4 layers85.7 × 73.9 mm

Boards in 1 GitHub repository, designed in KiCad, that use the PCF2127AT/2Y by NXP Semiconductors (-40℃~+85℃ 0.7uA 1.8V~4.2V 700nA Built-in SPI、I2C Temperature compensation、Backup power management and battery charging、Battery low-voltage detection、InsideSRAM/NVRAM、Timestamp function、Programmable clock output、Alarm function、Locking and tamper-proof、Periodic interrupt output、Countdown timer Yes SOIC-20-300mil Real Time Clocks ROHS). See how each wires it, with its parts, size, README and files; the PCF2127AT/2Y’s symbol, footprint and pinout are on its own page.
