tda8031hl-c107 NXP Semiconductors, tda8031hl-c107 Datasheet - Page 31

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tda8031hl-c107

Manufacturer Part Number
tda8031hl-c107
Description
Usb Smart Card Reader Otp Or Rom
Manufacturer
NXP Semiconductors
Datasheet
Philips Semiconductors
8.3
8.3.1
The correct sequence during activation and deactivation of
the cards is ensured through a specific sequencer, clocked
by a division ratio of the internal oscillator.
Activation (START bit HIGH in the Power Control Register)
is only possible if the card is present (PRES active HIGH)
and if the supply voltage is correct (supervisor not active).
The presence of the card is signalled to the microcontroller
by the Hardware Status Register (HSR).
Bit PRL in the HSR is set if the card is present. Bit PRL in
the HSR is set if bit PRL has toggled.
During a session, the sequencer performs an automatic
emergency deactivation on the card in the event of card
take off, a short-circuit, a supply drop-out or overheating.
When the HSR register is updated and the INT0 line goes
LOW, the microcontroller will also be updated.
8.3.2
The TDA8030; TDA8031 features the following protections
and limitations:
1. I
2. Current to and from RST is limited to 20 mA,
3. Deactivation when the temperature of the die exceeds
4. Current to and from the I/O is limited to 10 mA
5. Current to and from pin CLK is limited to 70 mA (not in
6. ESD protection on all cards contacts + PRES at
7. Short-circuit between any cards contacts can last any
2003 Jul 04
USB smart card reader (OTP or ROM)
reached
deactivated when this limit is reached
150 C
current reduction modes, when clock is stopped)
6 kV (min.), thus no need of extra components for
protection against ESD flash caused by a charged
card being introduced in the slot
duration without any damage.
CC
ISO7816 SECURITY
limited to 100 mA, deactivated when this limit is
I
P
NTRODUCTION
ROTECTIONS AND LIMITATIONS
31
8.3.3
When the card is inactive, V
are LOW, with low-impedance with referenced to CGND.
The DC-to-DC converter is stopped.
When everything is in normal conditions (no error flag set),
the microcontroller will initiate an activation sequence of
the card.
After leaving the UART reset mode and then configuring
the necessary parameters for the UART, the START bit in
the PCR (t
occurs:
1. The DC-to-DC converter is started (t
2. V
3. I/O, C4 and C8 rise to V
4. Clock pulses are sent to the card and RST is enabled
After a number of clock pulses that can be counted with the
Time-Out Counter, the bit RSTIN may be set by software
and RST will rise to V
The sequencer is clocked by
interval of t = 25 s typical.
Thus t
and t
controlled rise time of 0.17 V/ s typically (t
pull-up resistors connected to V
(t
4
4
CC
).
1
= t
= 0 to
starts rising from 0 to 5 V or 3 or 1.8 V with a
A
1
0
CTIVATION SEQUENCE
+ 5t.
) will be activated. The following sequence then
3
64
t, t
2
= t
CC
.
1
TDA8030; TDA8031
+
CC
5
CC
2
1
, CLK, RST, I/O, C4 and C8
t, t
64
(t
3
3
f
int
); integrated 10 k
= t
CC
which leads to a time
1
Product specification
+
9
1
)
2
t
2
)

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