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Forum Index : Microcontroller and PC projects : H7 DevEBox core temp 50 Deg C

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Glen0
Regular Member

Joined: 12/10/2014
Location: New Zealand
Posts: 95
Posted: 02:05am 25 Jan 2025
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OPTION LIST
ARMmite H7 MMBasic Version 5.07.02b1
OPTION SDCARD 79

> LIST ALL
'H7 Core Temp Test
Do
CORE = Pin("TEMP" )
Pause 100
Print  CORE
Pause 10000
Loop
> RUN
49.58572498
50.06488645
50.16471175
50.06488645
50.08485151
50.12478163
>

Is a core temperature of 50°C normal?. Ambient temperature in the room is about 23°C.
Am I using the latest Firmware?


 
disco4now

Guru

Joined: 18/12/2014
Location: Australia
Posts: 1000
Posted: 05:36am 25 Jan 2025
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I am a bit suspicious on the readings. I have a DevEBox and a WeAct board.

See the WeAct log below. This starts at 31 minutes and goes for about 8 minutes. It is showing Temp and BAT. You see at 32:02  I have sprayed it with circuit board cleaner and it went to around 25 degrees. Over the next 8 minutes it return to about where it was before being cooled and stabilised, but was obviously wrong as it heated up and return to its previous temperature the reading are nowhere near linear. (134 degrees would be pretty hot).
The DevEBox was similar. I will have to look further at it and see what the Nucleo board does.





39.74538193    00:31:11
3.179803159
39.84523215    00:31:21
3.180004578
39.80529206    00:31:31
3.179803159
39.84523215    00:31:41
3.180407416
39.84523215    00:31:51
3.163286793
28.14278582    00:32:02
3.162078279
31.83724413    00:32:12
3.147576104
25.30703944    00:32:22
3.149590295
30.07988018    00:32:32
3.147374685
34.79281078    00:32:42
3.146569009
38.86669995    00:32:53
3.147978943
42.14178732    00:33:03
3.146166171
45.99600599    00:33:06
3.144957656
52.64603095    00:33:06
3.142943465
58.93659511    00:33:06
3.141533532
65.08736895    00:33:06
3.13972076
70.11982027    00:33:06
3.136296635
77.20918622    00:33:06
3.132469673
87.97304044    00:33:06
3.126829938
103.1702446    00:33:06
3.123002976
112.9555667    00:33:06
3.118773175
123.3000499    00:33:11
3.115751888
127.3939091    00:33:22
3.116154726
129.6704943    00:33:32
3.11534905
132.9655517    00:33:42
3.114744793
132.8457314    00:33:52
3.116356146
133.3449825    00:34:03
3.116356146
134.9425861    00:34:13
3.117766079
133.4847728    00:34:23
3.116960403
133.9440839    00:34:33
3.118571756
133.6445332    00:34:43
3.120183108
131.4877683    00:34:54
3.122197299
128.6919621    00:35:04
3.121794461
127.7533699    00:35:14
3.12421149
124.8377434    00:35:24
3.125218585
122.2416375    00:35:34
3.126829938
119.9450824    00:35:45
3.128239872
117.6884673    00:35:55
3.130254063
114.5132302    00:36:05
3.132671092
111.5776335    00:36:15
3.134685283
106.7848228    00:36:25
3.136095216
104.9076385    00:36:36
3.138109407
102.5511732    00:36:46
3.140123598
97.03944084    00:36:56
3.143346304
92.06689965    00:37:06
3.148381781
79.50574139    00:37:17
3.158049897
57.51872192    00:37:27
3.163891051
47.07438842    00:37:37
3.167516594
40.48427359    00:37:47
3.168725109
39.80529206    00:37:57
3.16852369
39.52571143    00:38:08
3.169732204
39.38592112    00:38:18
3.169530785
39.28607089    00:38:28
3.170940719
39.22616076    00:38:38
3.171343557
39.18622067    00:38:48
3.170940719
39.08637044    00:38:59
3.172350652
39.16625062    00:39:09

Latest F4 Latest H7 FotS
 
Glen0
Regular Member

Joined: 12/10/2014
Location: New Zealand
Posts: 95
Posted: 08:42am 25 Jan 2025
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That does look wierd but I think my figures are realistic.
I measured the surface temp for about half an hour and this is what it got up to.
Is there an erase program like flash nuke for this micro.

I think I have another H7 somewhere. If I can find it it I'll test it as well.

What is the latest FW version?






49.70551535
49.74544547
49.72548041
49.70551535
49.74544547
49.76541053
49.76541053
49.74544547
49.76541053
49.74544547
49.78537559
49.78537559
49.78537559
49.76541053
49.72548041
49.76541053
49.74544547
49.76541053
49.76541053
49.72548041
49.72548041

21:17:49 Port: COM20 removed

Disconnected
 
Glen0
Regular Member

Joined: 12/10/2014
Location: New Zealand
Posts: 95
Posted: 04:34am 26 Jan 2025
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Found the other H7 and loaded Version 5.07.02b1.  Measured the surface of the processor, after 30 minutes it got to just over 42°C


CORE = Pin("TEMP" ) results below are from the last 2 minutes
48.08474161
48.12392848
48.12392848
48.18270879
48.12392848
48.18270879
48.08474161
48.10433505
48.12392848
48.12392848
48.20230223
48.18270879

Looks like it's normal for these things run quite warm. I will monitor the temperature when I get it to do some real work.
 
Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 7856
Posted: 09:19am 26 Jan 2025
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If you get nervous put a little sticky heatsink on it. It won't do any harm anyway. Remember, the die temperature is always higher than the package temperature, and that is the most important figure. The package is losing temperature to the board by conduction and the surrounding space by air convection and radiation.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
Glen0
Regular Member

Joined: 12/10/2014
Location: New Zealand
Posts: 95
Posted: 11:15am 26 Jan 2025
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Thanks.
I just thought it might be abnormal and that maybe it was something I had or hadn't done.
The board gets quite warm so cooling will need to be considered if it is to go into a small enclosure where there is little or no ventilation.

Cheers
 
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