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LM77CIM-3 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM77CIM-3 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 17 page 1.0 Functional Description (Continued) terrupts just after reprogramming setpoints. Typically, sys- tem Interrupt inputs are masked prior to reprogramming trip points. By doing a read just after resetting trip points, but prior to unmasking, unexpected Interrupts are prevented. Avoid programming setpoints so close that their hysteresis values overlap. An example would be that with a T HYST value of 2˚C then setting T HIGH and TLOW to within 4˚C of each other will violate this restriction. To be more specific, with T HYST set to 2˚C assume T HIGH set to 64˚C. If TLOW is set equal to, or higher than 60˚C this restriction is violated. 1.2 DEFAULT SETTINGS The LM77 always powers up in a known state. LM77 power up default conditions are: 1. Comparator Interrupt Mode 2. T LOW set to 10˚C 3. T HIGH set to 64˚C 4. T_CRIT set to 80˚C 5. T HYST set to 2˚C 6. INT and T_CRIT_A active low 7. Pointer set to “00”; Temperature Register The LM77 registers will always reset to these default values when the power supply voltage is brought up from zero volts as the supply crosses the voltage level plotted in the follow- ing curve. The LM77 registers will reset again when the power supply drops below the voltage plotted in this curve. 1.3 SERIAL BUS INTERFACE The LM77 operates as a slave on the Serial Bus, so the SCL line is an input (no clock is generated by the LM77) and the SDA line is a bi-directional serial data line. According to Serial Bus specifications, the LM77 has a 7-bit slave ad- dress. The five most significant bits of the slave address are hard wired inside the LM77 and are “10010”. The two least significant bits of the address are assigned to pins A1–A0, and are set by connecting these pins to ground for a low, (0); or to +V S for a high, (1). Therefore, the complete slave address is: 10010 A1 A0 MSB LSB Average Power on Reset Voltage vs Temperature DS100136-18 www.national.com 8 |
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