AM62x is an extension of the Sitara™ Industrial grade family of heterogeneous Arm® processors with embedded 3D graphics acceleration, dual display interfaces and extensive peripheral and networking options. The low-cost AM62x Sitara processors help customers reduce system design complexity and cost. AM62x is suitable for a broad set of industrial applications that include Industrial HMI (Human Machine Interface), EV charging stations, Touchless building access and Driver monitoring systems.
This document describes the power tree for the AM62x processor using low cost discrete voltage regulators and details the specific power up/down sequencing requirement of the different voltage rails of the AM62x
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AM62x requires four to eight power supply groups, depending on the system requirements. The power supply groups include the core supply (VDD_CORE), RAM supply (VDDR_CORE), DDR PHY IO supply (VDDS_DDR), 3.3 V digital supply (VDDSHVx), SD Card interface supply (VDDSHV5), 1.8 V digital supply (VDDSHVy), 1.8 V analog supply (VDDA_1P8) and a 1.8 V eFuse programming supply (VPP).
Figure 1-1 shows a block diagram of the power tree of the AM62x with DDR4. The different voltage regulators for these rails were chosen based on cost, good efficiency, load transient performance, and power up/down sequencing requirements.
The LM61460-Q1, buck converter is used to supply the 3.3V, VDDSHVx rail as well as act as the input supply for the rest of the voltage regulators, except the TLV7103318 in the power tree. VDDSHVy, VDDS_DDR, VDD_CORE and VDDR_CORE are supplied by the TPS6282x family of buck converters. These are high efficiency small solution size buck converters having controlled turn on and turn off times. The VDDA_1P8 and VPP are supplied by 2 LDOs - TPS74518 and TLV75518 respectively. The VDDSHV5 (SD Card IO power supply) rail can be configured to run either at 3.3 V or 1.8 V and is powered using a TLV7103318 LDO. A couple of logic gates along with an RC delay is also required for proper sequencing of the VDD_CORE and VDDR_CORE rails. A detailed circuit schematic detailing the power solution and sequencing is shown in Figure 1-1.
The AM62x power requirements are listed in Table 1-1.
| Power Supply | VOUT (V) | IOUT (mA) | Output Voltage (V) | Power Supply | Nominal Rating | Grouping |
|---|---|---|---|---|---|---|
| LM61460-Q1 | Adjustable | 6000 | 3.3 | VDDSHV_MCU, VDDSHV0, VDDSHV2, VDDSHV3, VDDSHV_CANUART, VDDA_3P3_USB, VMON_3P3_SOC | 3.3 V ±5% | VDDSHVx |
| TLV7103318 | 3.3, 1.8 | 200 | 3.3 / 1.8 | VDDSHV5 | 3.3 V ±5% 1.8 V ±5% |
VDDSHV5 |
| TPS74518 | 1.8 | 500 | 1.8 | VDDA_MCU, VDDA_PLL0, VDDA_PLL1, VDDA_PLL2, VDDA_1P8_CSIRX0, VDDA_1P8_OLDI0, VDDA_1P8_USB, VMON_1P8_SOC, VDDA_TEMP0, VDDA_TEMP1 | 1.8 V ±5% | VDDA_1P8 |
| TPS6282518 | 1.8 | 2000 | 1.8 | VDDSHV1, VDDSHV4, VDDSHV6, VMON_1P8_SOC, | 1.8 V ±5% | VDDSHVy |
| TPS62824 | Adjustable | 2000 | 1.2 | VDDS_DDR, VDDS_DDR_C | 1.2 V ±5% | VDDS_DDR |
| TPS62826 | Adjustable | 3000 | 0.75 | VDD_CORE, VDD_CANUART, VDDA_CORE_CSIRX0, VDDA_CORE_USB, VDDA_DDR_PLL0 | 0.75 V ±5% | VDD_CORE |
| TPS62824 | Adjustable | 2000 | 0.85 | VDDR_CORE | 0.85 V ±5% | VDDR_CORE |
| TLV75518 | 1.8 | 500 | 1.8 | VPP | 1.8 V ±5% | VPP |