ST8004 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST8004' PDF : 26 Pages View PDF
ST8004
Functional description
When OFF level falls low, the system controller must wait not less than 160µs before setting
high again the CMDVCC command.
Depending on the type of card presence switch within the connector (normally closed or
normal open), and on the mechanical characteristics of the switch, a bouncing may occur on
presence signals at card insertion or withdrawal. There is no debounce feature in the device,
so the software has to take it into account; however, the detection of card take off during
active phase, which initiates an automatic deactivation sequence is done on the first
True/False transition on PRES or PRES, and is memorized until the system controller sets
CMDVCC High. So, the software may take some time waiting for presence switches to be
stabilized without causing any delay on the necessary fast and normalized deactivation
sequence.
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