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MCP2021T-330E/SL bảng dữ liệu(PDF) 6 Page - Microchip Technology

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MCP2021/2/1P/2P
DS20002018H-page 6
 2005-2014 Microchip Technology Inc.
FIGURE 1-1:
THERMAL SHUTDOWN STATE DIAGRAMS
1.3
Modes of Operation
For an overview of all operational modes, please refer
to Table 1-1.
1.3.1
POWER-ON RESET MODE
Upon application of VBB, the device enters Power-On
Reset mode (POR). During this mode, the part main-
tains the digital section in a Reset mode and waits until
the voltage on pin VBB rises above the “ON” threshold
(typically 5.75V) to enter to the Ready mode. If during
the operation, the voltage on pin VBB falls below the
“OFF” threshold (typically 4.25V), the part comes back
to the POR mode.
1.3.2
POWER-DOWN MODE
In Power-Down mode, the transmitter and the voltage
regulator are off. Only the receiver wake-up from the
LIN bus section, and the CS/LWAKE pin wake-up
circuits, are in operation. This is the lowest power
mode.
If pin CS/LWAKE goes to a high level during
Power-Down mode, the device immediately enters
Ready mode and enables the voltage regulator; and
after the output has stabilized (approximately 0.3 ms to
1.2 ms), the device goes to Operation mode or Trans-
mitter-Off mode (see Figure 1-2 for MCP2021/2 and
Figure 1-4 for MCP2021P/2P).
LIN bus activity will also change the device from
Power-Down mode to Ready mode. MCP2021/2
wakes up on the dominant level of the LIN bus, and
MCP2021P/2P on a falling edge that follows a domi-
nant level lasting 20 µs of time.
The Power-Down mode can be reached through either
Operation mode or Transmitter-Off mode.
1.3.3
READY MODE
Upon entering Ready mode, the voltage regulator and
receiver-threshold-detect circuit are powered up. The
transmitter remains in an OFF state. The device is
ready to receive data as soon as the regulator is stabi-
lized, but not to transmit. If a microcontroller is being
driven by the voltage regulator output, it will go through
a POR and initialization sequence. The LIN pin is in the
recessive state for MCP2021/2 and in floating state for
MCP2021P/2P.
The device will stay in Ready mode until the output of
the voltage regulator has stabilized and the CS/LWAKE
pin is true (‘1’). After VREG is stable and CS/LWAKE is
high, MCP2021/2 will enter Operation mode; and
MCP2021P/2P will enter either Operation mode or
Transmitter-Off mode, depending on the level of the
FAULT/TXE pin (refer to Figure 1-4).
1.3.4
OPERATION MODE
In this mode, all internal modules are operational.
The device will go into the Power-Down mode on the
falling edge of CS/LWAKE.
For the MCP2021P/2P devices, the pull-up resistor is
switched on only in this mode.
Operation
Mode
Transmitter
Shutdown
LBUS
Voltage
Shutdown
Regulator
Output
Temperature <SHUTDOWNTEMP
Overload
to VBB
Overload
Temperature <SHUTDOWNTEMP
Note:
The above time interval <1.2 ms assumes
12V VBB input and no thermal shutdown
event.


Số phần tương tự - MCP2021T-330E/SL

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