I'm in the process of designing a low power circuit for the imp004m but can't find much guidance in the spec other than a reference to a "Low power 4uA sleep mode (with external load switch)". The Designing Hardware with the imp004m
webpage only calls for an Xtal for a low power circuit.
The imp004m spec states the PSU_ENABLE pin 24 is "active high when WiFi needs 2.7v+". Would I be correct in assuming PSU_ENABLE provides the same functionality as the WLAN_POWER_EN pin 9 of the imp003? I'm not sure as the imp003 also has a PSU_EN which is an "External power supply enable" but the WLAN_POWER_EN is an "External power gate enable". Same, same but different?