LM95214EB/NOPB National Semiconductor, LM95214EB/NOPB Datasheet - Page 12

• Manufacturer Part Number: LM95214EB/NOPB
• Description: BOARD EVALUATION FOR LM95214
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM95214EB/NOPB

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 140°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: LM95214
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM95214EB

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processor on a 65 nm or 90 nm process. The filter curves
Figure 3 shows the filter in use in a typical system. Note that
the two curves have been purposely offset for clarity. Inserting
the filter does not induce an offset as shown.
1.5 FAULT QUEUE
In order to suppress erroneous TCRIT1,TCRIT2 and
TCRIT3 triggering the LM95214 incorporates a Fault Queue
for the unfiltered remote channels 3 and 4. The Fault Queue
acts to ensure the remote temperature measurement of these
channels is genuinely beyond the corresponding Tcrit limit by
not triggering until three consecutive out of limit measure-
ments have been made, see Figure 4 for an example. The
Fault Queue defaults on upon power-up. The fault queue for
channels 3 and 4 can be turned ON or OFF via bits 0 and 1
of the Configuration Register. When the fault queue is en-
abled, the TCRIT1, TCRIT2 and TCRIT3 pins will be triggered
if the temperature is above the Tcrit limit for 3 consecutive
conversions and the corresponding mask bit is 0 in the TCRIT
Mask registers. Similarly the temperature needs to be below
the Tcrit limit minus the hysteresis value for three consecutive
FIGURE 3. Digital Filter Response in a typical Intel
were purposely offset for clarity.
30006128
12
conversions for the TCRIT1, TCRIT2 and TCRIT3 pins to de-
activate.
1.6 TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and Re-
mote Temperature value registers. The data format for all
temperature values is left justified 16-bit word available in two
8-bit registers. Unused bits will always report "0". All temper-
ature data is clamped and will not roll over when a tempera-
ture exceeds full-scale value.
Remote temperature data for all channels can be represented
by an 11-bit, two's complement word or unsigned binary word
with an LSb (Least Significant Bit) equal to 0.125°C.
FIGURE 4. Fault Queue Response Diagram (with 0°C
Temperature
Temperature
+255.875°C
+0.125°C
−0.125°C
+125°C
+255°C
+201°C
+125°C
+25°C
−25°C
−55°C
+25°C
+1°C
−1°C
+1°C
0°C
11-bit, 2's complement (10-bit plus sign)
11-bit, unsigned binary
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0010 0000
0000 0000 0000 0000
1111 1111 1110 0000
1111 1111 0000 0000
1110 0111 0000 0000
1100 1001 0000 0000
1111 1111 1110 0000
1111 1111 0000 0000
1100 1001 0000 0000
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
hysteresis)
Binary
Binary
Digital Output
Digital Output
7D00h
FFE0h
C900h
FFE0h
C900h
7D00h
FF00h
E700h
FF00h
1900h
0100h
0020h
0000h
1900h
0100h
Hex
Hex
30006129