Symbol SE 2223, Руководство по интеграции

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8-4
SE 2223/3223 Scan Engine Integration Guide
Timing Waveforms
Explanation Of The AC Symbols
Each timing symbol has five characters. The first character is always “t.” The other
characters indicate the name of the signal or the logical status of that signal. Designations
are:
a = WKUP*
b = BPR
c = Host CTS
d = PWRDWN
e = PWREN
f = float, fall time
g = trigger
h = logic level high
l = logic level low
pm = minimum voltage level
r = Host RTS
tw = time duration
v = Host RXD
w = width
x = Host TXD
Example:
tbltw = Beeper drive low time
trlcl = Time for RTS low to CTS low
AC Test Points
Note: AC inputs during testing are driven at V
BATT
-0.5 for logic “1” and
0.45 for logic “0.” Timing measurements are made at 0.2 V
BATT
+0.9 and 0.2 V
BATT
-0.1.
V
BATT
- 0.5
0.45 V
0.2 V
BATT
+ 0.9
0.2 V
BATT
- 0.1