LM96194CISQ/NOPB National Semiconductor, LM96194CISQ/NOPB Datasheet - Page 47

• Manufacturer Part Number: LM96194CISQ/NOPB
• Description: IC TRUTHERM HDWR MONITOR 48-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®, TruTherm®r

Specifications of LM96194CISQ/NOPB

• Function: Fan Control, Temp Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 85°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM96194CISQTR

Register
Address
Register
Address
Register
Address
Register
Address
16.7.7 Registers 37h and 38h Zone 1 and 2 PI Controller Target Temperature (Tcontrol)
Same format as temperature value register for Zone 1 and Zone 2. The PWM output controls the airflow over the processors and
thus the temperature of the processors is adjusted by the PI loop to maintain the hottest Zone 1 or Zone 2 temperature reading
between their respective values for Tcontrol and Tcontrol - hysteresis. Intel specifies an optimum Tcontrol temperature for some
of it's processors that can be found in the MSR register space.
16.7.8 Register 39h and 3Ah Zone 1 and 2 PI Fan Control Off Temperature (Toff)
Same format as temperature value register for Zone 1 and Zone 2. When these registers are set to 80h, the Toff function is disabled.
Toff is the temperature at which the PI control loop output is forced to zero duty cycle.
16.7.9 Register 3Bh Proportional Coefficient
16.7.10 Register 3Ch Integral Coefficient
3Ch
37h
38h
39h
3Ah
3Bh
Read/
Read/
Read/
Read/
Write
Write
Write
Write
R/W
R/W
R/W
R/W
R/W
R/W
PI_MinPWM[3:0]
Register Name
Zone 1 Tcontrol
Zone 2 Tcontrol
Register Name
Register Name
Register Name
P Coefficient
I Coefficient
Z1 Toff
Z2 Toff
Ch
Dh
Ah
Bh
Eh
Fh
0h
1h
2h
3h
4h
5h
6h
7h
8h
9h
Bit 7
Bit 7
Bit 7
Bit 7
7
7
7
7
7
7
Bit 6
Bit 6
Bit 6
Bit 6
6
6
6
6
6
6
Bit 5
Bit 5
Bit 5
Bit 5
47
5
5
5
5
5
5
Bit 4
Bit 4
Bit 4
Bit 4
4
4
4
4
4
4
Minimum Duty Cycle
Bit 3
Bit 3
Bit 3
Bit 3
3
3
3
3
3
3
18.75%
25.00%
31.25%
37.50%
43.75%
50.00%
56.25%
62.50%
68.75%
75.00%
81.25%
93.75%
0.00%
6.25%
12.5%
87.5%
Bit 2
Bit 2
Bit 2
Bit 2
2
2
2
2
2
2
Bit 1
Bit 1
Bit 1
Bit 1
1
1
1
1
1
1
Bit 0
Bit 0
Bit 0
Bit 0
0
0
0
0
0
0
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Default
Default
Default
Default
Value
Value
Value
Value
00h
00h
80h
80h
00h
00h