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MC74 Datenblatt(PDF) 7 Page - ON Semiconductor |
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MC74 Datenblatt(HTML) 7 Page - ON Semiconductor |
7 / 12 page MC74 http://onsemi.com 7 REGISTER SET and PROGRAMMER’S MODEL MC74 Command Set (SMBus READ_BYTE and WRITE_BYTE) Command Byte Description Command Code Function RTR 00h Read Temperature (TEMP) RWCR 01h Read/Write Configuration (CONFIG) Configuration Register (CONFIG), 8–BITS, READ/WRITE Configuration Register (Config) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] SHDN Data Rdy Reserved 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 — Al- ways returns zero when read. N/A N/A *DATA_RDY bit reset at power–up and SHDN enable (see below). Figure 3. . DATA_RDY, SHDN Operation Logic Diagram V DD t conv t conv DATA_RDY SHDN Temperature Register (TEMP), 8–Bits, READ–ONLY The binary value (2’s complement format) in this register represents temperature of the integrated sensor following a conversion cycle. The registers are automatically updated in an alternating manner. Temperature Register (TEMP) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB x x x x x x LSB In the temperature data registers, each unit value represents 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 the following table. Temperature–to–Digital Value Conversion (TEMP) ACTUAL TEMPERATURE REGISTERED TEMPERATURE BINARY HEX +130.00 °C +127 °C 0111 1111 +127.00 °C +127 °C 0111 1111 +126.50 °C +127 °C 0111 1111 +25.25 °C +25 °C 0001 1001 +0.50 °C +1 °C 0000 0001 +0.25 °C 0 °C 0000 0000 0.00 °C 0 °C 0000 0000 -0.25 °C 0 °C 0000 0000 -0.50 °C 0 °C 0000 0000 -0.75 °C -1 °C 1111 1111 -1.00 °C -1 °C 1111 1111 -25.00 °C -25 °C 1110 0111 -25.25 °C -25 °C 1110 0110 -54.75 °C -55 °C 1100 1001 -55.00 °C -55 °C 1100 1001 -65.00 °C -65 °C 1011 1111 Register Set Summary The MC74’s register set is summarized below. All registers are 8–bits wide. Name Description POR State Read Write TEMP Internal sensor temperature (2’s complement) 0000 0000b* √ CONFIG CONFIG register 0000 0000b √ √ *NOTE: The TEMP register immediately will be updated by the A/D converter after the DATA_RDY bit goes high. |
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