IC identification, pt. 4 (sensors):

Maxim Integrated MAX86902 heart rate sensor (likely)

STMicroelectronics LSM6DS3 3-axis accelerometer/gyroscope

Bosch Sensortec BMP280 pressure sensor

AKM Semiconductor AK09916 3-axis electronic compass

Seiko Instruments S-5712CCDL1-I4T1U hall effect sensor