The pin count of 52840-CKAA

RE: The pin count of 52840-CKAA

Hsu — Tue, 24 Mar 2020 01:30:17 GMT

Hi Simon,

Got it.

Thank you.

BRs, Han

RE: The pin count of 52840-CKAA

Simonr — Mon, 23 Mar 2020 11:53:53 GMT

Sorry, I mixed up the WLCSP package and the QFAA package. There are 94 balls on the nRF52840 WLCSP package and no ground plane. There is an error in the datasheet table in section 10.4, as it should say 94. This will be corrected in the next release of the PS.

Best regards,

Simon

RE: The pin count of 52840-CKAA

Hsu — Mon, 23 Mar 2020 09:13:13 GMT

Hi Simon

We tried to count the number of the balls at "Figure 207: WLCSP ball assignments, top view" and we got balls count is 94.

And we tried to count the "Table 143: WLCSP ball assignments, we got ball count is 94 also.

Does the 94th "pin" list in the "Table 143"?

Thank you.

BRs, Han

RE: The pin count of 52840-CKAA

Simonr — Mon, 23 Mar 2020 08:38:26 GMT

This is because the 94th "pin" is the ground plane that is under the chip. The reason it isn't added in the ball count is that it isn't a ball per se, and is not configurable.

Best regards,

Simon