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Tonight I swapped the power supply connections, so the lithium cell was connected to V CC2 primary and the bench supply was connected to V CC1 backup. The read failures still occurred when the chip was running off of 5V; so the problem had to be associated with voltage, not supply pin.
Curiously, it took four diodes to drop 1. To paraphrase Captain Barbosa, we like to think of. The knee of the curve is the point at which slight increases in voltage across the diode result in rapidly increasing current. Conversely, if the diode current is externally limited below the level of the knee, the voltage drop across it can be less than. I seem to recall doing a lab on this at PSU. It needs to be more than 3.
The burst write now works, so I can set the date and time with a single function call. I can only speculate that whatever was screwing up the reads was also screwing up burst writes.
That is, everything now works on the DS You can follow any responses to this entry through the RSS 2. You can leave a response , or trackback from your own site. I know this is 4 years too late, but just wanted to mention that the write failures could be due to input voltage tolerances on the data pins, in regards to supply voltage. Name required. Mail will not be published required. Notify me of followup comments via e-mail. Keith's Electronics Blog. Best of All, The burst write now works, so I can set the date and time with a single function call.
October 9, at am. Keith Neufeld says:. October 14, at pm. Leave a Reply Click here to cancel reply.
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