STEVAL-IPT002V1 STMicroelectronics, STEVAL-IPT002V1 Datasheet - Page 16

• 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
5.1
5.2
5.2.1
16/31
Functional description
Throughout this document it is assumed that the reader is familiar with ISO7816
terminology.
Power supply
The supply pins for the IC are V
signals interfacing with the system controller are referred to V
supply the system controller. All card reader contacts remain inactive during power-on or
power-off.
The internal circuits are maintained in the reset state until V
the duration of the internal power-on reset pulse, t
V
A DC-DC converter is incorporated to generate the 5 or 3 V card supply voltage (V
DC-DC converter should be supplied separately by V
of large transient currents, the two 100 nF capacitors of the DC-DC converter should be
located as near as possible to the IC and have an ESR less than 100 mΩ.
The DC-DC converter functions as a voltage doubler or a voltage follower according to the
respective values of V
The DC-DC converter function changes as follows:
V
V
V
V
Supply voltages V
After powering the device, OFF remains LOW until CMDVCC is set HIGH.
During power off, OFF falls LOW when V
Voltage supervisor
Without external divider on pin PORADJ
The voltage supervisor surveys the V
(t
(see
As long as V
command lines. This state also lasts for the duration of t
higher than V
contacts is performed.
W
th2
CC
CC
CC
CC
) is used internally to keep the IC inactive during power-on or power-off of the V
, an automatic deactivation of the contacts is performed.
= 5 V and V
= 5 V and V
= 3 V and V
= 3 V and V
Figure
4).
DD
th2
is less than V
DDP
DDP
DDP
DDP
+ V
DD
hys2
> 5.8 V; voltage follower
< 5.7 V; voltage doubler
> 4.1 V; voltage follower
< 4.0 V; voltage doubler.
and V
CC
. When V
and V
DDP
th2
DDP
may be applied to the IC in any sequence.
DD
+ V
DD
and GND. V
(both have thresholds with a hysteresis of 100 mV).
hys2
falls below V
DD
, the IC remains inactive whatever the levels on the
supply. A defined reset pulse of approximately 8 ms
DD
is below the falling threshold voltage.
DD
th2
W
should be in the range of 2.7 to 6.5 V. All
, a deactivation sequence of the
(see
DDP
W
Figure
and PGND. Due to the possibility
after V
DD
DD
reaches V
, therefore V
4). When V
DD
has reached a level
th2
DD
DD
+V
hys2
falls below
should also
DD
CC
and for
supply
). The