參數(shù)資料
型號： MCP201
廠商： Microchip Technology Inc.
英文描述： LIN Transceiver with Voltage Regulator(帶有集成Vreg的線收發(fā)器)
中文描述： LIN收發(fā)器和穩(wěn)壓器（帶有集成Vreg的線收發(fā)器）
文件頁數(shù)： 4/27頁
文件大?。?/td> 417K
代理商： MCP201
DS21730C-page 4
Preliminary
2003 Microchip Technology Inc.
1.3
Modes of Operation
For an overview of all operational modes, please refer
to Table 1-2.
1.3.1
POWER-DOWN MODE
In the Power-Down mode, the transmitter and the volt-
age regulator are both off. Only the receiver section
and the CS/WAKE pin wake-up circuits are in
operation. This is the lowest power mode.
If any bus activity (e.g., a BREAK character) should
occur during Power-Down mode, the device will imme-
diately enable the voltage regulator. Once the output
has stabilized, enter the Ready mode.
The part will enter the operation mode if the CS/WAKE
pin should become active-high (‘1’).
1.3.2
READY MODE AND READY1 MODE
There are two states for the Ready mode.The only dif-
ference between these states is the transition during
start-up of the regulator, depending on the signal CS/
WAKE. The state Ready1 mode ensures that the tran-
sition from the Ready-to-Operation mode (once an
active edge of CS/WAKE) occurs.
Upon entering the Ready mode, the voltage regulator
is powered up. If a microcontroller is being driven by
the voltage regulator output, it will go through a power-
on reset and initialization sequence. All other circuits,
other than the transmitter, are fully operational. The LIN
pin is held in the recessive state.
The device will stay in the Ready mode until the
CS/WAKE pin goes high (‘1’). After CS/WAKE is active,
the transmitter is enabled and the part enters the
Operation mode.
The part may only enter the Power-Down mode after
going through an Operation mode step.
On power-on of the V
BAT
supply pin, the component is
in either in Ready or Ready1 mode, waiting for a
CS/WAKE rising edge.
1.3.3
OPERATION MODE
In this mode, all internal modules are operational.
The MCP201 will go into the Power-down mode on the
falling edge of CS/WAKE.
FIGURE 1-1:
OPERATIONAL MODES
STATE DIAGRAMS
TABLE 1-2:
State
POR
OVERVIEW OF OPERATIONAL MODES
Transmitter
Voltage Regulator
OFF
Note:
While the MCP201 is in shutdown, TXD
should not be activaly driven high.
Operation
Mode
Power-Down
Mode
Ready
Mode
Bus Activity
CS/WAKE = true
CS/WAKE = true
POR
CS/WAKE = false
Ready1
Mode
CS/WAKE = true
CS/WAKE = false
C
Start
FLT
FLT
Operation
Comments
OFF
Read CS/WAKE, if LOW then
READY, if HIGH READY1
mode
If CS/WAKE rising edge, then
Operation mode
If CS/WAKE falling edge,
then READY mode
If CS/WAKE falling edge,
then Power down
On LIN bus falling, go to
READY mode. On CS/WAKE
rising edge, go to Operational
mode
Sample FAULT/SLPS and
select slope
READY
OFF
ON
READY1
OFF
ON
Bus Off state
OPERATION
ON
ON
Normal Operation mode
POWER-
DOWN
OFF
OFF
Low Power mode
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