Rainbow Electronics LM87 - Manual (Page 30)

Functional Description
(Continued)
Address A6–A0 Description
2Ah Reserved
2Bh +2.5V High Limit/External Temperature 2 High Limit
2Ch +2.5V Low Limit/External Temperature 2 Low Limit
2Dh Vccp1 High Limit
2Eh Vccp1 Low Limit
2Fh +3.3V High Limit
30h +3.3V Low Limit
31h +5V High Limit
32h +5V Low Limit
33h +12V High Limit
34h +12V Low Limit
35h Vccp2 High Limit
36h Vccp2 Low Limit
37h External Temperature 1 High Limit
38h External Temperature 1 Low Limit
39h Internal Temperature High Limit
3Ah Internal Temperature Low Limit
3Bh FAN1Count Limit/AIN1 High Limit
Note: It is the number of counts of the internal clock for the Low Limit of the fan speed.
3Ch FAN2 Fan Count Limit/AIN2 High Limit
Note: It is the number of counts of the internal clock for the Low Limit of the fan speed.
3Dh Reserved
3Eh Company Identification. The number in this register identifies National Semiconductor LM87 (0000
0010)
3Fh Stepping Register LM87 revision number 06h(0000 0110)
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 a greater than com-
parison. For low limits, however, it is doing a less than or equal to
comparison.
LM87
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