Smart plug energy monitoring chip

Clifford Heath

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Sep 23, 2019, 8:28:12 PM9/23/19

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Does anyone recognise this energy monitoring chip? The marking I see is
"1852AVH":

<https://www.dropbox.com/s/pzf0km6m85c0a1s/SmartPlugEnergyChip2.jpg>
<https://www.dropbox.com/s/46sl5cxqapm9v4r/SmartPlugEnergyChip3.jpg>

It's in an Aldi (Medion brand) WiFi smart plug.

Clifford Heath.

Jeff Liebermann

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Sep 23, 2019, 9:22:06 PM9/23/19

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On Tue, 24 Sep 2019 10:28:09 +1000, Clifford Heath
<no....@please.net> wrote:

>Does anyone recognise this energy monitoring chip? The marking I see is
>"1852AVH":
><https://www.dropbox.com/s/pzf0km6m85c0a1s/SmartPlugEnergyChip2.jpg>
><https://www.dropbox.com/s/46sl5cxqapm9v4r/SmartPlugEnergyChip3.jpg>

The "8" is really a "B". Try 1B52AVH instead.
Some image enhancement:
<http://www.learnbydestroying.com/jeffl/crud/1B52AVH.jpg>
Unfortunatly, I couldn't find anything with that part number using
Google search.

>It's in an Aldi (Medion brand) WiFi smart plug.

Model number? Photo? Any patent numbers in the docs?

I couldn't find the logo:
<https://www.elnec.com/en/support/ic-logos/?method=logo>
<http://www.siliconinvestigations.com/Logos/logos.htm>
<http://www.ecadata.de/herst/myshowlogo.php?F_SPRACHE=2>

I don't know if this is the same product, but it's easy enough to try:
"Kankun Runs on OpenWrt firmware"
<http://www.htlinux.com/kankun-runs-on-openwrt-firmware/>

--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Clifford Heath

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Sep 23, 2019, 10:43:16 PM9/23/19

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On 24/9/19 11:21 am, Jeff Liebermann wrote:
> On Tue, 24 Sep 2019 10:28:09 +1000, Clifford Heath
> <no....@please.net> wrote:
>> Does anyone recognise this energy monitoring chip? The marking I see is
>> "1852AVH":
>> <https://www.dropbox.com/s/pzf0km6m85c0a1s/SmartPlugEnergyChip2.jpg>
>> <https://www.dropbox.com/s/46sl5cxqapm9v4r/SmartPlugEnergyChip3.jpg>
> The "8" is really a "B". Try 1B52AVH instead.

I tried that too, but (see 2nd image) I'm pretty sure it's an "8".

Anyhow more searching and it looks like someone has figured it out and
ported Tasmota to it, and they call it a BL0937 (first line of text, not
second). Still can't find a data sheet but there's a driver here. Same
code for HJL-01 which looks a lot like an HLW8012 supposedly:
<https://github.com/arendst/Sonoff-Tasmota/blob/development/sonoff/xnrg_01_hlw8012.ino>

>> It's in an Aldi (Medion brand) WiFi smart plug.
> Model number? Photo? Any patent numbers in the docs?

"Medion LIFE+ Smart Plug", S85225, model number MD 93225.
It says it's compatible with Alexa and Google Home.
Similar is available here:
<https://www.ebay.com.au/itm/Smart-Plug-S85225-Compatible-with-Amazon-Alexa-Medion-Wifi-Life-Google-Home-/401785952652>

> I couldn't find the logo:

Me either :(.

> <https://www.elnec.com/en/support/ic-logos/?method=logo>
> <http://www.siliconinvestigations.com/Logos/logos.htm>
> <http://www.ecadata.de/herst/myshowlogo.php?F_SPRACHE=2>

Thanks,

Clifford Heath.

Jeff Liebermann

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Sep 24, 2019, 12:55:01 AM9/24/19

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On Tue, 24 Sep 2019 12:43:11 +1000, Clifford Heath

<no....@please.net> wrote:

>On 24/9/19 11:21 am, Jeff Liebermann wrote:
>> On Tue, 24 Sep 2019 10:28:09 +1000, Clifford Heath
>> <no....@please.net> wrote:
>>> Does anyone recognise this energy monitoring chip? The marking I see is
>>> "1852AVH":
>>> <https://www.dropbox.com/s/pzf0km6m85c0a1s/SmartPlugEnergyChip2.jpg>
>>> <https://www.dropbox.com/s/46sl5cxqapm9v4r/SmartPlugEnergyChip3.jpg>
>> The "8" is really a "B". Try 1B52AVH instead.
>
>I tried that too, but (see 2nd image) I'm pretty sure it's an "8".

I beg to differ. Take another look at my image at:
<http://www.learnbydestroying.com/jeffl/crud/1B52AVH.jpg>
Notice that the "B" in "BL" on the first line is exactly the same as
the "B" on the 2nd line.

>Anyhow more searching and it looks like someone has figured it out and
>ported Tasmota to it, and they call it a BL0937 (first line of text, not
>second).

Oops. I didn't think of that.

>Still can't find a data sheet but there's a driver here. Same
>code for HJL-01 which looks a lot like an HLW8012 supposedly:
><https://github.com/arendst/Sonoff-Tasmota/blob/development/sonoff/xnrg_01_hlw8012.ino>

I don't think so. Looking at the circuitry around the chip, it looks
like some kind of analog device, not a energy monitor, which usually
has an SPI bus and talks digital. Googling for BL0937, I find an
analog current regulator:
<https://lcsc.com/product-detail/PMIC-Current-Regulation_BL0937_C94616.html>
If you zoom into the photo on the above page, it looks exactly like
your two photos.

More:
<https://www.google.com/search?q=BL0937&tbm=isch>

>>> It's in an Aldi (Medion brand) WiFi smart plug.
>> Model number? Photo? Any patent numbers in the docs?
>
>"Medion LIFE+ Smart Plug", S85225, model number MD 93225.
>It says it's compatible with Alexa and Google Home.
>Similar is available here:
><https://www.ebay.com.au/itm/Smart-Plug-S85225-Compatible-with-Amazon-Alexa-Medion-Wifi-Life-Google-Home-/401785952652>

>> I couldn't find the logo:
>
>Me either :(.

Foundit. It's Shanghai Belling Co., Ltd., formerly known as Shanghai
Belling Microelectronics Manufacturing Co., Ltd:
<https://lcsc.com/brand-detail/158.html>
Notice the logo at:
<https://assets.lcsc.com/images/manufacturer/158.jpg>

Clifford Heath

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Sep 24, 2019, 1:26:59 AM9/24/19

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On 24/9/19 2:54 pm, Jeff Liebermann wrote:
> On Tue, 24 Sep 2019 12:43:11 +1000, Clifford Heath
> <no....@please.net> wrote:
>
>> On 24/9/19 11:21 am, Jeff Liebermann wrote:
>>> On Tue, 24 Sep 2019 10:28:09 +1000, Clifford Heath
>>> <no....@please.net> wrote:
>>>> Does anyone recognise this energy monitoring chip? The marking I see is
>>>> "1852AVH":
>>>> <https://www.dropbox.com/s/pzf0km6m85c0a1s/SmartPlugEnergyChip2.jpg>
>>>> <https://www.dropbox.com/s/46sl5cxqapm9v4r/SmartPlugEnergyChip3.jpg>

>> Anyhow more searching and it looks like someone has figured it out and
>> ported Tasmota to it, and they call it a BL0937 (first line of text, not
>> second).
>
> Oops. I didn't think of that.

Well, for some reason the data sheet doesn't come up in Google, but here
it is:
<https://github.com/xoseperez/espurna/files/1861834/BL0937_Datasheet_V1.01.pdf.zip>
or from the manufactorer's site:
<http://www.belling.com.cn/en/product_info.html?id=138>

A differential input (across a 0.001R resistor), a voltage input, both
connected to ADCs and thence to voltage-to-frequency converters. There
are two frequency outputs, and a selector pin for voltage or current on
one of them. The other frequency indicates power; presumably closer to
instantaneous power whereas the I and V can't be read simultaneously.

That matches the pinout of the HLW8012 also, but the select polarity is
reversed or some such nonsense; the driver writer has worked it out
anyhow, see the thread at <https://github.com/xoseperez/espurna/issues/737>.

> I don't think so. Looking at the circuitry around the chip, it looks
> like some kind of analog device, not a energy monitor, which usually
> has an SPI bus and talks digital. Googling for BL0937, I find an
> analog current regulator:
> <https://lcsc.com/product-detail/PMIC-Current-Regulation_BL0937_C94616.html>
> If you zoom into the photo on the above page, it looks exactly like
> your two photos.

Nevertheless that's not it.

>>> I couldn't find the logo:
>> Me either :(.
> Foundit. It's Shanghai Belling Co., Ltd., formerly known as Shanghai
> Belling Microelectronics Manufacturing Co., Ltd:
> <https://lcsc.com/brand-detail/158.html>
> Notice the logo at:
> <https://assets.lcsc.com/images/manufacturer/158.jpg>

Thank you.

Clifford Heath.