO interface input. If a low level signal is applied at the DIO pin, the driver
generates a square wave signal DRV for the antenna. If a high level signal is applied at the DIO
pin the driver is stopped and switched to ground. In this way ASK modulated data can be trans-
mitted (see
Figure 3-4.
The DIO input signal is delayed for a anti-bouncing time.
The driver is switched on after a delay time of T
level continuously. The driver is switched-off after a delay time of T
level.
The T
pulses from the DIO Line.
Figure 3-5.
DH
COIL
time depends on the antenna resonance frequency, suppressing short disturbance
DRV
DIO
Figure
STBY After DIO = L
Data Transmission
Anti-bouncing
3-4).
STBY
DIO
TD_L
TOUT_L
DL
(typically 64 µs) if the DIO is pulled to a low
ATA5275 [Preliminary]
t
t
TD_H
DH
if the DIO is pulled to high
5