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LM74CITPX-5 データシート(PDF) 10 Page - National Semiconductor (TI) |
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LM74CITPX-5 データシート(HTML) 10 Page - National Semiconductor (TI) |
10 / 15 page 1.0 Functional Description (Continued) 1.5 INTERNAL REGISTER STRUCTURE The LM74 has three registers, the temperature register, the configuration register and the manufacturer’s/device identifi- cation register. The temperature and manufacturer’s/device identification registers are read only. The configuration reg- ister is write only. 1.5.1 Configuration Register (Selects shutdown or continuous conversion modes): (Write Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X XXXXXXX Shutdown D0–D15 set to XX FF hex enables shutdown mode. D0–D15 set to 00 00 hex sets Continuous conversion mode. Note: setting D0-D15 to any other values may place the LM74 into a manufacturer’s test mode, upon which the LM74 will stop responding as described. These test modes are to be used for National Semiconductor production testing only. See Section 1.2 Serial Bus Interface for a complete discussion. 1.5.2 Temperature Register (after power-up, before first complete temperature conversion) (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 1111111000000 X X D0–D1: Undefined. TRI-STATE will be output on SI/0. D2–D15: Power-on Reset (POR) values. 1.5.3 Temperature Register (after completion of first temperature conversion) (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 MSB Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 LSB 1 X X D0–D1: Undefined. TRI-STATE will be output on SI/0. D2: High. D3–D15: Temperature Data. One LSB = 0.0625˚C. Two’s complement format. 1.5.4 Manufacturer’s Device ID Register (Read Only): D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 0000000000000 X X D0–D1: Undefined. TRI-STATE will be output on SI/0. D2–D15: Manufacturer’s/Device ID Data. This register is accessed whenever the LM74 is in shutdown mode. www.national.com 10 |
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