Texas Instruments LaunchPad AM243 Series User Manual page 44

Hardware Description
4.16 Test Automation Interface
The LaunchPad supports a 40-pin test automation header (687140183622 from Wurth) that allows an external
controller to manipulate some basic operations like power down, power on reset (POR), warm reset, boot mode
control and other functions.
Signal
POWER_DOWN
PORZn
WARM_RESETn
GPIO3
GPIO4
Bootmode_I2C
I2C1
The test automation circuit has voltage translation circuits so that the controller is isolated from the IO voltages
used by the AM243x. Boot mode for the AM243x can be controlled by either the DIP switch or the test
automation header through the I2C IO expander.
44 AM243x LaunchPad™ Development Kit User's Guide
Figure 4-28. Test Automation Header
Table 4-15. Test Automation Signal Description
Signal Type
GPIO
GPIO
GPIO
GPIO
GPIO
I2C
I2C
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Function
Instructs the LaunchPad to power down all
circuits
Creates a PORz into the AM243x
Creates a RESETz into the AM243x
Disables the boot mode buffer
Resets the bootmode IO expander
communicates with bootmode I2C buffer
For internal testing
SPRUJ12B – AUGUST 2021 – REVISED OCTOBER 2022
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