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21462C Datasheet(PDF) 8 Page - Microchip Technology |
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21462C Datasheet(HTML) 8 Page - Microchip Technology |
8 / 16 page TC74 DS21462C-page 8 2002 Microchip Technology Inc. 4.0 REGISTER SET AND PROGRAMMER’S MODEL TABLE 4-1: COMMAND BYTE DESCRIPTION (SMBUS/I2C READ_BYTE AND WRITE_BYTE) TABLE 4-2: CONFIGURATION REGISTER (CONFIG); 8 BITS, READ/ WRITE) FIGURE 4-1: DATA_RDY, SHDN Operation Logic Diagram. 4.1 Temperature Register (TEMP), 8 Bits, READ ONLY The binary value (2’s complement format) in this regis- ter represents temperature of the onboard sensor following a conversion cycle. The registers are automatically updated in an alternating manner. TABLE 4-3: TEMPERATURE REGISTER (TEMP) In temperature data registers, each unit value repre- sents one degree (Celsius). The value is in 2’s complement binary format such that a reading of 0000 0000b corresponds to 0°C. Examples of this temperature to binary value relationship are shown in Table 4-4 . TABLE 4-4: TEMPERATURE-TO-DIGITAL VALUE CONVERSION (TEMP) 4.2 Register Set Summary The TC74 register set is summarized in Table 4-5. All registers are 8 bits wide. TABLE 4-5: TC74 REGISTER SET SUMMARY Command Code Function RTR 00h Read Temperature (TEMP) RWCR 01h Read/Write Configuration (CONFIG) Bit POR Function Type Operation D[7] 0 STANDBY Switch Read/ Write 1 = standby, 0 = normal D[6] 0 Data Ready * Read Only 1 = ready 0 = not ready D[5]- D[0] 0 Reserved - Always returns zero when read N/A N/A Note 1: *DATA_RDY bit RESET at power-up and SHDN enable. VDD DATA_RDY SHDN tconv tconv D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB X X X X X X LSB Actual Temperature Registered Temperature Binary Hex +130.00°C +127°C 0111 1111 +127.00°C +127°C 0111 1111 +126.50°C +126°C 0111 1110 +25.25°C +25°C 0001 1001 +0.50°C 0°C 0000 0000 +0.25°C 0°C 0000 0000 0.00°C 0°C 0000 0000 -0.25°C -1°C 1111 1111 -0.50°C -1°C 1111 1111 -0.75°C -1°C 1111 1111 -1.00°C -1°C 1111 1111 -25.00°C -25°C 1110 0111 -25.25°C -26°C 1110 0110 -54.75°C -55°C 1100 1001 -55.00°C -55°C 1100 1001 -65.00°C -65°C 1011 1111 Name Description POR State Read Write TEMP Internal Sensor Temperature (2’s Complement) 0000 0000 b (1) √ N/A CONFIG CONFIG Register 0000 0000 b √√ Note 1: The TEMP register will be immediately updated by the A/D converter after the DATA_RDY Bit goes high. |
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