ATA5275-PGQ ATMEL Corporation, ATA5275-PGQ Datasheet - Page 4

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

3. Functional Description
3.1
3.2
4
Operation Modes
Standby Mode and Wake-up
ATA5275 [Preliminary]
There are two different operation modes for the ATA5275:
After power-on-reset, the ATA5275 is in standby mode. For minimum power consumption, only
the internal 5 V supply and the DIO line interface are active. The IC can be activated by the
external control unit via the serial interface. The DIO line is called logic high if it is pulled up to
the VDIO voltage level. The DIO line is called logic low if it is pulled down to the VSS voltage
level. A low signal at the DIO line wakes-up the IC.
The circuit enters the standby mode if either of these three conditions are fulfilled:
Notes:
Figure 3-1.
Figure 3-2.
• Standby mode
• Transmission mode
1. After power-on-reset and the DIO is high (see
2. After a time out of T
3. After a time out of T
page
time T
1. Time does not depend on the antenna resonance frequency.
2. Time depends on the antenna resonance frequency.
5)
ACK
STBY After POR
STBY After DIO = H
/T
ERR
(1)
(see
OUTL
OUTH
Figure
(1)
(2)
during which DIO is permanently low (see
during which DIO is permanently high and an acknowledge
3-2)
POR
STBY
DIO
STBY
DIO
TOUT_H
Figure
TACK/TERR
t
t
t
t
t
3-1)
Figure 3-3 on
4739C–AUTO–02/05