LM95214CISD National Semiconductor, LM95214CISD Datasheet - Page 11

• Manufacturer Part Number: LM95214CISD
• Description: SENSOR, TEMP, 4-DIODE, 2-WIRE I/F
• Manufacturer: National Semiconductor

Specifications of LM95214CISD

• Ic Output Type: Current
• Sensing Accuracy Range: ± 1°C
• Supply Current: 0.57mA
• Supply Voltage Range: 3V To 3.6V
• Resolution (bits): 11bit
• Sensor Case Style: LLP
• No. Of Pins: 14
• Svhc: No SVHC
• Temperature Sensing Range: -40°C To +140°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.
1.3 SMBus INTERFACE
The LM95214 operates as a slave on the SMBus, so the
SMBCLK line is an input and the SMBDAT line is bidirectional.
The LM95214 never drives the SMBCLK line and it does not
support clock stretching. According to SMBus specifications,
the LM95214 has a 7-bit slave address. Three SMBus device
address can be selected by connecting A0 (pin 6) to either
Low, Mid-Supply or High voltages. The LM95214 has the fol-
lowing SMBus slave address:
1.4 TEMPERATURE CONVERSION SEQUENCE
Each of the 5 temperature channels of LM95214 can be
turned OFF independent from each other via the Channel
Enable Register. Turning off unused channels will increase
the conversion speed in the fastest conversion speed mode.
If the slower conversion speed settings are used, disabling
a) Seventeen and fifty degree step
A0 Pin State
Mid-Supply
Revision ID set to 7Bh
High
Low
response
SMBus Device Address A[6:0]
Hex
4Dh
4Eh
18h
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FIGURE 2. Filter Impulse and Step Response Curves
001 1000
100 1101
100 1110
Binary
b) Impulse response with input
transients less than 4°C
11
unused channels will reduce the average power consumption
of LM95214.
1.4.1 Digital Filter
In order to suppress erroneous remote temperature readings
due to noise as well as increase the resolution of the temper-
ature, the LM95214 incorporates a digital filter for Remote 1
and 2 Temperature Channels. When a filter is enabled the
filtered readings are used for the TCRIT comparisons. There
are two possible digital filter settings that are enabled through
the Filter Setting Register at register address 0Fh. The filter
for each channel can be set according to the following table:
Figure 2 describes the filter output in response to a step input
and an impulse input.
R1F[1:0] or R2F[1:0]
0
0
1
1
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0
1
0
1
c) Impulse response with input
transients great than 4°C
Filter (equivalent to Level 2
Enhanced Filter (Filter with
filter of the LM86/LM89)
transient noise clipping)
Filter Setting
Reserved
No Filter
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