AN1978 STMicroelectronics, AN1978 Datasheet - Page 12

• Manufacturer Part Number: AN1978
• Description: ST8004: SMART CARD INTERFACE
• Manufacturer: STMicroelectronics

AN1978 - APPLICATION NOTE
Figure 16: Short-circuit on Vcc during the activation.
Figure 17: Short-circuit on Vcc after the activation.
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Conditions:
Conditions:
Conditions:
V
V
V
V
V
V
5/3V=H
5/3V=H
5/3V=H
CH1: Vcc
CH1: Vcc
CH1: Vcc
CH2: CMDVCC.
CH2: CMDVCC.
CH2: CMDVCC.
CH3: RST .
CH3: RST .
CH3: RST .
CH4 : Vcc output current
CH4 : Vcc output current
CH4 : Vcc output current
In this case the short
In this case the short
In this case the short
circuit
circuit
circuit
activation sequence then
activation sequence then
activation sequence then
the automatic deactivation
the automatic deactivation
the automatic deactivation
starts after about 8µs.
starts after about 8µs.
starts after about 8µs.
DD
DD
DD
DDP
DDP
DDP
Conditions:
Conditions:
Conditions:
V
V
V
V
V
V
5/3V=H.
5/3V=H.
5/3V=H.
CH1: Vcc
CH1: Vcc
CH1: Vcc
CH2: CMDVCC.
CH2: CMDVCC.
CH2: CMDVCC.
CH3: RST .
CH3: RST .
CH3: RST .
CH4 : Vcc output current
CH4 : Vcc output current
CH4 : Vcc output current
In this case the short circuit
In this case the short circuit
In this case the short circuit
is
is
is
during
during
during
sequence,
sequence,
sequence,
automatic
automatic
automatic
starts as soon as the fault
starts as soon as the fault
starts as soon as the fault
is acknowledged.
is acknowledged.
is acknowledged.
DD
DD
DD
DDP
DDP
DDP
= 3V
= 3V
= 3V
=4.75V;
=4.75V;
=4.75V;
= 3V
= 3V
= 3V
present
present
present
=4.75V;
=4.75V;
=4.75V;
acts
acts
acts
the
the
the
after
after
after
before
before
before
then
then
then
deactivation
deactivation
deactivation
activation
activation
activation
the
the
the
and
and
and
the
the
the