[nRF51822] Some quetions about nRF51822

RE: [nRF51822] Some quetions about nRF51822

FormerMember — Thu, 13 Feb 2014 14:59:41 GMT

Hi Jeffery, The answer to your questions reside in Table 17 and 56 in the product specification document of nrf51822. As I can understand the processor works on 1.7 V. And some of the peripherals work on 1.2 V. The input VDD voltage can be different ranges depending on the mode (Table 17). The IO pads input and output characteristics based on this VDD is mentioned in Table 56. Hope this helps.

RE: [nRF51822] Some quetions about nRF51822

Jeffery — Thu, 13 Feb 2014 08:29:01 GMT

Dear sir Please answer my question. Thanks.

Regards, Jeffery

RE: [nRF51822] Some quetions about nRF51822

Jeffery — Tue, 11 Feb 2014 09:42:25 GMT

Hi (1) About question 1, I want to know internal volatge level of nRF51822. VDD is voltage level for GPIO input or output. nRF51822 use this VDD level to communicate with other IC.

For example, if IC fabrication is 0.18um, power supply of IC core cell would be 1.8V. But, VDD could be 3.3V for IO pad.

RE: [nRF51822] Some quetions about nRF51822

Stefan Birnir Sverrisson — Mon, 10 Feb 2014 09:50:52 GMT

Hi Jeffery

The supply voltage for the nRF51822 is specified in table 17 in the product specification nRF51822_PS v2.0 for the different operating modes, if that is what you are asking.

GPIO voltage is equal to the chip supply voltage, i.e. the voltage applied to the VDD pins.

The efficiency of the DC/DC converter is described in the nRF51 Series Reference Manual v2.1 (RM), Power chapter. Efficiency of the DC/DC converter increases with higher supply voltage and increased load current.