DS1780E Maxim Integrated Products, DS1780E Datasheet - Page 21

• Manufacturer Part Number: DS1780E
• Description: IC CPU PERIPHERAL MON 24-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS1780E

• Function: Thermal Monitor, CPU Peripherals
• Topology: ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.8 V ~ 5.75 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Full Temp Accuracy: +/- 12 %
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 8 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

VALUE RAM (ADDRESS 0x15h - 0x3Dh) Table 10.15
NOTES:
1. Setting all 1s to the high limits for voltages and fans (0111 1111 binary for temperature) means
2. For the high limits of the voltages, the device is doing a greater than comparison. For the low limits,
3. This register should only be used by the manufacturer for testing of the ASIC. Reading or writing to
ADDRESS <A7:A0>h
interrupts will never be generated except the case when voltages go below the low limits.
however, it is doing a less than or equal comparison.
this register during normal use may lead to erroneous events.
2Ah
2Dh
3Ah
3Dh
2Bh
2Ch
3Bh
3Ch
2Eh
2Fh
3Eh
3Fh
20h
21h
22h
23h
24h
25h
26h
27h
28h
29h
30h
31h
32h
33h
34h
35h
36h
37h
38h
39h
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
R
R
R
R
+2.5V Input Reading.
V
+3.3V Input Reading.
+5V Input Reading.
+12V Input Reading.
+2.5V_Sense/V
Reserved.
Temperature reading (Most significant 8-bits).
FAN1 reading: This location stores the number of counts of the
internal clock per revolution.
FAN2 reading: This location stores the number of counts of the
internal clock per revolution.
Reserved.
+2.5V High Limit (Note 1, 2).
+2.5V Low Limit (Note 2).
+V
+V
+3.3V High Limit (Note 1, 2).
+3.3V Low Limit (Note 2).
+5V High Limit (Note 1, 2).
+5V Low Limit (Note 2).
+12V High Limit (Note 1, 2).
+12V Low Limit (Note 2).
+2.5V_Sense/Vccp2 High Limit (Note 1, 2).
+2.5V_Sense/Vccp2 Low Limit (Note 2).
Reserved.
Reserved.
Hot Temperature (High) Limit (Note 1).
Hot Temperature Hysteresis (Low) Limit.
FAN1 Fan Count Limit: It is the number of counts of the internal clock for the
Low Limit of the fan speed.
FAN2 Fan Count Limit: It is the number of counts of the internal clock for the
Low Limit of the fan speed.
Reserved.
Company id number (Note 5).
Stepping id number (Note 6).
CCP1
CCP1
CCP1
Input Reading.
High Limit (Note 1, 2).
Low Limit (Note 2).
21 of 28
CCP2
Input Reading.
DESCRIPTION