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TC77-5.0MCTTR 데이터시트(PDF) 10 Page - Microchip Technology |
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TC77-5.0MCTTR 데이터시트(HTML) 10 Page - Microchip Technology |
10 / 22 page TC77 DS20092A-page 10 2002 Microchip Technology Inc. FIGURE 3-2: Temperature Read Timing Diagram - (Reading only the first 13 Bits of the Temperature Register). FIGURE 3-3: Temperature Read Followed By A Write To The Configuration Register Timing. Diagram. It is recommended that the user write all ‘0’s or all ‘1’s to the Configuration register. While the following codes can be transmitted to the TC77, any other code may put the TC77 into a test mode reserved by Microchip for calibration and production verification tests. •00 hex •01 hex •03 hex •07 hex • 0F hex • 1F hex • 3F hex • 7F hex • FF hex The following communication steps can be used to obtain the Manufacturer's ID and put the device into the Continuous Conversion mode. The Manufacturer’s ID register is only accessible for a read operation, if the TC77 is in Shutdown mode. 1. CS goes low to initiate the communication cycle. 2. Read 16 bits of temperature data from the Temperature register. 3. Write 16 bits of data (i.e. XXFF hex) to the Con- figuration register to enter Shutdown mode. 4. Read the 16 bits from the Manufacturer's ID reg- ister (C15:C8 = 54 hex) to verify that the sensor is a Microchip device. 5. Write 8 to 16 bits of data (00 or 0000 hex) to enter Continuous Conversion Mode. 6. Return CS high to terminate the communication cycle. The time between a complete temperature conversion and data transmission is approximately 300 msec. CS CLK SI/O tCS-SCK HI-Z HI-Z TT T 12 11 10 T 9 T 7 T 6 T 5 T 4 T 3 T 2 T 1 T 0 18 13 T 8 CS CLK SI/O tCS-SCK HI-Z 18 8 8 8 1 HI-Z 11 HI-Z TEMPERATURE REGISTER Notes: 1. Bit 2 = 0 during power-up for the first temperature conversion. 2. Bit 2 =1 after the completion of the first tem- perature conversion following power-up or a reset event. 3. Bits 1 and 0 are “DON”T CARES”. CONFIGURATION REGISTER Notes: 1. XX00 = Continuous Conversion Mode 2. XXFF = Shutdown Mode T 12 T 11 T 10 T 9 T 8 T 7 T 6 T 5 T 4 T 3 T 2 T 1 T 0 BIT 2 C 15 C 14 C 13 C 12 C 11 C 10 C 9 C 8 C 7 C 6 C 5 C 4 C 3 C 2 C 1 C 0 |
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