Rainbow-electronics LM82 Manual de usuario Pagina 1

LM82Remote Diode and Local Digital Temperature Sensorwith Two-Wire InterfaceGeneral DescriptionThe LM82 is a digital temperature sensor with a 2 wire

1.0 Functional Description (Continued)6. Local and Remote T_CRIT set to 127˚C1.5 SMBus INTERFACEThe LM82 operates as a slave on the SMBus, so theSMBCL

1.0 Functional Description (Continued)1.9 COMMUNICATING with the LM82There are 13 data registers in the LM82, selected by theCommand Register. At powe

1.0 Functional Description (Continued)2.0 LM82 REGISTERS2.1 COMMAND REGISTERSelects which registers will be read from or written to. Data for this reg

1.0 Functional Description (Continued)2.2 LOCAL and REMOTE TEMPERATURE REGISTERS (LT, and RT)(Read Only Address 00h, and 01h):D7 D6 D5 D4 D3 D2 D1 D0M

3.0 SMBus Timing DiagramsDS101297-10(a) Serial Bus Write to the internal Command Register followed by a the Data ByteDS101297-11(b) Serial Bus Write t

4.0 Application HintsThe LM82 can be applied easily in the same way as otherintegrated-circuit temperature sensors and its remote diodesensing capabil

4.0 Application Hints (Continued)6. Avoid running diode traces close to or parallel to highspeed digital and bus lines. Diode traces should be keptat

Physical Dimensions inches (millimeters) unless otherwise notedLIFE SUPPORT POLICYNATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENT

Connection Diagram Ordering InformationOrderNumberNSPackageNumberTransportMediaLM82CIMQAMQA16A(QSOP-16)95 Units inRailLM82CIMQAXMQA16A(QSOP-16)2500 Un

Pin DescriptionLabel Pin#Function Typical ConnectionNC 1, 5floating, unconnected Left floating. PC board traces may be routedthrough the pads for thes

Absolute Maximum Ratings (Note 1)Supply Voltage −0.3 V to 6.0 VVoltage at SMBData,SMBCLK, T_CRIT_A & INT pins−0.5V to 6VVoltage at Other Pins −0.3

Logic Electrical CharacteristicsDIGITAL DC CHARACTERISTICSUnless otherwise noted, these specifications apply for VCC=+3.0 to 3.6 Vdc. Boldface limits

Logic Electrical Characteristics (Continued)SMBus DIGITAL SWITCHING CHARACTERISTICSUnless otherwise noted, these specifications apply for VCC=+3.0 Vdc

Logic Electrical Characteristics (Continued)Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC el

Logic Electrical Characteristics (Continued)Note 6: Typicals are at TA= 25˚C and represent most likely parametric norm.Note 7: Limits are guaranteed t

1.0 Functional Description (Continued)less than or equal to it’s corresponding HIGH setpoint, asshown inFigure 4.Figure 5shows a simplified logic diag