Datasheet
LM95231
SNIS139E –FEBRUARY 2005–REVISED MARCH 2013
www.ti.com
Operating Ratings
(1)(2)
Operating Temperature Range 0°C to +125°C
Electrical Characteristics Temperature Range T
MIN
≤T
A
≤T
MAX
LM95231BIMM, LM95231CIMM 0°C≤T
A
≤+85°C
Supply Voltage Range (V
DD
) +3.0V to +3.6V
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is ensured to be functional, but do not ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics. The ensured specifications apply only for the test condition listed. Some performance
characteristics may degrade when the device is not operated under the listed test conditions. Operation of the device beyond the
Maximum Operating Ratings is not recommended.
(2) Thermal resistance junction-to-ambient when attached to a printed circuit board with 1oz. foil and no airflow:
— VSSOP-8 = 210°C/W
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 LM95231. T
D
is the
junction temperature of the remote thermal diode.
PARAMETER TEST CONDITIONS Typical
(
LM9523 LM9523 UNIT
1)
1 1
BIMM CIMM
Limits
(2)
Limits
(2)
Accuracy Using Local Diode T
A
= 0°C to +85°C
(3)(4)
±1 ±3 ±3 °C (max)
Accuracy Using Remote Diode, see
(5)
T
A
= +20°C to +40°C; T
D
= Intel 90nm Thermal ±0.75 °C (max)
for Thermal Diode Processor Type. +45°C to +85°C Diode
T
A
= +20°C to +40°C; T
D
= MMBT3904 Thermal ±1.25 °C (max)
+45°C to +85°C Diode
T
A
= +20°C to +40°C; T
D
= Intel 90nm and ±1.25 °C (max)
+45°C to +85°C MMBT3904 Thermal
Diodes
T
A
= +0°C to +85°C; T
D
= Intel 90nm and ±2.5 ±2.5 °C (max)
+25°C to +140°C MMBT3904 Thermal
Diodes
Remote Diode Measurement Resolution 10+sign/ Bits
with filtering turned off 11
0.125 °C
Remote Diode Measurement Resolution 12+sign/ Bits
with digital filtering turned on 13
0.03125 °C
Local Diode Measurement Resolution 9+sign Bits
0.25 °C
Conversion Time of All Temperatures at See
(6)
TruTherm Mode Disabled 75.8 83.9 83.9 ms
the Fastest Setting (max)
TruTherm Mode enabled 79.2 87.7 87.7 ms
(max)
Average Quiescent Current
(7)
SMBus Inactive, 1 Hz conversion rate 402 545 545 µA (max)
Shutdown 272 µA
D− Source Voltage 0.4 V
(1) Typicals are at T
A
= 25°C and represent most likely parametric norm at time of product characterization. The typical specifications are
not ensured.
(2) Limits are specified to 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 LM95231 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) Thermal resistance junction-to-ambient when attached to a printed circuit board with 1oz. foil and no airflow:
— VSSOP-8 = 210°C/W
(5) The accuracy of the LM95231 is ensured when using the thermal diode of Pentium 4 processor on 90nm process or an MMBT3904 type
transistor, as selected in the Remote Diode Model Select register.
(6) This specification is provided only to indicate how often temperature data is updated. The LM95231 can be read at any time without
regard to conversion state (and will yield last conversion result).
(7) Quiescent current will not increase substantially when the SMBus is active.
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