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DS1626S
High-Precision 3-Wire Digital Thermometer and Thermostat
DESCRIPTION The DS1626 and DS1726 digital
thermometers/thermostats provide temperature
measurements and stand-alone thermostat
capability over a -55°C to +125°C range. The
DS1626 offers ±0.5°C accuracy from 0°C to
+70°C and the DS1726 has ±1°C accuracy from
-10°C to +85°C. The resolution of the measured
temperature is user selectable from 9 to 12 bits.
Communication with the DS1626 and DS1726 is
achieved through a 3-wire serial bus.
The DS1626 and DS1726 offer thermostatic
functionality with three dedicated thermostat
outputs (THIGH, TLOW, and TCOM), and
overtemperature (TH) and undertemperature (TL)
user-programmable thresholds stored in on-chip
EEPROM. For stand-alone thermostat operation,
TH and TL can be programmed prior to
installation, and the DS1626/DS1726 can be
configured to automatically begin taking
temperature measurements at power-up. Table 1
summarizes the user-accessible registers. Figure
1 shows a functional diagram.
APPLICATIONS Thermostatic Controls
Industrial Controls
Consumer Products
Any Space-Constrained Thermally Sensitive
Application
FEATURES � Temperature Measurements Require No
External Components � Measure Temperatures from -55°C to
+125°C (-67°F to +257°F) � DS1626: ±0.5°C Accuracy from 0°C to
+70°C � DS1726: ±1°C Accuracy from -10°C to
+85°C � Output Resolution is User Selectable to 9,
10, 11, or 12 Bits � Wide Power-Supply Range (2.7V to 5.5V) � Convert Temperature to Digital Word in
750ms (max) � Stand-Alone Thermostat Capability � Thermostatic Settings are User Definable and
Nonvolatile (NV) � Data is Read/Written Through a 3-Wire
Serial Interface � Available in 8-Pin μSOP Package
PIN CONFIGURATION
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE TOP MARK
DS1626U -55°C to +125°C 8 μSOP 1626
DS1626U+ -55°C to +125°C 8 μSOP 1626
DS1626U/T&R -55°C to +125°C 8 μSOP, 3000-Piece 1626
DS1626U+T&R -55°C to +125°C 8 μSOP, 3000-Piece 1626
DS1726U -55°C to +125°C 8 μSOP 1726
DS1726U+ -55°C to +125°C 8 μSOP 1726
DS1726U/T&R -55°C to +125°C 8 μSOP, 3000-Piece 1726
DS1626/DS1726
High-Precision 3-Wire Digital
Thermometer and Thermostat
CLK/CNV
μSOP
VDD
THIGH
TLOW
TCOM GND
RST
DS1626
DS1726
TOP VIEW
DS1626/DS1726
PIN DESCRIPTION
PIN NAME FUNCTION DQ Data Input/Output Pin (Tri-State) for 3-Wire Serial Communication CLK/CNV Clock Input Pin for 3-Wire Serial Communication. Controls temperature
measurements when the DS1626/DS1726 is configured as a stand-alone thermostat. RST Reset Input Pin for 3-Wire Serial Communication
4 GND Ground Pin
5 TCOM Thermostat Output Pin (Push-Pull) with Programmable Hysteresis
6 TLOW Thermostat Output Pin (Push-Pull) with TL Trip Point
7 THIGH Thermostat Output Pin (Push-Pull) with TH Trip Point
8 VDD Supply Voltage. +2.7V to +5.5V input power pin.
Table 1. DS1626/DS1726 REGISTER SUMMARY
REGISTER NAME
(USER ACCESS) SIZE MEMORY
TYPE
REGISTER CONTENTS
AND POWER-UP/POR STATE Temperature
(Read Only) 12 Bits SRAM Measured Temperature (Two’s Complement)
Power-Up/POR State: -60ºC (1100 0100 0000)
TH
(Read/Write) 12 Bits EEPROM
Upper Alarm Trip Point (Two’s Complement)
Power-Up/POR State: User Defined
Initial State from Factory: +15°C (0000 1111 0000)
TL
(Read/Write) 12 Bits EEPROM
Lower Alarm Trip Point (Two’s Complement)
Power-Up/POR State: User Defined
Initial State from Factory: +10°C (0000 1010 0000)
Configuration
(Various Bits are
Read/Write and Read
Only—See Table 3)
1 Byte SRAM and
EEPROM
Configuration and Status Information (Unsigned)
4MSbs = SRAM and 4LSbs = EEPROM
Power-Up/POR State: 1000XXXX (XXXX = User
Defined)
Figure 1. DS1626/DS1726 FUNCTIONAL DIAGRAM TCOM
THIGH
TLOW
TH REGISTER DIGITAL
COMPARATOR/LOGIC
CONFIGURATION REGISTER AND CONTROL LOGIC
ADDRESS
and
I/O CONTROL
VDD
CLK/CNV
SDA
RST
GND
TEMPERATURE SENSOR AND ΔΣ ADC
TEMPERATURE REGISTER
TL REGISTER
DS1626/DS1726
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground...................................................................-0.5V to +6.0V
Operating Temperature Range.............................................................................................-55°C to +125°C
Storage Temperature Range................................................................................................-55°C to +125°C
Solder Dip Temperature (10s).............................................................................................+260°C
Reflow Oven Temperature..................................................................................................+220°C
These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect
reliability.
DC ELECTRICAL CHARACTERISTICS (VDD = 2.7V to 5.5V, TA = -55°C to +125°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage VDD (Note 1) 2.7 5.5 V
0°C to +70°C,
3.0V ≤ VDD ≤ 5.5V ±0.5
0°C to +70°C,
2.7V ≤ VDD < 3.0V ±1.25
DS1626
Thermometer
Error
(Note 2)
TERR
-55°C to +125°C ±2
°C
-10°C to +85°C,
3.0V ≤ VDD ≤ 5.5V ±1
-10°C to +85°C,
2.7V ≤ VDD < 3.0V ±1.5
DS1726
Thermometer
Error (Note 2)
TERR
-55°C to +125°C ±2
°C
Low-Level Input
Voltage VIL (Note 1) -0.5 0.3 x VDDV
High-Level Input
Voltage VIH (Note 1) 0.7 x VDD VDD + 0.3V
Input Current
each Input Pin 0.4 < VI/O < 0.9 x VDD -10 +10 μA
Temperature conversion
-55°C to +85°C 1
Temperature conversion
+85°C to +125°C 1.25
mA Active Supply
Current (Note 3) IDD 2 write 400 μA
Input Resistance RI RST to GND
DQ, CLK to VDD 1 MΩ
Standby Supply
Current ISTBY 0°C to +70°C (Note 3) 1.5 μA
VOH 1mA source current 2.4 THIGH, TLOW,
TCOM, DQ
Output Logic
Voltages (Note 1)
VOL 4mA sink current 0.4 V
Thermal Drift (Note 4) ±0.2 °C
DS1626/DS1726
EEPROM AC ELECTRICAL CHARACTERISTICS (VDD = 2.7V to 5.5V, TA = -55°C to +125°C.)
PARAMETER SYMBOLCONDITIONS MIN TYP MAX UNITS EEPROM Write Cycle Time twr 4 10 ms
EEPROM Writes NEEWR -55°C to +55°C 50k Writes
EEPROM Data Retention tEEDR -55°C to +55°C 10 Years
AC ELECTRICAL CHARACTERISTICS (VDD = 2.7V to 5.5V, TA = -55°C to +125°C.)
PARAMETER SYMBOLCONDITIONS MIN TYP MAX UNITS 9 bits 93.75
10 bits 187.5
11 bits 375 Temperature Conversion Time tTC
12 bits 750
ms
Data In to Clock Setup tDC (Note 5) 35 ns
Clock to Data In Hold tCDH (Note 5) 40 ns
Clock to Data Out Delay tCDD (Notes 5, 6) 150 ns
Clock Low/High Time tCL, tCH (Note 5) 285 ns
Clock Frequency fCLK (Note 5) 0 1.75 MHz
Clock Rise/Fall Time tR, tF (Note 5) 500 ns
RST to Clock Setup tRC (Note 5) 100 ns
Clock to RST Hold tCRH (Note 5) 40 ns
RST Inactive Time tRI (Note 7) 125 ns
Clock High to I/O Hi-Z tCDZ (Note 5) 50 ns
RST Low to I/O Hi-Z tRDZ (Note 5) 50 ns
CNV Pulse Width tCNV (Note 8) 250ns 500ms
I/O Capacitance CI/O 10 pF
Input Capacitance CI 5 pF
NOTES: 1) All voltages are referenced to ground.
2) See Figure 2 for TYPICAL OPERATING CURVES.
3) ISTBY, IDD specified with DQ, CLK/CNV = VDD and RST = GND.
4) Drift data is based on a 1000hr stress test at +125°C with VDD = 5.5V.
5) See Timing Diagrams in Figure 3. All timing is referenced to 0.7 x VDD and 0.3 x VDD.
6) Load capacitance = 50pF.
7) tRI must be 10ms minimum following any write command that involves the E2 memory.
8) 250ns is the guaranteed minimum pulse width for a conversion to start, however, a smaller pulse
width may start a conversion.
DS1626/DS1726
Figure 2. TYPICAL OPERATING CURVES
Figure 3. TIMING DIAGRAMS a) Read Timing
b) Write Timing
REFERENCE TEMPERATURE (°C)
ERROR °C
REFERENCE TEMPERATURE (°C)
ERROR (°C)
+3σ
+3σ
-3σ -3σ
MEANMEAN
DS1626 DS1726
tRC tCRH
tCRH
tRC
tRI
DS1626/DS1726
OPERATION—MEASURING TEMPERATURE The DS1626/DS1726 measure 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 degrees Celsius; for Fahrenheit applications a lookup table or conversion routine must be used.
Communication with the DS1626/DS1726 is achieved through a 3-wire serial interface, and all data is
transmitted LSb first.
The DS1626/DS1726 can be programmed to take continuous temperature measurements (continuous
conversion mode) or to take single temperature measurements on command (one-shot mode). The
measurement mode is programmed by the 1SHOT bit in the configuration register as explained in the
CONFIGURATION REGISTER section of this data sheet. The 1SHOT bit is stored in EEPROM, so it can
be programmed prior to installation if desired. In continuous conversion mode, when a Start Convert T
command is issued the DS1626/DS1726 perform consecutive temperature measurements until a Stop
Convert T command is issued. In one-shot mode, the Start Convert T command causes one temperature
measurement to be taken and then the DS1626/DS1726 return to a low-power idle state.
The resolution of the DS1626/DS1726 digital temperature data is user-configurable to 9, 10, 11, or 12
bits, corresponding to temperature increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively.
The resolution is set by the EEPROM R0 and R1 bits in the configuration register. Note that the
conversion time doubles for each additional bit of resolution.
After each temperature measurement and analog-to-digital conversion, the DS1626/DS1726 store the
measured temperature as a two’s complement number in the 12-bit temperature register (see Figure 4).
The sign bit (S) indicates if the temperature is positive or negative: for positive numbers S = 0 and for
negative numbers S = 1. The Read Temperature command provides user access to the temperature
register.
When the DS1626/DS1726 are configured for 12-bit resolution, all 12 bits of the temperature register will
contain temperature data. For 11-bit resolution, the 11 MSbs (bits 11 through 1) of the temperature
register will contain data and bit 0 will read out as 0. Likewise, for 10-bit resolution, the 10 MSbs (bits 11
through 2) will contain data, and for 9-bit the 9 MSbs (bits 11 through 3) will contain data, and all unused
LSbs will contain 0s. Since the DS1626/DS1726 transmit data LSb first, when reading data from the
temperature register, all 12 bits must be read in order to receive all MSbs of the measured data, regardless
of the conversion resolution. Table 2 gives examples of 12-bit resolution digital output data and the
corresponding temperatures.
Figure 4. TEMPERATURE, TH, and TL REGISTER FORMAT BIT 11 BIT 10 BIT 9 BIT 8 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
S 26 25 24 23 22 21 20 2-1 2-2 2-3 2-4
