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Help With Timing Diagram

 
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jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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Help With Timing Diagram
PostPosted: Sun Oct 09, 2005 5:18 pm     Reply with quote

Tomorrow should bring a revised board for my latest on-going project. (Note to self: there is a difference between DIP and SDIP, pay attention next time.)

I am looking at the timing diagram on page 3 of the following datasheet:

http://www.marktechopto.com/PDFs/toshiba/TB62726AN-AF.pdf

Is there a typo or am I not understanding things correctly?

1. Serial data is read at the rising edge of the clock (I can't take credit for that one, someone else answered that for me on a previous post.)

2. A serial H will result in the corresponding LED to be OFF when latched and enabled, a serial L will result in the corresponding LED to be ON when latched and enabled. (?)

If that is correct, the timing diagram is showing a 1010101010101010 being read in, and even numbered LEDs would be OFF and odd numbered ON. HOWEVER, the timing diagram shows:

OUT0: OFF
OUT1: ON
OUT3: OFF (Wrong?)
OUT15: ON

Thanks,

John
jma_1



Joined: 08 Feb 2005
Posts: 147
Location: Wisconsin

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PostPosted: Mon Oct 10, 2005 6:54 am     Reply with quote

Greetings,
I have never used this particular LED driver chip.

1) Yes
2) NO - ASCII H -> 1001000; L-> 1001100
(8 BITS ONLY)
Try sending 01010101 -> ASCII U (send 2 Times; each ASCII character only 8 bits). This should turn on even outputs and off odd LEDS

There appears to be a type-o in the datasheet OUT3 should be labeled OUT2

JMA
jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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PostPosted: Mon Oct 10, 2005 8:03 am     Reply with quote

Sorry, my explanation/question was confusing.

Quote:

2. A serial H will result in the corresponding LED to be OFF when latched and enabled, a serial L will result in the corresponding LED to be ON when latched and enabled. (?)


Would be more accurate/understandable if it read:

2. A serial High (or 1) when the clock is rising will result in the corresponding LED to be OFF when latched and enabled, a serial Low (or 0) when the clock is rising will result in the corresponding LED to be ON when latched and enabled. (?)

That is all I could figure, that it was a typo in the data sheet.

Thanks,

John
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