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GuitarNick
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Last seen: 2 years 3 months ago
Joined: 2015-08-02 10:56
DA14531 Module Other Boot Options

Does the DA14531 module support booting from 1-wire UART on P0_5? P0_5 is the only pin exposed that is supported by the built-in DA14531 bootloader.

Our goal is to upload firmware from a master MCU with its own flash. Ideally we would have preferred the module's SPI boot pins exposed.

Device: 
PM_Dialog
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Last seen: 9 months 1 day ago
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Joined: 2018-02-08 11:03
Hi GuitarNick,

Hi GuitarNick,

The bootloader of the DA14531 supports 1-wire UART interface on P0_5 which is step 2 of the booting sequence. However, you should connect the P0_5 (Tx/Rx) with the external MCU RX and TX via a 1k resistor

Please find more info in the “DA14531 Boot Options” document. Link is provided below:

https://www.dialog-semiconductor.com/sites/default/files/an-b-072-da14531_booting_options_v1.2.pdf

Thanks, PM_Dialog

GuitarNick
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Thank you. Is the 1k resistor

Thank you. Is the 1k resistor requirement specific only to the MCU on the Pro Evaluation board? If our external MCU supports TX in open-drain mode, would it be possible to omit/short the resistor?

PM_Dialog
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Last seen: 9 months 1 day ago
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Joined: 2018-02-08 11:03
Hi GuitarNick,

Hi GuitarNick,

The 1K resistor is not only for our Development Board. Generally, we recommend the usage of 1K resistor in case of booting from 1-wire UART. I can ask the right people internally if you need to reduce the value of the resistor.

Thanks, PM_Dialog

GuitarNick
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Last seen: 2 years 3 months ago
Joined: 2015-08-02 10:56
Thank you, we will include

Thank you, we will include the 1k resistor in our PCB layout.