About Oscillator specification in i.MX6DQ.

[keitanagashima]

Dear All,

Hello. The XTALI Vih spec is below from IMX6DQAEC(Rev.4).

XTALI high-level DC input voltage (Vih) : 0.8 x NVCC_PLL_OUT [Min]

But, the current customer's system was below.

- NVCC_PLL_OUT: 1.1V

- VIH: 0.87V  --> (= 0.79 x NVCC_PLL_OUT)

My customer must remove the 2.2 M-ohm resistor to meet the DC spec.

On the one hand, the 2.2 M-ohm resistor must need for ERR005777 in Chip errata.

[Question]

Is it possible to be permissible the VIH (=0.87V) in MX6DQ?

(Oscillator maker answered that matching is OK and 2.2M-ohm shouldn't be removed for ERR005777.)

Best Regards,

Keita

[Yuri · Accepted solution]

Hello,

  According to Table 2-7 (Oscillator and clock recommendations) of the
"Hardware Development Guide ", XTALI VIL and VIH voltage levels, in the
latest i.MX6 series datasheet concern with External megahertz source,

If feeding an external clock into the device.
   For oscillator :

"Connect a fundamental-mode crystal between XTALI

and XTALO. An 80 Ω typical ESR crystal rated for a

maximum drive level of 250 μW is acceptable.

Alternately, a 50 Ω typical ESR crystal rated for a

maximum drive level of 200 μW may be used. See the

engineering bulletin EB830 on www.freescale.com for

additional options."

Have a great day,
Yuri

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