Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 170 - diyAudio
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Old 16th December 2012, 12:14 AM   #1691
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I searched TI and couldn't find any battery charger IC has battery discharge protection
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Old 16th December 2012, 12:32 AM   #1692
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Ian

The "enable" pin of TPS7A4700 LDO has a under-voltage lockout, by default is 2.5V, connect it to a simple resistor voltage divider may provide the battery protection feature that we want.

Last edited by bigpandahk; 16th December 2012 at 12:37 AM.
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Old 16th December 2012, 12:54 AM   #1693
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Quote:
Originally Posted by bigpandahk View Post
I searched TI and couldn't find any battery charger IC has battery discharge protection
I use linear tech LTC2935, not a charger, but a battery monitor.
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Old 16th December 2012, 09:07 AM   #1694
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Thanks qusp. Actually, we don't need any additional devices to disconnect the battery if we use TPS7A4700. It will lock-out at 2.5V which is higher than 2.1V allowed for LifePo4 battery.
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Old 16th December 2012, 11:50 AM   #1695
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yes but thats hardly a universal solution is it? the TPA is good no doubt, but its bettered by many discrete designs, or plain batteries; I would likely be using batteries to power clock directly
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Old 16th December 2012, 11:22 PM   #1696
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WOW....
My heads spining
I just read 145 Pages !
But still see no mention for HDMI or multi-channel yet :P

Looks good though Ian
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Old 17th December 2012, 12:13 AM   #1697
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Quote:
Originally Posted by Adrculda View Post
WOW....
My heads spining
I just read 145 Pages !
But still see no mention for HDMI or multi-channel yet :P

Looks good though Ian


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Old 17th December 2012, 12:20 AM   #1698
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Quote:
Originally Posted by qusp View Post
yes but thats hardly a universal solution is it? the TPA is good no doubt, but its bettered by many discrete designs, or plain batteries; I would likely be using batteries to power clock directly
There is a battery monitoring connector on the PCB, maybe your can make use of it for now.

But to solve the battery protection problem completely, we need a active battery management board with two groups hot swapble battery and charger working all the time. If the working battery is found to be low, it will be replaced with the other one without stop the music.

Ian
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Old 17th December 2012, 12:31 AM   #1699
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Default Fifo: sujects follow up

After re-reading this thread from the begining up to page 100 I think it would be nice to review some topics already dicussed many months ago here:

1- Ian what is new the total current requirement for SPDIF+DUALCLOCK+FIFO+BAT boards?

2- I want tu use 2 x A123 LiFePO4 battery to power my kit. Voltage is really near the max limit of 6.7V stated in the fifo doc. I expect about 2 to 3 hours of operation for a 400ma consommation.

qups still using your LiFePO4 setup with succes?

3- I have 2 SI570 HAM modules and also purchase upon Ian recommandation the CCHD-957.

Anyone tried the AccuSilcone module mentioned before in this thread?

4- Somes exchanges were about the fifo delay problem for a audio\video setup.

I think the main point was missed, Even for a audiophile setup the first thing to do is simply a disable fifo buffer option. No need to implement some complex algorith. The avantage of using the same HIFI stereo system for both video and audio is a great one even if the video part don't have the jitter reduction feature.

For example I'm using a nice HDMI switch with a SPDIF output so all my audio\video sources can output to my HIFI stereo setup
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Old 17th December 2012, 02:59 AM   #1700
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Quote:
Originally Posted by Adrculda View Post
WOW....
My heads spining
I just read 145 Pages !
But still see no mention for HDMI or multi-channel yet :P

Looks good though Ian
HDMI? not going to happen, licensing rules it out for hobbiest projects.

multichannel? welcome to the line of people poking Ian with a stick
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