Chip Pin Connections

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U5
Below is an overview of the typical mandatory and optional pins for the ICM-42670-P (U5) based on its datasheet. Note: It is critical to review the “Pin Configuration” and “Electrical Characteristics” sections of the datasheet (available here) to ensure proper handling (for example, how to treat reserved pins). The table below summarizes the common practice for connections:

Table

Pin (Physical Name)Mandatory Connection?Typical Function
AP_SDO/AP_AD0 (Pin 1)Optional (configuration dependent)Provides the serial data output or is used for address selection. This pin’s use depends on whether you are using SPI (or also for configuration in other digital interfaces).
RESV_2 (Pin 2)Follow datasheet recommendationReserved. In many cases, these pins are not connected, or they must be tied to a defined level as specified by the datasheet.
RESV_3 (Pin 3)Follow datasheet recommendationReserved – refer to the datasheet for the correct treatment (often left floating or tied according to application notes).
INT1/INT (Pin 4)Optional (if interrupts are used)Functions as an interrupt output. It must be connected if your system is intended to react to sensor interrupt signals; otherwise, it may be left unconnected.
VDDIO (Pin 5)MandatorySupplies the digital I/O voltage. This pin must be connected to the proper logic supply (often different from the core supply) to ensure proper interface levels.
GND (Pin 6)MandatoryProvides the common ground reference for the sensor. Always connect to the system’s ground.
FSYNC (Pin 7)Optional (if synchronization is needed)Offers an external synchronization input. If your design requires synchronizing with an external signal or aligning sensor data capture, connect this; otherwise, it can be left open.
VDD (Pin 8)MandatorySupplies the main power for the sensor’s internal circuitry. This connection is essential for proper operation.
INT2 (Pin 9)OptionalA secondary interrupt output, used if your design calls for an additional interrupt signal. Otherwise, it may remain unconnected.
RESV_10 (Pin 10)Follow datasheet recommendationReserved – typically should be left unconnected or connected as directed in the datasheet.
RESV_11 (Pin 11)Follow datasheet recommendationReserved – refer to the datasheet guidelines.
AP_CS (Pin 12)Required if using SPI; otherwise as neededIn SPI mode this is the chip select line and must be connected. In an I²C configuration (if supported), this pin’s use may differ or be bypassed per the datasheet instructions.
AP_SCL/AP_SCLK (Pin 13)Required for digital interfacingActs as the serial clock for SPI or the clock line (SCL) for I²C operation. Essential for timing the communication protocol in use.
AP_SDA/AP_SDIO/AP_SDI (Pin 14)Required for digital interfacingProvides the serial data to/from the sensor. This line is essential for data exchange whether in SPI or I²C mode.
Disclaimer: The above table is a common interpretation of the typical usage. Always check the actual datasheet for the ICM-42670-P to verify which pins are mandatory for your chosen operating mode and how the reserved pins are to be handled. The datasheet will also provide any additional recommended circuitry (such as decoupling capacitors on VDD and VDDIO) to ensure proper operation.
Would you like guidance on how to check this information in the datasheet using Flux’s datasheet reader (via the @file tool)?
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devin309297

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