MCP1321T-29LE/OT Microchip Technology, MCP1321T-29LE/OT Datasheet - Page 32

• Manufacturer Part Number: MCP1321T-29LE/OT
• Description: IC SUPERVISOR 2.9V OD/PP SOT23-5
• Manufacturer: Microchip Technology
• Type: Simple Reset/Power-On Resetr

Specifications of MCP1321T-29LE/OT

• Number Of Voltages Monitored: 1
• Package / Case: SOT-23-5, SC-74A, SOT-25
• 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
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Output Type: Active High or Active Low or Open Drain or Push-Pull
• Power Fail Detection: No
• Monitored Voltage: 2 V to 4.7 V
• Undervoltage Threshold: 2.857 V
• Overvoltage Threshold: 2.944 V
• Manual Reset: Resettable
• Watchdog: Yes
• Battery Backup Switching: No
• 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
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Input Voltage: 5.5V
• No. Of Outputs: 1
• Power Dissipation Pd: 240mW
• Supply Voltage Range: 1V To 5.5V
• No. Of Pins: 5
• Operating Temperature Range: -40°C To +125°C
• Filter Terminals: SMD
• Supply Voltage Min: 1V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP1321T-29LE/OT; MCP1321T-29LE/OTTR

MCP131X/2X
5.4
Although the MCP131X/2X device has a fixed voltage
trip point (V
custom adjustments. This can be accomplished by
connecting an external resistor divider to the
MCP131X/2X V
age to be at a higher voltage than when the MCP131X/
2X input equals its V
To maintain detector accuracy, the bleeder current
through the divider should be significantly higher than
the 10 µA maximum operating current required by the
MCP131X/2X. A reasonable value for this bleeder
current is 1 mA (100 times the 10 µA required by the
MCP131X/2X). For example, if V
desired trip point is 2.5V, the value of R
(2.5V/1 mA). The value of R
the nearest standard value and plugged into the equa-
tion of
tolerance resistors are recommended.
FIGURE 5-5:
External Resistor Divider.
DS21985B-page 32
Where:
Note:
V
V
R
R
SOURCE
Figure 5-5
SOURCE
2
1
V
Modifying The Trip Point, V
TRIP
V
TRIP
SOURCE
In this example, V
greater than (V
V
DD
= Voltage to be monitored
= Threshold Voltage setting
), it is sometimes necessary to make
DD
to calculate values for R
pin. This causes the V
TRIP
MCP131X/2X
V
×
Modify Trip-Point using
SS
voltage
------------------- -
R
1
R
1
+
TRIP
1
+ R
R
2
)
(Figure
2
=
SOURCE
TRIP
can be rounded to
V
RST
or RST
TRIP
1
= 2V and the
+ R
5-5).
1
SOURCE
and R
must be
2
TRIP
is 2.5 kΩ
2
. 1%
volt-
5.5
Low operating power and small physical size make the
MCP131X/2X series ideal for many voltage detector
applications.
protection circuit that prevents overheating of the logic-
level MOSFET due to insufficient gate voltage. When
the input signal is below the threshold of the MCP131X/
2X, its output grounds the gate of the MOSFET.
FIGURE 5-6:
Protection.
5.6
In some low-power applications, the longer that the
microcontroller (such as a PIC MCU) can be in the
“Sleep mode”, the lower the average system current
consumption will be.
The WDT feature can be used to “wake-up” the PIC MCU
at a regular interval to service the required tasks before
returning to sleep. This “wake-up” occurs after the PIC
MCU detects a MCLR reset during Sleep mode (for mid-
range family; POR = ‘1’, BOR = ‘1’, TO = ‘1’, and PD = ‘1’).
MCP131X/2X
MOSFET Low-Drive Protection
Low-Power Applications
Figure 5-6
V
TRIP
V
V
SS
DD
270Ω
MOSFET Low-Drive
© 2007 Microchip Technology Inc.
shows a low-voltage gate drive
RST
V
DD
MTP3055EL
R
L