https://uk.farnell.com/microchip/pi...-pic18-40mhz-dip-40/dp/1292280?CMP=GRHB-SF-FC

 

https://uk.farnell.com/microchip/pi...-pic18-40mhz-dip-40/dp/1292280?CMP=GRHB-SF-FC

TS wants TQFP44 not DIP40 package option. I looked from my usual suppliers but they haven't stocked this MCU either, not before July.

 

Can you modify your software to PIC18F46K20? It is more reliable at 3.3V then your current MCU.

 

https://uk.farnell.com/microchip/pi...-pic18-40mhz-dip-40/dp/1292280?CMP=GRHB-SF-FC

Hi P,
Thanks for looking.
C

 

Can you modify your software to PIC18F46K20? It is more reliable at 3.3V then your current MCU.

Hi T,
Over this project, I've tried a lot of PICs, starting with 18 PIN Through the hole types.
One of them is PIC18F46K20. I can't remember why I couldn't use it, but it looks perfect. I have some and will investigate further.
Thanks,
C.

 

If you need more:
https://www.distrelec.biz/search?q=Pic18f4620
price 2.64€ + vat + posting + customs?

 

Differences between 4620 and 46K20 are described in this document

 

If you need more:
https://www.distrelec.biz/search?q=Pic18f4620
price 2.64€ + vat + posting + customs?

TS needs LF version, F version works above 4V

 

Differences between 4620 and 46K20 are described in this document

Hi J and T,
I'm getting more sense from this thread, than I did with Microchip this morning

I've downloaded the PDF, thanks, and made a new PCB7, with only the 18F46K20, nearly finished.
C

 

Hi,
Wading through the D/S, and checking the website, I came across this one: file:///D:/TECHNICAL/ELECTRONICS/PIC/PIC%20PDFs/18%20Range/18F23K20%2046K20/PIC18LF26-45-46K40.pdf

This is cheaper and in stock at Microchip, and the D/S is only 822 pages
---------------------------------------------------------
Operating Voltage Ranges:–
1.8V to 3.6V (PIC18LF26/45/46K40)
2.3V to 5.5V ( PIC18F26/45/46K40)
---------------------------------------------------------
Is this a better option?
(As previously mentioned, I'm not best at reading D/S, although improving, I fear mistakes!)

C

 

PIC18F46K40 has more peripherials, for example two serial ports, more ADC channels, hardware limit timer, zero cross detector etc. For motor control (i would choose dsPIC for this) or triac control applications it suits better than K20. But for your system, IMO, is PIC18F46K20 ok.

 

PIC18F46K40 has more peripherials, for example two serial ports, more ADC channels, hardware limit timer, zero cross detector etc. For motor control (i would choose dsPIC for this) or triac control applications it suits better than K20. But for your system, IMO, is PIC18F46K20 ok.

Hi T,
I've had a quick skim through the D/S and think it is all PIN compatible, and think you may be correct, that it will be ok for this project.
18F46K20 is on PCB7, and programmed with the attached.
The LED is flashing, but 8x too slow (Slight adjustment needed somewhere) It is working first with the internal osc, and I haven't checked the settings yet, but assume it's somehere there.
All cool, after 15mins. The 5V reg is warm.
Thanks,
C.

 

For the correct frequency you should setup the OSCCON and CONFIG1 registers correctly.
I did not check what the defaults are.

 

For the correct frequency you should setup the OSCCON and CONFIG1 registers correctly.
I did not check what the defaults are.

Hi J,
I changed the program to this:
and now it is flashing correctly.
In OSH there is no HFINTOSC setting, so I used INT.
EDIT: 70-80mA
Thanks, C.

 

Hi,
Previously, with 18LF4620 (Poss because of damage?) some of the PORT PINs showed signals, and voltages. Now only PORTA.2=1.25V, A1=1.25V A0=1.75V.
C.

 

Power on state of PORTA is analog, except RA4. Therefore measuring analog pins with DMM gives random results. If you want set PORTA pins to digital, set corresponding bits in ANSEL register to zero.

 

...


Thanks, C.

...
In OSH there is no HFINTOSC setting, so I used INT.
...

What does this mean?
Can't you set OSCCON register and CONFIG1 to whatever values are needed?

 

Power on state of PORTA is analog, except RA4. Therefore measuring analog pins with DMM gives random results. If you want set PORTA pins to digital, set corresponding bits in ANSEL register to zero.

Hi T,
I set: 'ANSEL = %11111111 'ANS7-0 disabled' but the voltage stayed, I also tried '0's.
NOTE: The voltage only shows on an oscilloscope, but not on and analogue DVM??
C

 

...
In OSH there is no HFINTOSC setting, so I used INT.
...

What does this mean?
Can't you set OSCCON register and CONFIG1 to whatever values are needed?

Hi J,
What does this mean?, see attached.
I'll look at OSCCON and CONFIG1 and try to change them.
EDIT: Attachment added.
Thanks.
C.

 

I set: 'ANSEL = %11111111 'ANS7-0 disabled'

This sets all to analog, to make all digital you must set ANSEL = %00000000