Internal Pull-up resistance on GPIO of nRF51822

GKahr gravatar image

asked 2017-10-12 09:22:21 +0100

Hi, the pull-up resistance Rpu of GPIO pins as stated in Product Specification v3.1 in Table 62 is supposed to be 13 kOhm (typ). Since we measured a different value on pin n_RESET/SWDIO - does the stated resistance apply to n_RESET/SWDIO?

Thank you

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MartinBL gravatar image

answered 2017-10-12 15:43:33 +0100


Under normal operating conditions (supply voltage higher than >1.8V ) the pull-up resistance on SWDIO should be typ. 13 kOhm and max 17 kOhm. However, if the supply voltage is lower than that you might measure resistances more than 10 times higher.

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Asked: 2017-10-12 09:22:21 +0100

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Last updated: okt. 12