User guide

WA_DEV_FEX20_UGD_002 Rev 004 March 08, 2011 54
Fastrack Xtend User Guide
Signals and Indicators
When used (as an emergency reset), it has to be driven by either an open collector or an open drain
output.
Caution: This signal is for emergency resets only.
Table 37. Fastrack Xtend Reset Status
(Serial
Port) Pin #
Signal
I/O
I/O Type
Voltage
Description
14
Reset
I/O
Open drain
1V8
Fastrack Xtend Reset
Table 38. Reset Electrical Characteristics
Parameter
Minimum
Typical
Maximum
Unit
Input Impedance (R)*
100.3
k
Input Impedance (C)
40
nF
* Internal pull-up
Table 39. Reset Operating Conditions
Parameter
Minimum
Typical
Maximum
Unit
~Reset time (Rt)
1
200
µs
~Reset time (Rt)
2
(at power up only)
20
40
100
ms
Cancellation time (Ct)
34
ms
V
H
*
0.57
V
V
IL
0
0.57
V
V
IH
1.33
V
* V
H
= Hysterisis Voltage
1: This reset time is the minimum to be carried out on the ~Reset signal when the power supply is stabilized.
2: This reset time is internally carried out by the embedded module power supply supervisor only when the
embedded module power supplies are powered ON.