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Old 15th February 2016, 12:45 AM   #11
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Pretty much final.

Click the image to open in full size.

2Vrms Line-Driver (TI DRV603) with MFB-Filter (25kHz passband) and cap-free output
Ground-Loop-Breaker-Resistor implementation
5 buttons
GPIO-Extender/Breakout-Connector on bottom side
I2S/SPI with 1.8V -> 3.3V level-shifter
USB-Audio
Diff-In
Diff-Out
SE-Out

Power-Options:

Option1:
Flybuck 950kHz (6-42Vin -> 3.3Vdigital + isolated 3.3Vanalog)

Option2:
Flybuck-bypass via HV-LDO (5-36Vin -> 3.3Vdigital + nonisolated 3.3Vanalog),
USB 5.0V
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Old 15th February 2016, 02:20 AM   #12
orto is offline orto  United States
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Wow, that is a luxurious ride for those CSR chips. If you ever make a run of these boards I would be interested. I've been trying to make a jig so I can program these chips, it would be nice to be able to just solder them onto a board.
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Old 15th February 2016, 03:06 AM   #13
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Yeah, the board actually features different options to populate, as I haven't evaluated what level of clean power and isolation is really needed. So half of the stuff is optional. There's also a lot of capacitance which may can get consolidated. But better having all options first than doing 3+ iterations of the design, being always behind the demand. I'll surely do a small 10 PCB batch.

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Old 6th March 2016, 12:16 AM   #14
Dmtr is offline Dmtr  Russian Federation
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Hey. Can I connect the module csr8645 via i2s for external dac? So what to do?

Last edited by Dmtr; 6th March 2016 at 12:31 AM.
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Old 7th March 2016, 08:59 PM   #15
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That's really a fine job with that PCB for CSR chip. Got luck of testing the board yet?
One question, if you allow, doctormd - what is the value of R4 and R11 resistors on your diagram in the LM358 input?
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Old 24th March 2016, 10:43 AM   #16
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Hello
I have this module too, and i thing about setup i2s in my project.
Now questions:
- how to connect to this device (using special programmer?)
e.g.
CSR uEnergy SPI Programmer Board Kit - Broadband

- is it possible to connect via uart?
- how to or is it possible to setup GPIO to e.g led driver, key or different usage?
- anybody have sdk for this module to write some firmware?

Regards
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Old 22nd April 2016, 09:22 AM   #17
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Quote:
Originally Posted by Dmtr View Post
Hey. Can I connect the module csr8645 via i2s for external dac? So what to do?
Haven't tested yet, but it is supposed to work like so.

Quote:
Originally Posted by DeeFiler View Post
That's really a fine job with that PCB for CSR chip. Got luck of testing the board yet?
One question, if you allow, doctormd - what is the value of R4 and R11 resistors on your diagram in the LM358 input?
The resistor where meant to symmetrize the inputs and are optional. The concept is skipped in the actual implementation as i use a diff/se linedriver.

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Old 22nd April 2016, 09:27 AM   #18
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Nice.
I stiil working to setup this module streaming via i2s, no results.
A tested wt32 and working ok, csr8645 still silence on i2s ports..
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Old 22nd April 2016, 12:07 PM   #19
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Have you checked for any clock signals on the data lines?

The WT32 should work with the same tools, so you might compare the set PSKEYs.

Last edited by doctormord; 22nd April 2016 at 12:13 PM.
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Old 22nd April 2016, 12:32 PM   #20
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I have connected analyzator to spi and i see transmision, when switch to ground PCM pin, no signal on all spi/pcm.
Shared clock-clock, miso-data, cbs-sw, correct?
I got all spi pins on analyzator.
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