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LM77 データシート(PDF) 4 Page - Texas Instruments

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部品番号 LM77
部品情報  LM77 9-Bit Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM77
SNIS103F – JUNE 1999 – REVISED MARCH 2013
www.ti.com
Temperature-to-Digital Converter Characteristics
Unless otherwise noted, these specifications apply for +VS=+5 Vdc ±10% for LM77CIM-5, LM77CIMM-5 and +VS=+3.3 Vdc
±10% for LM77CIM-3, LM77CIMM-3
(1). Boldface limits apply for T
A = TJ = TMIN to TMAX; all other limits TA= TJ=+25°C,
unless otherwise noted.
Units
Parameter
Test Conditions
Typical(2)
Limits(3)
(Limit)
Accuracy
TA = −10°C to +65°C
±1.5
TA = −25°C to +100°C
±2.0
°C (max)
TA = −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
I2C Inactive
0.25
mA
I2C Active
0.25
0.5
mA (max)
Shutdown Mode
5
10
μA
THYST Default Temperature
See(6)(7)
2
°C
TLOW Default Temperature
See(7)
10
°C
THIGH Default Temperature
See(7)
64
°C
TC Default Temperature
See(7)
80
°C
(1)
Both part numbers of the LM77 will operate properly over the +VS 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 +VS as it varies from
the nominal value.
(2)
Typicals are at TA = 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 TLOW setpoint value (e.g.: if TLOW setpoint = 10°C, and hysteresis = 2°C, then actual hysteresis point is
10+2 = 12°C); and subtracts from the THIGH and T_CRIT setpoints (e.g.: if THIGH 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 +VS=+5 Vdc ±10% for LM77CIM-5, LM77CIMM-5 and +VS=+3.3 Vdc
±10% for LM77CIM-3, LM77CIMM-3. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA= TJ=+25°C, unless
otherwise noted.
Units
Parameter
Test Conditions
Typical(1)
Limits(2)
(Limit)
VIN(1)
SDA and SCL Logical “1” Input Voltage
+VS × 0.7
V (min)
+VS+0.3
V (max)
VIN(0)
SDA and SCL Logical “0” Input Voltage
−0.3
V (min)
+VS × 0.3
V (max)
VIN(1)
A0 and A1 Logical “1” Input Voltage
2.0
V (min)
+VS+0.3
V (max)
VIN(0)
A0 and A1 Logical “0” Input Voltage
−0.3
V (min)
0.8
V (max)
IIN(1)
Logical “1” Input Current
VIN = + VS
0.005
1.0
μA (max)
IIN(0)
Logical “0” Input Current
VIN = 0V
−0.005
−1.0
μA (max)
CIN
Capacitance of All Digital Inputs
20
pF
IOH
Logic “1” Output Leakage Current
VOH = + VS
10
μA (max)
(1)
Typicals are at TA = 25°C and represent most likely parametric norm.
(2)
Limits are guaranteed to TI's AOQL (Average Outgoing Quality Level).
4
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