tda8031hl-c107 NXP Semiconductors, tda8031hl-c107 Datasheet - Page 32

• Manufacturer Part Number: tda8031hl-c107
• Description: Usb Smart Card Reader Otp Or Rom
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.3.4
When the session is completed, the microcontroller resets
START (t
deactivation sequence as follows:
1. Card reset (RST falls LOW; t
2. Clock (CLK) is stopped LOW (t
3. I/O, C4 and C8 fall to 0 V (t
4. V
5. The DC-to-DC converter is stopped and CLK, RST,
Thus:
2003 Jul 04
handbook, full pagewidth
t
t
t
t
t
t
USB smart card reader (OTP or ROM)
11
12
13
14
15
de
V
(t
15
CC
CC
= t
= t
= t
= t
= t
= time that V
).
, I/O, C4 and C8 become low-impedance to CGND
10
11
11
11
11
falls to 0 V with typical 0.17 V/ s slew rate (t
D
10
+
+
+ t
+
+
EACTIVATION SEQUENCE
). The circuit then executes an automatic
1
1
3
7
64
2
2
2
t
t
t
START
V UP
V CC
I/O
CLK
RST
t
CC
needs to decrease to less than 0.3 V.
t 0 t 1
13
11
)
)
12
)
t 2
Fig.9 Activation sequence.
t 3
14
)
t 4 = t act
32
Automatic emergency deactivation is performed in the
following cases:
1. Withdrawal of the card (PRES LOW)
2. Overcurrent detection on V
3. Overcurrent detection on RST (bit PRTL set)
4. Overheating (bit PTL set)
5. Supply too low (bit SUPL set)
6. RESET pin active HIGH.
In all of these cases, the deactivation sequence as
described above occurs.
If the reason for the deactivation is a card take-off, an
overcurrent or overheating, then INT0 will be LOW and the
corresponding bit in the Hardware Status Register will be
set. The START bit is automatically reset.
If the reason is a supply drop-out, then the deactivation
sequence occurs and a complete reset of the chip is
performed. When the supply recovers, then the SUPL bit
will be set in the HSR.
TDA8030; TDA8031
CC
(bit PRTL set)
ATR
Product specification
MGU889