Micro Technic PV-5127A ATX and Softoff state machines, Main DC/DC converter and 5V STB

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Users Manual & Installation Guide

PV- 5127: Power supply module with UPS

ATX and Softoff state machines

The PV-5127 provides several ways to turn on/off power. ATX compatible CPUs can turn themselves on and off using PS_ON, and UPS monitoring software on CPUs without PS_ON can turn off using either a RS232 handshake signal or a software command through the PC/104 bus. Regardless of the method, the system temperature ensures that the CPU can only be turned on when the system temperature is OK, but it is allowed to stay on if the temperature later becomes too cold or too hot. The system temperature circuit can be bypassed using a jumper that effectively tells the PV-5127 that the temperature is always OK.

The main DC/DC converter and 5V STB

The main DC/DC converter converts the input voltage (from mains or the backup battery) to 5V. The output of the converter is directly connected to the 5V STB output, so whenever the converter is on, the 5V STB is present. It also powers the internal control logic. When off, the power consumption is minimal.

The output of the converter is also connected, through a power switch, to the main 5V output and (through a step-up DC/DC converter) to the 12V output. The power switch controls when to turn on the 5V+12V outputs.

The main DC/DC converter turns on when mains appears, and stays on as long as mains is present. When the converter is on, the CPU can turn on and off the 5V+12V output using PS_ON, depending on temperatures etc.

When mains disappears, the converter stays on as long as the 5V+12V output is on, and the battery is OK (>9.5V). That is, when running on battery, the converter is turned off when the CPU turns itself off (to conserve battery capacity until mains comes back), or when the battery is empty (to protect the battery against deep discharging).

The 5V+12V outputs

The power switch, which turns on and off the 5V+12V outputs, is controlled by two state machines implemented in the control logic – the ATX on/off state machine, and the Softoff state machine. Both state machines must be in their “on” state for the power switch to turn on. When either state machine goes to an “off” state, the 5V+12V outputs turn off, and if mains is not present, the main DC/DC converter also turns off.

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Contents Micronix PC/104 Power Supply Table of contents PV- 5127 Power supply module with UPS Revision history Revision number Reason for change DateOrdering codes AccessoriesGeneral information Model no DescriptionBlock Diagram DescriptionPV- 5127 Power supply module with UPS Connectors RS232 connector CN3 Heater and fan control and external LEDs connector CN2Mode LED color Function LED name Pin no FunctionBatt. sensor connector J1 ATX connector CN10Ext. sensor connector J2 Pinheader ST3PC/104 bus connector CN1 Cool System temperatureToo cold WarmPV- 5127 Power supply module with UPS Pson signal UPS ControlPV-5127 CN3 RS232Pin Function Mains failure Battery low Status When the system is too hotSignature port 250h, read only PC/104 interfaceAddress Read/write Function Status port 251h, read only 0000bmssRS232STATUS port 253h, read only uuuu0000 Batstatus port 252h, read only nn0cctvvShutdown port 254h, read/write Softoff Software compatibilityST1 installed Battery monitor and chargerBattery voltages Lead-acid chargerInstalled on J1 Charger function Battery LED MeaningMain DC/DC converter and 5V STB ATX and Softoff state machines5V+12V outputs ATX on/off state machine Softoff state machineIt can be illustrated like this Input voltage Technical dataOutput power Output VoltageEnvironmental specifications Mechanical layout Precautions to ESD Installation guideSettings and connections Connection in KL2 Function Connection number in KL3 FunctionThermal considerations UinV TcapC Tamb max.C PoutWBlock diagram of the PV-5127A Differences between PV-5127 and PV-5127A

PV-5127A, PV-5127 specifications

The Micro Technic PV-5127 and PV-5127A models represent a significant achievement in the field of precision measurement instruments, specifically designed to enhance efficiency and accuracy in various industrial and scientific applications. These devices are characterized by their robust construction, user-friendly interface, and advanced technological features that cater to the needs of professionals.

One of the standout features of both the PV-5127 and PV-5127A is their high-resolution digital display, which provides clear readouts of measurements, ensuring that users can easily interpret data in real time. The devices boast a wide measurement range, allowing them to perform accurate readings across various parameters, including voltage, current, and resistance. This versatility makes them ideal for use in labs, research facilities, and fieldwork.

The PV-5127 and PV-5127A incorporate advanced microprocessor technology, ensuring precise measurements and quick response times. This technology enhances the instrument's ability to perform complex calculations, making it suitable for various applications, including electronics testing, industrial maintenance, and educational purposes.

Both models feature intuitive controls, enabling users to navigate functions effortlessly. The user interface is designed for simplicity, minimizing the learning curve for new users while empowering seasoned professionals to utilize the instruments to their full potential. Additionally, the PV-5127A includes enhanced features such as data logging and connectivity options, allowing users to transfer data to computers or other devices for further analysis.

Durability is another notable characteristic of these models. Constructed to withstand harsh working conditions, the PV-5127 and PV-5127A are built with high-quality materials that protect against impacts and environmental factors, ensuring longevity and reliability.

Power efficiency is also a critical aspect, as both models offer low power consumption without compromising performance. This feature is particularly important for users who rely on portable devices for extended periods.

In summary, the Micro Technic PV-5127 and PV-5127A models are sophisticated measurement instruments that combine advanced technology with user-friendly design. Their versatility, durability, and efficiency make them valuable tools for professionals across various fields, enhancing productivity and accuracy in measurement tasks. Whether in a laboratory setting or an industrial environment, these devices stand out as reliable companions for precise measurements.
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