CC2640 standby current draw inconsistency

Priya Nadathur

Genius 4355 points

Other Parts Discussed in Thread: CC2640, CC2650

CC2640 4x4 custom board, BLE stack 2.2, TI RTOS 2.18, XDS00 debugger, CCS 6.2,

SmartRF Flash programmer v1.7.2.

When programmed using Code composer studio, the board shows a standby current draw

of 1-3uA (measured using a high precision multimeter in series with a 10 Ohm resistor and

power supply to the CC2640). But when the same hex files are programmed

through the flash programmer, the standby current draw goes up to 0.5mA.

What are some reasons and possible solutions for this inconsistency? Any setup issues?

This has to be fixed in order for the boards to go to production. Is there anything else that

can be done to track down this problem? If the DK needs to be used, please provide the

example project to try, I have not had success with current measurement on the CC2650 DK.

Thanks,

Priya

over 9 years ago

0 Nathan Siegel over 9 years ago

TI__Genius 10980 points

Hi,

When you program it with CCS, are you running with the debugger when you measure the current?

-Nathan

0 Priya Nadathur over 9 years ago in reply to Nathan Siegel

Genius 4355 points

When I am done programming the board, I unhook the debugger and the current falls down to 1-3 uA. With the debugger in, it reads 1.8-2 mA.
With the flash programmer, after disconnecting the debugger, the lowest current I read on the same board and firmware is 0.5 mA.

Thanks,
Priya

0 Fredrik K over 9 years ago in reply to Priya Nadathur

TI__Guru** 106705 points

Hi Priya,

Do you reset the board after disconnecting the debugger?

Cheers,
Fredrik

0 Priya Nadathur over 9 years ago in reply to Fredrik K

Genius 4355 points

Resetting the board after flash programming worked on one board.
Thanks!
Priya

0 Fredrik K over 9 years ago in reply to Priya Nadathur

TI__Guru** 106705 points

Hi Priya,

Good to hear!

Before resetting, the JTAG module is left on which prevents the chip from going to Standby.

Cheers,
Fredrik

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CC2640 standby current draw inconsistency