i.MX 95 with PF0900 + third-party VDD_SOC/VDD_ARM regulators We're designing an i.MX 95 (MIMX9596CVTXNAC, 15×15 mm, LPDDR4X) board with MPF0900AMBA2ES. The MPF5302BMMAAES / MPF5301BMMABES have no distributor stock anywhere we can find, so as a fallback we plan to use TI TPS62873Z1 bucks for VDD_SOC and VDD_ARM. We'd appreciate a review the points below, or anything we've missed. If there are other parts NXP recommends instead, please let me know! Enable/sequencing: PF0900 GPIO3 enables the VDD_SOC buck, GPIO4 the VDD_ARM buck (A2 OTP, slots 1 and 5, low in standby), as on the EVK. The PF0900 power-cycles them on WDOG_ANY, meeting the IMX95IEC note on non-NXP PMICs. Start-up voltage: VDD_SOC starts at 0.900 V and VDD_ARM at 0.875 V (the PF5302/PF5301 OTP boot at 0.920 V). Both are inside the PF0900 VMON1/2 window (0.900 V, −5 %/+5 %). Is 0.875–0.900 V acceptable for ROM boot, or does boot rely on 0.92 V? Suspend: as on the EVK, the VDD_SOC buck turns off and PF0900 LDO3 holds VDD_SOC at 0.65 V. The TI buck's output discharge is disabled at boot so it doesn't load LDO3 (matching the PF5302 OTP "PD resistor not discharged"). VDD_ARM is off and discharged. System Manager: we'll replace the PF53 calls in brd_sm_voltage.c with a TPS6287x driver, and disable VMON1/2 at boot as the EVK port does. Anything else in the SM that depends on the PF53, e.g. fault handling or the PF53 info/sensor paths? Are there any VDD_SOC/VDD_ARM requirements beyond IMX95IEC Tables 30 and 32: load-step slew, ripple, or the AVP the PF53 uses? Thank you! PMIC Re: i.MX 95 with PF0900 + third-party VDD_SOC/VDD_ARM regulators Hello,
Unfortunately, we do not have replacements for these regulators.
1. Following enable/sequencing is needed to warranty power transitions in the processor, please follow them according to the design guidelines.
2. It is acceptable while you are into the specification range.
3. This is ok.
4. Keep in mind that there are several initializations, power transitions, interrupts, etc. in system manager. Porting from PF53 regulators to third party regulators that needs to be considered. Unfortunately, we do not have a porting guide for this specific part number.
5. You can use PF53 datasheet in section "Typical performance curves" as reference to get these values.
Best regards.
記事全体を表示