9151 supply voltage

[poyuankung]

Hi Teams

I am designing a product using the 9151 SIP.
According to the specifications, the operating voltage ranges from 3 to 5V.
From the hardware design guide, I learned that the 9151 VDD needs to be at least above 3.2V. However, the range from 3.2V to 5V is still quite wide. If the power consumption is 100mA across the range, the peak power difference can be as much as 0.18W.
May I ask what functions are affected by the voltage difference within this range? If my battery provides 3V, and I want to achieve the best RF performance, would you recommend boosting the voltage to 3.3V, 3.7V, or even higher?

[Bendik Heiskel]

Hi,

The power consumption listed in the datasheet is specifically for 3.7V. For a comparison of current consumption between 3.0 and 3.7V you can checkout the hardware design guidelines for the nRF9151:
https://docs.nordicsemi.com/bundle/nwp_056/page/WP/nwp_056/vdd_current.html

 The VDD voltage does not influence the RF performance, so any voltage within the range is OK to use. One thing to make sure is that the voltage doesn't drop below 3V, as this can cause the device to reset due to a brownout. The battery must be able to supply enough current for the worst case scenarios listed in the hardware design guidelines linked above.

 

Best regards,

Bendik