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Hardware Description
The AM263x SoC does not have an integrated pull up for the LIN RX signal, therefore, an external pull up
resistor is needed to the processor I/O supply voltage is required.
The AM263x Control Card includes a double pole single throw switch (SW10) to control the voltage supply for
the LIN Transceiver.
LIN Voltage Switch Position
Pin 1-2
Pin 2-3
There is also a single pole throw switch (SW9) that drives the LIN Node application.
LIN Node Application Switch Position
Pin 1
Pin 2
The Control Card pulls up the enable pin of the LIN transceiver for the transceiver to be in normal operational
mode when the I/O Voltage supply is brought up.
4.16 MMC
The AM263x Control Card provides a micro SD card interface that is mapped to the MMC0 instance of the
AM263x SoC.
A load switch (TPS22918DBVR) is used to power the micro SD card connector. The load switch is driven by the
output of a 2-input AND gate between WARMRESETn and GPIO_uSD_PWR_EN to power cycle the card upon
reset. The load switch uses quick output discharge (QOD) to ensure that the supply voltage reaches <10% of
nominal value during reset.
Inline ESD protection is provided for the MMC signals in the form of a six channel transient voltage suppressor
device (TPD6E001RSER).
36
AM263x Control Card Hardware User's Guide
Table 4-16. LIN Switch Logic
Voltage Supply Selected
VMAIN, 5 V supply output from either the USB-C connection or HSEC power connection.
VBAT_LIN, external voltage supply from pin 1 of 2 pin header
Table 4-17. LIN Node Application Switch
Figure 4-25. Micro-SD Connector Interface
Copyright © 2023 Texas Instruments Incorporated
LIN Node Application
Device node application
Controller node application
SPRUJ09C – MARCH 2022 – REVISED FEBRUARY 2023
www.ti.com
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