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SP813LEP-L/TR датащи(PDF) 12 Page - Exar Corporation

номер детали SP813LEP-L/TR
подробное описание детали  Low Power Microprocessor Supervisory Circuits
PDF  18 Pages
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производитель  EXAR [Exar Corporation]
домашняя страница  http://www.exar.com
Logo EXAR - Exar Corporation

SP813LEP-L/TR датащи(HTML) 12 Page - Exar Corporation

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OCT 17-06 RevB
SP705 Low Power Microprocessor Supervisory Circuits
© 2008 Exar Corporation
12
sensitivity to high-frequency noise on the
line being monitored. RESET can be used to
monitor voltages other than the +5V V
CC
line. Connect PFO to MR to initiate a RESET
pulse when PFI drops below 1.25V. Figure 17
shows the SP705/706/707/708 configured to
assert RESET when the +5V supply falls below
the RESET threshold, or when the +12V supply
falls below approximately 11V.
Monitoring a Negative Voltage Supply
The power-fail comparator can also monitor a
negative supply rail, shown in Figure 18. When
the negative rail is good (a negative voltage of
large magnitude), PFO is LOW. By adding the
resistors and transistor as shown, a HIGH PFO
triggers RESET. As long as PFO remains HIGH,
the SP705-708/813L will keep RESET
asserted (where RESET = LOW and RESET =
HIGH). Note that this circuit's accuracy de-
pends on the PFI threshold tolerance, the V
CC
line, and the resistors.
Figure 18. Monitoring a Negative Voltage Supply
Figure 19. Interfacing to Microprocessors with
Bidirectional RESET I/O for the SP705/706/707/708
Interfacing to mPs with Bidirectional
RESET Pins
µPs with bidirectional RESET pins, such as the
Motorola 68HC11 series, can contend with the
SP705/706/707/708 RESET output.
If, for
example, the RESET output is driven HIGH and
the
µP wants to pull it LOW, indeterminate
logic levels may result. To correct this, connect
a 4.7K
Ω resistor between the RESET output and
the
µP reset I/O, as shown if Figure 19. Buffer
the RESET output to other system components.
VCC
+5V
GND
VCC
+5V
GND
RESET
RESET
4.7K
Ω
µP
Buffered RESET connects to System Components
PFI
PFO
R2
R1
VCC
+5V
GND
PFO
V-
+5V
VTRIP
0V
0V
5.0 - 1.25
R1
1.25 - VTRIP
R2
V-
=
10K
Ω
10K
Ω
RESET
to
µP
2N3904
, VTRIP < 0
V-
MR
0V
+5V
MR
100K
Ω
100K
Ω



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