RTOS / CC2630：Cc2630 launchPad consumes too much power using external DCDC

Part Number: CC2630

Tool/software: TI-RTOS

To burn the SampleSwitch project on the cc2630 launchPad, the sleep power consumption is about 8 uA. However, the DCDC _ SW and VDDR are grounded, and 1.8 V power supply is used, only the configuration in cfg. c is modified, and the sleep power consumption is about 130 uA. the configuration of the cfg. c modification is as follows:

#define SET_CCFG_MODE_CONF_1_ALT_DCDC_VMIN              0x0

#define SET_CCFG_MODE_CONF_DCDC_RECHARGE          0x1 // Do not use the DC/DC during recharge in powerdown

#define SET_CCFG_MODE_CONF_DCDC_ACTIVE                0x1 // Do not use the DC/DC during active mod

Why have you grounded VDDR? (ref 9.4 in http://www.ti.com/lit/an/swra640a/swra640a.pdf and 1.3.13.3 in http://www.ti.com/lit/ug/swcu117h/swcu117h.pdf)

I'm sorry. I wrote it wrong. VDDS_DCDC and DCDC_SW  are grounded

Any reason you have set SET_CCFG_MODE_CONF_1_ALT_DCDC_VMIN ? See 

Configuration and comments in cfg.c File in SampleSwitch,How to set SET_CCFG_MODE_CONF_1_ALT_DCDC_VMIN？

//**************************************************
// Minimum voltage to use for alternative DCDC setting
//
// (28 + ALT_DCDC_VMIN)/16:
// 0: 1.75V
// 1: 1.8125V
// ...
// 14: 2.625V
// 15: 2.6875V
//**************************************************
#define SET_CCFG_MODE_CONF_1_ALT_DCDC_VMIN     0x8

As the app note suggest, this variable should be left to the default value. The setting should not matter since you are not using the DCDC but I want to confirm that that is the case so please follow the app note. 

Yes, after the default setting value, the current is still 130uA

I assume that you are measuring this on a custom board? 

- Which instrument do you measure this with? Is it possible to post a picture of the measurement setup? 

- Is it just CC2650 that could draw current when you are measuring? 

- Is it possible to review your schematic (if you don't want to post it openly on the forum, send me a friend request) 

The figure above is a schematic diagram of changing lunchPad to 1.8V power supply.

Using a keysight universal ammeter to measure current.

Is this a custom board or a modified board? 

LunchPad, changed the 3.3V cc2630 luanchPad to 1.8V power supply.

Do you have a picture that shows the modifications? 

I feel it's because of 1.8V instead of using 3.3V maybe at less(1.8V) voltage it's driving more current.

Not in standby, see figure 4 in http://www.ti.com/lit/an/swra498/swra498.pdf

This is the modified lunchpad, schematic diagram, which is sent above. 

okay.Thank you.

why is the power consumption so much? 

Hello, have you found the reason for the excessive power consumption?

I can't see a reason why it's high. I would like to measure this myself the way you have done it but it could be that I don't have time this week due to other tasks. 

Has the question of power consumption come to a conclusion?

No,

Have have some deadlines next week that has required most of my time. 

Hi TER , 

         I am Arrow FAE in China. user3745233 is our key ctm.Do you have the latest test results for this problem?

As I replied I have some high priority tasks I have to be done with before looking further into this. 

Verify that no external led consumes current,I'll try the second point you said,thanks

Burned the SampleSwitch project, did not open the Uart, not RX leakage

Did you try to tie the RxD pin to ground?

Yes, I tried. There's no reduction in power consumption.

Btw, have you ensured that the external flash on the LP is in power down? 

Yes, on the launchpad of the above picture, you can see that no peripheral is connected. What kind of results do you measure in the same way?

The external flash on the launchpad is still mounted (to the right of the 32 kHz xtal.