Datasheet

LM95241
SNIS143E –AUGUST 2006–REVISED MARCH 2013 www.ti.com
Remote Temperature MSB
(Read Only Address 11h, 12h) 10-bit plus sign format:
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value SIGN 64 32 16 8 4 2 1
Temperature Data: LSb = 1°C.
Remote Temperature MSB
(Read Only Address 11h, 12h) 11-bit plus sign format:
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value 128 64 32 16 8 4 2 1
Temperature Data: LSb = 1°C.
Remote Temperature LSB
(Read Only Address 21, 22h) 10-bit plus sign or 11-bit unsigned binary formats with filter off:
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value 0.5 0.25 0.125 0 0 0 0 0
Temperature Data: LSb = 0.125°C or 1/8°C.
Remote Temperature LSB
12-bit plus sign or 13-bit unsigned binary formats with filter on:
BIT D7 D6 D5 D4 D3 D2 D1 D0
Value 0.5 0.25 0.125 0.0625 0.03125 0 0 0
Temperature Data: LSb = 0.03125°C or 1/32°C.
For data synchronization purposes, the MSB register should be read first if the user wants to read both MSB and
LSB registers. The LSB will be locked after the MSB is read. The LSB will be unlocked after being read. If the
user reads MSBs consecutively, each time the MSB is read, the LSB associated with that temperature will be
locked in and override the previous LSB value locked-in.
MANUFACTURERS ID REGISTER
(Read Address FEh) The default value is 01h.
DIE REVISION CODE REGISTER
(Read Address FFh) The default value is A4h. This register will increment by 1 every time there is a revision to
the die by Texas Instruments.
Applications Hints
The LM95241 can be applied easily in the same way as other integrated-circuit temperature sensors, and its
remote diode sensing capability allows it to be used in new ways as well. It can be soldered to a printed circuit
board, and because the path of best thermal conductivity is between the die and the pins, its temperature will
effectively be that of the printed circuit board lands and traces soldered to the LM95241's pins. This presumes
that the ambient air temperature is almost the same as the surface temperature of the printed circuit board; if the
air temperature is much higher or lower than the surface temperature, the actual temperature of the LM95241 die
will be at an intermediate temperature between the surface and air temperatures. Again, the primary thermal
conduction path is through the leads, so the circuit board temperature will contribute to the die temperature much
more strongly than will the air temperature.
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