Power consumption in extended sleep mode

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blebot
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Power consumption in extended sleep mode

Hi Dialog ,

We are using a custom board made of DA14585 and we have done power consumption measurement using the Smart Snippets .We have enabled the EXTENDED SLEEP MODE but we are getting high current consumption in the sleep mode around 0.117 mA . we are not using the FET for the flash and we want to know if it is the reason for the high current consumption if not what else may be the reason?
In the below attached file the average current is shown as 0.242 mA and the development kit we used to measure the current is itself is consuming 0.125 mA and we subtract that from the total value and that's how we got 0.117 mA average current .

Thanks ,
Blebot.

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Device: 
PM_Dialog
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Hi blebot,

Hi blebot,

It is NOT RECOMMENDED to use the SmartSnippets toolbox in order to measure currents lower than 100μA. The power consumption of DA14585 in extended sleep mode (without OTP) is around 3.4μA. To measure the sleep currents you should use a multimeter. Please have a look at Tutorial 4: Sleep modes current measurement tutorial from our BLE portal in order to see how to measure currents in extended sleep mode.

Thanks, PM_Dialog

blebot
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Hi Dialog ,

Hi Dialog ,

We are not having a precision current meters as of now , we have a doubt that the FLASH MEMORY is consuming the current . and we have seen a spi_flash_power_down() function in SDK .
1. What did the function do ?
2.Does it have any impact on the power consumption ?
3.Can we power down the FLASH MEMORY after the device start up ?
4.What are the best ways to reduce the power consumption ?

PM_Dialog
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Hi blebot,

Hi blebot,

  1. The spi_flash_power_down function send the Power-Down instruction, so you can power off the SPI flash.
  2. If you are using the SPI Flash, yes, the power consumption will be higher.
  3. The best wake is to power down the SPI flash by using the spi_flash_power_down function. You can call it into the user_app_init(0 callback function.

Thanks, PM_Dialog

blebot
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Hi Dialog ,

Hi Dialog ,

Can we know how much current can be consumed by the spi flash , because after using the spi_power_down function the current reduced is only 0.008 mA (8 uA) .
we are still getting more than 100uA . if i'm not wrong the spi_power_down changes the state of CS pin of the flash and how does that power down the flash and stop that from
consuming current .
Note : we are using DA145850DEVKT-P_VB and Smart snippet tool .(Because we don't have precision meter as of now).
Thanks,
blebot.

PM_Dialog
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Last seen: 20 hours 9 min ago
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Hi blebot,

Hi blebot,

Could you please describe the procedure you are following in order to measure the sleep currents? As it is mentioned in my previous post, it is NOT RECOMMENDED to use the SmartSnippets toolbox in order to measure currents lower than 100μA.

Thanks, PM_Dialog