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TC773.3MCTTR 데이터시트(PDF) 11 Page - Microchip Technology |
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TC773.3MCTTR 데이터시트(HTML) 11 Page - Microchip Technology |
11 / 22 page 2002 Microchip Technology Inc. DS20092A-page 11 TC77 4.0 INTERNAL REGISTER STRUCTURE The TC77 Internal register structure consists of three registers. The Temperature and Manufacturer’s Identi- fication registers are read only, while the Configuration register is write only. TABLE 4-1: REGISTERS FOR TC77 4.1 Configuration Register (CONFIG) The Configuration register is write only. This register selects either Shutdown, Continuous Conversion or Test modes: • C15:C0 = XXXX/XXXX 1111/1111 (Shutdown mode) • C15:C0 = XXXX/XXXX 0000/0000 (Continuous Conversion mode) • The TC77 is in Shutdown mode when bits C0 to C7 are all equal to ‘1’s. The TC77 will be in the Continuous Conversion mode if a ‘0’ in any bit location from C0 to C7 is written to the Configura- tion register. The TC77 is in the Continuous Conversion mode at power-up. It is recommended that the user write all ‘0’s or all ‘1’s to the Configuration register because other bit codes may put the TC77 in a test mode used for calibration and production verification tests. Section 3.3 lists the Configuration register bit codes that can be written to the TC77 without having the device enter a production test mode. During Shutdown mode, the serial bus is still active. The current consumption of the TC77 will be less than 1 µA during the time between serial communication. 4.2 Temperature Register (TEMP) The Temperature register is read only and holds the temperature conversion data. Bits 0 and 1 are unde- fined and will be tri-state outputs during a read sequence. Bit 2 is set to a logic ‘1’ after completion of the first temperature conversion following a power-up or reset event. Bit 2 is set to a logic ‘0’ during the time needed to complete the first temperature conversion. Therefore, the status of bit 2 can be monitored to indi- cate that the TC77 has completed the first temperature conversion. Bits 15:3 contain the 13 bit two’s comple- ment data from the temperature conversion. 4.3 Manufacturer’s ID Register (M_ID) The Manufacturer’s Identification code is contained in this read only register. The Manufacturer ID register is only available for a read operation when the TC77 is in Shutdown mode. The Manufacturer’s ID code is con- tained in bits 15:8 and is equal to 54 hex to indicate a Microchip device. Bits 1:0 are undefined and will be tri- state outputs during a read sequence, while bits 7:2 are set to ‘0’. Name Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value at Powerup/Reset CONFIG C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 XXXX/XXXX 0000/0000 TEMP T12 T11 T10T9 T8 T7 T6 T5T4T3 T2T1 T0 * x x 1111/1111 0000/0*XX M_ID 0 1 0 1 0 1 00 000 000x x 0101/0100 0000/00XX * Bit 2 = 0 during power-up; otherwise, bit 2 =1 |
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