Datasheet

 2010 Microchip Technology Inc. DS22230A-page 5
MCP2003/4
FIGURE 1-3: OPERATIONAL MODES STATE DIAGRAM – MCP2004
TABLE 1-1: OVERVIEW OF OPERATIONAL MODES
Note: While the MCP2003/4 is in thermal shutdown, TXD should not be actively driven high or it may power
internal logic through the ESD diodes and may damage the device.
State Transmitter Receiver Vren Operation Comments
POR OFF OFF OFF Read CS, if low, then Ready;
if high, Operational mode
Ready OFF ON ON If CS high level, then Operation mode Bus Off state
Operation ON ON ON If CS low level, then Power Down;
If FAULT/TXE low level, then Transmitter Off
mode
Normal Operation
mode
Power Down OFF Activity
Detect
OFF On LIN bus falling, go to Ready mode. On CS
high level, go to Operation mode
Low Power mode
Transmitter Off OFF ON ON If CS low level, then Power Down;
If FAULT/TXE and TXD high, then Operation
mode
FAULT/TXE only
available on
MCP2004
Operation
Mode
VREN ON
RX ON
TX ON
Ready
Mode
VREN ON
RX ON
TX OFF
TOFF
Mode
VREN ON
RX ON
TX OFF
Sleep Mode
VREN OFF
RX OFF
TX OFF
VBB > 5.5V
CS = 0
CS = 0
Falling edge on LIN
or
CS = 1
POR
VREN OFF
RX OFF
TX OFF
CS = 1and TXE = 1
and TXD = 1
and No Fault
Fault
(Thermal or Timer)
or TXE=0
CS = 1 and
(
TXE = 0 or TXD = 0
)
CS = 1 and
TXD = 1 and
TXE = 1