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TC72-5.0MUA Arkusz danych(PDF) 9 Page - Microchip Technology |
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TC72-5.0MUA Arkusz danych(HTML) 9 Page - Microchip Technology |
9 / 24 page 2002 Microchip Technology Inc. DS21743A-page 9 TC72 3.1 Temperature Data Format Temperature data is represented by a 10-bit two’s com- plement word with a resolution of 0.25°C per bit. The temperature data is stored in the Temperature registers in a two’s complement format. The ADC converter is scaled from -128°C to +127°C, but the operating range of the TC72 is specified from -55°C to +125°C. Example: Temperature = 41.5°C MSB Temperature Register= 00101001b =25 + 23 + 20 = 32 + 8 + 1 = 41 LSB Temperature Register = 10000000b = 2-1 = 0.5 TABLE 3-1: TC72 TEMPERATURE OUTPUT DATA TABLE 3-2: TEMPERATURE REGISTER 3.2 Power-Up And Power-Down The TC72 is in the low power consumption shutdown mode at power-up. The Continuous Temperature Con- version mode is selected by performing a Write opera- tion to the Control register, as described in Section 4.0, “Internal Register Structure”. A supply voltage lower than 1.6V (typical) is considered a power-down state for the TC72. If the supply voltage drops below the 1.6V threshold, the internal registers are reset to the power-up default state. 3.3 Serial Bus Interface The serial interface consists of the Chip Enable (CE), Serial Clock (SCK), Serial Data Input (SDI) and Serial Data Output (SDO) signals. The TC72 operates as a slave and is compatible with the SPI bus specifications. The serial interface is designed to be compatible with the Microchip PICmicro® family of microcontrollers. The CE input is used to select the TC72 when multiple devices are connected to the serial clock and data lines. The CE is active-high, and data is written to or read from the device, when CE is equal to a logic high voltage. The SCK input is disabled when CE is low. The rising edge of the CE line initiates a read or write oper- ation, while the falling edge of CE completes a read or write operation. The SCK input is provided by the external microcontrol- ler and is used to synchronize the data on the SDI and SDO lines. The SDI input writes data into the TC72’s Control register, while the SDO outputs the tempera- ture data from the Temperature register and the status of Shutdown bit of the Control register. The TC72 has the capability to function with either an active-high or low SCK input. The SCK inactive state is detected when the CE signal goes high, while the polarity of the clock input (CP) determines whether the data is clocked and shifted on either the rising or falling edge of the system clock, as shown in Figure 3-2. Table 3-3 gives the appropriate clock edge used to transfer data into and out of the registers. Each data bit is transferred at each clock pulse, and the data bits are clocked in groups of eight bits, as shown in Figure 3-3. The address byte is transferred first, followed by the data. A7, the MSb of the address, determines whether a read or write operation will occur. If A7 = ‘0’, one or more read cycles will occur; otherwise, if A7 = ‘1’, one or more write cycles will occur. Data can be transferred either in a single byte or a multi-byte packet, as shown in Figure 3-3. In the 3-byte packet, the data sequence consists of the MSb temper- ature data, LSb temperature data, followed by the Con- trol register data. The multi-byte read feature is initiated by writing the highest address of the desired packet to registers. The TC72 will automatically send the register addressed and all of the lower address registers, as long as the Chip Enable pin is held active. Temperature Binary MSB / LSB Hex +125°C 0111 1101/0000 0000 7D00 +25°C 0001 1001/0000 0000 1900 +0.5°C 0000 0000/1000 0000 0080 +0.25°C 0000 0000/0100 0000 0040 0°C 0000 0000/0000 0000 0000 -0.25°C 1111 1111/1100 0000 FFC0 -25°C 1110 0111/0000 0000 E700 -55°C 1100 1001/0000 0000 C900 D7 D6 D5 D4 D3 D2 D1 D0 Address/ Register Sign 26 25 24 23 23 21 20 02H Temp. MSB 2-1 2-2 000000 01H Temp. LSB |
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