Echelon FT 3150 Smart Transceiver User Manual
Page 74

Chapter 3 - Input/Output Interfaces
68
FT 3120 / FT 3150 Smart Transceiver Data Book
Figure 3.33 Touch I/O Object
The leveldetect input object can be used for detection of asynchronous attachments of Touch Memory devices to the
FT Smart Transceiver. In such a case, the leveldetect input object is overlaid on top of the Touch I/O object. Refer to
the Neuron C Programmer’s Guide for information on I/O object overlays.
Symbol
Description
Min
Typ
Max
t
rsto
Reset call to data line low
—
60.0 µs
—
t
rstl
Reset pulse width
—
500 µs
—
t
pdh
Reset pulse release to data line high
10MHz
5MHz
4.8 µs
9.6 µs
—
—
275 µs
275 µs
t
pdl
Presence pulse width
—
120.0 µs
—
t
wh
Data line high detect to presence pulse
—
80 µs
—
t
rret
Return from reset function
—
12.6 µs
—
t
f
I/O call to data line low (start of bit slot)
—
125.4 µs
—
t
low
Start pulse width
10MHz
5MHz
—
—
4.2 µs
8.4 µs
—
—
t
rdi
Start pulse edge to sampling of input (read operation)
10MHz
5MHz
—
—
15.0 µs
18.0 µs
—
—
t
wrd
Start pulse edge to FT Smart Transceiver releasing the data line
10MHz
5MHz
—
—
66.6 µs
72.0 µs
—
—
t
ibd
Inter-bit delay
10MHz
5MHz
—
—
61.2 µs
122.4 µs
—
—
t
ret
Return from I/O call
—
42.6 µs
—
TIME
DATA LINE
t
rsto
START OF
touch_reset()
INPUT
SAMPLED
t
pd
t
pdl
t
rret
NEXT
io_in() OR
io_out()
TIME
START OF io_in() OR
io_out()
INPUT
SAMPLED
t
f
END OF
io_in() OR
io_out()
t
low
t
ibd
t
wrd
t
rdi
t
ret
DATA LINE
DATA LINE
DATA LINE
RESET
AND
PRESENCE
WRITE 1
WRITE 0
READ
FT Smart Transceiver
TOUCH MEMORY
PULL-UP RESISTOR
LINE TYPE LEGEND
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
END OF
touch_reset()
t
rstl
t
wh
High Current Sink Drivers