ATA5275 ATMEL Corporation, ATA5275 Datasheet - Page 6

• Manufacturer Part Number: ATA5275
• Description: Integrated 1.5 A peak current BCDMOS antenna driver IC dedicated as a 125 kHz wake-up channel transmitter for TPM applications
• Manufacturer: ATMEL Corporation

Transmission Acknowledge
and Error Signal
Internal Voltage
Regulator and POR
6
ATA5275 [Preliminary]
Figure 8. Time Out and Time Out Reset Protocol
For continuous transmission periods the internal time out timer must be reset within the
time out reset period T
time periods can be made by cyclical resetting of the time out timer (see Figure 8). The
time T
If no failure is detected during a transmission sequence the IC acknowledges the trans-
mission by pulling the DIO line to low level for time T
acknowledge signal is generated at the end of a transmission sequence if the DIO line
was high for the time T
Their are two types of error detection (see section “Diagnosis and Protection”):
•
•
At the end of transmission the IC indicates the failure by an error signal by pulling the
DIO line to a low level for time T
With the acknowledge and the error signal a connected microcontroller is able to recog-
nize failures of the IC or the antenna module as well as DIO line failures like a broken
wire or a short circuit.
Figure 9. Transmission Acknowledge and Error Signal
The various failure types are monitored during transmission in time TFDx (see section
“Diagnosis and Protection”). The time TFDx depends on the antenna resonance
frequency.
The IC contains a 5-V regulator. It is used for the supply voltage V
and the low voltage analog circuits. Additionally, the V
loads up to 10 mA. The stabilized voltage is available at pin VCC and must be buffered
with an external capacitor.
Immediate switch-off of the driver stage
The failure is indicated through the DIO line based on transmission acknowledge
and Error signal
ORP
DIO
DRV
Standby
and T
DIO
DRV
COIL
Transmission
OR
Delay
depends on the antenna resonance frequency.
TD_L TOUT_L
ORP
OUTH
Time Out
with a short high pulse of length T
(typically 16 ms).
Time Out
TOUT_H
ERR
Standby
(typically 128 µs) instead of T
Acknowledge
TACK
Timeout
Reset
TOR
Reset Periode
TDFx
TORP
Time Out
Failure Detection
Failure
CC
ACK
OR
can be used externally for
Time Out
TOUT_H
at DIO. Any transmission
(typically 256 µs). The
ACK
CC
TD_H
Error Signal
.
of the logic circuits
Transmission
Delay
TERR
4739B–AUTO–10/04