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參數(shù)資料
| 型號： | MCP131X |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Voltage Supervisor |
| 中文描述： | 電壓監(jiān)控 |
| 文件頁數(shù)： | 27/44頁 |
| 文件大?。?/td> | 924K |
| 代理商： | MCP131X |
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2005 Microchip Technology Inc.
DS21985A-page 27
MCP131X/2X
4.1.1
POWER-UP/RISING V
DD
As the device V
DD
rises, the device’s Reset circuit will
remain active until the voltage rises above the “actual”
trip point (V
TRIP
) plus the hysteresis (V
HYS
).
Figure 4-13 shows a power-up sequence and the
waveform of the RST and RST pins.
As the device powers up, the voltage will start below
the valid operating voltage of the device. At this volt-
age, the Reset output value is not valid. Once the volt-
age is above the minimum operating voltage (1V) and
below the selected V
TRIP
, the Reset output will be
active.
Once the device voltage rises above the “actual” trip
point (V
TRIP
) plus the hysteresis (V
HYS
), the Reset delay
timer (t
RST
) starts. When the Reset delay timer times
out, the Reset output (RST/RST) is driven inactive.
FIGURE 4-13:
Power-up.
Reset pin Operation on a
4.1.2
POWER-DOWN/BROWN-OUTS
As the device powers-down/brown-outs, the voltage
(V
DD
) falls from a voltage above the devices trip point
(V
TRIP
). The devices “actual” trip point voltage (V
TRIP
)
will be between the minimum trip point (V
TRIPMIN
) and
the maximum trip point (V
TRIPMAX
). Once the device
voltage (V
DD
) goes below this voltage, the Reset pin(s)
will be forced to the active state. There is a hysteresis
on this trip point. This is so that noise on the device volt-
age (V
DD
) does not cause the Reset pin (RST/RST) to
“jitter” (change between driving an active and inactive).
Figure 4-14 shows the waveform of the RST pin as
determined by the V
DD
voltage, while Table 4-1 shows
the state of the RST pin.
4.1.2.1
Operation of RST pin with Internal
Pull-Up Resistor
The internal pull-up resistor has a typical value of
4.7 k
Ω
. The internal pull-up eliminates the need for an
external resistor.
To reduce the current consumption of the device, when
the RST pin is driving low, the resistor is disconnected.
FIGURE 4-14:
RST
Operation as determined by the V
TRIP
and V
HYS
.
Note:
While the Reset delay timer (t
RST
) is
active, additional system current is con-
sumed.
V
TRIPMAX
V
TRIPMIN
1V
V
TRIP
V
DD
V
TRIP
+ V
HYS
t
RST
RST
RST
Note:
Only the MCP1316M, MCP1318M and
MCP1319M devices have an open-drain
RST output pin with an internal pull-up
resistor.
V
DD
V
TRIPMAX
V
TRIPMIN
V
TRIP
V
TRIP
V
TRIP
+ V
HYS
RST
1V
< 1V is outside the
device specifications
t
RPD
t
RST
t
RPD
t
RST
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