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| 型号： | MCP2050T-330E/SL |
| 厂商： | Microchip Technology |
| 文件页数： | 34/42页 |
| 文件大小： | 0K |
| 描述： | IC TXRX LIN 3.3V LDO 14-SOIC |
| 产品培训模块： | Microchip MCP20xx LIN Transceiver Overview |
| 标准包装： | 2,600 |
| 系列： | * |
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2012 Microchip Technology Inc.
DS22299B-page 4
MCP2050
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 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 > 0.8 VREG_NOM), CS/LWAKE pin,
FAULT/TXE pin and TXD pin are HIGH, the part enters
the 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 the 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 the power consumption, the
window watchdog timer is disabled and 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
internal 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 the
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
during POWER-DOWN mode, the device will
immediately enter READY mode and enable the volt-
age regulator. Then, once the regulator output has sta-
bilized (approximately 0.3 ms to 1.2 ms) it goes to
OPERATION mode. Refer to Section 1.1.6 “Remote
Wake-up” for more details.
The part will also enter READY mode from POWER-
DOWN mode, followed by 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 3.4V) 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
Watch Dog
Timer
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
ON
OFF
ON
OFF
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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