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Kynix Part #: KY32-DS1621
Manufacturer Part#:


Product Category: IC Chips
Manufacturer: Maxim Integrated
  datasheetDS1621 Datasheet
Package: SOP-8
Quantity: 23420 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
Moisture Sensitivity Level(MSL): 3(168 Hours)
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Manufacturer: Maxim Integrated
Product Category: IC Chips
Series: -
Packaging: Tube
Package-Case: 8-DIP (0.300", 7.62mm)
Operating-Temperature: -55°C ~ 125°C
Output-Type: I2C
Features: One-Shot, Output Switch, Standby Mode
Voltage-Supply: 2.7 V ~ 5.5 V
Supplier-Device-Package: 8-DIP
Resolution: 8 b
Sensor-Type: Digital, Local
Test-Condition: 0°C ~ 70°C (-55°C ~ 125°C)
Sensing-Temperature-Local: -55°C ~ 125°C
Sensing-Temperature-Remote: -
Accuracy-Highest-Lowest: ±0.5°C (±2°C)
Features, Applications

Features, Applications


Temperature measurements require no external components Measures temperatures from in 0.5°C increments. Fahrenheit equivalent in 0.9°F increments Temperature is read a 9-bit value (2-byte transfer) Wide power supply range to 5.5V) Converts temperature to digital word in 1 second Thermostatic settings are user definable and nonvolatile Data is read from/written via a 2-wire serial interface (open drain I/O lines) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal sensitive system 8-pin DIP or SO package (150mil and 208mil)

SDA SCL GND TOUT A1 A2 VDD - 2-Wire Serial Data Input/Output - 2-Wire Serial Clock - Ground - Thermostat Output Signal - Chip Address Input - Chip Address Input - Chip Address Input - Power Supply Voltage


The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, TOUT, is active when the temperature of the device exceeds a user-defined temperature TH. The output remains active until the temperature drops below user defined temperature TL, allowing for any hysteresis necessary. User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple 2-wire serial interface.

PIN SYMBOL SDA SCL TOUT GND A1 A0 VDD DESCRIPTION Data input/output pin for 2-wire serial communication port. Clock input/output pin for 2-wire serial communication port. Thermostat output. Active when temperature exceeds TH; will reset when temperature falls below TL. Ground pin. Address input pin. Address input pin. Address input pin. Supply voltage input power pin. to 5.5V)

Measuring Temperature A block diagram of the DS1621 is shown in Figure 1. The DS1621 measures temperatures through the use of an onboard proprietary temperature measurement technique. A block diagram of the temperature measurement circuitry is shown in Figure 2. The DS1621 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 -55°C. If the counter reaches 0 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 0. 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. This calculation is done inside the DS1621 to provide 0.5°C resolution. The temperature reading is provided a 9-bit, two's complement reading by issuing the READ TEMPERATURE command. Table 2 describes the exact relationship of output data to measured temperature. The data is transmitted through the 2-wire serial interface, MSB first. The DS1621 can measure temperature over the range in 0.5°C increments. For Fahrenheit usage a lookup table or conversion factor must be used.


Temperature Sensor Digital, Local -55°C ~ 125°C 8 b 8-DIP
Search Part number : "DS162" Included word is 15
Part Number Manufacturer Package Quantity Description
DS1624 Maxim Integrated DIP-8P 9975 SENSOR TEMPERATURE I2C 8DIP
DS1629S+T MAXIM 8SO 590
DS1626S+ Maxim Integrated 8-SOIC (0.209", 5.30mm Width) 156 SENSOR TEMPERATURE 3-WIRE 8SOIC
DS1621S+TR MAXIM SOP 19798
DS1620S+ Maxim Integrated 8-SOIC (0.209", 5.30mm Width) 24485 SENSOR TEMPERATURE 3-WIRE 8SO
DS1626U+ Maxim Integrated 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 438 SENSOR TEMPERATURE 3-WIRE 8UMAX
DS1620S+T MAXIM SOP8 4119
DS1621S-T&R DALLAS SO-8 33360
DS1620S+T&R MAXIM SOP8 2585
DS1621S-TR DS SOP-8L 8962
DS1626U+T MAXIM MSOP8 2300
DS1626U+T&R Maxim Integrated 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 4060 SENSOR TEMPERATURE 3-WIRE 8UMAX
DS1620S+T&R Maxim Integrated 8-SOIC (0.209", 5.30mm Width) 6142 SENSOR TEMPERATURE 3-WIRE 8SO
DS1621V Maxim Integrated 8-SOIC (0.209", 5.30mm Width) 1232 SENSOR TEMPERATURE I2C 8SOIC
DS1621V+ Maxim Integrated 8-SOIC (0.209", 5.30mm Width) 469 SENSOR TEMPERATURE I2C 8SOIC
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