Original question:
Hi
Query-1:
We plan to use MPN # TPS65023QRHARQ1 to connect with i.mx6ULL nxp's processor. We have gone through the pin assignment and have a query with pin#27 "RESPWRON".
Can we connect this pin to the i.mx6ULL POR pin(P8)? As per the i.mx it's Power on reset functionality in the SNVS domain and has an internal Pull-up.
Query-2:
i.mx pin(T9) "PMIC_ON_REQ" is connected to which pin of PMIC?
Appreciate in advance.
Hi Viral,
Thank You for using E2E! Below are the responses to your questions. Please let us know if you need anything else.
Can we connect this pin to the i.mx6ULL POR pin(P8)?
The i.MX 6ULL datasheet requires the POR_B signal to be immediately asserted at power-up and to remain asserted until after the last power rail reaches its working voltage. The RESPWRON signal on the TPS65023 is generated according to the power-good comparator of the VRTC rail so it is help low when power is initially applied to the PMIC but it gets released when the VRTC LDO reaches its power-good threshold (the timing to release the RESPWRON signal is also defined by the external capacitor at the TRESPWRON pin). Since VRTC LDO is the first rail going high in the power-up sequence, the RESPWRON is not ideal to drive the POR_B on the processor. Instead we recommend using the PWRFAIL output to drive the SRC_POR_B signal on the i.MX6ULL. This would require the PWRFAIL_SNS signal (input for the comparator driving the PWRFAIL) to be included in the external ON/OFF sequence circuit as described in the Apps note at the following link: Power Supply Design for NXP i.MX 6 Using the TPS65023.
i.mx pin(T9) "PMIC_ON_REQ" is connected to which pin of PMIC?
The "PMIC_ON_REQ" signal could be used to drive the start of the external ON/OFF sequence circuit. For example, it can be used to drive the S1 switch in the circuit shown below. This capture was taken from the same Apps note that was referenced in the first question.
Thanks,
Brenda
Thank you Alex,
For more information, I am able to talk with the PMIC using the Linux i2c tool.
But With the TPS65023 driver, the PMIC is not responding.
TPS65023 Driver : https://elixir.bootlin.com/linux/v4.7.3/source/drivers/regulator/tps65023-regulator.c
DTS file:
&i2c4 {
clock-frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c4>;
status = "okay";
pmic: tps65023@48 {
compatible = "ti,tps65023";
reg = <0x48>;
regulators {
sw1a_reg: VDCDC1 {
regulator-name = "vdd_mpu";
regulator-always-on;
regulator-min-microvolt = <1350000>;
regulator-max-microvolt = <1500000>;
};
VDCDC2 {
regulator-name = "vdd_core";
regulator-always-on;
regulator-min-microvolt = <2900000>;
regulator-max-microvolt = <3300000>;
};
VDCDC3 {
regulator-name = "vdd_io";
regulator-always-on;
regulator-min-microvolt = <1350000>;
regulator-max-microvolt = <1450000>;
};
LDO1 {
regulator-name = "vdd_usb18";
regulator-always-on;
regulator-min-microvolt = <1750000>;
regulator-max-microvolt = <1820000>;
};
LDO2 {
regulator-name = "vdd_usb33";
regulator-always-on;
regulator-min-microvolt = <3200000>;
regulator-max-microvolt = <3300000>;
};
};
};