Datasheet

LM77
SNIS103F –JUNE 1999–REVISED MARCH 2013 www.ti.com
Temperature-to-Digital Converter Characteristics
Unless otherwise noted, these specifications apply for +V
S
=+5 Vdc ±10% for LM77CIM-5, LM77CIMM-5 and +V
S
=+3.3 Vdc
±10% for LM77CIM-3, LM77CIMM-3
(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.
Units
Parameter Test Conditions Typical
(2)
Limits
(3)
(Limit)
Accuracy T
A
= −10°C to +65°C ±1.5
T
A
= −25°C to +100°C ±2.0 °C (max)
T
A
= −55°C to +125°C ±3.0
Resolution See
(4)
10 Bits
0.5 °C
Temperature Conversion Time See
(5)
70 125 ms
Quiescent Current I
2
C Inactive 0.25 mA
I
2
C Active 0.25 0.5 mA (max)
Shutdown Mode 5 10 μA
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
C
Default Temperature See
(7)
80 °C
(1) Both part numbers of the LM77 will operate properly over the +V
S
supply voltage range of 3V to 5.5V . The devices are tested and
specified for rated accuracy at their nominal supply voltage. Accuracy will typically degrade 1°C/V of variation in +V
S
as it varies from
the nominal value.
(2) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(3) Limits are guaranteed to TI's AOQL (Average Outgoing Quality Level).
(4) 9 bits + sign, two's complement
(5) This specification is provided only to indicate how often temperature data is updated. The LM77 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 Section 1.1, TEMPERATURE
COMPARISON, and Figure 7.
(7) Default values set at power up.
Logic Electrical Characteristics Digital DC Characteristics
Unless otherwise noted, these specifications apply for +V
S
=+5 Vdc ±10% for LM77CIM-5, LM77CIMM-5 and +V
S
=+3.3 Vdc
±10% for LM77CIM-3, LM77CIMM-3. 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 Test Conditions Typical
(1)
Limits
(2)
(Limit)
V
IN(1)
SDA and SCL Logical “1” Input Voltage +V
S
× 0.7 V (min)
+V
S
+0.3 V (max)
V
IN(0)
SDA and SCL Logical “0” Input Voltage −0.3 V (min)
+V
S
× 0.3 V (max)
V
IN(1)
A0 and A1 Logical “1” Input Voltage 2.0 V (min)
+V
S
+0.3 V (max)
V
IN(0)
A0 and A1 Logical “0” Input Voltage −0.3 V (min)
0.8 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
Capacitance of All Digital Inputs 20 pF
I
OH
Logic “1” Output Leakage Current V
OH
= + V
S
10 μA (max)
(1) Typicals are at T
A
= 25°C and represent most likely parametric norm.
(2) Limits are guaranteed to TI's AOQL (Average Outgoing Quality Level).
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