Lin; Figure 4-24. Lin Phy; Table 4-14. Test Automation Header Gpio Mapping; Table 4-15. Lin Mux Select Logic - Texas Instruments AM263 Series User Manual

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The Test Automation Circuit is powered by a dedicated 3.3 V power supply (VSYS_TA_3V3) that is generated by
a 5 V to 3.3 V buck regulator (TPS62177DQCR).
The AM263x SoC I2C2 instance is connected to both the Test Automation Header and the bootmode IO
expander (TCA6408ARGTR).
Table 4-14 details the Test Automation GPIO mapping:
Signal Name
TA_POWERDOWN
TA_PORZn
TA_RESETz
TA_GPIO1
TA_GPIO2
TA_GPIO3
TA_GPIO4

4.15 LIN

The AM263x Control Card supports Local Interconnect Network communication through the use of a LIN
transceiver (TLIN2029-Q1) that outputs the LIN Bus to the second pin of a 3 pin header.
The LIN transmit and receive signals are internally muxed on the AM263x with the UART1 transmit and receive
signals. Because of the internal muxing, there is an external 1:2 mux (SN74CB3Q3257PWR) which has a select
line that is driven by the GPIO Expander.
Select Logic
LOW
HIGH
SPRUJ09C – MARCH 2022 – REVISED FEBRUARY 2023
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Table 4-14. Test Automation Header GPIO Mapping

Description
when logic low, disables the 3.3 V buck regulator (TPS62913RPUR) that is used in the
first stage of DC/DC conversion
when logic low, connects the PORz signal to ground due to the PMOS V_GS being less
than zero creating a power on reset to the MAIN domain
when logic low, connects the WARMRESETn signal to ground due to the PMOS V_GS
being less than zero creating a warm reset to the MAIN domain
when logic low, connects the INTn signal to ground due to the PMOS V_GS being less
than zero creating an interrupt to the SoC
when logic low, disables the 1.2 V buck regulator (TPS62913RPUR)
when logic low, disables the bootmode buffer output enable
Reset signal for Bootmode IO Expander (TCA6408ARGTR)

Figure 4-24. LIN PHY

Table 4-15. LIN MUX Select Logic

Condition
LIN Selected
HSEC UART Selected
Copyright © 2023 Texas Instruments Incorporated
Hardware Description
Function
A→B1
A→B2
AM263x Control Card Hardware User's Guide
Direction
Output
Output
Output
Output
Output
Output
Output
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