BQ25622: Minimum value for the initial interrupt for signaling that I2C is ready to accept transactions.

Nandor Janky

Part Number: BQ25622

Tool/software:

Hey,

In our setup there's an MCU attached to the INT_N line, but our initialization code for the MCU is not 0 time, so I'm not sure if we can accurately detect that the chip is ready to accept I2C transactions.

My questions:

- Is there any minimum/typical/maximum value for the initial INT_N? (I haven't found any spec in the Timing Requirements section)

- What is the robust and recommended way of detecting that the device is capable of serving I2C requests?

Thanks & BR,

Nandor

over 1 year ago

0 Ning T over 1 year ago

TI__Guru 57781 points

Nandor,

- Not available.

- When either voltage rises above its undervoltage lockout (UVLO) threshold, all registers are reset to their POR values and the I2C interface is enabled for communication. A non-maskable INT pulse is generated, after which the host can access all of the registers.

Thanks,

Ning.

0 Nandor Janky over 1 year ago in reply to Ning T

Prodigy 100 points

Hey,

So there's no typical value for the initial INT pulse delay after voltage rise. Until the device is ready, I assume I'll read 0xFF for all registers that I try to access, right?

Thanks & BR,

Nandor

+1 Ning T over 1 year ago in reply to Nandor Janky

TI__Guru 57781 points

Hi Nandor,

It could be NACK when the I2C communication is not available.

Thanks,

Ning.

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BQ25622: Minimum value for the initial interrupt for signaling that I2C is ready to accept transactions.