J14 allows the user to select the pull-up source for this circuitry. Connect a shunt between pins “WAKE_PU” and
“VBAT” to apply a pull-up to the battery voltage rail. In this configuration, the user can implement push-button
wake using the WAKE switch S1.
Connecting a shunt between pins “WAKE_PU” and “HSS” of J14 provides a pull-up to the high-side switch of
the device. This configuration is required if the user intends to implement cyclic-sense wake functionality. This
functionality is described in detail in the device’s data sheet.
2.4 Channel Expansion
The VCC, FSO, HSS, and VSUP pins allow for channel expansion, such that the TLIN1431-Q1 can control
an external transceiver or similar device. This effectively allows for an additional communication channel to be
controlled via the TLIN1431-Q1.
TLIN1431x-Q1
V
DD33
V
SUP
V
SUP
V
BAT
V
BAT
DIV_ON
PV
20 pF
500 k
HSS
3.3 V
LDO
INH
1 M
1 M pull-down or
leave floating for INH
100 nF
470
V
SUP
Micro
TLIN1039
nCS
CLK
SDI
SDO
TXD
RXD
FSO
EN
LIN
LIN
TXD
RXD
LIMP
WAKE
V
CC
= 3.3V/5V
100 nF
nRST
nINT
I/O
V
DD
LIN Controller
Or
SCI/UART
10 k
V
DD
10 µ F
Figure 2-3. Channel Expansion with LIN Transceiver
EVM Setup and Features
6
TLIN1431EVM User's Guide
SLLU326 – MAY 2022
Copyright © 2022 Texas Instruments Incorporated