LM96194CISQ/NOPB National Semiconductor, LM96194CISQ/NOPB Datasheet - Page 76

• 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

www.national.com
Register
Address
16.13.7 Register C2h Zones 1/2 Spike Smoothing Control
If all the REMOTE1 or REMOTE2 pins are connected to a processor or chipset, instantaneous temperature spikes may be sampled
by the LM96194. If these spikes are not ignored, the PWM outputs may cause the fans to turn on prematurely and produce
unpleasant noise. Also, false error events may occur. For this reason, any zone that is connected to a chipset or processor may
need spike smoothing enabled. The spike smoothing provides additional filtering above and beyond any ΣΔ A/D inherent averaging.
When spike smoothing is enabled, the temperature reading registers still reflect the current value of the temperature—not the
filtered value. Only the filtered temperature registers reflect the filtered value.
C2h
Read/
Write
R/W
2:0
6:4
Bit
3
7
Zones 1/2 Spike
Smoothing
Register
Control
Name
ZN1E
ZN2E
Name
ZN1
ZN2
ZN1 or ZN2
R/W
R/W
R/W
R/W
R/W
0h
1h
2h
3h
4h
5h
6h
7h
ZN2E
Bit 7
Configures the spike smoothing characteristics for zone
1a and 1b
When set, the filtered temperature for zone 1a and 1b is
used for both limit checking and auto-fan control instead
of the unfiltered temperature. Even when this bit is
cleared, the filtered temperature can be read by software
from the filtered temperature register.
Configures the spike smoothing characteristics for zone
2a and 2b
When set, the filtered temperature for zone 2a and 2b is
used for both limit checking and auto-fan control instead
of the unfiltered temperature. Even when this bit is
cleared, the filtered temperature can be read by software
from the filtered temperature register.
Bit 6
76
Spike Smoothed Over
Bit 5
ZN2
11.8 seconds
7.0 seconds
4.4 seconds
3.0 seconds
1.6 seconds
0.8 seconds
0.6 seconds
0.4 seconds
Bit 4
Description
ZN1E
Bit 3
Bit 2
Bit 1
ZN1
Bit 0
Default
Value
00h