MCP2122 Microchip Technology, MCP2122 Datasheet - Page 6
MCP2122
Manufacturer Part Number
MCP2122
Description
Converts serial data from UART bitstreams to IrDA standard bitstreams (encodes) and from IrDA standard bitstreams to UART bitstreams ...
Manufacturer
Microchip Technology
Datasheet
1.MCP2122.pdf
(34 pages)
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MCP2122
2.3.1
Some applications may subject the MCP2122 to a
brown-out condition. Good design practice requires
that when a system is in brown-out, the system should
be in reset to ensure that the system is in a known
state when the system exits the brown-out. This
brown-out circuitry is external to the MCP2122.
2.3.1.1
Figure 2-2 shows a circuit for external brown-out
protection using the TCM809 device.
Figure 2-3 and Figure 2-4 illustrate two examples of
external circuitry that may be implemented. Each
option needs to be evaluated to determine if they
satisfy the requirements of the application.
FIGURE 2-2:
FIGURE 2-3:
DS21894B-page 6
V
Note 1: Resistors should be adjusted for the
DD
33 k
TCM809
2: This circuit will activate reset when
BROWN-OUTS
V
External Brown-Out Reset Circuits
DD
RST
characteristics of the transistor.
V
where Vz = Zener voltage.
DD
V
SS
10 k
goes below (Vz + 0.7V),
40 k
EXTERNAL BROWN-OUT
PROTECTION USING THE
TCM809
EXTERNAL BROWN-OUT
PROTECTION CIRCUIT 1
Q1
MCP2122
RESET
V
DD
V
MCP2122
RESET
DD
Preliminary
FIGURE 2-4:
Note 1: This circuit is less expensive, but
R1
R2
V
2: Resistors should be adjusted for the
DD
less accurate. Transistor Q1 turns
off when V
such that:
characteristics of the transistor.
V
40 k
DD
PROTECTION CIRCUIT 2
•
EXTERNAL BROWN-OUT
2004 Microchip Technology Inc.
DD
R1 + R2
Q1
is below a certain level
R1
RESET
MCP2122
V
DD
= 0.7V