It is also possible to reconfigure the WAKE_MCU output to reflect the state of HSS rather than WAKE. This can
be accomplished by depopulating R17 and populating a 0 Ω resistor on R19. Take care to ensure that only one
of these resistors is populated at a time.
2.8 High-Voltage Signal Monitoring
INH, HSS, and WAKE, which are high-voltage signals for the TLIN1431-Q1, can be monitored using the
three orange test points on the board: TP1 (WAKE), TP15 (WKRQ/INH), and TP16 (HSS). These are colored
differently from the logic-level signals accessible via the other test points on the board.
2.9 TXD and RXD
TXD and RXD are accessible either via TP24/TP25, or via the J8 connector. These can be used to interface with
the input/output signals of the LIN bus.
Pads R15 and C9 allow for additional pull-down resistance or capacitance on the TXD line if it is needed for
applications such as oscilloscope impedance matching. Pad C11 allows for the addition of capacitance to the
RXD line.
Placing a shunt on J17 provides a pull-up to RXD. The TLIN1431-Q1 does not require a pull-up on RXD to
operate, though this can be used to evaluate the performance of RXD under these conditions.
2.10 VCC Load Testing
The LDO output (VCC) is accessible using TP4 or via pin 1 of J4. The user can apply a load to these pins to test
the stability and performance of the LDO on the TLIN1431-Q1.
2.11 SPI Interface
When operating in SPI mode, pins 4-7 of the TLIN1431-Q1 become the SPI interface for the device. Specifically,
“WDT/CLK” is the SPI clock input, “nWDR/SDO” is the SPI serial data output, “WDI/SDI” is the SPI serial data
input, and “PIN/nCS” is the SPI active-low chip select.
The four SPI interface pins are accessible via J4, pins 12, 14, 16, and 18. These four signals are vertically
separated from the rest of the logic signals on J4. Per the silkscreen legend on the board, these four signals are
on the leftmost column of J4, while the remaining signals on this header are located on the rightmost column.
These four SPI signals can be connected to a micro controller or similar processor to control the TLIN1431-Q1
via SPI. Note that the device must start up with PIN/nCS (pin 7) floating or pulled high to interface via SPI mode.
EVM Setup and Features
8
TLIN1431EVM User's Guide
SLLU326 – MAY 2022
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