Quantity   Component name
1 × ATMEGA328PB-MN 8-bit MCU with I2C, SPI, RTC, UART
1 × MAX30205MTA+ 0.1°C accuracy SMD I2C temperature sensor
1 × AT25DN512C-XMHF-B 512kbit SPI EEPROM memory by Adesto in a TSSOP8 package
1 × ECS-.327-7-34B-C-TR Frequency Control / Crystals 32.768kHz 10ppm 7pF
1 × BAT-HLD-001 CR2032 coin cell battery holder SMD by Linx