LDC1000 controlled by the external MCU

Jordda

Intellectual 665 points

Hi,

I've seen there are 6 pins to control LDC1000 by the external MCU. Could I just use SPI ( CSB, SCLK and SDO ) only

to configure LDC1000 and then directly get High or Low under Comparator Mode? Thanks!

over 11 years ago

0 Charles Cheung* over 11 years ago

TI__Intellectual 2790 points

Yes, you can use 4 pins: SDI, SDO, SCLK, and CSB to configure the LDC and read the status register to determine whether the threshold has been tripped.

Thanks

0 Jordda over 11 years ago in reply to Charles Cheung*

Intellectual 665 points

Thanks!

I remember it provides Comparator Mode so as to get High or Low signal from INTB pin. It means we may not need to read data from LDC1000 SDO. Do you agree ?

0 Charles Cheung* over 11 years ago in reply to Jordda

TI__Intellectual 2790 points

Yes.

However, that is only if the SPI bus integrity is assured in your system. In other words, depending on your system and environment, if there is crosstalk from other buses or signals, you might want to reconsider the disadvantage of not being able to verify the LDC1000 status and other registers just to check that it has been configured properly.

The problem of signal integrity might also arise from brownout, e.g. a situation where the MCU is still active and running at VIO but the LDC1000 has reset due to severe brownout.

0 Jordda over 11 years ago in reply to Charles Cheung*

Intellectual 665 points

Thanks, Charles.

It's much clearer.

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LDC1000 controlled by the external MCU