tda8007bhl/c3 NXP Semiconductors, tda8007bhl/c3 Datasheet - Page 32

• Manufacturer Part Number: tda8007bhl/c3
• Description: Double Multiprotocol Ic Card Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.6
When the cards are inactive, pins V
and I/O are at LOW level and have a low-impedance with
respect to ground. The step-up converter is stopped.
When everything is satisfactory (voltage supply, card
present and no hardware problems), the system
microcontroller may initiate an activation sequence of a
present card.
After selecting the card and leaving the UART reset mode,
and then configuring the necessary parameters for the
counters and the UART, bit START can be set within
register PCR at t
1. The step-up converter is started (t
2. Pin V
2003 Feb 18
handbook, full pagewidth
Double multiprotocol IC card interface
already active, then the step-up converter was already
on and nothing more occurs at this step.
controlled rise time of 0.17 V/ s (typical).
Activation sequence
CC
starts rising (t
START
RSTIN
V CC
V UP
RST
CLK
0
I/O
(see Fig.14):
2
) from 0 to 3 or 5 V with a
t 0
t 1
CC
t 2
, CLK, RST, C4, C8
1
); if one card was
Fig.14 Activation sequence.
t 3
t 4 = t act
32
3. Pin I/O rises to V
4. Clock pulse CLK is sent to the card (t
5. After a number of CLK pulses that can be counted with
6. The sequencer is clocked by
Thus:
t
t
t
t
1
2
3
4
bits C4 and C8 within register PCR have been set to
logic 1 (integrated 14 k pull-up resistors to V
enabled.
the time-out counter, bit RSTIN may be set by
software and pin RST will then rise to V
time interval of t = 25 s (typical).
= 0 to
= t
= t
= t
1
1
1
+
+
+ 4t.
3
7
1
2
2
64
t
t
t
CC
(t
3
); pins C4 and C8 also rise if
1
ATR
64
FCE684
f
Product specification
int
TDA8007B
which leads to a
4
) and pin RST is
CC
.
CC
).