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w2hx

3 Posts

Posted - 04/26/2020 :  10:34:37  Show Profile  Reply with Quote
Hello there. I am trying to understand the device location picture. Below is what I get for a dallas one wire chip. What I can't figure out is:
1. what is the meaning of the red #18 pin? Is that supposed to be pin 1 of the chip?
2. There appears to be a gray dot on pin 20. Is this intended to mean pin 1 of the chip?

This chip, DS28EC20, comes in both a TO-92 form factor (like a transistor, and TSOC form factor. I am assuming this depiction on the device location image is attempting to show the TO-92? To the right, there appears to be something attempting to show the flat side and the convex side of the TO-92, but I can't figure out what it is trying to show.

Any help appreciated. thanks
W2HX



Image Insert:

23884 bytes
Reply #1

anniel

2530 Posts

Posted - 04/26/2020 :  10:50:06  Show Profile  Reply with Quote
quote:
Originally posted by w2hx

Hello there. I am trying to understand the device location picture. Below is what I get for a dallas one wire chip. What I can't figure out is:
1. what is the meaning of the red #18 pin? Is that supposed to be pin 1 of the chip?
2. There appears to be a gray dot on pin 20. Is this intended to mean pin 1 of the chip?

This chip, DS28EC20, comes in both a TO-92 form factor (like a transistor, and TSOC form factor. I am assuming this depiction on the device location image is attempting to show the TO-92? To the right, there appears to be something attempting to show the flat side and the convex side of the TO-92, but I can't figure out what it is trying to show.

Any help appreciated. thanks
W2HX



Image Insert:

23884 bytes

That looks like a TO-92 and pin 1 is 20 on the ZIF.
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Reply #2

w2hx

3 Posts

Posted - 04/26/2020 :  11:01:09  Show Profile  Reply with Quote
Thank you, anniel. Can you tell me what the red 18 signifies? I see this for other chips as well? Thanks again
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Reply #3

anniel

2530 Posts

Posted - 04/26/2020 :  11:50:31  Show Profile  Reply with Quote
quote:
Originally posted by w2hx

Thank you, anniel. Can you tell me what the red 18 signifies? I see this for other chips as well? Thanks again


It indicates where the device starts on the ZIF as it is rarely at pin 1.
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Reply #4

w2hx

3 Posts

Posted - 04/26/2020 :  12:19:16  Show Profile  Reply with Quote
aaah. ok thank you!
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Reply #5

anniel

2530 Posts

Posted - 04/26/2020 :  13:35:46  Show Profile  Reply with Quote
quote:
Originally posted by w2hx

aaah. ok thank you!

You're welcome.
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