LDC1614 chip resets after exiting sleep mode

Lori Cook

Other Parts Discussed in Thread: LDC1614

We are working with a LDC1614 chip. Using the I2C communication layer (via bcm2835 library for the Raspberry PI), the code sets the CONFIG register (0x1a) to 0x2000; then the MUX_CONFIG to 0xC20F. But when we set the CONFIG register bit to exit sleep mode, the chip resets itself. The CONFIG register returns to 0x2801 and the MUX_CONFIG returns to 0x020F.

What conditions causes the chip to reset?

Sincerely,

Lori A. Cook

over 10 years ago

0 Lori Cook over 10 years ago

Prodigy 60 points

FYI - Following the "Typical Application" instructions (Pages 40 & 41) of the specifications causes the same behavior.

0 Chris Oberhauser66 over 10 years ago in reply to Lori Cook

TI__Genius 14270 points

Hello Lori,

Please make sure that the supply voltages are properly bypassed. Also, make sure there are no glitches on the SD pin or the I2C pins; you might want to put ~100pf in parallel with the I2C pull-ups if you are putting glitches on the I2C.

Regards,

ChrisO

0 Lori Cook over 10 years ago in reply to Chris Oberhauser66

Prodigy 60 points

Chris

The SD pin may have been the problem. Once it was tied low, the code could get the chip out of sleep mode and start reading the channel 0. It has been running for over an hour now without any glitches. Thank you for the pointer/confirmation of what we thought the cause was.

Cheers
Lori

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LDC1614 chip resets after exiting sleep mode