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LPC54608 Internal temperature sensor

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LPC54608 Internal temperature sensor

星期二
78 次查看
Sai123_s
Contributor I

I tried to configure ADC for internal temperature sensor as given in LPC54608 user manual, but i couldn't read correct values. I used the slope, offset values given in data sheet also.

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星期二
43 次查看
luis_maravilla
NXP Employee
NXP Employee

Hello

Could you help us confirm if you have used an example for the ADC as a base? If so, indicate which;

Have you configured the input ADC Channel 0 and Input Select Register as 3 so you can select temperature sensor?

For more detailed information, kindly refer to Chapter 44.6.2 in LPC546xx User manual[UM10912]

If you could bring more details about, how did you configure the ADC temperature sensor, please.

 

According to LPC546xx Product data sheet Chapter 7.22,

"After power-up, the temperature sensor output must be allowed to settle to its stable value before it can be used as an accurate ADC input. For an accurate measurement of the temperature sensor by the ADC, the ADC must be configured in single-channel burst mode. The last value of a nine-conversion (or more) burst provides an accurate result." Therefore, it could be that your Temperature sensor is not settle yet or you need to make more conversions in single channel burst mode.

 

You also should consider optimize the ADC external circuit to minimize the ADC error related to external environment.

This Application Note can help you in How to Increase the Analog-to-Digital Converter Accuracy in an Application

Best Regards, Luis

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8 小时之前
5 次查看
Sai123_s
Contributor I

I have configured in the following manner:

1. Cleared ADC, VREFP, VDDA, TS, ANA & wait for 20us

2. ADC clock enable, AHBCLKCTRL0.

3. Clear the ADC0 peripheral reset using the PRESETCTRL0 register

4. set temperature channel in INSEL

5. Enable ADC & set clock to 15MHz using CLKDIV in ctrl register

5. Set Synchronous mode , 12-bit resolution, BYPASS = 0, TSAMP = 0

6. then configures sequence A in SEQA_CTRL, CHANNELS = 1, TRIGGER = 0, TRIGPOL = 0, SYNCBYPASS = 0, BURST = 0, SINGLESTEP = 0, LOWPRIO = 0, MODE = 0, SEQA_ENA = 1

7. SET CALIB = 1 & waited till CALIB = 0

8. then started conversion by START bit, read result

but result is same everytime & DATA VALID is not setting.

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