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參數(shù)資料
| 型號(hào)： | MCP2022AT-500E/ST |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 34/48頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX LIN 5.0V LDO 14-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Microchip MCP20xx LIN Transceiver Overview |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
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MCP2021A/2A
DS22298A-page 4
2012 Microchip Technology Inc.
1.1.2
READY MODE
The device enters READY mode from POR mode after
the voltage on VBB rises above the threshold of
regulator turn on voltage VON or from POWER-DOWN
mode when a remote or local wake-up event happens.
Upon entering READY mode, the voltage regulator and
receiver section of the transceiver are powered up. The
transmitter remains in an off state. The device is ready
to receive data but not to transmit. In order to minimize
the power consumption, the regulator operates in a
reduced power mode. It has a lower GBW product and
thus is slower. However, the 70 mA drive capability is
unchanged.
The device stays in READY mode until the output of the
voltage regulator has stabilized and the CS/LWAKE pin
is HIGH (‘1’).
1.1.3
OPERATION MODE
If VREG is OK (VREG>0.8VREG_NORM), and the CS/
LWAKE pin, FAULT/TXE pin and TXD pin are HIGH,
the part enters OPERATION mode from either READY
or TRANSMITTER OFF mode.
In this mode, all internal modules are operational. The
internal pull-up resistor between LBUS and VBB is
connected only in this mode.
The device goes into POWER-DOWN mode at the
falling edge on CS/LWAKE; or to the TRANSMITTER
OFF mode at the falling on FAULT/TXE while CS/
LWAKE stays HIGH.
1.1.4
TRANSMITTER OFF MODE
In TRANSMITTER OFF mode, the receiver is enabled
but the LBUS transmitter is off. It is a lower power mode.
In order to minimize power consumption, the regulator
operates in a reduced power mode. It has a lower GBW
product and thus is slower. However the 70 mA drive
capability is unchanged.
The transmitter may be re-enabled whenever the
FAULT/TXE signal returns high, by removing the inter-
nal fault condition and the CPU returning the FAULT/
TXE high. The transmitter will not be enabled even if
the FAULT/TXE pin is brought high externally, when the
internal fault is still present. However, externally forcing
the FAULT/TXE high while internal fault is still present
should be avoided, since this will induce high current
and power dissipation in the FAULT/TXE pin.
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.
1.1.5
POWER-DOWN MODE
In POWER-DOWN mode, the transceiver and the
voltage regulator are both off. Only the Bus Wake-up
section and the CS/LWAKE pin wake-up circuits are in
operation. This is the lowest power mode.
If any bus activity (e.g. a BREAK character) occurs dur-
ing POWER-DOWN mode, the device will immediately
enter READY mode and enable the voltage regulator.
Then, once the regulator output has stabilized (approx-
imately 0.3 ms to 1.2 ms), it goes to OPERATION
mode. Refer to Section 1.1.6 “Remote Wake-up”.
The part will also enter READY mode from POWER-
DOWN mode, followed by the OPERATION mode, if
the CS/LWAKE pin becomes active HIGH (‘1’).
1.1.6
REMOTE WAKE-UP
The remote wake-up sub module observes the LBUS in
order to detect bus activity. In POWER DOWN mode,
normal LIN recessive/dominant threshold is disabled,
and the LIN bus Wake-Up Voltage Threshold
VWK(LBUS) is used to detect bus activities. Bus activity
is detected when the voltage on the LBUS falls below
the LIN bus Wake-Up Voltage Threshold VWK(LBUS)
(approximately 3.5V) for at least tBDB (a typical duration
of 80 s ) followed by a rising edge. Such a condition
causes the device to leave POWER-DOWN mode.
TABLE 1-1:
OVERVIEW OF OPERATIONAL MODES
State
Transmitter
Receiver
Internal Wake
Module
Voltage
Regulator
Operation
Comments
POR
OFF
Transfer to READY mode after VBB>VON
READY
OFF
ON
OFF
ON
If CS/LWAKE high, then proceed to
OPERATION or TRANSMITTER OFF mode.
Bus Off state
OPERATION
ON
OFF
ON
If CS/LWAKE low level, then Power down
If FAULT/TXE low level, then
TRANSMITTER-OFF mode
Normal
Operation
mode
POWER DOWN
OFF
ON
Activity Detect
OFF
On LIN bus rising edge or CS/LWAKE high
level, go to READY mode.
Lowest Power
mode
TRANSMITTER-OFF
OFF
ON
OFF
ON
If CS/LWAKE low level, then Power down
If FAULT/TXE high, then OPERATION mode
Bus Off state,
Lower Power
mode
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