Datasheet

LM95231
SNIS139E –FEBRUARY 2005–REVISED MARCH 2013 www.ti.com
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 When set to "1" indicates that the TruTherm Mode has been activated for
(R2TME) 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 When set to "1" indicates that the TruTherm Mode has been activated for
(R2TME) 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.
CONFIGURATION REGISTER
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)
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