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LM93 Datasheet(PDF) 33 Page - National Semiconductor (TI) |
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LM93 Datasheet(HTML) 33 Page - National Semiconductor (TI) |
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33 / 92 page  15.0 Using The LM93 (Continued) 15.11 XOR TREE TEST An XOR tree is provided in the LM93 for Automated Test Equipment (ATE) board level connectivity testing. This al- lows the functionality of all digital inputs to be tested in a simple manner and any pins that are non-functional or shorted together to be identified. When the test mode is enabled by setting the ‘XEN’ bit in the XOR Test register, the part enters XOR test mode. The following signals are included in the XOR test tree: Px_VIDy GPIO_x PWMx Px_PROCHOT VRDx_HOT SCSI_TERMx RESET Since the test mode is XOR tree, the order of the signals in the tree is not important. SMBDAT and SMBCLK should not be included in the test tree. Example of XOR Test Tree (not showing all signals) 20068219 To properly implement the XOR TREE test on the PCB, no pins listed in the tree should be connected directly to power or ground. If a pin needs to be configured as a permanent low, such as an address, it should be connected to ground through a low value resister such as 10 k Ω, to allow the ATE (Automatic Test Equipment) to drive it high. When generating test waveforms, a typical propagation de- lay of 500 ns through the XOR tree should be allowed for. www.national.com 33 |
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