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MCP2021T-500E/SL bảng dữ liệu(PDF) 7 Page - Microchip Technology

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 2005-2014 Microchip Technology Inc.
DS20002018H-page 7
MCP2021/2/1P/2P
1.3.5
TRANSMITTER-OFF MODE
Whenever the FAULT/TXE signal is low, or permanent
dominant on TXD/LBUS is detected, the LBUS
transmitter is off.
The transmitter may be re-enabled whenever the
FAULT/TXE signal returns high, either by removing the
internal Fault condition or when the CPU returns the
FAULT/TXE high. The transmitter will not be enabled if
the FAULT/TXE pin is brought high when the internal
fault is still present.
If TX-OFF mode is caused by TXD/LBUS permanent
dominant level, the transmitter can recover when the
permanent dominant status disappears.
The transmitter is also turned off whenever the voltage
regulator is unstable or recovering from a fault. This
prevents unwanted disruption of the bus during times of
uncertain operation.
1.3.6
REMOTE WAKE-UP
The Remote Wake-Up sub-module observes the LBUS
in order to detect bus activity. Bus activity is detected
when the voltage on the LBUS stays below a threshold
of approximately 0.4 VBB for a typical duration of at
least 20 µs. The MCP2021/2 device is level sensitive to
LBUS. Dominant level longer than 20 µs will cause the
device to leave the Power-Down mode. The
MCP2021P/2P device is falling-edge sensitive to LBUS.
Only the LBUS transition from recessive to dominant,
followed by at least 20 µs dominant level, can wake up
the device. Putting CS/LWAKE to high level also wakes
up the device. Refer to Figure 1-2 and Figure 1-3.
1.3.7
DIFFERENCE DETAILS BETWEEN
MCP2021/2 AND MCP2021P/2P
The MCP202XP is a minor variation of the MCP202X
device that adds improved state machine control, as
well as the ability to disconnect the internal 30kΩ
pull-up between LIN and VBB in all modes except nor-
mal operation. These changes allow the system
designer to better handle Fault conditions and reduce
the overall system current consumption. The differ-
ences between the two device versions are as follows:
1.
Switchable LIN-VBB Pull-Up Resistor:
On the MCP202XP device, the internal 30kΩ
pull-up resistor is disconnected in all modes
except Operation mode. On the MCP202X
device, this pull-up resistor is always connected.
(See the MCP2021/2 Block Diagram and the
MCP2021P/2P Block Diagram for details.)
2.
Power-Down Wake-up on LIN Traffic:
The MCP202XP device requires a LIN falling
edge to generate a valid Wake condition, due to
bus traffic. The MCP202X device will generate a
Wake anytime LIN is at a valid dominant level.
Because of this, if the LIN bus becomes perma-
nently shorted, it becomes impossible to place
the MCP202X in a low-power state.
3.
State Machine Options:
The MCP202XP device is able to enter
Transmitter Off mode from Ready mode without
transitioning through Operation mode. The
MCP202X device must enter Operation mode
from Ready mode. (see State Machine
Diagrams,
Figure 1-2
and
Figure 1-3
for
details). This capability allows the system
designer to monitor the bus in Ready mode to
determine if the system should transition to
normal operation and connect the internal
pull-up, or if Ready mode was reached due to an
invalid condition. In the case of an invalid
condition, the MCP202XP device can be placed
into Power-Down mode without connecting the
internal pull-up and waking other nodes on the
LIN Bus network.
To properly take advantage of the device differences,
the system designer is required to implement some
microcontroller code to the power-up routine. This code
will monitor the status of the LIN bus to determine how
to respond to the dominant signal. It will also determine
if the local LIN node needs to respond or can ‘Listen
Only’. If the local LIN node does not need to respond, it
can enter Transmitter Off mode, disconnecting the
30 kΩ pull-up, reducing module current while still
maintaining the ability to properly receive all valid LIN
messages.
Note:
To enter Transmitter Off, the system must
set TXE ‘low’ before pulling CS high (see
Figure 1-5). Otherwise, if CS is pulled high
first, the MCP202XP will enter Operation
mode due to the internal pull-up on TXE.


Số phần tương tự - MCP2021T-500E/SL

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