Forums - About output voltage of switch mode regulator of CSR1010

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About output voltage of switch mode regulator of CSR1010
masaki.mukawa.ej
Join Date: 20 Jun 16
Posts: 3
Posted: Mon, 2016-07-04 03:25

Hi

Now I am devlopping software using CSR1010 with custom board.

I used CSR uEnergy SDK 2.3.0.31 on Win7 PC, also transfer software to EEPROM of CSR1010 via SPI bus.

At first, it looks like to work SPI bus, could debug software.

But suddenly,CSR uEnergy SDK 2.3.0.31 couldn't recognize SPI bus,somtimes.

Finally,No longer SDK cloudn't recognize SPI bus.

So, I check signal CSR1010 one by one as below,

  1. DEBUG_CLK,DEBUG_CS,DEBUG_MOSI can observe waveform when operating "Run" at SDK, But there is no waveform of DEBUG_MISO.
  2. SPI_PIO is enabled(3.28V)
  3. Both of XTAL_32K_OUT XTAL_32K_IN oscillated.
  4. VDD_BAT is 3.3V
  5. VDD_BAT_SMPS is also 3.3V
  6. VDD_CORE1 and VDD_CORE2 is only 0.9V
  7. VDD_REG_IN is also only 0.9V
  8. SMPS_LX is also only 0.9V
  9. I removed inductance between SMPS_LX and VDD_REG_IN.
  10. Instead of SMPS_LX, external power 1.35V supply to VDD_REG_IN, then SPI bus become to works!

According to CSR1010 Data Sheet CS-231985-DS.pdf Figure 7.1,

I believe that SMPS_LX is generated by Switch-mode Regulator in CSR1010 based VDD_BAT_SMPS

SMPS_LX should be 1.35V typically.

Is there method why SMPS_LX is only 0.9V?

Although,I don't make sence about Switch-mode Regulator,can output voltage is contorolled by software? 

Best Regards,

Masaki

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masaki.mukawa.ej
Join Date: 20 Jun 16
Posts: 3
Posted: Wed, 2016-07-06 04:40

Hi Dr nissim,

This post is continuation of following post.

https://forum.csr.com/forum/main-category/main-forum/software/69238-csr1...

Would you please teach me that what should I invetigate?

Best Regards,

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masaki.mukawa.ej
Join Date: 20 Jun 16
Posts: 3
Posted: Fri, 2016-07-15 06:53

Hi CSR support team,

For this Switch-mode regulator issue, I consider several cause.

Is there possiblity of regulator mulfunction for CSR1010 if I misoperation as follows.

  1. if software was not transfered to EEPROM via CSR1010 SPI bus,then set wrong value to register of Switch-mode regulator.
  2. if VDD line is short-circuit-ed with other signal lines(UART-TX,UART-RX,SPI-BUS and WAKE)  when running CSR1010.
  3. Electrostatic discharge damage from signal lines of CSR1010.

As a hypothesis,

If i short-circuited VDD to other signal pins,when VDD power is supplying,

3.3V of IO power line in CSR1010 voltage is down,

reverse power flow is ocuured from circuit of 1.35V to circuit of 3.3V via protection circuit. (unexcpect behaivor for CSR1010),

also over current on 1.35V DC-DC does break internal transister as short-mode.

As a result, over voltage supplied to CSR1010 and working protection curcuit,DC-DC regulator is stopped,

I only look 0.9V internal voltage borken circuit....

Is there such a possiblity?

Please, any reply.

If I should post this question at other forum, please tell me.

Best Regards,

Masaki,

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Dr. Nissim Zur
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Join Date: 6 Jun 16
Location: Skype: nissim.test CSR1010 External design house
Posts: 235
Posted: Sat, 2016-07-23 00:43

You can call my Skype nissim.test so I can help. 

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