topic Re: How to use MC9S12ZVL Temperature Sensor in S12 / MagniV Microcontrollers

How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Fri, 31 Jan 2020 07:36:37 GMT

Please tell me how to use S12 MagniV (MC9S12ZVL) TEMPSENSE (Temperature Sensor).

Looking at MC9S12ZVLRM.pdf (MC9S12ZVL Family ReferenceManual and Datasheet),

I couldn't understand how to use it.

If possible, please provide a white paper or sample code.

Thank you!

#S12 MagniV

#MC9S12ZVL

#TEMPSENSE

#Temperature Sensor

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Fri, 31 Jan 2020 13:30:53 GMT

Hello masashi.takahata.nh@j-display.com,

There are two S12ZVL temperature sensors that can be read by the ADC.

The Chip temperature sensor is specified in the S12ZVL RM rev.2.48, Table B-1.

For more information, please refer to

AN3624 S12X Temperature Sensor
Considerations for Using the S12X Temperature Sensor

The ADC temperature sensor is not specified.

Regards,

Daniel

Re: How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Mon, 03 Feb 2020 06:34:39 GMT

Hi, danielmartynek,

Thank you for your reply and information.

I have some questions.
Does this require calibration?
How do I convert ADC values to temperature?
Please let us know if you have sample code.

Best Regards,

Masa

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Mon, 03 Feb 2020 09:29:59 GMT

Hi masashi.takahata.nh@j-display.com,

It can be calculated using this equation (S12ZVL RM rev.2.48, p252)

The slope (dV_ht) is linear and specified in the RM.

The voltage value at 150C Tj is also specified, however, it is only a typical value.

Therefore, yes, it does require calibration as explained in AN3624.

We don't have any example, unfortunately.

Regards,

Daniel

Re: How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Thu, 06 Feb 2020 03:50:51 GMT

Hi danielmartynek‌,

Thank you for your reply.

However, I still don't understand.

I want to measure the ambient temperature.

Precondition:
MC9S12ZVL
M=-40℃ to 125℃
ADC : 12bit

ADC Channel : internal_0 (ADC temperature sensor)

Question1:

Is calibration required for internal_0 (ADC temperature sensor)?

Please tell me how to calibrate.

Question2:

Please tell me how to convert from ADC value to voltage.

I thought it was the formula below, is it correct?
Ta = -40 + (165/4096)*ADC Value

V = 2.4 - (125 - Ta)*0.00525

Regards,

M.Takahata

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Thu, 06 Feb 2020 13:33:06 GMT

Hi M.Takahata,

Both temperature sensors measure the internal junction temperature not the ambient temperature.
The difference between the junction and ambient temperature can be calculated though.
As explained in the AN3624, Section 2.2 Calibration.
S12ZVL RM, A.1.8 Power Dissipation and Thermal Characteristics.

A1.
Yes, the ADC sensor is not specified at all.
An older AN3031 explains more about the calibration in general.
http://www.nxp.com/files/microcontrollers/doc/app_note/AN3031.pdf

A2.
I don’t know what equation you are using there.
You can use the equation from my previous post.

temp = junction temperature
V_HT(temp) = ADC V_in at temp
d_V_HT is specified and linear across the temperature.
V_HT(150) = ADC V_in at 150C Tj. This is specifies as 2.4V, however, this is only the typical value - the actual value can differ, the min and max values are not specified.
And therefore, it needs to be calibrated, as explained in AN3624.

Regards,

Daniel

Re: How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Wed, 08 Apr 2020 02:06:58 GMT

Hi Daniel Martynek,

Thank you for your reply.

Sorry, replies ware late.

However, I still don't understand.

I want to know how to measure junction temperature.

Precondition:
MC9S12ZVL
M=-40℃ to 150℃
ADC : 12bit

ADC Channel : internal_0 (ADC temperature sensor)

Question1:

It's setting ADC of ProcessorExpert.
Is it correct?

Question2:

Please tell me how to convert from ADC value to voltage.

I thought it was the formula below, is it correct?
Tj = -40 + ((40+150) / 4096) * ADC Value

Vj = 2.4 - (150 - Tj) * 0.00525

Is the relationship between temperature and voltage correct in the following?

Temp(℃)	Voltage(V)
-40	1.4025
-39	1.40775
-38	1.413
-37	1.41825
-36	1.4235
-35	1.42875
-34	1.434
-33	1.43925
-32	1.4445
-31	1.44975
-30	1.455
-29	1.46025
-28	1.4655
-27	1.47075
-26	1.476
-25	1.48125
-24	1.4865
-23	1.49175
-22	1.497
-21	1.50225
-20	1.5075
-19	1.51275
-18	1.518
-17	1.52325
-16	1.5285
-15	1.53375
-14	1.539
-13	1.54425
-12	1.5495
-11	1.55475
-10	1.56
-9	1.56525
-8	1.5705
-7	1.57575
-6	1.581
-5	1.58625
-4	1.5915
-3	1.59675
-2	1.602
-1	1.60725
0	1.6125
1	1.61775
2	1.623
3	1.62825
4	1.6335
5	1.63875
6	1.644
7	1.64925
8	1.6545
9	1.65975
10	1.665
11	1.67025
12	1.6755
13	1.68075
14	1.686
15	1.69125
16	1.6965
17	1.70175
18	1.707
19	1.71225
20	1.7175
21	1.72275
22	1.728
23	1.73325
24	1.7385
25	1.74375
26	1.749
27	1.75425
28	1.7595
29	1.76475
30	1.77
31	1.77525
32	1.7805
33	1.78575
34	1.791
35	1.79625
36	1.8015
37	1.80675
38	1.812
39	1.81725
40	1.8225
41	1.82775
42	1.833
43	1.83825
44	1.8435
45	1.84875
46	1.854
47	1.85925
48	1.8645
49	1.86975
50	1.875
51	1.88025
52	1.8855
53	1.89075
54	1.896
55	1.90125
56	1.9065
57	1.91175
58	1.917
59	1.92225
60	1.9275
61	1.93275
62	1.938
63	1.94325
64	1.9485
65	1.95375
66	1.959
67	1.96425
68	1.9695
69	1.97475
70	1.98
71	1.98525
72	1.9905
73	1.99575
74	2.001
75	2.00625
76	2.0115
77	2.01675
78	2.022
79	2.02725
80	2.0325
81	2.03775
82	2.043
83	2.04825
84	2.0535
85	2.05875
86	2.064
87	2.06925
88	2.0745
89	2.07975
90	2.085
91	2.09025
92	2.0955
93	2.10075
94	2.106
95	2.11125
96	2.1165
97	2.12175
98	2.127
99	2.13225
100	2.1375
101	2.14275
102	2.148
103	2.15325
104	2.1585
105	2.16375
106	2.169
107	2.17425
108	2.1795
109	2.18475
110	2.19
111	2.19525
112	2.2005
113	2.20575
114	2.211
115	2.21625
116	2.2215
117	2.22675
118	2.232
119	2.23725
120	2.2425
121	2.24775
122	2.253
123	2.25825
124	2.2635
125	2.26875
126	2.274
127	2.27925
128	2.2845
129	2.28975
130	2.295
131	2.30025
132	2.3055
133	2.31075
134	2.316
135	2.32125
136	2.3265
137	2.33175
138	2.337
139	2.34225
140	2.3475
141	2.35275
142	2.358
143	2.36325
144	2.3685
145	2.37375
146	2.379
147	2.38425
148	2.3895
149	2.39475
150	2.4

Regards,

M.Takahata

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Wed, 08 Apr 2020 12:08:10 GMT

Hello M. Takahata,

A1.

In the screenshot, the ADC temperature sensor is selected which is a sensor that is not specified at all.

A2.

You are using the equation and the specification of the VREG temperature sensor.

So, you need to select it in the PE.

Please make sure that the sensor is enabled and selected in the CPMUHTCTL register.

I haven't found it in the PE.

The calculation is correct.

But please understand that the V_HT(150) specification is just a typical value.

The min. and the max. values are not specified and they can differ from the typical value significantly.

Therefore, the sensor needs to be calibrated.

Regards,

Daniel

Re: How to use MC9S12ZVL Temperature Sensor

kef2 — Wed, 08 Apr 2020 12:56:54 GMT

Hello Daniel Martynek,

I've question regarding High Temperature Trimming Register, CPMUHTTR. Are HTTR3 to HTTR0 bits factory trimmed? HTTR3 to HTTR0 reset value is loaded from flash. Reset = F in CPMUHTTR register description and HTTR bits seem being loaded as advertised from Flash IFR (at 0x1FC0B9 on S12ZVC, which I'm using). Parts I saw have all ones in HTTRx. If I set HTOE=1 calculated Tj seems being little off, but not tens of degrees. So it's not clear a bit. From one side trim value seems being OK because no room to make it any higher, but is it actually trimmed or indeed it is just a default blank or erased flash value?

Thanks,

Edward

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Thu, 09 Apr 2020 13:27:58 GMT

Hello Edward,

It is not factory trimmed, this is just an erased flash.
As far as I know, there were some samples with 0x8 default value, but it was not trimmed.
The trimming is used to adjust the high-temperature interrupt level.

BR, Daniel

Re: How to use MC9S12ZVL Temperature Sensor

kef2 — Thu, 09 Apr 2020 14:19:21 GMT

Hello Daniel,

Thanks. I see that HTTR trimming value affects temperature sensor readings as well, quite a lot.

Edward

Re: How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Fri, 10 Apr 2020 00:45:40 GMT

Hi Daniel Martynek,

Thank you for your reply.

I used the DEVKIT-ZVL128, selected VREG_Temp_Sensor__or__BandGap, set the CPMUHTCTL register and calculated, it was close to room temperature.

Question1:

In your comment, I haven't found it in the PE. What is PE?

Question2:

Please tell me how to Calibration?

Question3:

If the HTOE bit of the CPMUHTTR register is set to 1, is HTTR a temperature offset?

How should I set HTTR?

Does it affect only the offset?
Or does it affect both offset and slope?

In that case,
When HTTR = 0h, Untrimmed, 5.05mV / ℃.
When HTTR = 8h, Trimmed, 5.25mV / ℃.
When HTTR = Fh, Trimmed, 5.45mV / ℃.

Is it correct?

Regards,

M.Takahata

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Tue, 14 Apr 2020 09:58:03 GMT

Hello masashi.takahata.nh@j-display.com,

A1.

I meat the Processor Expert GUI.

I believe this is well explained in AN3624 S12X Temperature Sensor.

A2.

Section 2.2 Calibration

A3.

The trimming affects the high-temperature interrupt (HTI) assert level as well not only V_HT(temp).

The HTI level is specified at VREGHTTR = 0x88 only.

No, the dV/dT is not influenced by the value in of the VREGHTTR register.

Regards,

Daniel

Re: How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Wed, 15 Apr 2020 01:15:21 GMT

Hi Daniel Martynek,

Thank you for your reply.

I want to use MC9S12ZVL.

Question1:

The description of HTTR register is different between MC9S12ZVL Datasheet(CPMUHTTR) and AN3624(VREGHTTR).

Does the MC9S12ZVL CPMUHTTR have a VHT offset?

"MC9S12ZVL Family Reference Manual and Datasheet" is CPMUHTTR.

AN3624 is VREGHTTR.

Question2:

There is CPMUHTTR = 0x88 on page 696 of the data sheet. What is it related to?

Regards,

M.Takahata

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Thu, 16 Apr 2020 12:30:28 GMT

Hi masashi.takahata.nh@j-display.com,

A1.

These are just different register names.

MagniV and S12(X) have the same sensor.

A2.

When HTTR is trimmed to 0x8 and HTOE = 0x1, T_HTIA / T_HTID are specified as follows:

Regards,

Daniel

Re: How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Fri, 17 Apr 2020 00:49:11 GMT

Hi Daniel Martynek,

Thank you for all your support.

Trimming Effect of HTTR description varies slightly depending on the specifications.

Tell me more about Trimming effect of HTTR in "MC9S12ZVL Family Reference Manual and Datasheet".

Question1:

If HTIE is 0, HTTR is Temperature sensor voltage VHT?
If HTIE is 1, HTTR is Interrupt threshold temperatures THTLA and THTID? Or is it both?

Question2:

If HTIE is 1 and HTTR is 0x88, the following values are Typical, which means it can be adjusted by HTTR setting?

(Interrupt threshold temperatures THTIA and THTID.)

Regards,

M.Takahata

Re: How to use MC9S12ZVL Temperature Sensor

danielmartynek — Wed, 22 Apr 2020 11:00:29 GMT

Hi masashi.takahata.nh@j-display.com,

A1.

If HTOE = 1, HTTR shifts both V_HT(temp) and THTLA and THTID.

If HTIE is 0, the high-temperature interrupt is not generated when the temperature reaches THTIA.

if HTIE is 1, the high-temperature interrupt is generated when the temperature reaches THTIA.

A2.

Yes,

Regards,

Daniel

Re: How to use MC9S12ZVL Temperature Sensor

masashi_takahat — Thu, 23 Apr 2020 00:56:06 GMT

Hi Daniel Martynek,

Thanks.

I understand about HTTR.

Regards,

M.Takahata