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About DDR3 Vref current consumption in i.MX6DQ.

Question asked by Keita Nagashima on Jan 25, 2016
Latest reply on Feb 2, 2016 by Yuri Muhin

Dear Sir or Madam,

 

I have questions about Vref current consumption in i.MX6DQ.

My customer will tie DDR_VREF to a precision external resistor divider.

 

[Q1]

We referred to the Table 2-1. DDR recommendations, Table 2-15. DDR Vref resistor sizing guideline in i.MX6DQHDG(Rev.1).

The input current on DRAM_VREF pin became microampere order when computing by this way of external resistor divider.

But, the i.MX6DQ's Vref requires max "1mA" from Table 8. Maximum Supply Currents in IMX6DQCEC(Rev.4).

In case of using way of external resistor divider for VREF, how much current is i.MX6 Vref necessary actually?

 

[Q2]

Do you have the spec of IIH and IIL for DRAM_VREF pin?

 

[Q3]

Do you have the document of external resistor divider technique?

 

Best Regards,

Keita

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