LPC553x tADCSTUP

[Bela1]

Ladies and Gentlemen,

I am studying the datasheet (LPC553x Product data sheet, Rev. 5.0 – 7. March 2024) and the Reference Manual (LPC553x Reference Manual, Rev. 3, 07/2023) of LPC3356JBD100. This is the chip I am planning to use.

There’s a parameter I cannot find. It is: tADCSTUP. It must be known because it is necessary for properly setting the ADC up.

However, google has found something in the datasheet of LPC55S6x Product data sheet (Rev. 2.4 — 8 December 2022), Table 12.2, page 105, there’s a tADCSTUP parameter, it is 5usec.

Is this 5usec also true for LPC5536JBD100?

How can I find the proper parameter for my chip?

Thank You in advance.

[Pavel_Hernandez · Accepted solution]

Hello, thanks for your waiting I have confirmed with the internal department, that the tADCSTUP value is 5us in LPC553x.

Best regards,
Pavel

[Bela1]

Thank You Pavel, everything seems to be clear now.

You can close this issue, thanks for the help.

[Bela1]

Hallo Pavel,

things are getting clear now. As I understand, signal SWO may not be either on PIO0_8 or on PIO0_18 at the time of reset, the uC can be reprogrammed and debugged without this signal. It's OK.

The signals Tracedata0 ..Tracedata3 and TraceCLK are also not absolutely necessary, they can be used as regular I/O.

I will route my board accordingly, and I do hope it will perform well. Thank You for the help.

[Pavel_Hernandez]

Hello, my name is Pavel, and I will be supporting your case, let me get into your case and when I have more information, I will contact you.

Best regards,
Pavel

[Bela1]

Hallo Pavel,

thank You in advance for Your support. At the moment - since a few days - I am digging myself into the HW development with the microcontroller LPC5536JBD100. The environment I will use: MCUXpresso IDE, MCU-LINK PRO and my own HW board with LPC5536JBD100. To begin the FW development I also have an LPC5536-EVK but I do not plan long time with this evalboard, just until my own HW arrives. All the HW are recently purchased, and all the SW tools are new installed.

I have more than one question, all regarding LPC5536JBD100. Let me go just one by one.

The first one is: where can I find the parameter tADCSTUP? I cannot find it in the datasheet (LPC553x Product data sheet, Rev. 5.0, 7. March 2024 is what I have).

This parameter defines, how long is the minimum time, one has to wait after switching the ADC ON. It is necessary for the internal analog signals to set their final value. My opinion is, this parameter must be in Table 46 (Page 124-125) but it isn't there and I don't find it anywhere else.

Question two: I am a bit confused, due to the connection of SWD signals. I do have the AN13707 and the datasheet, and NXP's MCUXpresso Config tool, V15.0, too.

Signal SWO is routed to PIO0_8 and also to PIO0_18. Which one is best to use? The debugger must work right at the very first power-up, because the first FW must be somehow downloaded into the processor.

Question three: How can I use the Tracedata signals? I don't see any example neither in datasheet, in RefManual or in appnotes, too. Aren't they necessary for debugging?

[Pavel_Hernandez]

Hello, I´m asking the internal department the first question I noticed the same the time analog is missing. 

for the other 2 questions about the SWO, there is nothing special.

But if you want to use it for other purposes maybe this could interest you, the PIO8 (2) and PIO18 (4).

Let me get more information from the last question.

Best regards,
Pavel