Functional Description (Continued)
12.10 Value RAM — Address 20h–3Fh
Address A7–A0
Description
20h
21h
22h
23h
24h
25h
26h
27h
28h
IN0 reading
IN1 reading
IN2 reading
IN3 reading
IN4 reading
IN5 reading
IN6 reading
Temperature reading
FAN1 reading
Note: This location stores the number of counts of the internal clock per revolution.
29h
FAN2 reading
Note: This location stores the number of counts of the internal clock per revolution.
2Ah
2Bh
2Ch
2Dh
2Eh
2Fh
30h
31h
32h
33h
34h
35h
36h
37h
38h
39h
3Ah
3Bh
3Ch
IN0 High Limit
IN0 Low Limit
IN1 High Limit
IN1 Low Limit
IN2 High Limit
IN2 Low Limit
IN3 High Limit
IN3 Low Limit
IN4 High Limit
IN4 Low Limit
IN5 High Limit
IN5 Low Limit
IN6 High Limit
IN6 Low Limit
Hot Temperature Limit (High)
Hot Temperature Hysteresis Limit (Low)
OS Temperature Limit (High)
OS Temperature Hysteresis Limit (Low)
FAN1 Fan Count Limit
Note: It is the number of counts of the internal clock for the Low Limit of the fan speed.
FAN2 Fan Count Limit
3Dh
Note: It is the number of counts of the internal clock for the Low Limit of the fan speed.
Reserved
3Eh-3Fh
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 volt-
ages go below the low limits.
For voltage input high limits, the device is doing a greater than comparison. For low limits, however, it is doing a less than or equal to comparison.
27
www.national.com
NSC [ National Semiconductor ]
