DS1624 Maxim Integrated Products, DS1624 Datasheet - Page 6
![IC THERM/EEPROM DIG 256BYTE 8DIP](/photos/1/39/13900/175-8-dip_sml.jpg)
DS1624
Manufacturer Part Number
DS1624
Description
IC THERM/EEPROM DIG 256BYTE 8DIP
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1624S.pdf
(17 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS1624
Manufacturer:
DALLAS
Quantity:
5 510
Company:
Part Number:
DS1624+
Manufacturer:
MAXIM
Quantity:
2 000
Company:
Part Number:
DS16245
Manufacturer:
DALLAS
Quantity:
5 510
Company:
Part Number:
DS16245
Manufacturer:
SIEMENS
Quantity:
5 510
Part Number:
DS1624S
Manufacturer:
DALLAS
Quantity:
20 000
Part Number:
DS1624S+
Manufacturer:
MAIXM
Quantity:
20 000
Part Number:
DS1624S+TR
Manufacturer:
MAXIM/美信
Quantity:
20 000
DS1624
OPERATION-MEASURING TEMPERATURE
A block diagram of the DS1624 is shown in Figure 1. The DS1624 measures temperatures through the
use of an on–board proprietary temperature measurement technique. A block diagram of the temperature
measurement circuitry is shown in Figure 4.
The DS1624 measures temperature by counting the number of clock cycles that an oscillator with a low
temperature coefficient goes through during a gate period determined by a high temperature coefficient
oscillator. The counter is preset with a base count that corresponds to –55°C. If the counter reaches zero
before the gate period is over the temperature register, which is also preset to the –55°C value, is
incremented indicating that the temperature is higher than –55°C.
At the same time, the counter is preset with a value determined by the slope accumulator circuitry. This
circuitry is needed to compensate for the parabolic behavior of the oscillators over temperature. The
counter is then clocked again until it reaches zero. If the gate period is still not finished, then this process
repeats.
The slope accumulator is used to compensate for the nonlinear behavior of the oscillators over
temperature, yielding a high resolution temperature measurement. This is done by changing the number
of counts necessary for the counter to go through for each incremental degree in temperature. To obtain
the desired resolution, both the value of the counter and the number of counts per °C (the value of the
slope accumulator) at a given temperature must be known.
6 of 17