參數(shù)資料
型號(hào)： MCP1319M
廠商： Microchip Technology Inc.
英文描述： Voltage Supervisor
中文描述： 電壓監(jiān)控
文件頁(yè)數(shù)： 33/44頁(yè)
文件大?。?/td> 924K
代理商： MCP1319M
2005 Microchip Technology Inc.
DS21985A-page 33
MCP131X/2X
5.7
Controllers and Processors With
Bidirectional I/O Pins
Some microcontrollers have bidirectional Reset pins.
Depending on the current drive capability of the control-
ler pin, an indeterminate logic level may result if there
is a logic conflict. This can be avoided by adding a
4.7 k
Ω
resistor in series with the output of the
MCP131X/2X (Figure 5-7). If there are other compo-
nents in the system that require a Reset signal, they
should be buffered so as not to load the Reset line. If
the other components are required to follow the Reset
I/O of the microcontroller, the buffer should be con-
nected as shown with the solid line.
FIGURE 5-7:
MCP131X/2X Push-Pull outputs to a
Bidirectional Reset I/O.
Interfacing the
5.8
RESET Signal Integrity During
Power-Down
The MCP131X/2X Reset output is valid to V
DD
= 1.0V.
Below this 1.0V, the output becomes an "open circuit"
and does not sink or source current. This means
CMOS logic inputs to the microcontroller will be floating
at an undetermined voltage. Most digital systems are
completely shut down well above this voltage.
However, in situations where the Reset signal must be
maintained valid to V
DD
= 0V, external circuitry is
required.
For devices where the Reset signal is active-low, a
pull-down resistor must be connected from the
MCP131X/2X Reset pin(s) to ground to discharge stray
capacitances and hold the output low (Figure 5-8).
Similarly for devices where the Reset signal is
active-high, a pull-up resistor to V
DD
is required to
ensure a valid high Reset signal for V
DD
below 1.0V.
This resistor value, though not critical, should be
chosen such that it does not appreciably load the Reset
pin(s) under normal operation (100 k
Ω
will be suitable
for most applications).
FIGURE 5-8:
Reset pin output state as
V
DD
approaches 0V.
Ensuring a valid active-low
MCP13XX
V
DD
RST
GND
MCLR
GND
Buffered Reset
To Other System
Components
MCU
4.7 k
Ω
Buffer
PICmicro
MCP13XX
V
DD
V
DD
R
1
100 k
Ω
RST
GND
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