DS1620 Maxim Integrated Products, DS1620 Datasheet
DS1620
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DS1620 Summary of contents
Page 1
... DESCRIPTION The DS1620 Digital Thermometer and Thermostat provides 9–bit temperature readings which indicate the temperature of the device. With three thermal alarm outputs, the DS1620 can also act as a thermostat driven high if the DS1620’s temperature is greater than or equal to a user–defined temperature HIGH TH ...
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... DQ Data Input/Output pin for 3-wire communication port. 2 Clock input pin for 3-wire communication port. When the DS1620 is used in a CLK/ CONV stand-alone application with no 3–wire port, this pin can be used as a convert pin. Temperature conversion will begin on the falling edge of 3 Reset input pin for 3-wire communication port ...
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... DS1620 as either a 9–bit word (taking words, with the most significant 7 bits being ignored or set illustrated in Table 3. After the MSB, the DS1620 will output 0s. Note that temperature is represented in the DS1620 in terms of a ½°C LSB, yielding the 9–bit format shown in Figure 2. TEMPERATURE, TH, and TL REGISTER FORMAT Figure 2 ...
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... OPERATION–THERMOSTAT CONTROLS Three thermally triggered outputs thermostat, as shown in Figure 3. When the DS1620’s temperature meets or exceeds the value stored in the high temperature trip register, the output T DS1620’s measured temperature becomes less than the stored value in the high temperature register, TH. ...
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... NVB = Nonvolatile Memory Busy Flag. 1=write memory is not busy. A copy to E CPU = CPU Use Bit. If CPU=0, the CLK/ low. If CPU is 1, the DS1620 will be used with a CPU communicating to it over the 3–wire port, and the operation of the CLK/ CONV 2 nonvolatile E memory, capable of at least 50,000 writes. The DS1620 is shipped with CPU=0. ...
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... For data inputs, the data must be valid during the rising edge of a clock cycle. Data bits are output on the falling edge of the clock and remain valid through the rising edge. When reading data from the DS1620, the DQ pin goes to a high-impedance state while the clock is high. Taking ...
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... This command stops temperature conversion. No further data is required. This command may be used to halt a DS1620 in continuous conversion mode. After issuing this command the current temperature measurement will be completed and then the DS1620 will remain idle until a Start Convert T is issued to resume continuous operation. ...
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... DS1620 COMMAND SET Table 4 INSTRUCTION DESCRIPTION TEMPERATURE CONVERSION COMMANDS Read Temperature Reads last converted temperature value from temperature register. Read Counter Reads value of count remaining from counter. Read Slope Reads value of the slope accumulator. Start Convert T Initiates temperature conversion. Stop Convert T Halts temperature conversion ...
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... FUNCTION EXAMPLE Example: CPU sets up DS1620 for continuous conversion and thermostatic function. DS1620 MODE CPU MODE (3-WIRE READ DATA TRANSFER Figure 4 DATA (LSB FIRST) 0Ch CPU issues Write Config command 00h CPU sets DS1620 up for continuous conversion CPU issues Reset to DS1620 ...
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WRITE DATA TRANSFER Figure 5 NOTE and t apply to both read and write data transfer ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature ...
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DC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Thermometer Error Thermometer Resolution Logic 0 Output Logic 1 Output Input Resistance Active Supply Current Standby Supply Current Input Current on Each Pin Thermal Drift SINGLE CONVERT TIMING DIAGRAM (STAND-ALONE MODE) CONV AC ELECTRICAL CHARACTERISTICS ...
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AC ELECTRICAL CHARACTERISTICS PARAMETER Input Capacitance I/O Capacitance EEPROM AC ELECTRICAL CHARACTERISTICS PARAMETER EEPROM Write Cycle Time EEPROM Writes EEPROM Data Retention NOTES: 1. All voltages are referenced to ground. 2. Valid for design revisions D1 and above. The supply ...