Datasheet

Functional description ST8024L
24/35 Doc ID 17709 Rev 5
Figure 7. Deactivation sequence
6.9 V
CC
generator
The V
CC
generator has a capacity to supply up to 80 mA (max.) continuously at 5 V,
65 mA (max.) at 3 V, and 45 mA (max.) at 1.8 V. An internal overload detector operates at
approximately 120 mA. Current samples to the 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
CC
voltage accuracy, a 100 nF capacitor with an
ESR < 350 mΩ should be tied to CGND near to pin V
CC
, and a 100 nF capacitor with the
same ESR should be tied to CGND near card reader contact C1.