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LM93 Datasheet(PDF) 11 Page - Texas Instruments |
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LM93 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 95 page  LM93 www.ti.com SNAS210E – DECEMBER 2003 – REVISED MARCH 2013 The −12V monitoring is particularly challenging. It is required that an external offset voltage and external resistors be used to bring the −12V rail into the positive input voltage region of the A/D input. It is suggested that the supply rail for the LM93 device be used as the offset voltage. This voltage is usually derived from the P/S 5V stand-by voltage rail via a ±1% accurate linear regulator. In this fashion we can always assume that the offset voltage is present when the −12V rail is present as the system cannot be turned on without the 3.3V stand-by voltage being present. Table 3-1. Voltage vs Register Reading Register Register Register Reading Absolute Normal Nominal Maximum Reading at Minimum Reading at Pin at Maxmum Use Voltage(1) Voltage Maximum Voltage Minimum Nominal Range Voltage Voltage Voltage AD_IN1 +12V1 0.927V C0h 1.236V FFh 0V 00h −0.3V to (VDD + 0.05V) AD_IN2 +12V2 0.927V C0h 1.236V FFh 0V 00h −0.3V to (VDD + 0.05V) AD_IN3 +12V3 0.927V C0h 1.236V FFh 0V 00h −0.3V to (VDD + 0.05V) AD_IN4 FSB_Vtt 1.20V C0h 1.60V FFh 0V 00h −0.3V to +6.0V AD_IN5 3GIO 1.5V C0h 2V FFh 0V 00h −0.3V to +6.0V AD_IN6 ICH_Core 1.5V C0h 2V FFh 0V 00h −0.3V to +6.0V AD_IN7 Vccp1 1.20V C0h 1.60V FFh 0V 00h −0.3V to +6.0V AD_IN8 Vccp2 1.20V C0h 1.60V FFh 0V 00h −0.3V to +6.0V AD_IN9 +3.3V 3.30V C0h 4.40V FFh 0V 00h −0.3V to +6.0V AD_IN10 +5V 5.0V C0h 6.667V FAh 0V 00h −0.3V to +6.5V AD_IN11 SCSI_Core 2.5V C0h 3.333V FFh 0V 00h −0.3V to +6.0V AD_IN12 Mem_Core 1.969V C0h 2.625V FFh 0V 00h −0.3V to +6.0V AD_IN13 Mem_Vtt 0.984V C0h 1.312V FFh 0V 00h −0.3V to +6.0V AD_IN14 Gbit_Core 0.984V C0h 1.312V FFh 0V 00h −0.3V to +6.0V AD_IN15 −12V 0.309V 40h 1.236V FFh 0V 00h −0.3V to (VDD + 0.05V) AD_IN16 +3.3V S/B 3.3V C0h 3.6V D1h 3.0V AEh −0.3V to +6.0V (1) Application Note: The nominal voltages listed in this table are only typical values. Voltage rails with different nominal voltages can be monitored, but the register reading at the nominal value is no longer C0h. For example, a Mem_Core rail at 2.5V nominal could be monitored with AD_IN12, or a Mem_Vtt rail at 1.2V could be monitored with AD_IN13. Copyright © 2003–2013, Texas Instruments Incorporated Functional Description 11 Submit Documentation Feedback Product Folder Links: LM93 |
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