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TMP421AIDCNR Folha de dados(PDF) 11 Page - Texas Instruments |
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TMP421AIDCNR Folha de dados(HTML) 11 Page - Texas Instruments |
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11 / 30 page  www.ti.com Standard Decimal to Binary Temperature Data REGISTER INFORMATION POINTER REGISTER Standard Binary to Decimal Temperature Data One-ShotStartRegister ConfigurationRegisters StatusRegister IdentificationRegisters N-FactorCorrectionRegisters ConversionRateRegister LocalandRemoteTemperatureRegisters SDA SCL PointerRegister I/O Control Interface SoftwareReset TMP421 TMP422 TMP423 SBOS398B – JULY 2007 – REVISED MARCH 2008 Both local and remote temperature data use two Calculation Example bytes for data storage. The high byte stores the temperature with 1 °C resolution. The second or low For positive temperatures (for example, +20 °C): byte stores the decimal fraction value of the (+20 °C)/(+1°C/count) = 20 → 14h → 0001 0100 temperature and allows a higher measurement Convert the number to binary code with 8-bit, resolution, as shown in Table 2. The measurement right-justified format, and MSB = '0' to denote a resolution for the both the local and remote channels positive sign. is 0.0625 °C, and is not adjustable. +20 °C is stored as 0001 0100 → 14h. Table 2. Decimal Fraction Temperature Data For negative temperatures (for example, –20 °C): Format (Local and Remote Temperature Low (|–20|)/(+1 °C/count) = 20 → 14h → 0001 0100 Bytes) Generate the two's complement of a negative TEMPERATURE REGISTER LOW BYTE VALUE (0.0625 °C RESOLUTION) number by complementing the absolute value TEMP ( °C) STANDARD AND EXTENDED BINARY HEX binary number and adding 1. 0 0000 0000 00 –20 °C is stored as 1110 1100 → ECh. 0.0625 0001 0000 10 0.1250 0010 0000 20 0.1875 0011 0000 30 The TMP421/22/23 contain multiple registers for 0.2500 0100 0000 40 holding configuration information, temperature 0.3125 0101 0000 50 measurement results, and status information. These 0.3750 0110 0000 60 registers are described in Figure 14 and Table 3. 0.4375 0111 0000 70 0.5000 1000 0000 80 0.5625 1001 0000 90 Figure 14 shows the internal register structure of the 0.6250 1010 0000 A0 TMP421/22/23. The 8-bit Pointer Register is used to 0.6875 1011 0000 B0 address a given data register. The Pointer Register 0.7500 1100 0000 C0 identifies which of the data registers should respond to a read or write command on the two-wire bus. This 0.8125 1101 0000 D0 register is set with every write command. A write 0.8750 1110 0000 E0 command must be issued to set the proper value in 0.9385 1111 0000 F0 the Pointer Register before executing a read (1) Resolution is 0.0625 °C/count. All possible values are shown. command. Table 3 describes the pointer address of the TMP421/22/23 registers. The power-on reset (POR) value of the Pointer Register is 00h (0000 Calculation Example 0000b). High byte conversion (for example, 0111 0011): Convert the right-justified binary high byte to hexadecimal. From hexadecimal, multiply the first number by 160 = 1 and the second number by 161 = 16. The sum equals the decimal equivalent. 0111 0011b → 73h → (3 × 160) + (7 × 161) = 115 Low byte conversion (for example, 0111 0000): To convert the left-justified binary low-byte to decimal, use bits 7 through 4 and ignore bits 3 through 0 because they do not affect the value of the number. 0111b → (0 × 1/2)1 + (1 × 1/2)2 + (1 × 1/2)3 + (1 × 1/2)4 = 0.4375 Figure 14. Internal Register Structure Note that the final numerical result is the sum of the high byte and low byte. In negative temperatures, the unsigned low byte adds to the negative high byte to result in a value less than the high byte (for instance, –15 + 0.75 = –14.25, not –15.75). Copyright © 2007–2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TMP421 TMP422 TMP423 |
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