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LM95231BIMM-1 Datasheet(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM95231BIMM-1
Description  Precision Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM95231BIMM-1 Datasheet(HTML) 14 Page - National Semiconductor (TI)

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2.0 LM95231 Registers (Continued)
2.1 STATUS REGISTER
(Read Only Address 02h):
D7
D6
D5
D4
D3
D2
D1
D0
Busy
Reserved
R2TME
R1TME
RD2M
RD1M
000
Bits
Name
Description
7
Busy
When set to "1" the part is converting.
6-4
Reserved
Reports "0" when read.
3
Remote 2 TruTherm Mode
Enabled (R2TME)
When set to "1" indicates that the TruTherm Mode has been activated
for Remote diode 2. After being enabled TruTherm Mode will take at
most one conversion cycle to be fully active.
2
Remote 1 TruTherm Mode
Enabled (R2TME)
When set to "1" indicates that the TruTherm Mode has been activated
for Remote diode 1. After being enabled TruTherm Mode will take at
most one conversion cycle to be fully active.
1
Remote Diode 2 Missing (RD2M)
When set to "1" Remote Diode 2 is missing. (i.e. D2+ shorted to V
DD,
Ground or D2-, or D2+ is floating). Temperature Reading is FFE0h
which converts to 255.875 ˚C if unsigned format is selected or 8000h
which converts to –128.000 ˚C if signed format is selected. Note,
connecting a 2N3904 transistor to Remote 2 inputs with TruTherm
mode active may also cause this bit to be set.
0
Remote Diode 1 Missing (RD1M)
When set to "1" Remote Diode 1 is missing. (i.e. D1+ shorted to V
DD,
Ground or D1-, or D1+ is floating). Temperature Reading is FFE0h
which converts to 255.875 ˚C if unsigned format is selected or 8000h
which converts to –128.000 ˚C if signed format is selected. Note,
connecting a 2N3904 transistor to Remote 1 inputs with TruTherm
mode active may also cause this bit to be set.
2.2 CONFIGURATION REGISTER
(Read Address 03h /Write Address 03h):
D7
D6
D5
D4
D3
D2
D1
D0
0
RUN/STOP
CR1
CR0
0
R2DF
R1DF
0
Bits
Name
Description
7
Reserved
Reports "0" when read.
6
RUN/STOP
Logic 1 disables the conversion and puts the part in standby mode.
Conversion can be activated by writing to one-shot register.
5-4
Conversion Rate (CR1:CR0)
00: continuous mode 75.8 ms, 13.2 Hz (typ), when diode mode is
selected for both remote channels; 77.5 ms, 12.9 Hz (typ), when
TruTherm Mode is enabled for one remote channel.
01: converts every 182 ms, 5.5 Hz (typ)
10: converts every 1 second, 1 Hz (typ)
11: converts every 2.7 seconds, 0.37 Hz (typ)
Note: typically a remote diode conversion takes 30 ms with diode
mode is selected; when the TruTherm Mode is selected a conversion
takes an additional 1.7 ms; a local conversion takes 15.8 ms.
3
Reserved
Reports "0" when read.
2
Remote 2 Data Format (R2DF)
Logic 0: unsigned Temperature format (0 ˚C to +255.875 ˚C)
Logic 1: signed Temperature format (-128 ˚C to +127.875 ˚C)
1
Remote 1 Data Format (R1DF)
Logic 0: unsigned Temperature format (0 ˚C to +255.875 ˚C)
Logic 1: signed Temperature format (-128 ˚C to +127.875 ˚C)
0
Reserved
Reports "0" when read.
Power up default is with all bits “0” (zero)
www.national.com
14


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