Power Distribution#

Power Distribution Dependency#

The following diagram shows in which flow the rails (equals with signal names in the schematic) of the carrier board are powered.

graph LR A(X14) -->|Reverse Polarity, Overvoltage Protection| VIN{VIN} VIN --> X15 VIN -->|U10, 3.3 V, 5.0 A max| 3V3_MOD VIN -->|U11, 3.3 V, 5.0 A max| 3V3_PER VIN -->|U12, 5.0 V, 5.0 A max| 5V_PER VIN -->|U23, 1.8 V, 2.5 A max| 1V8_PER 5V_PER -->|U22, 1.8 V, 2.0 A max| 1V8_MOD 1V8_MOD -->|Jumper R128| VCCO_47 1V8_MOD -->|Jumper R129| VCCO_48 1V8_MOD -->|Jumper R133| VCCO_64 1V8_MOD -->|Jumper R131| VCCO_65 1V8_MOD -->|Jumper R136| VCCO_66 VCCO_47 -.-> SoM((SoM)) VCCO_48 -.-> SoM VCCO_64 -.-> SoM VCCO_65 -.-> SoM VCCO_66 -.-> SoM 3V3_MOD -.-> SoM

Power-On Sequence#

There is a recommended sequence of powering up the Xilinx Zynq UltraScale+ MPSoC power domains. The SoM cares about the power-on sequence of their components such as Low-Power Domain, Full-Power Domain and memory. For more information see TE0808 Rechnical Reference Manual. The carrier board differs between power-on the Processing System (PS) and Programical Logig (PL) part of the SoM. The PS has to be powered-up before PL. Sequence Stage 1 starts with applying the 24 V power supply at X14 to rail VIN. Thus it powers up the SoM after 3V3_MOD is available (Stage 2). The SoM feedbacks with a “power good” signal PG_Module to enable the power supply for the PL (through 1V8_MOD).

sequenceDiagram participant VIN participant 3V3_MOD participant 3V3_PER participant 5V_PER participant 1V8_MOD participant 1V8_PER participant SoM VIN->>+3V3_MOD: Stage 1 VIN->>+3V3_PER: Stage 1 VIN->>+5V_PER: Stage 1 3V3_MOD->>+SoM: Stage 2 SoM->>+1V8_MOD: PG_Module SoM->>+1V8_PER: PG_Module 1V8_MOD->>+SoM: Stage 3