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ST72411R Fiches technique(PDF) 47 Page - STMicroelectronics

No de pièce ST72411R
Description  8-BIT MCU WITH SMARTCARD INTERFACE, LCD DRIVER, 8-BIT TIMER, SAFE RESET AND SUPPLY MONITORING
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72411R Fiches technique(HTML) 47 Page - STMicroelectronics

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SMARTCARD SUPPLY SUPERVISOR (Cont’d)
5.5.4 Functional Description
The core of the SSS is the internal reference volt-
age generator that is used for the output voltage
level regulation and for the Current Overload de-
tection.
Output regulation is achieved from the MCU VDD
with a follower transistor used as output stage, as-
sociated to a feedback regulation.
Software control through the Status/Control regis-
ter allows software to:
s
Turn-on / turn-off the SSS
s
Enable the overload detector
s
Enable interrupt in case of overload
Smartcard Power Supply
When disabled, the whole SSS is stopped in order
to achieve minimum consumption. The SC_PWR
line is tied to ground, and the I/O lines supplied by
SC_PWR, are also tied to ground.
When the SSS module is enabled, the SC_PWR
line provides a regulated voltage to the smartcard,
and the I/O lines have a logic “1” level identical to
the smartcard supply ensuring a safe interface.
Current Overload protection
When a current overload occurs on the SC_PWR
supply output, SC_PWR level drop is detected by
the Current Overload detector when enabled. As a
consequence, the SSS is turned-off with the
SC_PWR line tied to ground and the SSSEN bit is
cleared. On top of that, the OVLD flag is set into
the Status/Control Register and an interrupt re-
quest can be initiated.
Note: The Current Overload detector must be en-
abled by setting OVLDEN bit only after setting the
SSSEN bit.
Figure 37. Current Overload Detection
Switching SC_PWR from 3V to 5V output and
vice versa
The usual (and safe) procedure is to test the card
at 3V before selecting 5V output.
The application should avoid making a direct tran-
sition from 5V to 3V as a delay is required before
the 3V level is reached (the delay depends on the
external capacitor and card type).
For a controlled transition from 5V to 3V it is rec-
ommended to clear the SSSEN bit to tie the
SC_PWR to ground before enabling 3V output.
See Figure 52.
Figure 38. Recommended transitions when switching the voltage regulator (SSSR bit).
ISC_PWR
0mA
0V
SHORT CIRCUIT
VOVLD
OVLDF FLAG
VSC_PWR
0V
VSC_PWR
3V
5V
SSSR =0
SSSEN=1
SSSR=1
SSSEN=1
SSSR=1
SSSEN= 0
SSSR=0
SSSEN=1
t


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