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LM93 Datasheet(PDF) 34 Page - National Semiconductor (TI) |
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LM93 Datasheet(HTML) 34 Page - National Semiconductor (TI) |
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34 / 92 page  16.0 Registers 16.1 REGISTER WARNINGS In most cases, reserved registers and register bits return zero when read. This should not be relied upon, since reserved registers can be used for future expansion of the LM93 functions. Some registers have “N/D” for their default value. This means that the power-up default of the register is not defined. In the case of value registers, care should be taken to ensure that software does not read a value register until the associated measurement function has acquired a measurement. This applies to temperatures, voltages, fan RPM, and PROCHOT monitoring. In the case of other registers, such as fan control settings, N/D means that software must initialize these registers to ensure they have a known value before setting the START bit in the LM93 Configuration register. 16.2 REGISTER SUMMARY TABLE Register Key Term Description N/D Not Defined N/A Not Applicable R Read Only R/W Read or Write RWC Read or Write to Clear Lock Register Name Address Default Description FACTORY REGISTERS x XOR Test 00h 00h Used to set the XOR test tree mode SMBus Test 01h N/D SMBus read/write test register Reserved 02h-3Dh N/D Manufacturer ID 3Eh 01h Contains manufacturer ID code Version/Stepping 3Fh 73h Contains code for major and minor revisions BMC ERROR STATUS REGISTERS B_Error Status 1 40h 00h BMC error status register 1 B_Error Status 2 41h 00h BMC error register 2 B_Error Status 3 42h 00h BMC error register 3 B_Error Status 4 43h 00h BMC error register 4 B_P1_PROCHOT Error Status 44h 00h BMC error register for P1_PROCHOT B_P2_PROCHOT Error Status 45h 00h BMC error register for P2_PROCHOT B_GPI Error Status 46h 00h BMC error register for GPIs B_Fan Error Status 47h 00h BMC error register for Fans HOST ERROR STATUS REGISTERS H_Error Status 1 48h 00h HOST error status register 1 H_Error Status 2 49h 00h HOST error register 2 H_Error Status 3 4Ah 00h HOST error register 3 H_Error Status 4 4Bh 00h HOST error register 4 H_P1_PROCHOT Error Status 4Ch 00h HOST error register for P1_PROCHOT H_P2_PROCHOT Error Status 4Dh 00h HOST error register for P2_PROCHOT H_GPI Error Status 4Eh 00h HOST error register for GPIs H_Fan Error Status 4Fh 00h HOST error register for Fans VALUE REGISTERS Zone 1 (CPU1) Temp 50h N/D Measured value of remote thermal diode temperature channel 1 Zone 2 (CPU2) Temp 51h N/D Measured value of remote thermal diode temperature channel 2 Zone 3 (Internal) Temp 52h N/D Measured temperature from on-chip sensor Zone 4 (External Digital) Temp 53h N/D Measured temperature from external temperature sensor Zone 1 (CPU1) Filtered Temp 54h 00h Filtered value of remote thermal diode temperature channel 1 www.national.com 34 |
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