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S42 Hardware User Guide
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Page 47 of 62
5.7
Power-Up Time
The time until the S42is able to accept link requests or serial data depends on the
firmware version and on the source for the slow clock. Using TIO firmware version , the
device is ready (as indicated by GPIO IOA, measured from the release of EXT_RES# or
VSUP rising above 1,7V) as follows:
•
t
DeviceReady
0,9s (typ.) if an external 32,768kHz crystal is connected.
•
t
DeviceReady
1,7s (typ.) if no external signal is provided so the internal RC is used.