Datasheet

LM75A
SNOS808O –JANUARY 2000–REVISED MAY 2013 www.ti.com
TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS
Unless otherwise noted, these specifications apply for: +V
S
= +2.7 to 5.5 Vdc for LM75AIM. 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.
Units
Parameter Conditions Typical
(1)
Limits
(2)
(Limit)
T
A
= −25°C to +100°C ±2.0
Accuracy °C (max)
T
A
= −55°C to +125°C ±3.0
Resolution 9 Bits
Temperature Conversion Time See
(3)
100 300 ms (max)
I
2
C Inactive 0.28 0.5 mA (max)
Quiescent Current LM75A Shutdown Mode, +V
S
= 3V 4 μA
Shutdown Mode, +V
S
= 5V 6 μA
O.S. Output Saturation Voltage I
OUT
= 4.0 mA 0.8 V (max)
1 Conversion (min)
O.S. Delay See
(4)
6 Conversions (max)
T
OS
Default Temperature See
(5)
80 °C
T
HYST
Default Temperature See
(5)
75 °C
(1) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(2) Limits are ensured to AOQL (Average Outgoing Quality Level).
(3) The conversion-time specification is provided to indicate how often the temperature data is updated. The LM75A can be accessed at
any time and reading the Temperature Register will yield result from the last temperature conversion. When the LM75A is accessed, the
conversion that is in process will be interrupted and it will be restarted after the end of the communication. Accessing the LM75A
continuously without waiting at least one conversion time between communications will prevent the device from updating the
Temperature Register with a new temperature conversion result. Consequently, the LM75A should not be accessed continuously with a
wait time of less than 300ms.
(4) O.S. Delay is user programmable up to 6 “over limit” conversions before O.S. is set to minimize false tripping in noisy environments.
(5) Default values set at power up.
LOGIC ELECTRICAL CHARACTERISTICS
DIGITAL DC CHARACTERISTICS
Unless otherwise noted, these specifications apply for +V
S
= +2.7 to 5.5 Vdc for LM75AIM and LM75AIMM. 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.
Units
Symbol Parameter Conditions Typical
(1)
Limits
(2)
(Limit)
+V
S
× 0.7 V (min)
V
IN(1)
Logical “1” Input Voltage
+V
S
+ 0.3 V (max)
−0.3 V (min)
V
IN(0)
Logical “0” Input Voltage
+V
S
× 0.3 V (max)
I
IN(1)
Logical “1” Input Current V
IN
= +V
S
0.005 1.0 μA (max)
I
IN(0)
Logical “0” Input Current V
IN
= 0V −0.005 −1.0 μA (max)
C
IN
All Digital Inputs 5 pF
High Level Output Current
I
OH
LM75A V
OH
= 5V 1 μA (max)
Open drain leakage
V
OL
Low Level Output Voltage I
OL
= 3 mA 0.4 V (max)
C
L
= 400 pF I
O
= 250
t
OF
Output Fall Time ns (max)
3 mA
(1) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(2) Limits are ensured to AOQL (Average Outgoing Quality Level).
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