data-opMAXM86146CFU%2B
data-opMAXM86146CFU%2BT
MCU Core Supply Voltage. This pin provides dual supply operation to support PMIC-based systems and should be left open-circuit for single supply operation. This pin must always be bypassed to VSS with a 1.0μF capacitor as close as possible to the package regardless of the supply mode of operation.MCU Digital Supply Voltage. This pin must be bypassed to VSS with a 1.0μF capacitor as close as possible to the package. The device can operate solely from this one power supply pin without the need to connect VCORE by utilizing the internal VCORE regulator. The internal VCORE regulator automatically operates if the presence of a voltage on the VCORE pin is not detected. This provides single-supply-battery operation capability.MCU Digital Ground. Connect to GND.LED Power Supply Input. Connect to an external voltage supply. Bypass with a 10μF and 0.1μF capacitor to PGND.AFE Power Supply Input. Connect to an externally-regulated supply. Bypass with a 0.1μF capacitor as close as possible to pad and a 10μF capacitor to GND.AFE Power Supply Return. Connect to GND.LED Power Return. Connect to PGND.Internal reference decoupling point. Bypass with a 1.0μF capacitor to GND.Photodiode Cathode Input (CH1)Photodiode Cathode Input (CH2)Cathode of Photodiode2 (PD2)Photodiodes Anode. Connect to GND.LED Output Driver 1. Connect the LED cathode to LED1_DRV and its anode to the VLED supply.LED Output Driver 2. Connect the LED cathode to LED2_DRV and its anode to the VLED supply.LED Output Driver 3. Connect the LED cathode to LED3_DRV and its anode to the VLED supply.Hardware Power Reset (Active-Low) Input. The device remains in reset while this pin is in its active state. When the pin transitions to its inactive state, the device performs a POR reset (resetting all logic on all supplies except for real-time clock circuitry) and begins execution. This pin is internally connected with an internal pullup to the VDD supply as indicated in the Electrical Characteristics table. This pin should be left unconnected if the system design does not provide a reset signal to the device.Accelerometer SPI Chip Select (ACCEL_CS). Connect this pin to the KX122 Accelerometer SPI CS pin.Multifunction IO (MFIO). This pin provides different functions: MFIO asserts low as an output when the sensor hub needs to communicate with the host controller; the pin acts as an input and causes the sensor hub to enter bootloader mode if the MFIO pin is low during a reset.Accelerometer Interrupt (ACCEL_INT). Connect this pin to the KX122 Accelerometer INT pin.Optical AFE Interrupt Input (PPG_INT). This pin is tied to the connection between the Optical AFE interrupt and the MCU. Tie an external pullup resistor to VDD.SPI Master In/Slave Out (MISO). Connect this to the KX122 Accelerometer SDO pin. This pin is also connected to the AFE SDO pin. Refer to the Typical Application Circuit.SPI Master Out/Slave In (MOSI). Connect this to the KX122 Accelerometer SDI pin. This pin is also connected to the AFE SDI pin. Refer to the Typical Application Circuit.SPI Master Serial Clock (SCLK). Connect this to the KX122 Accelerometer SCLK pin. This pin is also connected to the AFE SCLK pin. Refer to the Typical Application Circuit.I2C Slave Clock. This is the I2C slave SCL that should be connected to the host microprocessor I2C master SCL. Pullup resistor to VDD is required.I2C Slave Data. This is the I2C slave SDA that should be connected to the host microprocessor I2C master SDA. Pullup resistor to VDD is required.General Purpose I/O. Open-drain when programmed as output (active low). Drives Select pin on (optional) External LED MUX. If external LED MUX is not used, set as N.C.32.768kHz Crystal Oscillator Input. Connect a 6pF 32.768kHz watch crystal, CL = 6pF, ESR < 90kΩ, C0 < 2pF crystal between 32KIN and 32KOUT for normal operation. Optionally, an external clock source can be driven on 32KIN if the 32KOUT pin is left unconnected.32.768kHz Crystal Oscillator Output. Connect a 6pF 32.768kHz watch crystal, CL = 6pF, ESR < 90kΩ, C0 < 2pF crystal between 32KIN and 32KOUT for normal operation. Optionally, an external clock source can be driven on 32KIN if the 32KOUT pin is left unconnected.Not Connected. Connect to unconnected PCB pad for mechanical stability. N.C. pins should not be connected to any signal, power, or ground pins.