DocID024511 Rev 2

19/31

ST8034HN, ST8034HC

Functional description

6

Functional description

Throughout this document it is assumed that the reader is familiar with ISO7816

terminology.

6.1

Power supplies

remain inactive during power-up or power-down. After powering up the device, OFF output

remains low until CMDVCC input is set high and PRES input is low. During power-down,

card is not activated (CMDVCC input is high), the internal oscillator is in low frequency

mode to reduce power consumption.

Power-on sequence: supply voltages may be applied to the ST8034 in any sequence.

6.2

Voltage supervisor