LM87CIMT/NOPB National Semiconductor, LM87CIMT/NOPB Datasheet - Page 29

• Manufacturer Part Number: LM87CIMT/NOPB
• Description: IC INTERFACE SER MONITOR 24TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM87CIMT/NOPB

• Function: Hardware Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.8 V ~ 3.8 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM87CIMT; *LM87CIMT/NOPB; LM87CIMT

Bit
Bit
Bit
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Address A6–A0
13.16 Interrupt Status Register 2 Mirror—Address 4Dh
Power on default – <7:0> = 0000 0000 binary
13.17 SMBALERT# Enable—Address 80h
Power on default – <7:0> = 0010 0000 binary
13.18 Value RAM—Address 19h–3Fh
FAN1/AIN1
FAN2/AIN2
+12Vin
Vccp2
Reserved
Reserved
CI
THERM#
D1 Fault
D2 Fault
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
SMBALERT#
Enable
Reserved
Name
1Ah
1Bh
2Ah
2Bh
2Ch
2Dh
2Eh
19h
20h
21h
22h
23h
24h
25h
26h
27h
28h
29h
Name
Name
Read Only
Read Only
Read Only
DAC data register; power on default <7:0>=1111 1111 binary
AIN1 Low Limit
AIN2 Low Limit
+2.5V/External Temperature 2 reading
Vccp1 reading
+Vcc reading
+5V reading
+12V reading
Vccp2 reading
External Temperature 1 reading
Internal Temperature reading
FAN1/AIN1 reading
Note: For the FAN reading, this location stores the number of counts of the internal clock per revolution.
FAN2/AIN2 reading
Note: For the FAN reading, this location stores the number of counts of the internal clock per revolution.
Reserved
+2.5V High Limit/External Temperature 2 High Limit
+2.5V Low Limit/External Temperature 2 Low Limit
Vccp1 High Limit
Vccp1 Low Limit
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read/Write
Read Only
Read/Write
Read Only
A one indicates the fan count limit has been exceeded or an AIN1 High or Low limit has been
exceeded.
A one indicates the fan count limit has been exceeded or an AIN2 High or Low limit has been
exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates the CI (Chassis Intrusion) input has gone high.
A one indicates the THERM# input has been pulled low by external circuitry.
A one indicates the D1 inputs are shorted to Vcc or open circuit.
A one indicates the D2 inputs are shorted to Vcc or open circuit.
A one enables the SMBALERT# mode of operation.
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Description
Description
Description
Description
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