MCP2021_12 Datasheet, PDF (11/52 Pages) Microchip Technology – LIN Transceiver with Voltage Regulator

MCP2021/2/1P/2P
TABLE 1-1: OVERVIEW OF OPERATIONAL MODES
State
Transmitter Receiver
Voltage
Regulator
Operation
Comments
POR
Ready
OFF
OFF
Operation
ON
Power-Down
OFF
Transmitter-Off
OFF
OFF
ON
ON
Activity
Detect
ON
OFF
ON
ON
OFF
ON
Read VBB; if VBB>5.75V, enter Ready
mode
MCP2021/2:
Bus Off state
If CS/LWAKE is high level, then Operation
mode.
MCP2021P/2P:
If CS/LWAKE is high level and FAULT/TXE
is high level, then Operation mode.
If CS/LWAKE is high level and FAULT/TXE
is low level, then TXOFF mode.
If CS/LWAKE is low level, then Power-
Down mode.
If FAULT/TXE is low level or TXD/LBUS
permanent dominant is detected, then
Transmitter-Off mode.
Normal
Operation
mode
On LIN bus falling, go to Ready mode. On
CS/LWAKE high level, go through Ready
mode; then, to either operation or
Transmitter-Off mode (refer to Figure 1-2
and Figure 1-3).
Low Power
mode
If CS/LWAKE is low level, then Power-
Down mode.
If FAULT/TXE is high, then Operation
mode.
© 2005-2012 Microchip Technology Inc.
DS22018F-page 11