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LM73CIMKX-0 Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM73CIMKX-0 Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 18 page 1.0 Functional Description (Continued) 13-bit (12-bit plus sign) Temperature Digital Output Binary Hex +150˚C 0100 1011 0000 0000 4B00h +25˚C 0000 1100 1000 0000 0C80h +1˚C 0000 0000 1000 0000 0080h +0.0625˚C 0000 0000 0000 1000 0008h 0˚C 0000 0000 0000 0000 0000h −0.0625˚C 1111 1111 1111 1000 FFF8h −1˚C 1111 1111 1000 0000 FF80h −25˚C 1111 0011 1000 0000 F380h −40˚C 1110 1100 0000 0000 EC00h 14-bit (13-bit plus sign) Temperature Digital Output Binary Hex +150˚C 0100 1011 0000 0000 4B00h +25˚C 0000 1100 1000 0000 0C80h +1˚C 0000 0000 1000 0000 0080h +0.03125˚C 0000 0000 0000 0100 0004h 0˚C 0000 0000 0000 0000 0000h −0.03125˚C 1111 1111 1111 1100 FFFCh −1˚C 1111 1111 1000 0000 FF80h −25˚C 1111 0011 1000 0000 F380h −40˚C 1110 1100 0000 0000 EC00h 1.4 SMBus INTERFACE The LM73 operates as a slave on the SMBus. The SMBDAT line is bidirectional. The SMBCLK line is is an input only. The LM73 never drives the SMBCLK line and it does not support clock stretching. The LM73 uses a 7-bit slave address. It is available in two versions. Each version can be configured for one of three unique slave addresses, for a total of six unique address. Part Number Address Pin Device Address LM73-0 Float Ground V DD 1001 000 1001 001 1001 010 LM73-1 Float Ground V DD 1001 100 1001 101 1001 110 The SMBDAT output is an open-drain output and does not have internal pull-ups. A “high” level will not be observed on this pin until pull-up current is provided by some external source, typically a pull-up resistor. Choice of resistor value depends on many system factors but, in general, the pull-up resistor should be as large as possible without effecting the SMBus desired data rate. This will minimize any internal temperature reading errors due to internal heating of the LM73. The LM73 features an integrated low-pass filter on both the SMBCLK and the SMBDAT line. These filters increase com- munications reliability in noisy environments. If either the SMBCLK or SMBDAT line is held low for a time greater than t TIMEOUT (see Logic Electrical Characteristics for the value of t TIMEOUT), the LM73 state machine will reset to the SMBus idle state, releasing the data line. Once the SMBDAT is released high, the master may initiate an SMBus start. 1.5 ALERT FUNCTION The ALERT output is an over-temperature indicator. At the end of every temperature conversion, the measured tem- perature is compared to the value in the T HIGH Register. If the measured temperature exceeds the value stored in T HIGH, the ALERT output goes active (see Figure Figure 1). This over-temperature condition will also cause the ALRT- _STAT bit in the Control/Status Register to change value (this bit mirrors the logic level of the ALERT pin). The ALERT pin and the ALRT_STAT bit are cleared when any of the following occur: 1. The measured temperature falls below the value stored in the T LOW Register 2. A "1" is written to the ALERT Reset bit in the Configura- tion Register 3. The master resets it through an SMBus Alert Response Address (ARA) procedure If ALERT has been cleared by the master writing a "1" to the ALERT Reset bit, while the measured temperature still ex- ceeds the T HIGH setpoint, ALERT will go active again after the completion of the next temperature conversion. Each temperature reading is associated with a Temperature High (THI) and a Temperature Low (TLOW) flag in the Control/Status Register. A digital comparison determines whether that reading is above the T HIGH setpoint or below the T LOW setpoint. If so, the corresponding flag is set. All digital comparisons to the T HIGH, and TLOW values are based on an 11-bit temperature comparison. Regardless of the resolution setting of the LM73, the lower three temperature LSBs will not affect the state of the ALERT output, THI flag, and TLOW flag. www.national.com 9 |
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