MPC5777C Ethernet MII/RMIII power segment current draw

[richardwebb]

If Ethernet is not used on the MPC5777C, what is the current draw from the VDDE2A and VDDEH3A power domains when 3.3V is applied?

Also, if no ADC inputs are used, what is the current draw on the following 5V domains:

VDDA_SD, VDDA_MISC, VDDA_EQ_A, VDDA_EQ_B, VRH_SD & VRH_EQ ?

Regards,

Richard.

[lukaszadrapa · Accepted solution]

Hi @richardwebb 

VDDEx and VDDEHx are supply rails for IO pads, not for the internal modules. If pins on those segments are not used, you can expect only minimal current for static functionality.

There are some numbers for analog supply voltages only if ADC modules are used.

Well, I did some quick measurement on my EVB when only empty project was loaded to the MCU.

VDDE2A and VDDEH3A show only some lower hundreds of uA.

VDDA_SD, VDDA_MISC and VRH pins show some values close to zero.

Higher current consumption can be seen only on VDDA_EQ_A and VDDA_EQ_B – I can see about 7mA here (to both pins in total, I can’t measure it separately).

These are not official numbers, we do not have such specification but I hope this helps a bit.

Regards,

Lukas