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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LM87 Datenblatt(PDF) 29 Page - National Semiconductor (TI) |
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LM87 Datenblatt(HTML) 29 Page - National Semiconductor (TI) |
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29 / 32 page  Functional Description (Continued) Bit Name Read Only Description 6 FAN1/AIN1 Read Only A one indicates the fan count limit has been exceeded or an AIN1 High or Low limit has been exceeded. 7 FAN2/AIN2 Read Only A one indicates the fan count limit has been exceeded or an AIN2 High or Low limit has been exceeded. 13.16 Interrupt Status Register 2 Mirror — Address 4Dh Power on default – <7:0> = 0000 0000 binary Bit Name Read Only Description 0 +12Vin Read Only A one indicates a High or Low limit has been exceeded. 1 Vccp2 Read Only A one indicates a High or Low limit has been exceeded. 2 Reserved Read Only 3 Reserved Read Only 4 CI Read Only A one indicates the CI (Chassis Intrusion) input has gone high. 5 THERM# Read Only A one indicates the THERM# input has been pulled low by external circuitry. 6 D1 Fault Read Only A one indicates the D1 inputs are shorted to Vcc or open circuit. 7 D2 Fault Read Only A one indicates the D2 inputs are shorted to Vcc or open circuit. 13.17 SMBALERT# Enable — Address 80h Power on default – <7:0> = 0010 0000 binary Bit Name Read/Write Description 0 Reserved Read Only 1 Reserved Read Only 2 Reserved Read Only 3 Reserved Read Only 4 Reserved Read Only 5 Reserved Read Only 6 SMBALERT# Enable Read/Write A one enables the SMBALERT# mode of operation. 7 Reserved Read Only 13.18 Value RAM — Address 19h–3Fh Address A6–A0 Description 19h DAC data register; power on default <7:0> =1111 1111 binary 1Ah AIN1 Low Limit 1Bh AIN2 Low Limit 20h +2.5V/External Temperature 2 reading 21h Vccp1 reading 22h +Vcc reading 23h +5V reading 24h +12V reading 25h Vccp2 reading 26h External Temperature 1 reading 27h Internal Temperature reading 28h FAN1/AIN1 reading Note: For the FAN reading, this location stores the number of counts of the internal clock per revolution. 29h FAN2/AIN2 reading Note: For the FAN reading, this location stores the number of counts of the internal clock per revolution. www.national.com 29 |
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