microATX Motherboard Interface Specification
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Version 1.2
microATX Motherboard Interface Specification Version 1.2
Page 2IMPORTANT INFORMATION AND DISCLAIMERS
1. INTEL CORPORATION MAKES NO WARRANTIES WITH REGARD TO THIS SPECIFICATION (“SPECIFICATION”), AND IN PARTICULAR DOES NOT WARRANT OR REPRESENT THAT THIS SPECIFICATION OR ANY PRODUCTS MADE IN CONFORMANCE WITH IT WILL WORK IN THE INTENDED MANNER. NOR DOES INTEL ASSUME RESPONSIBILITY FOR ANY ERRORS THAT THE SPECIFICATION MAY CONTAIN OR HAVE ANY LIABILITIES OR OBLIGATIONS FOR DAMAGES INCLUDING, BUT NOT LIMITED TO, SPECIAL, INCIDENTAL, INDIRECT, PUNITIVE, OR CONSEQUENTIAL DAMAGES WHETHER ARISING FROM OR IN CONNECTION WITH THE USE OF THIS SPECIFICATION IN ANY WAY.
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correctionCopyright 2003 - 2004 Intel Corporation
microATX Motherboard Interface Specification
Version 1.2
Revision History
Changes from Version 1.1 to Version 1.2
Global — Replaced ATX 2.01 with ATX 2.1, where appropriate and removed SFX in SFX/SFX12V Power Supply Design Guide.
Important Information and Disclaimers updated.
Section 2.3.7 and Section3.1 Main Power Connector changed from 20 pin to 24 pin (2 x 12) to support PCI-Express* requirements.
Changes from Version 1.0 to Version 1.1
Global—Removed references to AT, Baby AT, and Mini-ATX.
Section 1—Revid introductory paragraph, updated the specification Web site URL, and changed ATX 2.01 to ATX 2.1 in Table 1.
Section 1.1—Updated Web site URL and list of related documents.
Section 1.2—Revid Figure 1.
英语900句Section 2.3.4—Replaced Figure 4. Updated the text in the paragraph immediately preceding Figure 5:
corrected the dimensions of the hatched area in Figure 5. Replaced Figure 6.
Section 2.4—Moved text in Section 2.4 under a new subheading, 2.4.1. Added subheading, 2.4.2, to
specify condary side height constraints. Revid Figure 7 to reflect an increa in the maximum component height restriction. Zones C, D, and E formerly specified three different height restrictions. This revision replaces tho three zones (C, D, and E) with one maximum component height restriction zone (C) for the entire
region.
Section 3—Removed discrepancies between this document and the SFX12V Power Supply Design Guide.
Section 3.2—Added new ction titled “2x2 Connector” to describe a new +12V power connector.
Renumbered subquent ctions.
Global—Replaced ATX 2.01 with ATX 2.1, where appropriate. Replaced SFX with SFX12V (SMALL
FORM FACTOR), where appropriate.
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microATX Motherboard Interface Specification
Version 1.2
Contents
1.Executive Summary (6)
1.1Other Technical Documents (6)
1.2microATX Form-factor Overview (7)
1.3Benefits to Urs (8)
1.4Benefits to Manufacturers (8)storia
1.5Mounting microATX Motherboard in an ATX Chassis (8)
2.Layout (9)
2.1Board Dimensions (9)
2.2Mounting Hole Placement (9)
2.3Connector Placement (11)
2.3.1Expansion Slots (11)
2.3.2Disk I/O 13
2.3.3Front Panel I/O (13)
2.3.4Back Panel I/O (13)
2.3.5Memory Sockets (16)
2.3.6Processor (16)
2.3.7Power Supply Connector (16)
2.4Height Constraints (17)
2.4.1Primary (Component) Side Height Constraints (17)
2.4.2Secondary (Bottom/Solder) Side Height Constraints (17)
3.Power Supply Connector Information (19)
3.1Main Power Connector (19)
3.2Signal Control Definitions (20)
3.2.1PS-ON 20
3.2.25VSB 20
3.2.3Power Good Signal, PW-OK (20)
3.3Voltage Tolerances (21)
3.4Optional 6-pin Power Connector (21)strongbox
3.4.1FanM Signal (22)
3.4.2FanC Signal (22)
3.4.33.3V Sen Line (23)
3.4.41394V Pin (23)
3.4.51394R Pin (23)
Figures
1: Example of a microATX System (7)
2: microATX and ATX Form-factor Mounting Holes (10)
3: Example microATX Layout Diagram (12)
4: Chassis I/O Aperture Requirements (14)
5: Motherboard I/O Connector Location Recommendation (15)elena
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microATX Motherboard Interface Specification
Version 1.2
Page 5 6:
Example Rear Panel I/O 16 7:
microATX Motherboard Maximum Component 18 8:
20-pin Main Power Supply Connector Configuration (required for microATX).........................................................................................................19 9:
2x2 20 10:
6-pin Optional Power Supply 21 11:
Simple Implementation of a Fan Monitor Circuit (22)
Tables
1: microATX Feature Summary (6)
2: Requirements to Mount microATX Motherboard in ATX 2.1-compliant Chassis (8)
3: microATX and ATX Board Dimensions (9)
4: Motherboard Mounting Hole Locations (9)
5: Connector Locations (11)
6: Height Constraints (17)
7: Voltage Tolerances (21)
