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Categories USB 2.0 XPRS Power Supplies Enclosures Cables Software Main Menu About Us Knowledge-Base FAQS Blog Installation Software Technical-Support News Mail-List Store-Policies License-Agreement Terms-Of -Use Privacy-Statement Online Store Menu Store Home Shopping Cart Checkout Advanced Search Shopping Cart There are no items in your shopping cart. | # PCI card - finding the voltages used ## 1. Introduction The design of the PCI bus places a number of voltages in the bus connector. A PCI card may use one, multiple or all of the voltages provided . As a minimum all of the PCI cards use +3.3V and/or +5V power. Depending on the functions of the card and the way they are realized, the PCI card may use other voltages as well. This article will give you a practical way of recognizing what voltages a PCI card is using and what is necessary to make the PCI card function on one of the SSI2, or XPRS families of cards. ## 2. Voltages on the PCI bus There are the four voltages provided for use on the PCI bus: +3.3V , +5V , +12V , -12V. The maximum currents defined in the speck are: +3.3V/7.6A , +5V/5A , +12V/500mA , -12V/100mA. Full details on the PCI bus are available on - Wikipedia, and TechFest. The PCI bus defines 'component' side of the PCI card as - side B (the above image), and 'solder' side - as side A (image below). The specification defines 'keying' - openings on the bus side of the pc board. Based on the location of the openings, there are 3 types of boards: '5V card', '3.3V card', and 'universal (3.3V and 5v) card'. The 2 images show 3 PCI cards, each one is 32bit, and one of them is '5V card', and the other 2 are - 'universal (3.3V and 5V) cards'. Regardless of the 'keying' of a card, it may use both 3.3V and 5V voltages, even when defined as a 3.3V or 5V type of a card. The power supplying pins for the optional +12V and -12V voltages are located on: side B - starting from the left to right: pin1 = -12V, pin2 = ........, pin3 = ... side A - starting from the right to left: pin1 = ......., pin2 = +12V, pin3 = ... There are the following scenarios for powering - - use 'pwr-5v' - PCI card-s using only 3.3/5v - or, use 'pwr-5v' and 'isa-pwr' - PCI card-s using 3.3/5v, and +12v,-12v low current - or, use 'isa-pwr-xr' - PCI card-s using 3.3/5v, and +12v,-12v high current ## 3. Examples ### 3.1. PCI card - need of +12V and -12V The PCI card in the picture below needs both optional voltages. Going through the pins reveals that - sideB/pin1=-12V (left image), and sideA/pin2=+12V (right image) are both connected/used. There are thick lines going up to the components on the circuit board . Based on the currents consumed by the PCI card on +12V, -12V, you can order and use: - pwr-5v (5V power supply) and isa-pwr (power supply module) if the consumed currents are less than 50ma - or, isa-pwr-xr (external power supply 25W) if the consumed currents are higher, or if unsure on the consumed currents ### 3.2. PCI cards - no need of additional voltages The PCI cards in the pictures below do not need the optional voltages. The PCI card above is 'keyed' as a '5V card', as seen at the above images. The PCI card below is 'keyed' as a 'universal (3.3V and 5V) card', as seen at the images below. The 2 PCI cards above have all the pads, as seen at the 2 above images. The PCI cards below do not have all the pads, as seen at the image below. Going through the pins reveals that - sideB/pin1=-12V (left image), and sideA/pin2=+12V (right image) are both missing. There are no thick lines going up to the components on the circuit board . This PCI card uses only 3.3V & +5V, does need an additional 5V power supply - pwr-5v . ### 3.3. PCI - need of +12V The PCI card in the pictures below need only one of the optional voltages. Going through the pins reveals that sideB/pin1=-12V (left image) is not connected/used. However sideA/pin2=+12V (right image) is connected/used - there is a thick line going up to the components on the circuit board . Based on the currents consumed by the PCI card on +12V, -12V you can order and use: - pwr-5v (5V power supply) and isa-pwr (power supply module) if the consumed currents are less than 50ma - or, isa-pwr-xr (external power supply 25W) if the consumed currents are higher, or if unsure on the consumed currents | Quick Store Search Search Term Advanced Search Currencies Select Currency Account Menu Account Login Create New Account Delivery Address Book Email Subscriptions Send Contact Message Recently Visited Pages PCI card - voltages used Use PCI card on a notebook Use PCI card on a notebook Speed testing -x16 vs. -x1 with PCI Express video cards Speed testing -x16 vs. -x1 with PCI Express video cards Popular Pages ARS Technologies Inc. Shopping Cart Send Contact Message USB 2.0 XPRS

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