MCP2004 Microchip Technology, MCP2004 Datasheet - Page 4

• Manufacturer Part Number: MCP2004
• Description: LIN J2602 Transceiver
• Manufacturer: Microchip Technology

MCP2003/4
1.3
For an overview of all operational modes, refer to
Table
1.3.1
In Power Down mode, the transmitter and V
both off. Only the receiver section and the wake-up
circuits are operational. This is the lowest power
mode.
On bus activity (e.g. a BREAK character), CS going to
a high level, or on a falling edge on WAKE, the device
will immediately enter Ready mode. If CS is held high
as the device transitions from Power Down to Ready
mode, the device will transition to Operation mode as
soon as internal voltages stabilize.
1.3.2
Upon entering the Ready mode, V
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. If CS transitions
high, the device will enter Operation mode. However, if
FIGURE 1-2:
DS22230A-page 4
Note:
VREN OFF
1-1.
RX OFF
TX OFF
POR
Modes of Operation
Bus activity is defined as LBUS dropping
below V
Activity Debounce time (tBDB).
READY MODE
POWER-DOWN MODE
IL
(L
OPERATIONAL MODES STATE DIAGRAM – MCP2003
BUS
VBB > 5.5V
) for longer than the Bus
Falling edge
or CS = 1
on LIN
REN
is enabled and
REN
are
CS = 1 and TXD = 0
Sleep Mode
VREN OFF
VREN ON
RX OFF
TX OFF
Ready
TX OFF
Mode
RX ON
CS=0
VREN ON
TX OFF
TOFF
Mode
RX ON
the T
will transition to Transmitter Off mode instead of
Operation mode.
1.3.3
In this mode, all internal modules are operational.
The MCP2003/4 will go into the Power Down mode on
the falling edge of CS. The MCP2003/4 will enter
Transmitter Off mode in the event of a Fault condition.
These include: thermal overload, bus contention and
T
The MCP2004 device can also enter Transmitter Off
mode if the FAULT/TXE pin is pulled low
1.3.4
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. The
fault conditions include: thermal overload, bus
contention or TXD timer expiration.
The MCP2003/4 will go into Power Down mode on
falling edge of CS, or return to Operation mode if all
faults are resolved and the FAULT/TXE pin on the
MCP2004 is high.
XD
timer expiration.
XD
pin is held low when CS goes high, the device
CS = 1 and TXD = 1
OPERATION MODE
TRANSMITTER OFF MODE
(Thermal or Timer)
and No Fault
CS = 1 and
TXD = 1
Fault
CS=0
 2010 Microchip Technology Inc.
Operation
VREN ON
Mode
RX ON
TX ON
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