DS1620S Maxim Integrated Products, DS1620S Datasheet - Page 3
![IC THERMOMETER/STAT DIG 8-SOIC](/photos/6/58/65843/8-soic_21-0262_sml.jpg)
DS1620S
Manufacturer Part Number
DS1620S
Description
IC THERMOMETER/STAT DIG 8-SOIC
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1620.pdf
(12 pages)
Specifications of DS1620S
Function
Thermometer, Thermostat
Topology
Comparator, Register Bank
Sensor Type
Internal
Sensing Temperature
-55°C ~ 125°C
Output Type
Digital
Output Alarm
Yes
Output Fan
No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
Full Temp Accuracy
+/- 2 C
Digital Output - Bus Interface
Serial (3-Wire)
Digital Output - Number Of Bits
9 bit
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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DS1620
DS1620 FUNCTIONAL BLOCK DIAGRAM Figure 1
The DS1620 measures temperature using a bandgap-based temperature sensor. The temperature reading
is provided in a 9–bit, two’s complement reading by issuing a READ TEMPERATURE command. The
data is transmitted serially through the 3–wire serial interface, LSB first. The DS1620 can measure
temperature over the range of -55°C to +125°C in 0.5°C increments. For Fahrenheit usage, a lookup table
or conversion factor must be used.
Since data is transmitted over the 3–wire bus LSB first, temperature data can be written to/read from the
th
DS1620 as either a 9–bit word (taking
low after the 9
(MSB) bit), or as two transfers of 8–bit
RST
words, with the most significant 7 bits being ignored or set to 0, as 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
MSB
LSB
X
X
X
X
X
X
X
1
1
1
0
0
1
1
1
0
T = -25°C
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