DS1620S Maxim Integrated Products, DS1620S Datasheet - Page 4

• Manufacturer Part Number: DS1620S
• Description: IC THERMOMETER/STAT DIG 8-SOIC
• Manufacturer: Maxim Integrated Products

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

Table 3 describes the exact relationship of output data to measured temperature.
.
TEMPERATURE/DATA RELATIONSHIPS Table 3
Higher resolutions may be obtained by reading the temperature, and truncating the 0.5°C bit (the LSB)
from the read value. This value is TEMP_READ. The value left in the counter may then be read by
issuing a READ COUNTER command. This value is the count remaining (COUNT_REMAIN) after the
gate period has ceased. By loading the value of the slope accumulator into the count register (using the
READ SLOPE command), this value may then be read, yielding the number of counts per degree C
(COUNT_PER_C) at that temperature. The actual temperature may be then be calculated by the user
using the following:
TEMPERATURE=TEMP_READ-0.25 +
OPERATION–THERMOSTAT CONTROLS
Three thermally triggered outputs, T
as a 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.
The T
exceeded, or it can be used as part of a closed loop system to activate a cooling system and deactivate it
when the system temperature returns to tolerance.
The T
equals or falls below the value stored in the low temperature register, the T
T
temperature register, TL. The T
boundary has been met or exceeded, or as part of a closed loop system it can be used to activate a heating
system and deactivate it when the system temperature returns to tolerance.
The T
the temperature equals or falls below TL. In this way, any amount of hysteresis can be obtained.
LOW
+125˚C
TEMP
+25˚C
+½˚C
-25˚C
-55˚C
+0˚C
-½˚C
COM
remains active until the DS1620’s temperature becomes greater than the value stored in the low
HIGH
LOW
output goes high when the measured temperature meets or exceeds TH, and will stay high until
output functions similarly to the T
output can be used to indicate that a high temperature tolerance boundary has been met or
DIGITAL OUTPUT
0 11111010
0 00110010
0 00000001
0 00000000
1 11111111
1 11001110
1 10010010
(Binary)
LOW
HIGH
output can be used to indicate that a low temperature tolerance
, T
DIGITAL OUTPUT
(COUNT_PER
LOW
, and T
HIGH
01CEh
01FFh
0032h
0001h
0000h
0192h
(Hex)
00FA
HIGH
4 of 12
output. When the DS1620’s measured temperature
COUNT_PER_
becomes active (high) and remains active until the
COM
_C
, are provided to allow the DS1620 to be used
-
COUNT_REMA
C
LOW
IN)
output becomes active.