6 years ago
Powering external ICs off VBAT3V
Posted byJonathan Forrest0 points 4 repliesHi,
I am running the DA14580 in boost mode as I am running off a battery in the range 1.2-2V.
However, I am also using an external EEPROM to store the .hex file.
Currently I have a separate DC-DC boost converter to power the EEPROM which then has to be turned off after the DA14580 has booted.
Would it be possible to run the EEPROM directly off of VBAT3V. The 2.7V is sufficient for the EEPROM, but can it provide the 2mA or so that is required?
Note: After the DA14580 has booted it will turn power off to the EEPROM using a FET to keep total system current as low as possible.
6 years ago
Thanks JE_Dialog.
I am guessing it wouldn't be a problem but I thought I should check. I can't find much at all about the VBAT3V output of the DC-DC converter in the datasheet. The info in Table 289 seems to refer to the VDCDC output.
In fact the only reason I know that the VBAT3V output defaults to 2.7V is from these forums (see:http://support.dialog-semiconductor.com/voltage-leakage-gpio-pins-eepro…).
This fact (and the details of the register that can set the VBAT3V output voltage) appear to be absent from the datasheet.
6 years ago
Jonathan,
this is possible but you have got to make sure that the total power is keept very low. if you have EEPROM activity at the same time as RF activity you might see issues with the DCDC not being able to power the system.
问候
TN_Dialog
6 years ago
Hello Jonathan, will check for you : should not be a problem - teh spec is buried somewhere in the datasheet and i've just asked the HW team to point me towards it so that i can verify.
BR JE_Dialog