DS_8024C_023

73S8024C Data Sheet

Rev. 1.3

11

Figure 5: Deactivation Sequence

10

OFF and Fault Detection

There are two cases for which the system controller can monitor the

OFF signal: to query regarding the

card presence outside card sessions, or for fault detection during card sessions.

Monitoring Outside a Card Session

In this condition,

CMDVCC is always high, OFF is low if the card is not present, and high if the card is

present. Because it is outside a card session, any fault detection will not act upon the

OFF signal. No

deactivation is required during this time.

Monitoring During a Card Session

CMDVCC is always low, and OFF falls low if the card is extracted or if any fault is detected. At the same

time that

OFF is set low, the sequencer starts the deactivation process.

Figure 6 shows the timing diagram for the

CMDVCC, PRES, and OFF signals during a card session and

outside the card session.

PRES

OFF

CMDVCC

VCC

outside card session

within card session

OFF is low by

card extracted

OFF is low by

any fault

within card

session

Figure 6: Timing Diagram – Management of the Interrupt Line

OFF

≥ 0.5 µs, timing by 1.5 MHz internal Oscillator

≥ 7.5 µs

≥ 0.5 µs

≥ 0.5 µs

RST

CLK

I/O

VCC

CMDVCC

-- OR --

OFF