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To determine if any unconnected pins on the BMP280 sensor require pull-up or pull-down resistors, we should look at the datasheet for this component. Here are the pins and their typical functions:
VDD (Pin 1): Power supply.
GND (Pin 2 & 8): Ground.
VDDIO (Pin 3): Interface voltage for I2C or SPI.
SDO (Pin 4): SPI Data Out (MISO)/I2C address selection pin.
SCK (Pin 5): SPI Clock/I2C Clock.
SDI (Pin 6): SPI Data In (MOSI)/I2C Data.
CSB (Pin 7): Chip Select for SPI, needs to be tied to GND if using I2C.
Here are the considerations for pull-up/pull-down resistors:
SPI Mode:
CSB (Pin 7): Needs to be correctly driven to select the chip; no pull-up/pull-down required if actively driven.
SDO (Pin 4): Can be left floating when not in use, as it is internally high-impedance.
SCK (Pin 5): Usually actively driven; no need for termination resistors.
SDI (Pin 6): Usually actively driven; no need for termination resistors in simple SPI implementations.
I2C Mode:
CSB (Pin 7): Tie to GND.
SDO (Pin 4): Used to set I2C address, may need to be pulled up or down to set address properly.
SCK (Pin 5): Requires a pull-up resistor.
SDI (Pin 6): Requires a pull-up resistor.
Summary
In I2C mode, SCK and SDI should have pull-up resistors (typically 4.7kΩ each).
In SPI mode, no pull-up or pull-down resistors are needed for unconnected pins.
Specific Connections for I2C Mode:
Connect U2:CSB to GND
Connect VDD and VDDIO to your power supply (3.3V or 3.6V as required)
Connect GND pins (U2:2 and U2:8) to ground
Add pull-up resistors to SCK and SDI:
Connect SCK to your controller and add a 4.7kΩ pull-up resistor between SCK and VDD.
Connect SDI to your controller and add a 4.7kΩ pull-up resistor between SDI and VDD.
Would you like to proceed with these assumptions or adjust any of the configurations?
5mo
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Passive Components
Resistor Power Rating
Beta
Checks that the power traveling across a given resistor is under its rating with 50% headroom.