Rainbow-electronics LM99 Manual de usuario

LM99±1˚C Accurate, High Temperature, Remote DiodeTemperature Sensor with Two-Wire InterfaceGeneral DescriptionThe LM99 is an 11-bit remote diode tempe

1.0 Functional Description (Continued)Remote temperature data is represented by an 11-bit, two’scomplement word with an LSB (Least Significant Bit) eq

1.0 Functional Description (Continued)1.9 COMMUNICATING WITH THE LM99The data registers in the LM99 are selected by the Com-mand Register. At power-up

1.0 Functional Description (Continued)1.9.1 SMBus Timing DiagramsLM99 Timing Diagram1.10 SERIAL INTERFACE RESETIn the event that the SMBus Master is R

1.0 Functional Description (Continued)1.11 DIGITAL FILTERD2 D1 Filter0 0 No Filter0 1 Level 11 0 Level 11 1 Level 2In order to suppress erroneous remo

1.0 Functional Description (Continued)1.12 FAULT QUEUEIn order to suppress erroneous ALERT or T_CRIT triggeringthe LM99 incorporates a Fault Queue. Th

2.0 LM99 Registers (Continued)Command Select Address Power On Default State RegisterNameRegister FunctionRead Address<P7:P0>hexWrite Address<

2.0 LM99 Registers (Continued)2.4 CONFIGURATION REGISTER(Read Address 03h / Write Address 09h):D7 D6 D5 D4 D3 D2 D1 D0ALERT maskRUN/STOP 0Remote T_CRI

2.0 LM99 Registers (Continued)2.8 REMOTE TEMPERATURE OFFSET REGISTERS (RTOHB and RTOLB)(Read / Write Address 11h):BIT D7 D6 D5 D4 D3 D2 D1 D0Value SIG

3.0 Application HintsThe LM99 can be applied easily in the same way as otherintegrated-circuit temperature sensors, and its remote diodesensing capabi

3.0 Application Hints (Continued)3.2 PCB LAYOUT FOR MINIMIZING NOISEIn a noisy environment, such as a processor mother board,layout considerations are

Connection DiagramMSOP-820053802TOP VIEWOrdering InformationPart NumberPackageMarkingNS PackageNumberTransportMediaLM99CIMM T17CMUA08A(MSOP-8)1000 Uni

Physical Dimensions inches (millimeters) unless otherwise noted8-Lead Molded Mini-Small-Outline Package (MSOP),JEDEC Registration Number MO-187Order N

Typical Application20053803LM99www.national.com3

Absolute Maximum Ratings (Note 1)Supply Voltage −0.3 V to 6.0 VVoltage at SMBData, SMBCLK,ALERT, T_CRIT_A−0.5 V to 6.0 VVoltage at Other Pins −0.3 V t

Logic Electrical CharacteristicsDIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for VDD= +3.0 to 3.6 Vdc. Boldfacelimits

SMBus Communication20053840Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specific

1.0 Functional DescriptionThe LM99 temperature sensor incorporates a delta VBEbased temperature sensor using a Local or Remote diodeand a 10-bit plus

1.0 Functional Description (Continued)1.2.2 ALERT Output as an InterruptThe LM99’s ALERT output can be implemented as a simpleinterrupt signal when it

1.0 Functional Description (Continued)1. Master Senses SMBus alert line low2. Master sends a START followed by the Alert ResponseAddress (ARA) with a