MCP1321T-29ME/OT Microchip Technology, MCP1321T-29ME/OT Datasheet - Page 23

• Manufacturer Part Number: MCP1321T-29ME/OT
• Description: Active Low Open-drain + Active High P-P, WDI (WDI = 25.6s, Reset Delay = 200ms,
• Manufacturer: Microchip Technology
• Type: Simple Reset/Power-On Resetr

Specifications of MCP1321T-29ME/OT

• Number Of Voltages Monitored: 1
• Output: Open Drain, Push-Pull
• Reset: Active High/Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.9V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Monitored Voltage: 2 V to 4.7 V
• Undervoltage Threshold: 2.857 V
• Overvoltage Threshold: 2.944 V
• Output Type: Active High, Active Low, Open Drain, Push-Pull
• Manual Reset: Resettable
• Watchdog: Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 2240 ms
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Supply Current (typ): 10 uA
• Maximum Power Dissipation: 240 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP1321T-29ME/OTTR

4.0
For many of today’s microcontroller applications, care
must be taken to prevent low-power conditions that can
cause many different system problems. The most
common causes are brown-out conditions, where the
system supply drops below the operating level momen-
tarily. The second most common cause is when a
slowly
microcontroller to begin executing instructions without
sufficient voltage to sustain volatile memory (RAM),
thus producing indeterminate results.
a typical application circuit.
The MCP131X/2X family is voltage supervisor devices
designed to keep a microcontroller in Reset until the
system voltage has reached and stabilized at the
proper level for reliable system operation. These
devices also operate as protection from brown-out
conditions when the system supply voltage drops
below a safe operating level.
Some MCP131X/2X family members include a Watch-
dog Timer feature that after being enabled (by a falling
edge on the WDI pin), monitors the WDI pin for falling
edges. If an edge transition is not detected within the
expected timeframe, the MCP131X/2X devices will
force the Reset pin active. This is useful to ensure that
the embedded system’s Host Controller program is
operating as expected.
Some MCP131X/2X family members include a Manual
Reset feature that allows a push button switch to be
directly connected to the MCP131X/2X devices (on the
MR pin). This allows the system to easily be reset from
the external control of the push button switch.
A superset block diagram is shown in
device specific block diagrams shown in
through
© 2007 Microchip Technology Inc.
Figure
OPERATIONAL DESCRIPTION
decaying
4-12.
power
supply
Figure 4-1
Figure
causes
Figure 4-3
4-2, with
shows
the
FIGURE 4-1:
FIGURE 4-2:
MR
WDI
0.1
µF
Push button
switch
V
Note: Features available depend on the device.
Note 1: Resistor R
DD
2: Not all devices offer the active-high
MCP13XX
MR
MCP1320, MCP1321, or MCP1322 due
to the open-drain output.
Resistor R
the MCP1316M, MCP1318M, or
MCP1319M due to the internal pull-up
resistor.
The MCP1316, MCP1317, MCP1318,
and MCP1319 do not require the
external pull-up resistor.
Reset output pin.
+
–
V
V
Noise Filter
Watchdog
RST
Comparator
SS
DD
RST
Reference
Voltage
WDI
MCP131X/2X
(2)
Typical Application Circuit.
Family Block Diagram
V
PU
PU
To system
device that
requires active-
high resets
DD
may be required with the
may not be required with
R
PU
(1)
Output
Driver
Microcontroller
MCLR
(Reset input)
(active-low)
DS21985B-page 23
I/O
V
PIC
V
SS
DD
®
RST
RST
V
SS