DS1624 Maxim Integrated Products, DS1624 Datasheet - Page 7

• Manufacturer Part Number: DS1624
• Description: IC THERM/EEPROM DIG 256BYTE 8DIP
• Manufacturer: Maxim Integrated Products

Specifications of DS1624

• Function: Thermometer, Thermostat
• Topology: EEPROM, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: 2-Wire Serial
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Full Temp Accuracy: +/- 0.5 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 13 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TEMPERATURE MEASURING CIRCUITRY Figure 4
Internally, this calculation is performed by the DS1624 to provide 0.03125°C resolution. The temperature
reading is provided in a 13–bit, two’s complement reading by issuing READ TEMPERATURE
command. Table 2 describes the exact relationship of output data to measured temperature. The data is
transmitted serially through the 2–wire serial interface, MSB first. The DS1624 can measure temperature
over the range of -55°C to +125°C in 0.03125°C increments. For Fahrenheit usage a lookup table or
conversion factor must be used.
TEMPERATURE/DATA RELATIONSHIPS Table 2
Since data is transmitted over the 2–wire bus MSB first, temperature data may be written to/read from the
DS1624 as either a single byte (with temperature resolution of 1°C) or as two bytes, the second byte
containing the value of the 5 least significant bits of the temperature reading as shown in Table 1. Note
that the remaining three bits of this byte are set to all 0’s.
+25.0625˚C
-25.0625˚C
+125˚C
TEMP
+½˚C
-55˚C
+0˚C
-½˚C
COEFFICIENT OSCILLATOR
COEFFICIENT OSCILLATOR
LOW TEMPERATURE
PRESET
HIGH TEMPERATURE
DIGITAL OUTPUT
01111101 00000000
00011001 00010000
00000000 10000000
00000000 00000000
11111111 10000000
11100110 11110000
11001001 00000000
(Binary)
SLOPE ACCUMULATOR
DIGITAL OUTPUT
COUNTER
COUNTER
7 of 17
7D00h
E6F0h
C900h
FF80h
1910h
0080h
0070h
(Hex)
=0
=0
INC
STOP
PRESET
TEMPERATURE REGISTER
COMPARE
SET/CLEAR
LSB
DS1624