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DM8127 Power Consumption Resources
DM8127 Power Consumption Resources
Introduction
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The DM8127 is similar to the DM814x family with specific peripherals not used, such as SATA, Camera1A and Camera1B ports. This device has both an ARM8 and DSP core. Power Estimation includes the Fixed supplies, and Core/Processor/(Accelerator if separate) supplies. This discussion tries to illustrate the DM8127 Power Estimation for the DM8127 EVM.
Fixed Supplies
| Supply name | IO for supply | voltage |
|---|---|---|
| DVVD | IO Standard pins | 3.3v, 1.8v |
| DVVD_GPMC,GPMCB | GPMC(B) pins | 3.3v, 1.8v |
| DVVD_RGMII | RGMII pins | 3.3v, 1.8v |
| DVVD_SD | SD pins | 3.3v, 1.8v |
| DVVD_C | C pins | 3.3v, 1.8v |
| DVVD_M | M pins | 1.8v |
| DVVD_DDR | DDR 2 sets | DDR2-1.8v, DDR3-1.5v, DDR3L-1.35v |
| VDDA_USB | 2 USB | 1.8v (note special 5v detect is not included) |
| VDDA_PCie | PCIe | 1.8v |
| VDDA_CSI2 | CSI2 | 1.8v |
| VDDA_HDMI | HDMI | 1.8v |
| VDDA_1p8 | 7 PLL | 1.8v, ferrite filters |
| VDDA_VDAC | analog V-DAC | 1.8v |
| VREFSSTL | 2 sets-DDR IO Reference | .5*DVVD_DDR |
Variable power supplies based on OPP mode, see DM8127 datasheet tables 8-4 and 8-5 for values.
| Power Supply | Type | OPP_100 | OPP_120 | OPP_160 |
|---|---|---|---|---|
| CVVD | Logic core (no AVS or dynamic scaling) | 1.1 | 1.2 | 1.35 |
| CVVD_ARM | ARM core (no AVS or dynamic scaling) | 1.1 | 1.2 | 1.35 |
| CVVD_DSP | DSP core (no AVS or dynamic scaling) | 1.1 | 1.2 | 1.35 |
| CVVD_HDVICP | HDVICP core | 1.1 | 1.2 | 1.35 |
The operating mode of the DM8127, determines both the speed of the processors and accelerators, and the voltage. Example power dissipation by mode is:
| Operating condition | SOC Power Estimate (w) |
|---|---|
| OPP100 | 2.2w |
| OPP120 | 3w |
| OPP_160 | 3.6w |
Given the DM8127 is a subset of the DM814x, given that CAM1A, CAM1B, and SATA interfaces are disabled, you can follow the DM814x/AM387x example for power estimation[1] .
Example Power Estimation for OPP100 - note you can change parameters, (upper right) OPP mode, and main spreadsheet for customization, is avaiable here. File:DM814x AM387x PowerSpreadSheet RevE0.zip
Customization can further lower the estimate. You need to enter the thermal parameter in the upper right. But a thermal calculation, including the heatsink, conduction to case, airflow is not included in this spreadsheet.
References
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DM8127 Datasheet - [2]
DM814x Overview - [3]
DM8127 Hardware Design Guide - [4]
DM814x AM387x Power Estimation - [5]
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