MCP2021-500E/P Microchip Technology, MCP2021-500E/P Datasheet - Page 9

• Manufacturer Part Number: MCP2021-500E/P
• Description: IC LIN TXRX ON-BOARD VREG 8DIP
• Manufacturer: Microchip Technology
• Type: Transceiverr

Specifications of MCP2021-500E/P

• Number Of Drivers/receivers: 1/1
• Protocol: LIN
• Voltage - Supply: 6 V ~ 18 V
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: APGRD004 - REF DESIGN MOD AUTO AMBNT LIGHTAC164130 - BOARD DAUGHT PICTL PLUS ECAN/LIN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1.5.8
Fault Detect output and Transmitter Enable input
bidirectional pin.
This pin is an open-drain output. Its state is defined as
shown in
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 1-2:
1.5.9
RESET is an open-drain output pin. This pin tracks 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 remain high (‘1’). When the
system voltage drops below the minimum required, the
voltage regulator will shut down and immediately
convert the RESET output to (‘0’). When connected to
a micro-controller input, this can provide a warning that
the voltage regulator is shutting down (see
2). Alternately, it can act as an external brown-out by
connecting the RESET output to MCLR (see
Example 1-3). In addition to monitoring the internal
voltage, RESET is asserted immediately upon entering
the Powerdown mode.
© 2009 Microchip Technology Inc.
Legend: x = don’t care
Note 1:
TXD
In
H
H
L
L
x
x
Table
RXD
Out
H
H
The FAULT/TXE is valid after approximately 25 µs after TXD falling edge. This is to eliminate false fault
reporting during bus propagation delays.
L
L
x
x
RESET
FAULT/TXE
1-2. The transmitter driver is disabled
FAULT/TXE TRUTH TABLE
LIN
GND
GND
V
V
V
V
I/O
BB
BB
BB
BB
BUS
Override
Thermal
OFF
OFF
OFF
OFF
ON
x
Table
Example 1-
1-1.
External
Input
H
H
H
H
H
L
FAULT/TXE
Output
Driven
The FAULT/TXE also signals a mismatch between the
TXD input and the L
detect a bus contention. Since the bus exhibits a
propagation delay, the sampling of the internal
compare is debounced to eliminate false faults.
This
approximately 750 kΩ.
The FAULT/TXE pin sampled at a rate faster than every
10 µs.
H
H
H
L
L
x
Note 1: The FAULT/TXE pin is true (0) whenever
pin
2: FAULT/TXE is true (0) when V
FAULT, TXD driven low, LIN
V
OK
OK
OK, data is being received from the LIN
FAULT, Tranceiver in thermal shutdown
NO FAULT, the CPU is commanding the
tranceiver to turn off the transmitter driver
BB
has
the internal circuits have detected a short
or thermal excursion and have disabled
the L
and has disabled the L
(Note 1)
BUS
an
BUS
output driver.
internal
MCP2021/2
level. This can be used to
Definition
pull-up
BUS
DS22018E-page 9
BUS
output driver.
shorted to
REG
resistor
not OK
BUS
of