Hello
We supply our borad over the DCDC_BATT Pin with 3.3V (from DCDC). We use following configuration:
When the borad powerd with 3.3V we have a reset during the barebox is starting. We can increase the FRAC_CPUFRC to 28 or HBUS_DIV to 8 and the Linux starts normally.
When we power our board with 3.8V we have no problems. The Linux starts with the fastest clock configuartion.
Vbat and VCC_Logik (confusing name I now) are connected. What is the problem?
Best regards
Peter
解決済! 解決策の投稿を見る。
Yes, You may look at Table 13 (Power Supply Characteristics) of the Datasheet
(IMX28CEC, Rev. 3, 07/2012) :
DCDC_VDDA Maximum Output Current (VDDA = 1.8 V) = 200 mA
~Yuri.
According to footnote of Table 8 (Recommended Power Supply Operating Conditions)
of the i.MX28 Datasheet(s) :
"With external loadings (for example, one DDR2 device and SD Card/NAND Flash),
MX28 PMU was tested at BATT/DCDC_BATT > 3.30 V".
So, BATT/DCDC_BATT > 3.30 may be recommended.
Have a great day,
Yuri
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
Hello
Denotes the DCDC_BATT is for 3.3V supply unusable?
Best regards
Peter
In the case, the issue may be caused because of really high (external) load.
Also, special software configuration should be applied here ; please take a look at
section 4.1.1.2 (DCDC_BATT source only: software configuration) of the app note AN4199.
http://cache.freescale.com/files/32bit/doc/app_note/AN4199.pdf
~Yuri.
We supply only a NAND Flash and DDR2 Memory on 1.8V over the imx. I check the consumption.
Best regards
Peter
Peter, good day !:
Is it possible for test purposes to power DDR2 separately (from an external source)?
~Yuri.
Hello Yuri
I measured the 1.8V path and de current was about 235mA... And thats probable to mutch.
We use:
Flash: SPANSION S34MS01G100BHI000
RAM: SAMSUNG K4T1G164QF--BCE6000
Peter
Yes, You may look at Table 13 (Power Supply Characteristics) of the Datasheet
(IMX28CEC, Rev. 3, 07/2012) :
DCDC_VDDA Maximum Output Current (VDDA = 1.8 V) = 200 mA
~Yuri.