TDA8029 Philips Semiconductors, TDA8029 Datasheet - Page 46

• Manufacturer Part Number: TDA8029
• Description: Low power single card reader
• Manufacturer: Philips Semiconductors

Philips Semiconductors
8.17
When the session is completed, the microcontroller resets
bit START (t
deactivation sequence shown in Fig.13:
t
t
t
0.4 V.
2003 Oct 30
11
14
de
handbook, full pagewidth
Card reset (pin RST falls LOW) (t
Clock (pin CLK) is stopped LOW (t
Pin I/O falls to 0 V (t
V
The DC/DC converter is stopped and CLK, RST, V
and I/O become low impedance to GNDC (t
Low power single card reader
= t
= t
is the time that V
CC
10
11
falls to 0 V with typical 0.17 V/ s slew rate (t
Deactivation sequence
+
+
3
3
/
/
64
2
10
T, t
T, t
). The circuit then executes an automatic
15
START
12
= t
V CC
V UP
RST
CLK
= t
I/O
CC
11
11
13
needs for going down to less than
+
)
+
7
1
/
2
/
2
T.
t 10
T, t
13
t 11
= t
11
12
11
)
)
+ T,
t 12
Fig.13 Deactivation sequence.
t de
15
).
t 13
14
)
CC
t 14
46
Automatic emergency deactivation is performed in the
following cases:
If the reason of the deactivation is a card take off, an
overcurrent or an overheating, then INT0_N is LOW. The
corresponding bit in the hardware status register is set. Bit
START is automatically reset.
If the reason is a supply dropout, then the deactivation
sequence occurs, and a complete reset of the chip is
performed. When the supply will be OK again, then the bit
SUPL will be set in HSR.
Withdrawal of the card (PRES LOW)
Overcurrent detection on V
Overcurrent detection on RST (bit PRTL1 set)
Overheating (bit PTL set)
Supply too low (bit SUPL set)
RESET pin active HIGH.
t 15
CC
FCE685
(bit PRTL1 set)
Product specification
TDA8029