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About Bert
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11-29-2019
11-29-2019
Bert
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11-29-2019
11:33 AM
True, but the resistor is a 10k one. So 3.6V / 10k = 0.36mA. I would think this is too little to light a LED. I don't know the inner workings of the digital interface of the chip. My guess is that I somehow managed to damage it causing high current on this particular pin. I don't know if the high current is also there when the interface is enabled (low CSB). But at least when the interface is in high-z mode, there is excess current on the clock pin.
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11-29-2019
10:31 AM
I have a BME280 connected to a ATtiny85 using SPI. There are 10k pullups because the module I bought can be used in SPI and I2C. As I don't have an accurante milliamps meter, I'm powering both using a 5V source via a LED. This gives me 5V - 1,4V = 3,6V. This is borderline, but it's the best I have. By the brightness of the LED, I have a clue about the current consumption. So I read the sensor, go to sleep and on wakeup, read again... Everything works except the power consumption during sleep is high. When I use SPI mode 00, the LED is always bright with short flickering when reading the sensor. When I use SPI mode 11, the led is off and only flashes when reading. Is the BME's power consumption different using the different modes? I can't find any clues in the datasheet. It could very well be that I somehow partially burned the sensor while testing/trying/... (=learning). PS I think the excess current goes via the SCK pin.
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