STEVAL-IPT002V1 STMicroelectronics, STEVAL-IPT002V1 Datasheet - Page 22

• Manufacturer Part Number: STEVAL-IPT002V1
• Description: BOARD EVAL SMART CARD
• Manufacturer: STMicroelectronics

Specifications of STEVAL-IPT002V1

• Main Purpose: Memory, Smart Card
• Embedded: No
• Utilized Ic / Part: ST8024
• Primary Attributes: New Digital Systems (NDS) Compatible
• Secondary Attributes: Short-Circuit & Thermal Protection
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: ST8024
• Kit Application Type: Interface
• Application Sub Type: Smart Card Interface
• Kit Contents: Board CD Docs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8939

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detector are internally filtered, allowing spurious current pulses up to 200 mA with a duration
in the order of µs to be drawn by the card without causing deactivation. The average current
must stay below the specified maximum current value. For reasons of V
a 100 nF capacitor with an ESR < 100 mΩ should be tied to CGND near to pin V
nF capacitor with the same ESR should be tied to CGND near card reader contact C1.
Fault detection
The following fault conditions are monitored:
Depending on the type of card-present switch within the connector (normally-closed or
normally-open) and on the mechanical characteristics of the switch, bouncing may occur on
the PRES signals at card insertion or withdrawal.
There is a debounce feature in the device with an 8 ms typical duration (see
When a card is inserted, output OFF goes HIGH only at the end of the debounce time.
When the card is extracted, an automatic deactivation sequence of the card is performed on
the first true/false transition on PRES or PRES and output OFF goes LOW.
Figure 8.
– Short-circuit or high current on V
– Removal of a card during a transaction
– V
– DC-DC converter operating out of the specified values (V
– Overheating.
– There are two different cases (see
– CMDVCC HIGH outside a card session. Output OFF is LOW if a card is not in the
– CMDVCC LOW within a card session. Output OFF goes LOW when a fault condition
V
card reader, and HIGH if a card is in the reader. A voltage drop on the V
detected by the supply supervisor, this generates an internal Power-on reset pulse
but does not act upon OFF. No short-circuit or overheating is detected because the
card is not powered-up.
is detected. As soon as this occurs, an emergency deactivation is performed
automatically (see
may sense the OFF level again after completing the deactivation sequence. This
distinguishes between a hardware problem or a card extraction (OFF goes HIGH
again if a card is present).
DD
UP
too high)
dropping
Behavior of OFF, CMDVCC, PRES and V
Figure
9). When the system controller resets CMDVCC to HIGH it
CC
Figure
8):
CC
DDP
too low or current from
CC
voltage accuracy,
Figure
DD
CC
supply is
, and 100
8).