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LM95221 Datasheet(PDF) 12 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM95221
Description  Dual Remote Diode Digital Temperature Sensor with SMBus Interface
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM95221 Datasheet(HTML) 12 Page - National Semiconductor (TI)

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2.0 LM95221 Registers (Continued)
2.1 STATUS REGISTER
(Read Only Address 02h):
D7
D6
D5
D4
D3
D2
D1
D0
Busy
Reserved
RD2M
RD1M
00000
Bits
Name
Description
7
Busy
When set to "1" the part is converting.
6-2
Reserved
Reports "0" when read.
1
Remote diode 2 missing (RD2M)
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.
0
Remote diode 1 missing (RD1M)
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.
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 66ms, 15 Hz (typ)
01: converts every 200ms, 5 Hz (typ)
10: converts every 1 second, 1 Hz (typ)
11: converts every 3 seconds, 13 Hz (typ)
Note: typically a remote diode conversion takes 26 ms and local
conversion takes 14 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
12


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