manual: low power mode and D11 description

pull/3/head
emard 6 years ago
parent 1a04c97f7d
commit 5c7ad710c0

@ -126,15 +126,19 @@ There is SHUTDOWN pin where FPGA can turn OFF the board.
This pin is not correctly routed on PCB v1.7 and needs
hardware upgrade to make it work.
When board is ready to accept SHUTDOWN signal, LED D11
(found on back side of the board near J1 pin 22) should
When RTC has 3V battery and its registers for current time,
alarm time and alarm logic are configured to trigger
RTC ALARM in the future, the board is ready to accept
SHUTDOWN signal, which is indicated when LED D11
(found on back side of the board near J1 pin 22) is
be very dimly lit, visible in the dark.
While D11 is dimly lit, power down
board by setting SHUTDOWN signal to 1
(or shortly and carefully connect 1k resistor between SHUTDOWN pin of R13
and 3.3V).
When RTC ALARM is triggered, board should turn ON and D11 should be OFF
indicating board can't enter SHUTDOWN until RTC ALARM flag is cleared.
While D11 is dimly lit, board can be powered down by setting SHUTDOWN
signal to 1 from FPGA logic or by shortly and carefully connecting 1k
resistor between SHUTDOWN pin of R13 and 3.3V.
When RTC ALARM is triggered, board should turn ON. When D11 is OFF,
it is indicating that board can't enter SHUTDOWN, probably RTC ALARM
flag has to be cleared or other RTC registers configured.
On J2 connector there are 2 pins for 5V external power input
and output. They are located on top right, near pin labeled 27

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