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MIC281-5BM6 Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC281-5BM6 Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 12 page November 2004 7 MIC281 MIC281 Micrel Slave Address The MIC281 will only respond to its own unique slave ad- dress. A match between the MIC281’s address and the address specified in the serial bit stream must be made to initiate communication. The MIC281’s slave address is fixed at the time of manufacture. Eight different slave addresses are available as determined by the part number. See Table 2 below and the Ordering Information table. Part Number Slave Address MIC281-0BM6 1001 000xb = 90h MIC281-1BM6 1001 001xb = 92h MIC281-2BM6 1001 010xb = 94h MIC281-3BM6 1001 011xb = 96h MIC281-4BM6 1001 100xb = 98h MIC281-5BM6 1001 101xb = 9Ah MIC281-6BM6 1001 110xb = 9Ch MIC281-7BM6 1001 111xb = 9Eh Table 2. MIC281 Slave Addresses Temperature Data Format Theleast-significantbitofthetemperatureregisterrepresents one degree Centigrade. The values are in a two’s comple- ment format, wherein the most significant bit (D7) represents the sign: zero for positive temperatures and one for negative temperatures. Table 3 shows examples of the data format used by the MIC281 for temperatures. Temperature Binary Hex +127°C 0111 1111 7F +125°C 0111 1101 7D +25°C 0001 1001 19 +1°C 0000 0001 01 0°C 0000 0000 00 –1°C 1111 1111 FF –25°C 1110 0111 E7 –125°C 1000 0011 83 –128°C 1000 0000 80 Table 3. Digital Temperature Format Diode Faults The MIC281 is designed to respond in a failsafe manner to diode faults. If an internal or external fault occurs in the tem- perature sensing circuitry, such as T1 being open or shorted to VDD or GND, the temperature result will be reported as the maximum full-scale value, +127°C. Note that diode faults will notbedetecteduntilthefirstA/Dconversioncycleiscompleted following power-up or exiting shutdown mode. Shutdown Mode Setting the shutdown bit in the configuration register will cause the MIC281 to cease operation. The A/D converter will stop and power consumption will drop to the ISHDN level. No registers will be affected by entering shutdown mode. The last temperature reading will persist in the TEMP register. |
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