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LM77 データシート(PDF) 4 Page - Texas Instruments |
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LM77 データシート(HTML) 4 Page - Texas Instruments |
4 / 23 page 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 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM77 |
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