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DS9093F Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS9093F Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 22 page DS1920 5 of 22 The most significant (sign) bit is duplicated into all of the bits in the upper MSB of the 2-byte temperature register in memory. This “sign-extension” yields the 16-bit temperature readings as shown in Table 1. Higher resolutions may be obtained by the following procedure. First, read the temperature, and truncate the 0.5°C bit (the LSB) from the read value. This value is TEMP_READ. The value left in the counter may then be read. This value is the count remaining (COUNT_REMAIN) after the gate period has ceased. The last value needed is the number of counts per degree C (COUNT_PER_C) at that temperature. The actual temperature may be then be calculated by the user using the following formula: TEMPERATURE = TEMP_READ - 0.25 + C COUNT_PER_ IN) COUNT_REMA - _C (COUNT_PER TEMPERATURE MEASURING CIRCUITRY Figure 3 TEMPERATURE/DATA RELATIONSHIPS Table 1 TEMPERATURE DIGITAL OUTPUT (BINARY) DIGITAL OUTPUT (HEX) +100 °C 00000000 11001000 00C8H +25 °C 00000000 00110010 0032H +½ °C 00000000 00000001 0001H +0 °C 00000000 00000000 0000H -½ °C 11111111 11111111 FFFFH -25 °C 11111111 11001110 FFCEH -55 °C 11111111 10010010 FF92H SET/CLEAR LSB |
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