3.1.5 Low-Power Operation

Take the following considerations to achieve the lowest power consumption possible:
  • MCP9808 in Low-Power mode (shutdown)
    • Set bit 8 (SHDN) in the 16-bit configuration register (address 0x01)
  • VEML3328 powered off
    • Send shut down command (low byte 0x11, high byte 0x80) to command register (address 0x00)
  • ATECC608N in sleep mode
    • Send the sleep command (0x01) to the ATECC608B
  • GM02S in Low-Power mode
    • Low-Power mode is active by default,
    • To enable/disable Low-Power mode, issue the following AT commands:
      AT+CFUN=5
AT+SQNHWCFG="lpm"[,("enable","disable")]
AT^RESET
    • The module must be set to “Manufacturing Mode” before applying the AT command, and the settings are latched by issuing the reset AT command.
  • Set unused AVR128DB48 I/O pins as input and disable the digital input buffer
    • Make sure to disable PB3 as it is used to enable the circuitry for system voltage measurement
  • AVR128DB48 in Power-Down sleep mode
  • Enable LOWQ® LDO mode for the 3.3V regulator (MIC3385) by setting PB4 high