LM95231_06 NSC [National Semiconductor], LM95231_06 Datasheet - Page 14

• Manufacturer Part Number: LM95231_06
• Description: Precision Dual Remote Diode Temperature Sensor with SMBus Interface and TruTherm Technology
• Manufacturer: NSC [National Semiconductor]

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2.0 LM95231 Registers
2.1 STATUS REGISTER
2.2 CONFIGURATION REGISTER
Power up default is with all bits “0” (zero)
Bits
7
6-4
3
2
1
0
(Read Address 03h /Write Address 03h):
Bits
7
6
5-4
3
2
1
0
D7
0
(Read Only Address 02h):
Busy
D7
RUN/STOP
Name
Busy
Reserved
Remote 2 TruTherm Mode
Enabled (R2TME)
Remote 1 TruTherm Mode
Enabled (R2TME)
Remote Diode 2 Missing (RD2M)
Remote Diode 1 Missing (RD1M)
Name
Reserved
RUN/STOP
Conversion Rate (CR1:CR0)
Reserved
Remote 2 Data Format (R2DF)
Remote 1 Data Format (R1DF)
Reserved
D6
D6
0
CR1
D5
Reserved
(Continued)
D5
0
CR0
Description
When set to "1" the part is converting.
Reports "0" when read.
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.
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.
When set to "1" Remote Diode 2 is missing. (i.e. D2+ shorted to V
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.
When set to "1" Remote Diode 1 is missing. (i.e. D1+ shorted to V
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.
Description
Reports "0" when read.
Logic 1 disables the conversion and puts the part in standby mode.
Conversion can be activated by writing to one-shot register.
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.
Reports "0" when read.
Logic 0: unsigned Temperature format (0 ˚C to +255.875 ˚C)
Logic 1: signed Temperature format (-128 ˚C to +127.875 ˚C)
Logic 0: unsigned Temperature format (0 ˚C to +255.875 ˚C)
Logic 1: signed Temperature format (-128 ˚C to +127.875 ˚C)
Reports "0" when read.
D4
D4
0
14
R2TME
D3
D3
0
R1TME
D2
R2DF
D2
RD2M
D1
R1DF
D1
RD1M
D0
D0
0
DD
DD
,
,