Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
3.18 LED Signal
3.18.1 Features
LED is an open collector output from a PNP transistor. The user must implement
some form of transistor circuit to drive the LED.
When the Q64 is ON, this output is used to indicate the network status.
LED status
Q64 VCC status LED status Q64 status
state
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WA_DEV_Q64_PTS_001-003 January 9, 2009
Permanent Q64 switched ON, not
registered on the network
Q64 ON VCC > 3.2V
Slow flash
LED ON for 200 ms,
OFF for 2 s
Q64 switched ON,
registered on the network
Quick flash
LED ON for 200 ms,
OFF for 600 ms
Q64 switched ON,
registered on the network,
communication in progress
Very quick flash Q64 switched on, software
downloaded is either
corrupted or non-
compatible ("BAD
SOFTWARE")
LED ON for 100ms, OFF
for 200ms
Electrical characteristics of the signal
Parameter Condition Minimum Typ Maximum Unit
VOH 2.8 V
IOUT 7 mA
The LED state is high during the RESET time and undefined during the software
initialization time. During software initialization time, during 2 seconds max after
RESET cancellation, the LED signal is toggling and it does not provide the Q64 status.
After 2 seconds, the LED provides the true status of the Wireless CPU
®
.