STEVAL-IPT002V1 STMicroelectronics, STEVAL-IPT002V1 Datasheet - Page 21

• 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

5.7
5.8
5.9
Active mode
When the activation sequence is completed, the ST8024 will be in its active mode. Data are
exchanged between the card and the microcontroller via the I/O lines.
The ST8024 is designed for cards without V
internal non-volatile memory).
Deactivation sequence
When a session is completed, the microcontroller sets the CMDVCC line HIGH. The circuit
then executes an automatic deactivation sequence by counting the sequencer back and
finishing in the inactive mode (see
1. RST goes LOW (t
2. CLK is held LOW (t
oscillator (approximately 25 µs).
3. I/O, AUX1 and AUX2 are pulled LOW (t
4. V
5. The deactivation sequence is complete at t
6. V
I/OUC, AUX1UC and AUX2UC remain at V
7. The internal oscillator returns to its lower frequency.
Figure 7.
V
The V
V. An internal overload detector operates at approximately 120 mA. Current samples to the
CC
CC
UP
CC
generator
falls to zero (t
starts to fall towards zero (t
generator has a capacity to supply up to 80 mA continuously at 5 V and 65 mA at 3
Deactivation sequence
10
15
12
).
= t
= t
10
10
+ 5T) and all card contacts become low-impedance to GND;
+ 0.5 x T) where T is 64 times the period of the internal
14
Figure
= t
10
7):
13
+ 1.5 x T).
DD
PP
= t
de
(pulled-up via a 11 kΩ resistor).
(the voltage required to program or erase the
10
, when V
+ T).
CC
reaches its inactive state.
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