DS1621 Maxim Integrated Products, DS1621 Datasheet - Page 2

• Manufacturer Part Number: DS1621
• Description: IC THERMOMETER/STAT DIG 8-DIP
• Manufacturer: Maxim Integrated Products

Specifications of DS1621

• Function: Thermometer, Thermostat
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• 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: +/- 2 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ORDERING INFORMATION
DS1621
DS1621+
DS1621S
DS1621S+
DS1621S/T&R
DS1621S+T&R
DS1621V
DS1621V+
DS1621V/T&R
DS1621V+T&R DS1621V (See Note)
Note: A “+” symbol will also be marked on the package near the Pin 1 indicator.
Table 1. DETAILED PIN DESCRIPTION
OPERATION
Measuring Temperature
A block diagram of the DS1621 is shown in Figure 1.
The DS1621 measures temperature using a bandgap-based temperature sensor. A delta-sigma analog-to-
digital converter (ADC) converts the measured temperature to a digital value that is calibrated in °C; for
°F applications, a lookup table or conversion routine must be used.
The temperature reading is provided in 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 of -55°C to +125°C in 0.5°C increments.
ORDERING
NUMBER
PIN
1
2
3
4
5
6
7
8
SYMBOL
GND
SDA
T
SCL
V
A2
A1
A0
OUT
DD
DS1621
DS1621 (See Note)
DS1621
DS1621 (See Note)
DS1621
DS1621 (See Note)
DS1621V
DS1621V (See Note)
DS1621V
MARKING
PACKAGE
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. (2.7V to 5.5V)
DS1621 in Lead-Free 300 mil DIP
DS1621 in 150 mil SOIC
DS1621 in 150 mil SO, 2500 Piece Tape-and-Reel
DS1621 in Lead-Free 150 mil SO, 2500 Piece Tape-and-Reel
DS1621 in Lead-Free 208 mil SOIC
DS1621 in 208 mil SO, 2500 Piece Tape-and-Reel
DS1621 in Lead-Free 208 mil SO, 2500 Piece Tape-and-Reel
DS1621 in 300 mil DIP
DS1621 in Lead-Free 150 mil SOIC
DS1621 in 208 mil SOIC
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DESCRIPTION