LPCxpresso51u68 and deep sleep current consumtion

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LPCxpresso51u68 and deep sleep current consumtion

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omer_tchernicho
Contributor I

hello,

im a new user to the LPC51u68, and using the LPCxpresso51u68 board.

im made a code to measure the current consumption in both deep sleep mode and in active mode with all the peripherals that would run by my application.

before measuring the current consumption, i removed  JS17, JS10 and R72 before mesauring the current.

i connected my current meter between the pins of JP6. all as mentioned in the Xpresso board manual.

i even disconnected R72 and connected JP3.

im using a keysight DMM 34461A for the current measurement.

i tried running both my application and the Utick_wakeup example, all measurements in both applications show me a current consumption of 3.9mA at deep sleep mode.

active mode show current consumption of about 7mA.

what am i missing or doing wrong?

the datasheet shows that the current should in the lower uA area.

thank you

omer

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Alice_Yang
NXP TechSupport
NXP TechSupport

Hello omer,

How about the power_manager project under SDK ?

...\boards\lpcxpresso51u68\demo_apps\power_manager_lpc

BR

Alice

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omer_tchernicho
Contributor I

same.

checked also deep sleep mode in power_manager project under SDK, and it shows current of 3.4ma.

as a next step we even took out the U14 current measure unit, but nothing changed.

any ideas?

omer.

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Alice_Yang
NXP TechSupport
NXP TechSupport

Hello omer,

I using the LPCxpresso51u68 board, just remove JS10, connect current meter to JP6,

run the SDK demo "lpcxpresso51u68_power_manager_lpc", enter deep sleep mode,

the current is 646uA.

pastedImage_1.png


Have a great day,
TIC

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omer_tchernicho
Contributor I

as you can see - thats what i did (even checked for short after).

further more - i took out U14.

also - the datasheet says current consumption max is 182uA in deep sleep mode (page 47 table 17) , where your check shows about 3.5 times that much.

IMG_20190121_113916.jpgIMG_20190121_113844.jpg

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omer_tchernicho
Contributor I

tryied it with another LPCxpresso51u68 board i have. there the mesaure shows 20mA

only took out JS10 and JS17 there, and conected JP6 to current meter

omer

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Alice_Yang
NXP TechSupport
NXP TechSupport

Hello omer,

If want to measure data like datasheet, we need to disable  all clocks of all module.

BR

Alice

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