Datasheet

LM95241
www.ti.com SNIS143E –AUGUST 2006–REVISED MARCH 2013
Temperature-to-Digital Converter Characteristics
Unless otherwise noted, these specifications apply for V
DD
=+3.0Vdc to 3.6Vdc. Boldface limits apply for T
A
= T
J
=
T
MIN
≤T
A
≤T
MAX
; all other limits T
A
= T
J
=+25°C, unless otherwise noted. T
J
is the junction temperature of the LM95241. T
D
is the
junction temperature of the remote thermal diode.
Parameter Conditions Typical
(1)
Limits
(2)
Units
(Limit)
Accuracy Using Local Diode T
A
= 0°C to +85°C
(3)
±1 ±3 °C (max)
Accuracy Using Remote Diode, see
(4)
for Thermal T
A
= +20°C to T
D
= +45°C to ±1.25 °C (max)
Diode Processor Type. +40°C +85°C
T
A
= +0°C to +85°C T
D
= +25°C to ±2.5 °C (max)
+140°C
Remote Diode Measurement Resolution with 10+sign/11 Bits
filtering turned off
0.125 °C
Remote Diode Measurement Resolution with digital 12+sign/13 Bits
filtering turned on
0.03125 °C
Local Diode Measurement Resolution 9+sign Bits
0.25 °C
Conversion Time of All Temperatures at the Fastest TruTherm Mode Disabled for All 76.5 86.1 ms (max)
Setting
(5)
Remote Channels
TruTherm Mode Enabled for All 79.1 88.9 ms (max)
Remote Channels
Average Quiescent Current
(6)
SMBus Inactive, 1 Hz conversion 471 640 µA (max)
rate
Shutdown 356 µA
D− Source Voltage 0.4 V
Diode Source Current Ratio 16
Diode Source Current (V
D+
− V
D−
)=+ 0.65V; high-level 172 230 µA (max)
100 µA (min)
Low-level 11 µA
Power-On Reset Threshold Measure on V
DD
input, falling edge 2.7 V (max)
1.6 V (min)
(1) Typical figures are at T
A
= 25°C and represent most likely parametric norms at the time of product characterization. The typical
specifications are not ensured.
(2) Limits are specified to Texas Instruments' AOQL (Average Outgoing Quality Level).
(3) Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the
internal power dissipation of the LM95241 and the thermal resistance. See Note 2 of the Operating Ratings table for the thermal
resistance to be used in the self-heating calculation.
(4) The accuracy of the LM95241CIMM is ensured when using a typical thermal diode of an Intel processor on a 65 nm process or an
MMBT3904 diode-connected transistor, as selected in the Remote Diode Model Select register. See typical performance curve for
performance with Intel processor on a 90nm process.
(5) This specification is provided only to indicate how often temperature data is updated. The LM95241 can be read at any time without
regard to conversion state (and will yield last conversion result).
(6) Quiescent current will not increase substantially when the SMBus is active.
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