Datasheet
LM95221
SNIS134B –MAY 2004–REVISED MARCH 2013
www.ti.com
Temperature-to-Digital Converter Characteristic
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 LM95221. 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
= +30°C to T
D
= +45°C to ±1 °C (max)
Diode Processor Type. +50°C +85°C
T
A
= +0°C to +85°C T
D
= +25°C to ±3 °C (max)
+140°C
Remote Diode Measurement Resolution 11 Bits
0.125 °C
Local Diode Measurement Resolution 10 Bits
0.25 °C
Conversion Time of All Temperatures at the Fastest See
(5)
66 73 ms (max)
Setting
Quiescent Current
(6)
SMBus Inactive, 15Hz conversion 2.0 2.6 mA (max)
rate
Shutdown 335 µA
D− Source Voltage 0.7 V
Diode Source Current (D+ − D−)=+ 0.65V; high-level 188 315 µA (max)
110 µA (min)
Low-level 11.75 20 µA (max)
7 µA (min)
Low-Level Diode Source Current Variation over T
A
= +30°C to +50°C +0.5 µA
Temperature
T
A
= +30°C to +85°C +1.5 µA
Power-On Reset Threshold Measure on V
DD
input, falling edge 2.4 V (max)
1.8 V (min)
(1) Typicals are at T
A
= 25°C and represent most likely parametric normal.
(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 LM95221 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 LM95221CIMM is ensured when using the thermal diode with a non-ideality of 1.008 and series R= 2.7Ω. When
using an MMBT3904 type transistor as the thermal diode the error band will be offset by -3.25°C
(5) This specification is provided only to indicate how often temperature data is updated. The LM95221 can be read at any time without
regard to conversion state (and will yield last conversion result).
(6) Quiescent current will not increase substantially with an SMBus.
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