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TDA8007BHL/C4,118

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51
TDA8007BHL All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 9.1 — 18 June 2012 31 of 51
NXP Semiconductors
TDA8007BHL
Multiprotocol IC card interface
8.3 Supply
The TDA8007BHL/C4 operates within a supply voltage range of 2.7 V to 6 V. The supply
pins are V
DD
, V
DDA
, GND and AGND.
Pins V
DDA
and AGND supply the analog drivers to the cards and have to be decoupled
externally because of the large current spikes that the cards and the step-up converter
can create. V
DDA
may be different from V
DD
.
Pins V
DD
and GND supply the remainder of the chip. An integrated spike killer ensures
that the contacts to the cards remain inactive during power-up and power-down. An
internal voltage reference is generated for use within the step-up converter, the voltage
supervisor and the V
CC
generators.
The voltage supervisor generates an alarm pulse when V
DD
is too low to ensure proper
operation. The alarm pulse length is defined by an external capacitor tied to pin DELAY
and is typically 1 ms per 2 nF.
The alarm pulse may be used as a reset pulse by the system microcontroller
(pin RSTOUT = high). It can also be used to block any spurious noise on card contacts
during the microcontrollers reset, or to force an automatic deactivation of the contacts in
the event of a supply drop-out (see Section 8.5
and 8.7).
After power-on, or after a voltage drop, bit SUPL is set within register HSR and remains
set until register HSR is read-out outside the alarm pulse. Signal INT
= low for the
duration that signal RSTOUT is active.
Fig 17. voltage supervisor
V
th1
V
DD
V
th2
CDELAY
RSTOUT
SUPL
INT
Supply dropout Power-offReset by C
DELAY
Power-on
Status read
fce683
t
w
TDA8007BHL All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 9.1 — 18 June 2012 32 of 51
NXP Semiconductors
TDA8007BHL
Multiprotocol IC card interface
8.4 Step up converter
Except for the V
CC
generator and the other cards contacts buffers, the whole circuit is
powered by V
DD
, and V
DDA
. If the supply voltage is 2.5 V, then a higher voltage is needed
for the ISO contacts supply. When a card session is requested by the microcontroller, the
sequencer first enables the step-up converter (a switched capacitors type) which is
clocked by an internal oscillator at a frequency of approximately 2.5 MHz.
Supposing that V
CC
is the maximum of V
CC1
and V
CC2
, then the possible situations are:
• V
CC
=5V
– For V
DD
= 3 V the step-up converter acts as a voltage tripler with regulation of V
UP
at approximately 5.5 V
– For V
DD
= 5 V the step-up converter acts as a voltage doubler with regulation of
V
UP
at approximately 5.5 V
• V
CC
=3V
– For V
DD
= 3 V the step-up converter acts as a voltage doubler with regulation of
V
UP
at approximately 4.0 V
– For V
DD
= 5 V the step-up converter acts as a voltage follower and V
DD
is applied
to V
UP
• V
CC
=1.8V
– T he step-up converter acts as a voltage follower for any value of V
DD
.
The recognition of the supply voltage is done by the TDA8007BHL/C4 at approximately
3.5 V.
The output voltage V
UP
is fed to the V
CC
generators. V
CC
and GNDC are used as a
reference for all other card contacts.
8.5 ISO 7816 security
The correct sequence during activation and deactivation of the cards is ensured by two
specific sequencers, the clock is defined by a division ratio of the internal oscillator.
Activation (bit START = 1 in registers PCR1 or PCR2) is only possible if the card is
present (pin PRES is active high with an internal current source to ground) and if the
supply voltage is correct (voltage supervisor not active).
The presence of the cards is signalled to the microcontroller by register HSR. Bits PR1
or PR2 in register MSR are set if card 1 or 2 is present. Bits PRL1 or PRL2 are set if
pins PRES1 or PRES2 have been toggled.
During a session, the sequencer performs an automatic emergency deactivation on one
card in the event of card take-off, or short-circuit. Both cards are automatically deactivated
in the event of a supply voltage drop, or overheating. Register HSR is updated and the
INT
line falls so that the system microcontroller is aware of what happened.
TDA8007BHL All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 9.1 — 18 June 2012 33 of 51
NXP Semiconductors
TDA8007BHL
Multiprotocol IC card interface
8.6 Activation sequence
When the cards are inactive, pins V
CC
, CLK, RST, C4x, C8x 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
0
(see Figure 18)
1. The step-up converter is started (t
1
); if one card was already active, then the step-up
converter was already on and nothing more occurs at this step.
2. Pin V
CC
starts rising (t
2
) from 0 V to 3 V or 5 V with a controlled rise time of 0.17 V/µs
(typical).
3. Pin I/O rises to V
CC
(t
3
); pins C4x and C8x also rise if bits C4 and C8 within
register PCR have been set to logic 1 (integrated 14 k pull-up resistors to V
CC
).
4. Clock pulse CLK is sent to the card (t
4
) and pin RST is enabled.
5. After a number of CLK pulses that can be counted with the time-out counter,
bit RSTIN may be set by software and pin RST will then rise to V
CC
.
6. The sequencer is clocked by
1
⁄
64
f
int
which leads to a time interval of t = 25 µs (typical).
Thus:
t
1
=0to
1
⁄
64
t
t
2
=t
1
+
3
⁄
2
t
t
3
=t
1
+
7
⁄
2
t
4
=t
1
+4t.
Fig 18. Activation sequence
START
V
UP
V
CC
I/O
RSTIN
CLK
RST
t
0
t
2
t
3
t
4
= t
act
ATR
t
1
fce684
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51

TDA8007BHL/C4,118

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Manufacturer:
NXP Semiconductors
Description:
I/O Controller Interface IC 12bit 2-I/Os 5V
Lifecycle:
New from this manufacturer.
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