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LM78 Datasheet(PDF) 29 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM78
Description  Microprocessor System Hardware Monitor
PDF  31 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM78 Datasheet(HTML) 29 Page - National Semiconductor (TI)

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Functional Description (Continued)
Address A6–A0
Address A6–A0 with
Auto-Increment
Description
Note: This location stores the number of counts of the internal clock per
revolution.
29h
69h
FAN2 reading
Note: This location stores the number of counts of the internal clock per
revolution.
2Ah
6Ah
FAN3 reading
Note: This location stores the number of counts of the internal clock per
revolution.
2Bh
6Bh
IN0 High Limit
2Ch
6Ch
IN0 Low Limit
2Dh
6Dh
IN1 High Limit
2Eh
6Eh
IN1 Low Limit
2Fh
6Fh
IN2 High Limit
30h
70h
IN2 Low Limit
31h
71h
IN3 High Limit
32h
72h
IN3 Low Limit
33h
73h
IN4 High Limit
34h
74h
IN4 Low Limit
35h
75h
-IN5 High Limit
36h
76h
-IN5 Low Limit
37h
77h
-IN6 High Limit
38h
78h
-IN6 Low Limit
39h
79h
Over Temperature Limit (High)
3Ah
7Ah
Temperature Hysteresis Limit (Low)
3Bh
7Bh
FAN1 Fan Count Limit
Note: It is the number of counts of the internal clock for the Low Limit of
the fan speed.
3Ch
7Ch
FAN2 Fan Count Limit
Note: It is the number of counts of the internal clock for the Low Limit of
the fan speed.
3Dh
7Dh
FAN3 Fan Count Limit
Note: It is the number of counts of the internal clock for the Low Limit of
the fan speed.
3E–3Fh
7E–7Fh
Reserved
Note: Setting all ones to the high limits for voltages and fans (0111 1111 binary for temperature) means interrupts will never be generated except the case when
voltages go below the low limits.
For voltage input high limits, the device is doing > comparison. For low limits, however, it is doing
≤ comparison.
www.national.com
29



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