DS1631Z+T&R ,High-Precision Digital Thermometer and ThermostatElectrical Characteristics(V = 2.7V to 5.5V; T = -55°C to +125°C.)DD APARAMETER SYMBOL CONDITION MI ..
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DS1633J/8 ,CMOS Dual Peripheral Driversfeatures output transistor protection if theat 5V)V supply is lost by forcing the output into the h ..
DS1633J-8 ,CMOS Dual Peripheral DriversDS1631/DS3631/DS1632/DS3632/DS1633/DS3633/DS1634/DS3634CMOSDualPeripheralDriversJuly1992DS1631/DS36 ..
DS1640S ,Personal Computer Power FETPIN DESCRIPTIONV - +3 to +5 Volt InputCCGND - GroundIN1-IN4 - FET SourcesOUT1-OUT4 - FET DrainsGATE ..
DS1640S ,Personal Computer Power FETFEATURES PIN ASSIGNMENT Contains four P channel power FET switchesIN1 IN41 16that can each supply ..
DTTI5516AUA ,DTTI5516 SINGLE MODULE DEMODULATOR AND DECODER IC FOR DIGITAL VIDEO SET-TOP BOXES Data Briefing®DTTi5516Single module demodulator and decoder ICfor digital video set-top boxesDATA BRIEFDescripti ..
DTV110 ,CRT HORIZONTAL DEFLECTION HIGH VOLTAGE DAMPER DIODEFEATURES AND BENEFITSHIGH BREAKDOWN VOLTAGE CAPABILITYISOWATT220ACTO-220ACVERY FAST RECOVERY DIODED ..
DTV110F ,CRT HORIZONTAL DEFLECTION HIGH VOLTAGE DAMPER DIODEFEATURES AND BENEFITSHIGH BREAKDOWN VOLTAGE CAPABILITYISOWATT220ACTO-220ACVERY FAST RECOVERY DIODED ..
DTV1500 ,CRT HORIZONTAL DEFLECTION HIGH VOLTAGE DAMPER DIODEABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Repetitive peak reverse voltage 1500 VRRMI RMS ..
DTV1500H ,HIGH VOLTAGE DAMPER DIODE (CRT HORIZONTAL DEFLECTION)ABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Repetitive peak reverse voltage 1500 VRRMI RMS ..
DTV1500HD ,HIGH VOLTAGE DAMPER DIODE (CRT HORIZONTAL DEFLECTION)ABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Repetitive peak reverse voltage 1500 VRRMI RMS ..
DS1631AU+-DS1631S+-DS1631U+-DS1631Z+-DS1631Z+T&R
High-Precision Digital Thermometer and Thermostat
See Table 2 for Pin Descriptions.
General DescriptionThe DS1631, DS1631A, and DS1731 digital thermome-
ters provide 9, 10, 11, or 12-bit temperature readings over
a -55°C to +125°C range. The DS1631 and DS1631A
thermometer accuracy is ±0.5°C from 0°C to +70°C with 3.0V ≤ VDD ≤ 5.5V, and the DS1731 accuracy is ±1°C from -10°C to +85°C with 3.0V ≤ VDD ≤ 5.5V. The ther-
mostat on all three devices provides custom hysteresis
with user-defined trip points (TH and TL). The TH and
TL registers and thermometer configuration settings are
stored in NV EEPROM so they can be programmed prior
to installation. In addition, the DS1631A automatically
begins taking temperature measurements at power-up,
which allows it to function as a stand-alone thermostat.
Pin descriptions for the DS1631/DS1631A/DS1731 are pro-
vided in Table 2 and user-accessible registers are summa-
rized in Table 3. A functional diagram is shown in Figure 1.
Applications●Network Routers and Switches●Cellular Base Stations●Portable Products●Any Space-Constrained Thermally Sensitive Product
Beneits and Features●Maximize System Accuracy in Broad Range of
Thermal Management ApplicationsOperating Temperature Range: -55°C to +125°C
(-67°F to +257°F)DS1631 and DS1631A: ±0.5°C Accuracy over 0°C
to +70°C RangeDS1731: ±1°C Accuracy over a -10°C to +85°C RangeUser-Selectable Output Resolution from 9 Bits to
12 Bits●Reduce Cost with No External Components●Simplify Distributed Temperature-Sensing Applications
with Multidrop CapabilityUp to Eight Devices Can Operate on a 2-Wire Bus●Flexible and Nonvolatile User-Defined Thermostatic
Modes with Custom Hysteresis●Available in 8-Pin µSOP and SO (DS1631 and
DS1631A Only) and the 8-Pin DIP (DS1631 Only)
Packages
Ordering Information appears at end of data sheet.
Pin ConigurationsSDA
SCL
TOUT
GND
VDD
DS1631
µSOP
(DS1631U+, DS1631AU+, DS1731U+)1
TOP VIEW
SDA
SCL
TOUT
GND
VDD
DS1631
SO (150mil and 208mil)
(DS1631Z+, DS1631S+)1
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
Voltage 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) .......See IPC/JEDEC J-STD-020A
Specification
Reflow Oven Temperature ...............................................+220°C
(VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETERSYMBOLCONDITIONMINMAXUNITSSupply VoltageVDD(Note 1)2.75.5V
DS1631, DS1631A
Thermometer Error (Note 2)TERR
0°C to +70°C, 3.0V ≤ VDD ≤ 5.5V±0.50°C to +70°C,2.7V ≤ VDD < 3.0V±1
-55°C to +125°C±2
DS1731 Thermometer Error
(Note 2)TERR
-10°C to +85°C, 3.0V ≤ VDD ≤ 5.5V±1-10°C to +85°C, 2.7V ≤ VDD < 3.0V±1.5
-55°C to +125°C±2
Low-Level Input VoltageVIL-0.50.3 x VDDV
High-Level Input VoltageVIH0.7 x VDDVDD + 0.3V
SDA Low-Level Output
Voltage
VOL13mA sink current00.4VOL26mA sink current00.6
Input Current Each I/O Pin0.4 < VI/O < 0.9VDD-10+10µA
Active Supply Current (Note 3)IDD
Temperature conversion
-55°C to +85°C1
Temperature conversion
+85°C to +125°C1.25
E2 write400Communication only110
Standby Supply CurrentISTBY0°C to +70°C (Note 4)800nA
TOUT Output Logic VoltageVOH1mA source current (Note 1)2.4V
VOL4mA sink current (Note 1)0.4V
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
Absolute Maximum Ratings*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.)
Note 1: All voltages are referenced to GND.
Note 2: See Figure 2 for Typical Operating Curves.
Note 3: Specified with TOUT pin open; A0, A1, A2 = 0V or VDD; and fSCL ≥ 2Hz.
Note 4: Specified with temperature conversions stopped; TOUT pin open; SDA = VDD; SCL = VDD; and A0, A1, A2 = 0V or VDD.
Note 5: See Timing Diagram in Figure 3. All timing is referenced to 0.9 x VDD and 0.1 x VDD.
Note 6: After this period the first clock pulse is generated.
Note 7: For example, if CB = 300pF, then tR[min] = tF[min] = 50ns.
(VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETERSYMBOLCONDITIONMINTYPMAXUNITSTemperature Conversion TimetTC
9-bit resolution93.75
10-bit resolution187.5
11-bit resolution375
12-bit resolution750
SCL FrequencyfSCL0400kHz
Bus Free Time Between a STOP
and START ConditiontBUF(Note 5)1.3µs
START and Repeated START
Hold Time from Falling SCLtHD:STA(Note 5, 6)0.6µs
Low Period of SCL tLOW(Note 5)1.3µs
High Period of SCL tHIGH(Note 5)0.6µs
Repeated START Condition
Setup Time to Rising SCL tSU:STA(Note 5)0.6µs
Data-Out Hold Time from
Falling SCLtHD:DAT(Note 5)00.9µs
Data-In Setup Time to
Rising SCLtSU:DAT(Note 5)100ns
Rise Time of SDA and SCL tR(Note 5, 7)20 + 0.1CB1000ns
Fall Time of SDA and SCL tF(Note 5, 7)20 + 0.1CB300ns
STOP Setup Time to Rising
SCL tSU:STO(Note 5)0.6µs
Capacitive Load for Each
Bus LineCB400pF
I/O CapacitanceCI/O10pF
Input CapacitanceCI5pF
Spike Pulse Width that can be
Suppressed by Input FiltertSP050ns
PARAMETERSYMBOLCONDITIONMINTYPMAXUNITSEEPROM Write Cycle Timetwr410ms
EEPROM WritesNEEWR-55°C to +55°C50kWrites
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
AC Electrical Characteristics
EEPROM AC Electrical Characteristics
PINSYMBOLDESCRIPTIONSDAData Input/Output Pin for 2-Wire Serial Communication Port. Open-Drain.SCLClock Input Pin for 2-Wire Serial Communication Port.TOUTThermostat Output Pin. Push-Pull.GNDGround PinA2Address Input PinA1Address Input PinA0Address Input PinVDDSupply Voltage Pin. +2.7V to +5.5V Power-Supply Pin.
Figure 1. Functional Diagram
ADDRESS
AND
I/O CONTROL
VDD
SCL
SDA
GND
CONFIGURATION REGISTER
AND CONTROL LOGIC
TEMPERATURE SENSOR
AND ∆Σ ADC
TEMPERATURE REGISTER
TH REGISTER
TL REGISTER
DIGITAL
COMPARATOR/LOGIC
TOUT
DS1631ERROR
(°C
REFERENCE TEMPERATURE (°C)
DS1631/DS1631A+3σ
MEAN
-3σ
ERROR
(°C
REFERENCE TEMPERATURE (°C)
DS1731
+3σ
MEAN
-3σ
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
Table 2. Detailed Pin Description
Table 3. Register Summary
REGISTER NAME
(USER ACCESS)
SIZE
(BYTES)
MEMORY
TYPE
REGISTER CONTENTS
AND POWER-UP STATETemperature (Read Only)2SRAMMeasured temperature in two’s complement format.
Power-up state: -60ºC (1100 0100 0000 0000)
TH (Read/Write)2EEPROMUpper alarm trip point in two’s complement format.
Factory state: 15ºC (0000 1111 0000 0000)
TL (Read/Write)2EEPROMLower alarm trip point in two’s complement format.
Factory state: 10ºC (0000 1010 0000 0000)
Coniguration (Various bits are Read/
Write and Read Only—See Table 5)1SRAM,
EEPROM
Coniguration and status information. Unsigned data.
6 MSbs = SRAM
2 LSbs (POL and 1SHOT bits) = EEPROMPower-up state: 100011XX (XX = user deined)
Figure 3. Timing Diagram
ALL TIMING IS REFERENCED TO 0.9 X VDD AND 0.1 x VDD.
SDA
STOP
SCL
STARTREPEATED
START
tBUF
tLOWtR
tHD:STAtHD:STA
tSP
tHD:DATtHIGHtSU:DAT
tSU:STA
tSU:STO
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
Operation—Measuring TemperatureThe DS1631, DS1631A, and DS1731 measure tempera-
ture using bandgap-based temperature sensors. A delta-
sigma analog-to-digital converter (ADC) converts the
measured temperature to a 9-, 10-, 11-, or 12-bit (user-
selectable) digital value that is calibrated in °C; for °F
applications a lookup table or conversion routine must be
used. Throughout this data sheet, the term “conversion” is
used to refer to the entire temperature measurement and
ADC sequence.
The DS1631 and DS1731 always power-up in a low-pow-
er idle state, and the Start Convert T command must be
used to initiate conversions. The DS1631A begins conver-
sions automatically at power-up in the mode determined
by the configuration register’s 1SHOT bit.
The DS1631, DS1631A, and DS1731 can be programmed
to perform continuous consecutive conversions (continu-
ous-conversion mode) or to perform single conversions
on command (one-shot mode). The conversion mode is
programmed through the 1SHOT bit in the configuration
register as explained in the Configuration Register sec-
tion of this data sheet. In continuous-conversion mode,
the DS1631A begins performing continuous conversions
immediately at power-up, and the DS1631 and DS1731
begin continuous conversions after a Start Convert T
command is issued. For all three devices, consecu-
tive conversions continue to be performed until a Stop
Convert T command is issued, at which time the device
goes into a low-power idle state. Continuous conversions
can be restarted at any time using the Start Convert T
command.
In one-shot mode the DS1631A performs a single con-
version at power-up, and the DS1631 and DS1731
perform a single temperature conversion when a Start
Convert T command is issued. For all three devices,
when the conversion is complete the device enters a
low-power idle state and remains in that state until a
single temperature conversion is again initiated by a Start
Convert T command.
The resolution of the output 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 default resolution at power-
up is 12 bits, and it can be changed through the R0 and
R1 bits in the configuration register. Note that the conver-
sion time doubles for each additional bit of resolution.
After each conversion, the digital temperature is stored
as a 16-bit two’s complement number in the two-byte
temperature register as shown in 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. Bits 3 through 0 of
the temperature register are hardwired to 0. When the
device is configured for 12-bit resolution, the 12 MSbs
(bits 15 through 4) of the temperature register contain
temperature data. For 11 bit resolution, the 11 MSbs (bits
15 through 5) of the temperature register contain data,
and bit 4 is 0. Likewise, for 10-bit resolution, the 10 MSbs
(bits 15 through 6) contain data, and for 9-bit the 9 MSbs
(bits 15 through 7) contain data, and all unused LSbs con-
tain 0s. Table 4 gives examples of 12-bit resolution output
data and the corresponding temperatures.
Table 4. 12-Bit Resolution Temperature/
Data Relationship
TEMPERATURE
(°C)
DIGITAL OUTPUT
(BINARY)
DIGITAL
OUTPUT (HEX)+1250111 1101 0000 00007D00h
+25.06250001 1001 0001 00001910h
+10.1250000 1010 0010 00000A20h
+0.50000 0000 1000 00000080h0000 0000 0000 00000000h
-0.51111 1111 1000 0000FF80h
-10.1251111 0101 1110 0000F5E0h
-25.06251110 0110 1111 0000E6F0h
-551100 1001 0000 0000C900h
BIT 15BIT 14BIT 13BIT 12BIT 11BIT 10BIT 9BIT 8
MS BYTE S26252423222120
BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0
LS BYTE2-12-22-32-40000
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
Operation—Thermostat FunctionThe thermostat output (TOUT) is updated after every
temperature conversion, based on a comparison between
the measured digital temperature and user-defined upper
and lower thermostat trip points. TOUT remains at the
updated value until the next conversion completes. When
the measured temperature meets or exceeds the value
stored in the upper trip-point register (TH), TOUT becomes
active and remains active until the measured temperature
falls below the value stored in the lower trip-point register
(TL) (see Figure 5). This allows the user to program any
amount of hysteresis into the output response. The active
state of TOUT is user-programmable through the polarity
bit (POL) in the configuration register.
The user-defined values in the TH and TL registers (see
Figure 4) must be in two’s complement format with the
MSb (bit 15) containing the sign bit (S). The TH and TL
resolution is determined by the R0 and R1 bits in the
configuration register (see Table 6), so the TH and TL
resolution matches the output temperature resolution. For
example, for 10-bit resolution bits 5 through 0 of the TH
and TL registers read out as 0 (even if 1s are written to
these bits), and the converted temperature is compared
to the 10 MSbs of TH and TL.
The TH and TL registers are stored in EEPROM; there-
fore, they are NV and can be programmed prior to device
installation. Writing to and reading from the TH and TL
registers is achieved using the Access TH and Access
TL commands. When making changes to the TH and TL
registers, conversions should first be stopped using the
Stop Convert T command if the device is in continuous
conversion mode. Note that if the thermostat function is
not used, the TH and TL registers can be used as general-
purpose NV memory.
Another thermostat feature is the temperature high and
low flags (THF and TLF) in the configuration register.
These bits provide a record of whether the temperature
has been greater than TH or less than TL at anytime since
the device was powered up. These bits power up as 0s,
and if the temperature ever exceeds the TH register value,
the THF bit is set to 1, or if the temperature ever falls
below the TL value, the TLF bit is set to 1. Once THF and/
or TLF has been set, it remains set until overwritten with a
0 by the user or until the power is cycled.
Ds1631A Stand-Alone
Thermostat OperationSince the DS1631A automatically begins taking tem-
perature measurements at power-up, it can function as
a standalone thermostat (i.e., it can provide thermostatic
operation without microcontroller communication). For
standalone operation, the NV TH and TL registers and the
POL and 1SHOT bits in the configuration register should
be programmed to the desired values prior to installation.
Since the default conversion resolution at power-up is 12
bits (R1 = 1 and R0 = 1 in the configuration register), the
conversion resolution is always 12 bits during standalone
thermostat operation.
Coniguration RegisterThe configuration register allows the user to program
various DS1631 options such as conversion resolution,
TOUT polarity, and operating mode. It also provides infor-
mation to the user about conversion status, EEPROM
activity, and thermostat activity. The configuration register
is arranged as shown in Figure 6 and detailed descrip-
tions of each bit are provided in Table 5. This register
can be read from and written to using the Access Config
command. When writing to the configuration register, con-
versions should first be stopped using the Stop Convert T
command if the device is in continuous conversion mode.
Note that the POL and 1SHOT bits are stored in EEPROM
so they can be programmed prior to installation is desired.
All other configuration register bits are SRAM and power
up in the state shown in Table 5.
Figure 5. Thermostat Output Operation
Figure 6. Configuration RegisterTEMP
TOUT
POL = 1 (TOUT IS ACTIVE HIGH)
LOGIC 1
LOGIC 0
MSBBIT 6BIT 5BIT 4BIT 3BIT 2BIT 1LSBDONETHFTLFNVBR1R0POL*1SHOT*
*NV (EEPROM)
DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
