Ampro Corporation COM 830 manual Power Supply Implementation Guidelines, Additional Features

Chapter 2 Specifications

Power Supply Implementation Guidelines

12 volt input power is the sole operational power source for the COM 830. The remaining necessary voltages are internally generated on the module using onboard voltage regulators. A baseboard designer should be aware of the following important information when designing a power supply for a COM 830 application:

It has also been noticed that on some occasions problems occur when using a 12V power supply that produces non monotonic voltage when powered up. The problem is that some internal circuits on the module (e.g. clock-generator chips) will generate their own reset signals when the supply voltage exceeds a certain voltage threshold. A voltage dip after passing this threshold may lead to these circuits becoming confused resulting in a malfunction. It must be mentioned that this problem is quite rare but has been observed in some mobile power supply applications. The best way to ensure that this problem is not encountered is to observe the power supply rise waveform through the use of an oscilloscope to determine if the rise is indeed monotonic and does not have any dips. This should be done during the power supply qualification phase therefore ensuring that the above mentioned problem doesn't arise in the application. For more information about this issue visit www.formfactors.org and view page 25 figure 7 of the document “ATX12V Power Supply Design Guide V2.2”.

Power Management

APM 1.2 compliant. ACPI 2.0 compliant with battery support. Also supports Suspend to RAM (S3).

Secondary Connector Rows C and D

The following subsystems can be found on the secondary connector rows C and D.

PCI Express Graphics (PEG)

The COM 830 supports the implementation of a x16 link for an external high-performance PCI Express Graphics card. It supports a theoretical bandwidth of up to 4GB/s. Each lane of the PEG Port consists of a receive and transmit differential signal pair designated from PEG_RX0 (+ and -) to PEG_RX15 (+ and -) and correspondingly from PEG_TX0 (+ and -) to PEG_RX15 (+ and -). It's also possible to utilize a standardized Advanced Digital Display Card 2nd Generation (ADD2-based on SDVO) via the x16 PEG Port connector, which can support a wide variety of display options like DVI, LVDS, TV-Out and HDMI.

SDVO

The pins of PEG Port are shared with the Serial Digital Video Ouput (SDVO) functionality and may be alternatively used for two third party SDVO compliant devices connected to channels B and C.

PCI Bus

The implementation of the PCI bus complies with PCI specification Rev. 2.3 and provides a 32bit parallel PCI bus that is capable of operating at 33MHz.

IDE

The IDE host adapter is capable of UDMA-100 operation. Only the Primary IDE channel is supported.

Additional Features

Watchdog

The COM 830 is equipped with a multi stage watchdog solution that is triggered by software. The COM Express Specification does not provide support for external hardware triggering of the Watchdog, which means the COM 830 does not support external hardware triggering.

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