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參數資料
| 型號： | MCP2003T-E/MD |
| 廠商： | Microchip Technology |
| 文件頁數： | 1/6頁 |
| 文件大?。?/td> | 0K |
| 描述： | TXRX LIN STAND ALONE 8DFN |
| 產品培訓模塊： | Microchip MCP20xx LIN Transceiver Overview |
| 標準包裝： | 3,300 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數： | 1/1 |
| 規(guī)程： | LIN |
| 電源電壓： | 6 V ~ 27 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-VDFN 裸露焊盤 |
| 供應商設備封裝： | 8-DFN（4x4） |
| 包裝： | 帶卷 (TR) |
2011 Microchip Technology Inc.
DS93067A-page 1
TB3067
INTRODUCTION
This technical brief gives a description of how to set the
MCP2003 in Power-Down mode in the case of a LIN
bus loss, which means the voltage level on LBUS falls
down to VIL. This situation could happen if the bus
Master microcontroller disconnects the termination
pull-up resistor (typically 1 k
Ω) from the bus to reduce
the current consumption in the bus Power-Down state.
Additionally, this technical brief describes the wake-up
procedure when the Master puts the LIN bus back into
Operation mode.
Holding the MCP2003 in power down in the case of LIN
bus loss is called “Forced Power-Down mode” in the
further description of this document.
THEORY OF OPERATION
The
MCP2003
is
a
bidirectional,
half-duplex
communication physical interface for automotive and
industrial LIN systems to meet the LIN bus specification
Revision 2.1 and SAE J2602. The MCP2003 provides
a physical interface between a microcontroller and LIN
bus.
FIGURE 1:
MCP2003 Block Diagram.
The MCP2003 can be put in Power-Down mode from
Operation mode or Transmitter-Off mode (TOFF Mode)
on the falling edge on CS.
On bus activity, or when CS is set to ‘1’, the device will
immediately wake up from Power-Down mode and
enter Ready mode.
Bus activity means that LBUS voltage has dropped
down to VIL for longer than the Bus Activity Debounce
time (tBDB).
This could be caused by the following events:
Loss/short to GND
Wake-up sequence
Sync break
This behavior is necessary to react immediately on a
LIN bus disconnection or LBUS short circuit to ground
(e.g. cable break or wrong plug-in). Additionally, the
device also wakes up on a LIN bus loss situation, which
could be an undesired behavior in certain LIN bus
systems.
Author:
Frank Ziegenhorn
Microchip Technology Inc.
MCP2003 Power-Down Mode and Wake-Up
Handling in the Case of LIN Bus Loss
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