LM81CIMT-3/NOPB National Semiconductor, LM81CIMT-3/NOPB Datasheet - Page 27

• Manufacturer Part Number: LM81CIMT-3/NOPB
• Description: IC MONITOR SYS HARDWAR 24-TSSOP
• Manufacturer: National Semiconductor

Specifications of LM81CIMT-3/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: SMBus™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.8 V ~ 3.8 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Supply Voltage Range: 2.8V To 3.8V
• Reset Type: Active-Low
• Supply Current: 1.4mA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 24
• Operating Temperature Range: -40°C To +125°C
• Rohs Compliant: Yes
• Monitored Voltage: 2.5 V , 3.3 V , 5 V , 12 V
• Manual Reset: Not Resettable
• Watchdog: Watchdog
• Battery Backup Switching: No
• Supply Voltage (max): 3.8 V
• Supply Voltage (min): 2.8 V
• Supply Current (typ): 400 uA (Typ)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM81CIMT-3; *LM81CIMT-3/NOPB; LM81CIMT-3

Bit
Bit
Bit
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Functional Description
13.4 Interrupt Status Register 1 — Address 41h
Power on default –
13.5 Interrupt Status Register 2 — Address 42h
Power on default –
13.6 Interrupt Mask Register 1 — Address 43h
Power on default –
+12Vin
Vccp2
Reserved
Reserved
CI
Reserved
Reserved
TLOW
+2.5Vin
Vccp1
+3.3Vin
+5Vin
Temperature
Reserved
FAN1
FAN2
+2.5Vin
Vccp1
+3.3Vin
+5Vin
Temperature
Reserved
FAN1
FAN2
Name
Name
Name
<
<
<
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
7:0
7:0
7:0
Read/
Write
>
>
>
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
= 0000 0000 binary
= 0000 0000 binary
Read/Write
= 0000 0000 binary
A one disables the corresponding interrupt status bit for INT interrupt.
A one disables the corresponding interrupt status bit for INT interrupt.
A one disables the corresponding interrupt status bit for INT interrupt.
A one disables the corresponding interrupt status bit for INT interrupt.
A one disables the corresponding interrupt status bit for INT interrupt.
A one disables the corresponding interrupt status bit for INT interrupt.
A one disables the corresponding interrupt status bit for INT interrupt.
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 a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates a HIGH or HIHYST temperature error, see SECTION 8.2 .
A one indicates the fan count limit has been exceeded.
A one indicates the fan count limit has been exceeded.
(Continued)
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 CI (Chassis Intrusion) has gone high.
A one indicates LOW temperature error in EXTENDED MODE ONLY, see
SECTION 8.2 .
27
Description
Description
Description
www.national.com