Boards in 2 GitHub repositories, designed in KiCad, that use the PCF8523TS/1 by NXP Semiconductors (-40℃~+85℃ 1.6V~5.5V 150nA Built-in I2C Watchdog timer、Backup power management and battery charging、Battery low-voltage detection、Programmable clock output、Alarm function、Sleep/Wake control、Periodic interrupt output、Countdown timer Yes TSSOP-14 Real Time Clocks ROHS). See how each wires it, with its parts, size, README and files; the PCF8523TS/1’s symbol, footprint and pinout are on its own page.
qinno/qEdge-UI
qedge+ is the industry's low power design alternative to the standard PC approach. qEdge-UI is part of qEdge+ and consists of a RaspBerry Pico with LCD, touch screen and keys and an 868MHz LoRa radio module.
millerlp/BivalveBit_hardware
Heart rate and valve gape sensor wearable for oysters and mussels