nRF51822 randomly leaks current, short-circuiting fixes that

RE: nRF51822 randomly leaks current, short-circuiting fixes that

Stian Røed Hafskjold — Tue, 07 Feb 2017 11:08:58 GMT

Okay, it could be, but we have seen problems with nRF51 as well. Let me know how it goes, and if you are sure it is the nRF51 I need you to open up a Mypage case for more info.

RE: nRF51822 randomly leaks current, short-circuiting fixes that

Jarmo — Tue, 07 Feb 2017 08:37:03 GMT

It might be that the root cause is actually the FTDI chip that ends up leaking current after being partially powered. I will inform you when we are sure.

RE: nRF51822 randomly leaks current, short-circuiting fixes that

Jarmo — Mon, 06 Feb 2017 20:51:45 GMT

Part of the leakage was probably because of UART/USB-converter (FTDI) and current leaking through RX/TX/CTS/RTS -pins into/from FTDI-chip. Disabling UART and putting those pins into high impedance state removed the leakage in some situations.

However, there is still now and then quite a lot left, dozens of microamps. Is there some internal block that could cause the leakage, and should I maybe try enabling all the blocks first, and then disabling them during start-up ("poor man's reset")? I mean such as both TWI units, SPI, clock, timers, ADC etc. I think we cannot share our schematics.

RE: nRF51822 randomly leaks current, short-circuiting fixes that

Stian Røed Hafskjold — Mon, 06 Feb 2017 12:23:26 GMT

In some specific situations not completely powering down the chip could case some problems. Please register a case at the Mypage support portal, www.nordicsemi.com/.../Contact-Support-Team, and the support team can look through your schematics and provide you with a work around for this.