Rainbow Electronics DS1780 - Manual (Page 21)

DS1780
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VALUE RAM (ADDRESS 0x15h - 0x3Dh) Table 10.15
ADDRESS h R/W DESCRIPTION
20h R +2.5V Input Reading.
21h R V
CCP1
Input Reading.
22h R +3.3V Input Reading.
23h R +5V Input Reading.
24h R +12V Input Reading.
25h R +2.5V_Sense/V
CCP2
Input Reading.
26h R Reserved.
27h R Temperature reading (Most significant 8-bits).
28h R
FAN1 reading: This location stores the number of counts of the
internal clock per revolution.
29h R
FAN2 reading: This location stores the number of counts of the
internal clock per revolution.
2Ah R/W Reserved.
2Bh R/W +2.5V High Limit (Note 1, 2).
2Ch R/W +2.5V Low Limit (Note 2).
2Dh R/W +V
CCP1
High Limit (Note 1, 2).
2Eh R/W +V
CCP1
Low Limit (Note 2).
2Fh R/W +3.3V High Limit (Note 1, 2).
30h R/W +3.3V Low Limit (Note 2).
31h R/W +5V High Limit (Note 1, 2).
32h R/W +5V Low Limit (Note 2).
33h R/W +12V High Limit (Note 1, 2).
34h R/W +12V Low Limit (Note 2).
35h R/W +2.5V_Sense/Vccp2 High Limit (Note 1, 2).
36h R/W +2.5V_Sense/Vccp2 Low Limit (Note 2).
37h Reserved.
38h Reserved.
39h R/W Hot Temperature (High) Limit (Note 1).
3Ah R/W Hot Temperature Hysteresis (Low) Limit.
3Bh R/W
FAN1 Fan Count Limit: It is the number of counts of the internal clock for the
Low Limit of the fan speed.
3Ch R/W
FAN2 Fan Count Limit: It is the number of counts of the internal clock for the
Low Limit of the fan speed.
3Dh Reserved.
3Eh R Company id number (Note 5).
3Fh R Stepping id number (Note 6).
NOTES:
1. Setting all 1s 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.
2. For the high limits of the voltages, the device is doing a greater than comparison. For the low limits,
however, it is doing a less than or equal comparison.
3. This register should only be used by the manufacturer for testing of the ASIC. Reading or writing to
this register during normal use may lead to erroneous events.