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DS1621
 
2 of 16
ORDERING INFORMATION
ORDERING
NUMBER
PACKAGE
MARKING
DESCRIPTION
DS1621
DS1621
DS1621 in 300 mil DIP
DS1621+
DS1621 (See Note)
DS1621 in Lead-Free 300 mil DIP
DS1621S
DS1621
DS1621 in 150 mil SOIC
DS1621S+
DS1621 (See Note)
DS1621 in Lead-Free 150 mil SOIC
DS1621S/T&R    DS1621
DS1621 in 150 mil SO, 2500 Piece Tape-and-Reel
DS1621S+T&R    DS1621 (See Note)
DS1621 in Lead-Free 150 mil SO, 2500 Piece Tape-and-Reel
DS1621V
DS1621V
DS1621 in 208 mil SOIC
DS1621V+
DS1621V (See Note)    DS1621 in Lead-Free 208 mil SOIC
DS1621V/T&R    DS1621V
DS1621 in 208 mil SO, 2500 Piece Tape-and-Reel
DS1621V+T&R   DS1621V (See Note)    DS1621 in Lead-Free 208 mil SO, 2500 Piece Tape-and-Reel
 
Note: A + symbol will also be marked on the package near the Pin 1 indicator.
 
Table 1. DETAILED PIN DESCRIPTION
PIN
SYMBOL     DESCRIPTION
1
SDA
Data input/output pin for 2-wire serial communication port.
2
SCL
Clock input/output pin for 2-wire serial communication port.
3
T
OUT
 
Thermostat output. Active when temperature exceeds TH; will reset when
temperature falls below TL.
4
GND
Ground pin.
5
A2
Address input pin.
6
A1
Address input pin.
7
A0
Address input pin.
8
V
DD
 
Supply voltage input power pin. (2.7V to 5.5V)
 
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 癈; for
癋 applications, a lookup table or conversion routine must be used.
 
The temperature reading is provided in a 9-bit, twos 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癈 to +125癈 in 0.5癈 increments.
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DS1621V/T&R 制造商:Maxim Integrated Products 功能描述:2 WIRE THERMOMETER 208MIL 8-SO T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC
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