Datasheet

LM76
SNIS109E –JANUARY 2000–REVISED MARCH 2013 www.ti.com
Temperature-to-Digital Converter Characteristics
Unless otherwise noted, these specifications apply for +V
S
= +5.0 Vdc ±10% for the LM76CHM-5.
(1)
. Boldface limits apply
for T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= +25°C, unless otherwise noted.
Typical
(2)
LM76CNM-3 LM76CHM-5 Units
Parameter Conditions
Limits
(3)
Limits
(3)
(Limit)
T
A
= +70°C to +100°C ±1.0
T
A
= −20°C to +85°C for
±1.5
LM76CHM-5
Accuracy
(1)
T
A
= −10°C to +45°C ±1.0
T
A
= +25°C ±0.5
13 Bits
Resolution See
(4)
0.0625 °C
Temperature Conversion Time See
(5)
400 500 1000 ms
I
2
C Inactive 0.25 mA
I
2
C Active 0.25 0.5 0.45 mA (max)
Shutdown Mode: 5 µA
Quiescent Current
12 18 µA (max)
T
A
= +85°C 8 µA (max)
T
A
= +25°C 12 µA (max)
T
HYST
Default Temperature See
(6)(7)
2 °C
T
LOW
Default Temperature See
(7)
10 °C
T
HIGH
Default Temperature See
(7)
64 °C
T
CRIT
Default Temperature See
(7)
80 °C
(1) The LM76 will operate properly over the +V
S
supply voltage range of 3V to 5.5V for the LM76CNM-3 and the LM76CHM-5. The
LM76CNM-3 is tested and specified for rated accuracy at the nominal supply voltage of 3.3V. Accuracy of the LM76CNM-3 will degrade
0.2°C for a ±1% variation in +V
S
from the nominal value. The LM76CHM-5 is tested and specified for a rated accuracy at the nominal
supply voltage of 5.0V. Accuracy of the LM76CHM-5 will degrade 0.08°C for a ±1% variation in +V
S
from the nominal value.
(2) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(3) Limits are ensured to AOQL (Average Outgoing Quality Level).
(4) 12 bits + sign, two's complement
(5) This specification is provided only to indicate how often temperature data is updated. The LM76 can be read at any time without regard
to conversion state (and will yield last conversion result). If a conversion is in process it will be interrupted and restarted after the end of
the read.
(6) Hysteresis value adds to the T
LOW
setpoint value (e.g.: if T
LOW
setpoint = 10°C, and hysteresis = 2°C, then actual hysteresis point is
10+2 = 12°C); and subtracts from the T
HIGH
and T_CRIT setpoints (e.g.: if T
HIGH
setpoint = 64°C, and hysteresis = 2°C, then actual
hysteresis point is 64−2 = 62°C). For a detailed discussion of the function of hysteresis refer to TEMPERATURE COMPARISON, and
Figure 6.
(7) Default values set at power up.
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