Hi All,
I am trying to find out why the ON/OFF pin does drive the PMIC_REQ_ON pin low. I have a button to GND connected to the ON/OFF pin on the IMX6D device. In OFF mode and initial power up, the SNVS is at 3.0V provided by a PMIC. When I press the ON/OFF button, I am expecting PMIC_REQ_ON pin to go low so it will turn ON the PMIC. I don't see the PMIC_REQ_ON pin on IMX6 go low after a button press. What are the requirements for the ON/OFF pin and PMIC_REQ_ON to work on initial power up.
Thanks in advance.
The TEST_MODE pin defines usage of ONOFF signal. In normal usage the test mode pin is always
supposed to be low. When the TEST_MODE pin is high, it enables an alternate function of ONOFF,
which is RESET_IN_B. The datasheet specifies that TEST_MODE should be tied to ground or floated
(because it has an internal pull-down). With TEST_MODE always low, the ONOFF button/signal does
not pass through as a reset to the SRC.
Next, ONOFF signal has internal (100 KOhm ) pull-up, so can be left floating.
But under noisy environment – if internal 100 KOHm pull up is not strong enough – an external
resistor (of 10 KOhm) may be applied.