• IO level of external MCU should be of same level as AFE’s IO supply
3.6 USB Interface
The EVM has a micro-USB interface for PC application connectivity requiring a standard micro-USB to USB
cable for connection.
3.7 On-Board Key Interface
The EVM has 2 switches. The function of the two switches is defined in Table 3-3
Table 3-3. AFE44S30 EVM Switches
Switch Name Description
RESET This switch is used to reset the MCU. The MCU resets and starts
again with the firmware loaded. On MCU boot routine, the MCU
resets the AFE4500.
BSL This switch is used to enable boot strap loader (BSL) MSP430
firmware.
(1)
(1) To enable BSL, disconnect device and then reconnect while holding down BSL switch. The device will appear as an HID device in the
Device Manager.
3.8 Visual Indication
Soon after powering the EVM:
• D24 blinking: EVM is working and software is not capturing any data.
• D21 ON: USB is not enumerated. This can happen if the EVM is only getting power from the USB and not
able to communicate
• D23 ON: AFE4500 registers are getting written by MCU.
• D22 ON: MCU is reading the AFE4500 registers.
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AFE4500 EVM Hardware
SBAU370 – APRIL 2021
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AFE4500 EVM User Guide 19
Copyright © 2021 Texas Instruments Incorporated
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