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| 型号： | MCP2003A-E/P |
| 厂商： | Microchip Technology |
| 文件页数： | 29/34页 |
| 文件大小： | 0K |
| 描述： | IC TXRX LIN W/VREG 8PDIP |
| 产品培训模块： | Microchip MCP20xx LIN Transceiver Overview |
| 标准包装： | 60 |
| 系列： | * |
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MCP2003/4/3A/4A
DS22230D-page 4
2010-2011 Microchip Technology Inc.
1.3
Modes of Operation
For an overview of all operational modes, refer to
1.3.1
POWER-DOWN MODE
In Power-Down mode, everything is off except the
wake-up section. This is the lowest power mode. The
receiver is off, thus its output is open-drain.
On CS going to a high level or a falling edge on WAKE
(MCP2003/MCP2003A only), the device will enter
Ready Mode as soon as internal voltage stabilizes.
Refer to the AC Spec table. In addition, LIN bus activity
will change the device from power-down mode to ready
mode; MCP2003/4 wakes up on a falling edge of LIN
bus and MCP2003/4A on a rising edge, following a low
level lasting at least 20 S of time. Refer to Figure 1-2
– Figure 1-5 about remote wake up. If CS is held high
as the device transitions from Power-Down to Ready
mode, the device will transition to either Operation or
Transmitter Off mode, depending on TXD input, as
soon as internal voltages stabilize.
1.3.2
READY MODE
Upon entering the Ready mode, VREN is enabled and
the receiver detect circuit is powered up. The transmit-
ter remains disabled and the device is ready to receive
data but not to transmit.
Upon VBB supply pin power-on, the device will remain
in Ready mode as long as CS is low. When CS transi-
tions high, the device will either enter Operation mode,
if TXD pin is held high, or the device will enter Trans-
mitter Off mode, if TXD pin is held low.
1.3.3
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. For the MCP2003/4 device, a
specific process should be followed to put all nodes into
Power-down mode. Refer to Section 1.6 “Enter
Power-Down Mode” and Figure 1-6. The device will
enter Transmitter Off mode in the event of a Fault
condition. These include: thermal overload, bus
contention and TXD timer expiration.
The
MCP2004/2004A
device
can
also
enter
Transmitter Off mode if the FAULT/TXE pin is pulled
low. The VBB-LBUS pull-up resistor is connected only
in Operation mode.
1.3.4
TRANSMITTER OFF MODE
Transmitter Off mode is reached whenever the
transmitter is disabled either due to a Fault condition or
pulling the nFAULT/TXE pin low on the MCP2004/
2004A. The fault conditions include: thermal overload,
bus contention or TXD timer expiration.
The device will go into Power-Down mode on the falling
edge of CS, or return to Operation mode if all faults are
resolved and the FAULT/TXE pin on the MCP2004/
2004A is high.
FIGURE 1-2:
OPERATIONAL MODES STATE DIAGRAM – MCP2003
POR
VREN OFF
RX OFF
TX OFF
VBAT>5.5V
Ready
VREN ON
RX ON
TX OFF
TOFF
Mode
VREN ON
RX ON
TX OFF
Operation
Mode
VREN ON
RX ON
TX ON
POWER
DOWN
VREN OFF
RX OFF
TX OFF
CS=1 & TXD=0
CS=1 & TXD=1
CS=1 & TXD=1 & No Fault
Fault (thermal or timer)
CS=0
Falling edge on LIN
or CS=1
or falling edge on WAKE PIN
CS=0
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