17
D027173_07 CR821X Dual Board Decoded Scan Engine Integration Guide
Notes:
Trigger can also be used to wake unit.
4.8 – Power Down Timing Diagram
4.9 – Sleep to Wakeup Timing Diagram
Power (
V
in
) can be removed at any time except
when the unit is performing an upgrade.
Removing power during an upgrade may
cause the unit to become unusable.
Parameter
Symbol
Min
Typical
Max
Unit
Note
Time from Power Off to
all outputs low
TPD1
0.62
msec
Signal
Description
Min
Typical
Max
Unit
T
wUpw
nWakeUp pulse width
10
10
msec
T
wU
Time between nWakeUp asserted and
CR822x ready
10
11
TBD
msec
T
ready
Time between CR822x ready and when
nTrigger can be asserted
0
0
TBD
msec
T
decode
Time between nTrigger asserted and
nGoodRead asserted (decode time)
99
msec
T
grpw
nGoodRead pulse width
Programmable
T
TimeoUT
Time between data transfer and sleep state
Programmable
msec
T
WUPW
nWakeUp
T
SU
T
WU
PwrDwn
5V
0V
V
IN
5V
0V
Outputs
TPD1
Outputs: PwrDwn, nGoodRead, nBeeper
