MCP2021/2
EXAMPLE 1-2:
TYPICAL MCP2022 APPLICATION
+12
+12
WAKE-UP
43V
(5)
220 kΩ
V
DD
TXD
RXD
I/O
I/O
INT
100 nF
(3)
R
TP
(5)
C
F
Master Node Only
+12
C
G
V
REG
TXD
V
BB
1 kΩ
RXD
CS/LWAKE
FAULT/TXE
RESET
V
SS
L
BUS
27V
(4)
LIN Bus
V
DD
(6)
Note 1:
See
for correct capacity and ESR for stable operation.
2:
C
F
is the filter capacitor for the external voltage supply.
3:
This diode is only needed if CS/LWAKE is connected to 12V supply.
4:
Transient suppressor diode. Vclamp L = 43V.
5:
These components are required for additional load dump protection above 43V.
6:
Required if CPU does not have internal pullup.
DS22018E-page 6
©
2009 Microchip Technology Inc.