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DS28EA00 Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS28EA00 Datasheet(HTML) 8 Page - Dallas Semiconductor |
8 / 29 page DS28EA00 1-Wire Digital Thermometer with Sequence Detect and PIO 8 of 29 The temperature reading is in °C using a 16-bit sign-extended two’s complement format. Table 1 shows examples of temperature and the corresponding data for 12-bit resolution. With two’s complement, the sign bit is set if the value is negative. If the device is configured for 12-bit resolution, all bits in the LS byte are valid; for a reduced resolution, bit 0 (11 bit mode), bits 0 to 1 (10 bit mode), and bits 0 to 2 (9 bit mode) are undefined. Table 1. Temperature/Data Relationship TEMPERATURE DIGITAL OUTPUT (BINARY) DIGITAL OUTPUT (HEX) +85°C* 0000 0101 0101 0000 0550h +25.0625°C 0000 0001 1001 0001 0191h +10.125°C 0000 0000 1010 0010 00A2h +0.5°C 0000 0000 0000 1000 0008h 0°C 0000 0000 0000 0000 0000h -0.5°C 1111 1111 1111 1000 FFF8h -10.125°C 1111 1111 0101 1110 FF5Eh -25.0625°C 1111 1110 0110 1111 FE6Fh -40°C 1111 1101 1000 0000 FD80h *The power-on reset value of the temperature readout register is +85°C. Temperature Alarm Registers ADDR bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 2 S 2 6 2 5 2 4 2 3 2 2 2 1 2 0 High Alarm (TH) 3 S 2 6 2 5 2 4 2 3 2 2 2 1 2 0 Low Alarm (TL) The result of a temperature conversion is automatically compared to the values in the alarm registers to determine whether an alarm condition exists. Alarm thresholds are represented as two’s complement number. With 8 bits available for sign and value, alarm thresholds can be set in increments of 1°C. An alarm condition exists if a temperature conversion results in a value that is either higher than or equal to the value stored in the TH register or lower than or equal to the value stored in the TL register. If a temperature alarm condition exists, the device will respond to the Conditional Search command. The alarm condition is cleared if a subsequent temperature conversion results in a temperature reading within the boundaries defined by the data in the TH and TL registers. Configuration Register ADDR b7 b6 b5 b4 b3 b2 b1 b0 4 0 R1 R0 1 1 1 1 1 The functional assignments of the individual bits are explained in the table below. Bits 0 to 4 and bit 7 have no function; they cannot be changed by the user. As a factory default, the device operates in 12-bit resolution. BIT DESCRIPTION BIT(S) DEFINITION R0, R1: Temperature Converter Resolution b5, b6 These bits control the resolution of the temperature converter. The codes are as follows: R1 R0 0 0 9 bits 0 1 10 bits 1 0 11 bits 1 1 12 bits |
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