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| 型号： | MCP2021PT-330E/MD |
| 厂商： | Microchip Technology |
| 文件页数： | 5/52页 |
| 文件大小： | 0K |
| 描述： | IC TXRX LIN ON-BOARD VREG 8DFN |
| 产品培训模块： | Microchip MCP20xx LIN Transceiver Overview |
| 标准包装： | 3,300 |
| 系列： | * |
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2005-2012 Microchip Technology Inc.
DS22018F-page 13
MCP2021/2/1P/2P
1.4.8
FAULT/TXE
Fault Detect Output and Transmitter Enable Input
bidirectional pin.
This pin is an open-drain output. Its state is defined as
shown in Table 1-2. The transmitter driver is disabled
whenever this pin is low (‘0’), either from an internal
fault condition or by external drive. This allows the
transmitter to be placed in an off state and still allow the
voltage regulator to operate. Refer to Table 1-1.
The FAULT/TXE also signals a mismatch between the
TXD input and the LBUS level. This can be used to
detect a bus contention. Since the bus exhibits a
propagation delay, the sampling of the internal
compare is debounced to eliminate false faults.
This
pin
has
an
internal
pull-up
resistor
of
approximately 750 k
Ω.
The FAULT/TXE pin sampled at a rate faster than every
10 s.
TABLE 1-2:
FAULT/TXE TRUTH TABLE
1.4.9
RESET
RESET is an open-drain output pin. This pin reflects an
internal signal that tracks the internal system voltage
has reached a valid, stable level.
As long as the internal voltage is valid, this pin will keep
high impedance. When the system voltage drops below
the minimum required, the voltage regulator will shut
down and immediately convert the RESET output to
short to GND. A pull-up resistor is needed to change
the output to high/low voltage. When connected to a
micro-controller input, this can provide a warning that
the voltage regulator is shutting down (see Figure 1-2).
Alternately, it can act as an external brown-out by con-
necting the RESET output to MCLR (see Figure 1-2). In
addition to monitoring the internal voltage, RESET is
asserted immediately upon entering the Power-Down
mode.
Note 1: The FAULT/TXE pin is true (0) whenever
the internal circuits have detected a short
or thermal excursion and have disabled
the LBUS output driver.
2: FAULT/TXE is true (0) when VREG not OK
and has disabled the LBUS output driver.
TXD
In
RXD
Out
LINBUS
I/O
Thermal
Override
FAULT/TXE
Definition
External
Input
Driven
Output
LH
VBB
OFF
H
L
FAULT, TXD driven low, LINBUS shorted to
VBB (Note 1)
HH
VBB
OFF
H
OK
LL
GND
OFF
H
OK
HL
GND
OFF
H
OK, data is being received from the LINBUS
xx
VBB
ON
H
L
FAULT, transceiver in thermal shutdown
xx
VBB
xL
x
NO FAULT, the CPU is commanding the
transceiver to turn off the transmitter driver
Legend: x = don’t care
Note 1:
The FAULT/TXE is valid after approximately 25 s after TXD falling edge. This is to eliminate false fault
reporting during bus propagation delays.
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