Datasheet

Functional description ST8024L
26/35 Doc ID 17709 Rev 5
Figure 9. Emergency deactivation sequence (card extraction)
6.11 V
CC
selection settings
The ST8024L supports three smartcard V
CC
voltages: 1.8 V, 3 V, and 5 V. The V
CC
selection
is controlled by the 1.8V and 5V/3
V signals as shown in Table 23. The 1.8V signal has
priority over the 5V/3
V. When the 1.8 V pin is taken high, V
CC
is 1.8 V and it overrides any
setting on the 5V/3
V pin.
When the 1.8V pin is taken low, the 5V/3
V pin selects the 5 V or 3 V V
CC
. If the 5V/3V pin is
taken high, then V
CC
is 5 V, and if the 5V/3V pin is taken low then V
CC
is 3 V.
Table 23. V
CC
selection settings
5V/3V pin 1.8V pin V
CC
output
00 3 V
10 5 V
x1 1.8 V