Digital Thermometer/Thermostat. DS1620 Datasheet

DS1620 Thermometer/Thermostat. Datasheet pdf. Equivalent

DS1620 Datasheet
Recommendation DS1620 Datasheet
Part DS1620
Description Digital Thermometer/Thermostat
Feature DS1620; DS1620 Digital Thermometer and Thermostat BENEFITS AND FEATURES  Simply Adds Temperature Monitorin.
Manufacture Maxim Integrated
Datasheet
Download DS1620 Datasheet




Maxim Integrated DS1620
DS1620
Digital Thermometer and
Thermostat
BENEFITS AND FEATURES
Simply Adds Temperature Monitoring and
Control to Any System
o Measures Temperatures From -55°C to
+125°C in 0.5°C Increments; Fahrenheit
Equivalent is -67°F to +257°F in 0.9°F
Increments
o Temperature is Read as a 9-Bit Value
o Converts Temperature to Digital Word in
750ms (max)
o Thermostatic Settings are User-Definable
and Nonvolatile
Can Be Used in a Wide Variety of
Applications
o Supply Voltage Range Covers From 2.7V
to 5.5V
o Data is Read From/Written Via a 3-Wire
Serial Interface (CLK, DQ, RST )
Saves Space
o Requires No External Components
o 8-Pin DIP or SOIC (208-mil) Packages
APPLICATIONS
Thermostatic Controls
Industrial Systems
Consumer Products
Thermometers
PIN ASSIGNMENT
DQ 1
8 VDD
CLK/CONV
2
7 THIGH
RST 3
6 TLOW
GND
4
5 TCOM
DS1620S 8-Pin SOIC (208-mil)
DQ
CLK/CONV
RST
GND
1
2
3
4
8 VDD
7 THIGH
6 TLOW
5 TCOM
DS1620 8-Pin DIP (300-mil)
PIN DESCRIPTION
DQ - 3-Wire Input/Output
CLK/ CONV - 3-Wire Clock Input and
Stand-alone Convert Input
RST
GND
THIGH
TLOW
TCOM
VDD
- 3-Wire Reset Input
- Ground
- High Temperature Trigger
- Low Temperature Trigger
- High/Low Combination Trigger
- Power Supply Voltage (3V - 5V)
DESCRIPTION
The DS1620 Digital Thermometer and Thermostat provides 9–bit temperature readings which indicate
the temperature of the device. With three thermal alarm outputs, the DS1620 can also act as a thermostat.
THIGH is driven high if the DS1620’s temperature is greater than or equal to a user–defined temperature
TH. TLOW is driven high if the DS1620’s temperature is less than or equal to a user–defined temperature
TL. TCOM is driven high when the temperature exceeds TH and stays high until the temperature falls
below that of TL.
1 of 12
19-7539; Rev 3; 3/15



Maxim Integrated DS1620
DS1620
User–defined temperature settings are stored in nonvolatile memory, so parts can be programmed prior to
insertion in a system, as well as used in standalone applications without a CPU. Temperature settings and
temperature readings are all communicated to/from the DS1620 over a simple 3–wire interface.
ORDERING INFORMATION
PART
PACKAGE MARKING
DESCRIPTION
DS1620
DS1620
8-Pin DIP (300 mil)
DS1620+
DS1620 (See Note)
Lead-Free 8-Pin DIP (300 mil)
DS1620S
DS1620
8-Pin SOIC (208 mil)
DS1620S+
DS1620 (See Note)
Lead-Free 8-Pin SOIC (208 mil)
DS1620S/T&R
DS1620
8-Pin SOIC (208 mil), 2000-Piece Tape-and-Reel
DS1620S+T&R
DS1620 (See Note)
Lead-Free 8-Pin SOIC (208 mil), 2000-Piece
Tape-and-Reel
Note: A “+” symbol will also be marked on the package near the Pin 1 indicator
DETAILED PIN DESCRIPTION Table 1
PIN SYMBOL
DESCRIPTION
1 DQ Data Input/Output pin for 3-wire communication port.
2 CLK/ CONV Clock input pin for 3-wire communication port. When the DS1620 is used in a
stand-alone application with no 3–wire port, this pin can be used as a convert
pin. Temperature conversion will begin on the falling edge of CONV .
3 RST Reset input pin for 3-wire communication port.
4
GND
Ground pin.
5
TCOM
High/Low Combination Trigger. Goes high when temperature exceeds TH;
will reset to low when temperature falls below TL.
6
TLOW
Low Temperature Trigger. Goes high when temperature falls below TL.
7
THIGH
High Temperature Trigger. Goes high when temperature exceeds TH.
8 VDD Supply Voltage. 2.7V – 5.5V input power pin.
Table 2. DS1620 REGISTER SUMMARY
REGISTER NAME
(USER ACCESS)
SIZE
MEMORY
TYPE
REGISTER CONTENTS
AND POWER-UP/POR STATE
Temperature
(Read Only)
9 Bits
SRAM
Measured Temperature (Two’s Complement)
Power-Up/POR State: -60ºC (1 1000 1000)
TH
(Read/Write)
9 Bits
EEPROM
Upper Alarm Trip Point (Two’s Complement)
Power-Up/POR State: User-Defined.
Initial State from Factory: +15°C (0 0001 1110)
TL
(Read/Write)
9 Bits
EEPROM
Lower Alarm Trip Point (Two’s Complement)
Power-Up/POR State: User-Defined.
Initial State from Factory: +10°C (0 0001 0100)
OPERATION-MEASURING TEMPERATURE
A block diagram of the DS1620 is shown in Figure 1.
..
2 of 12



Maxim Integrated DS1620
DS1620 FUNCTIONAL BLOCK DIAGRAM Figure 1
DS1620
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
DS1620 as either a 9–bit word (taking RST low after the 9th (MSB) bit), or as two transfers of 8–bit
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
XXXXXXX1
LSB
11001110
T = -25°C
3 of 12







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)