MAX13020 Datasheet, PDF (13/15 Pages) Maxim Integrated Products – ±60V Fault-Protected LIN Transceivers

±60V Fault-Protected LIN Transceivers
V_TXDL
V_SUP(1)
LIN BUS
SIGNAL
t_BIT
t_BIT
t_BIT
t_{BUS(DOM)(MAX)}
t_{BUS(REC)(MIN)}
V_TH(REC)(MAX)
V_TH(DOM)(MAX)
THRESHOLDS OF
RECEIVING NODE 1
V_TH(REC)(MIN)
V_TH(DOM)(MIN)
THRESHOLDS OF
RECEIVING NODE 1
RECEIVING ^VRXDL1
NODE 1
t_{BUS(DOM)(MIN)}
t_{BUS(REC)(MAX)}
RECEIVING ^VRXDL2
NODE 2
t_P(rx1)F
t_P(rx1)F
(1) TRANSCEIVER SUPPLY OF TRANSMITTING NODE.
Figure 4. LIN Waveform Definition
t_P(rx2)F
t_P(rx2)F
Reading the Wake-Up Source Flag
When a wake-up event is detected in sleep mode, the
MAX13020/MAX13021 transition to standby mode and
0.1µF
present the wake-up source flag on TXD as a strong
pulldown in the case of a local wake-up. In the case of
BAT
a remote wake-up event, TXD is pulled to ground only
by an internal resistor. The wake-up source flag can be
NWAKE
INH
determined by connecting a pullup resistor to TXD.
Choose the external pullup resistor such that TXD is a
logic-high when a remote wake-up occurs, and when a
NSLP MAX13020
MAX13021
R_L
C_L
local wake-up occurs and the strong pulldown drives
+5V
TXD low.
TXD
RXD
LIN
GND
Figure 5. Test Circuit for AC Characteristics
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