DS75LVU+ Fast Delivery |IC PHOENIX CO.,LIMITED

DS75LVU+ ,Digital Thermometer and ThermostatBlock DiagramPRECISION OVERSAMPLING DIGITALREFERENCE MODULATOR DECIMATORVDDCONFIGURATIONREGISTER SC ..
DS75LXS+ ,Digital Thermometer and Thermostat with Extended AddressingELECTRICAL CHARACTERISTICS (continued) (1.7V ≤ V ≤ 3.7V, T = -55°C to +125°C.) DD APARAMETER SYMBOL ..
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DS75S/T&R ,Digital Thermometer and ThermostatPin DescriptionPIN SYMBOL DESCRIPTION1 SDA Data input/output pin for 2-wire serial communication po ..
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ECH8604 ,N CHANNEL MOS SILICON TRANSISTOR

DS75LVU+
Digital Thermometer and Thermostat
General Description
The DS75LV low-voltage (1.7V to 3.7V) digital thermometer
and thermostat provides 9, 10, 11, or 12-bit digital temperature
readings over a -55°C to +125°C range with ±2°C accuracy
over a -25°C to +100°C range. At power-up, the DS75LV
defaults to 9-bit resolution for software compatibility with the
LM75. Communication with the DS75LV is achieved through
a simple 2-wire serial interface.
The DS75LV thermostat has a dedicated open-drain output
(OS) and programmable fault tolerance, which allows the
user to define the number of consecutive error conditions that
must occur before OS is activated. There are two thermostatic
operating modes that control thermostat operation based on
user-defined trip-points (TOS and THYST).
Applications●Personal Computers●Cellular Base Stations●Ofice Equipment●Any Thermally Sensitive System
Beneits and Features●Extend Performance Range with Low-Voltage, 1.7V to 3.7V Operating Range●Maximize System Accuracy in Broad Range of
Thermal Management ApplicationsMeasures Temperature from -55°C to +125°C
(-67°F to +257°F)±2°C Accuracy over a -25°C to 100°C RangeUser-Conigurable Resolution from 9 Bits (Default)
to 12 Bits (0.5°C to 0.0625°C)●Easy Upgrade to LM75: Pin and Software Compatible●Simplify Distributed Temperature-Sensing
Applications with Multidrop CapabilityUp to Eight DS75LVs Can Operate on 2-Wire Bus●Increase Reliability and System RobustnessInternally Filtered Data Lines for Noise Immunity
(50ns Deglitch)Bus Timeout Feature Prevents Lockup on 2-Wire
Interface●Minimize Power Consumption with Built-In Shutdown
Mode●Flexible User-Defined Thermostatic Modes with
Programmable Fault Tolerance
Ordering Information appears at end of data sheet.
DS75LVDigital Thermometer and Thermostat
Functional Block Diagram
TOS AND THYST
REGISTERS
CONFIGURATION
REGISTER
TEMPERATURE
REGISTER
OVERSAMPLING
MODULATOR
PRECISION
REFERENCE
DIGITAL
DECIMATOR
ADDRESS
AND
I/O CONTROLA1
SCL
SDA
VDD
GND
THERMOSTAT
COMPARATOR
DS75LV
Voltage on VDD, Relative to Ground ....................-0.3V to +4.0VVoltage on Any Other Pin, Relative to Ground ....-0.3V to +6.0VOperating Temperature Range .........................-55°C to +125°C
Storage Temperature Range ............................-55°C to +125°C
Lead Temperature (soldering, 10s) .................................+260°C
(1.7V ≤ VDD ≤ 3.7V, TA = -55°C to +125°C, unless otherwise noted.)
(1.7V ≤ VDD ≤ 3.7V, TA = -55°C to +125°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINMAXUNITS
Supply VoltageVDD1.73.7V
Thermometer Error (Note 1)TERR-25 to +100±2.0°C-55 to +125±3.0
Input Logic-HighVIH(Note 2)0.7 x VDD5.5V
Input Logic-LowVIL(Note 2)-0.50.3 x VDDV
SDA Output Logic Low Voltage
(Note 2)
VOL13mA sink current00.4VVOL26mA sink current00.6
OS Saturation VoltageVOL4mA sink current (Notes 1, 2)0.8V
Input Current Each I/O Pin0.4 < VI/O< 0.9 x VDD-10+10µA
I/O CapacitanceCI/O10pF
Standby CurrentIDD1(Notes 3, 4)2µA
Active Current (Notes 3, 4)IDDActive temp conversions1000µACommunication only100
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Resolution912Bits
Temperature Conversion TimetCONVT
9-bit conversions2510-bit conversions50
11-bit conversions100
12-bit conversions200
SCL FrequencyfSCL400kHz
Bus Free Time Between a STOP and START ConditiontBUF(Note 5)1.3µs
START and Repeated START
Hold Time from Falling SCLtHD:STA(Notes 5, 6)600ns
DS75LVDigital Thermometer and Thermostat
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
DC Electrical Characteristics
AC Electrical Characteristics
(1.7V ≤ VDD ≤ 3.7V, TA = -55°C to +125°C, unless otherwise noted.)
Note 1: Internal heating caused by OS loading causes the DS75LV to read approximately 0.5°C higher if OS is sinking the max
rated current.
Note 2: All voltages are referenced to ground.
Note 3: IDD specified with VDD at 3.0V and SDA, SCL = 3.0V, 0°C to +70°C.
Note 4: IDD specified with OS pin open.
Note 5: See Figure 2 for timing diagram. 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: The DS75LV provides an internal hold time of at least 75ns on the SDA signal to bridge the undefined region of SCL’s
falling edge.
Note 8: This timeout applies only when the DS75LV is holding SDA low. Other devices can hold SDA low indefinitely and the
DS75LV does not reset.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
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)600ns
Data-Out Hold Time from
Falling SCLtHD:DAT(Notes 5, 7)00.9µs
Data-In Setup Time to Rising
SCLtSU:DAT(Note 5)100ns
Rise Time of SDA and SCL (Receive)tR(Note 5)1000ns
Fall Time of SDA and SCL (Receive)tF(Note 5)300ns
Spike Suppression Filter Time
(Deglitch Filter) tSS050ns
STOP Setup Time to Rising
SCL tSU:STO(Note 5)600ns
Capacitive Load for Each Bus
LineCB400pF
Input CapacitanceCI5pF
Serial Interface Reset TimetTIMEOUTSDA time low (Note 8)75325ms
DS75LVDigital Thermometer and Thermostat
AC Electrical Characteristics (continued)
Pin Description
Figure 1. Block Diagram
PINNAMEFUNCTIONSDAData Input/Output. For 2-wire serial communication port. Open drain.SCLClock Input. 2-wire serial communication port.OSThermostat Output. Open drain.GNDGroundA2Address InputA1Address InputA0Address InputVDDSupply Voltage. +1.7V to +3.7V supply pin.
TOS AND THYST
REGISTERS
CONFIGURATION
REGISTER
TEMPERATURE
REGISTER
OVERSAMPLING
MODULATOR
PRECISION
REFERENCE
DIGITAL
DECIMATOR
ADDRESS
AND
I/O CONTROLA1
SCL
SDA
VDD
GND
THERMOSTAT
COMPARATOR
DS75LV
SDA
SCL
tSU;DAT
tLOW
tHD;STA
tHD;DAT
tSU;STA
tHD;STA
tSU;STOtBUFtSP
DS75LVDigital Thermometer and Thermostat
Detailed Description
Measuring Temperature
The DS75LV measures temperature using a bandgap
temperature sensing architecture. An on-board delta-sigma
analog-to-digital converter (ADC) converts the measured
temperature to a digital value that is calibrated in degrees
centigrade; for Fahrenheit applications a lookup table or
conversion routine must be used. The DS75LV is factory-calibrated and requires no external components to measure
temperature.
At power-up the DS75LV immediately begins converting
temperature to a digital value. The resolution of the
digital output 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, with
9-bit default resolution at power-up. The resolution is controlled via the R0 and R1 bits in the configuration register as explained in the Configuration Register
section. Note that the conversion time doubles for each
additional bit of resolution.
After each temperature measurement and analog-to-digital
conversion, the DS75LV stores the temperature as a 16-bit
two’s complement number in the 2-byte temperature register
(see Figure 3). The sign bit (S) indicates if the temperature is positive or negative: for positive numbers S = 0 and for
negative numbers S = 1. The most recently converted digital
measurement can be read from the temperature register at
any time. Since temperature conversions are performed in
the background, reading the temperature register does not
affect the operation in progress.
Bits 3 through 0 of the temperature register are hardwired to 0. When the DS75LV 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 reads out as 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 contain 0s. Table 1 gives examples
of 12-bit resolution digital output data and the corresponding
temperatures.
Table 1. 12-Bit Resolution Temperature/
Data Relationship
Figure 3. Temperature, TOS, and THYST Register Format
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 2 bit 1bit 0
LS Byte2-12-22-32-40000
DS75LVDigital Thermometer and Thermostat
Shutdown Mode
For power-sensitive applications, the DS75LV offers
a low-power shutdown mode. The SD bit in the configuration register controls shutdown mode. When SD
is changed to 1, the conversion in progress is completed
and the result stored in the temperature register after
which the DS75LV goes into a low-power standby state.
The OS output is cleared if the thermostat is operating in
interrupt mode and OS remains unchanged in comparator
mode. The 2-wire interface remains operational in shut-
down mode, and writing a 0 to the SD bit returns the
DS75LV to normal operation.
Thermostat
The DS75LV thermostat has two operating modes, com-
parator mode and interrupt mode, which activate and
deactivate the open-drain thermostat output (OS) based
on user-programmable trip-points (TOS and THYST). The
DS75LV powers up with the thermostat in comparator
mode, active-low OS polarity, over-temperature trip-point
(TOS) register set to 80°C, and the hysteresis trip-point
(THYST) register set to 75°C. If these power-up settings
are compatible with the application, the DS75LV can be
used as a standalone thermostat (i.e., no 2–wire com-munication required). If interrupt mode operation, active-
high OS polarity or different TOS and THYST values are
desired, they must be programmed after power-up, so
standalone operation is not possible.
In both operating modes, the user can program the ther-
mostat fault tolerance, which sets how many consecutive
temperature readings (1, 2, 4, or 6) must fall outside of
the thermostat limits before the thermostat output is trig-
gered. The fault tolerance is set by the F1 and F0 bits in
the configuration register. At power-up the fault tolerance
is set to 1.
The data format of the TOS and THYST registers is identical
to that of the temperature register (see Figure 3), i.e., a
2-byte two’s complement representation of the trip-point
temperature in degrees centigrade with bits 3 through 0
hardwired to 0. After every temperature conversion, the
measurement is compared to the values stored in the TOS
and THYST registers. The OS output is updated based on
the result of the comparison and the operating mode of the
IC. The number of TOS and THYST bits used during the thermostat comparison is equal to the conversion resolution set by the R1 and R0 bits in the configuration register. For example, if the resolution is 9 bits, only the 9 MSbs of TOS
and THYST are used by the thermostat comparator.
The active state of the OS output can be changed via the
POL bit in the configuration register. The power-up default
is active low.
If the user does not wish to use the thermostat capabilities
of the DS75LV, the OS output should be left floating. Note
that if the thermostat is not used, the TOS and THYST
registers can be used for general storage of system data.
Comparator Mode: When the thermostat is in compara-
tor mode, OS can be programmed to operate with any
amount of hysteresis. The OS output becomes active when the measured temperature exceeds the TOS value
a consecutive number of times as defined by the F1 and
F0 fault tolerance (FT) bits in the configuration register. OS
then stays active until the first time the temperature falls
below the value stored in THYST. Putting the device into
shutdown mode does not clear OS in comparator mode.
Thermostat comparator mode operation with FT = 2 is
illustrated in Figure 4.
Interrupt Mode: In interrupt mode, the OS output first becomes active when the measured temperature exceeds
the TOS value a consecutive number of times equal to the
FT value in the configuration register. Once activated, OS
can only be cleared by either putting the DS75LV into
shutdown mode or by reading from any register (temperature,
configuration, TOS, or THYST ) on the device. Once OS
has been deactivated, it is only reactivated when the
measured temperature falls below the THYST value a consecutive number of times equal to the FT value. Again,
OS can only be cleared by putting the device into shut-down mode or reading any register. Thus, this interrupt/
clear process is cyclical between TOS and THYST events
(i.e, TOS, clear, THYST, clear, TOS, clear, THYST, clear,
etc.). Thermostat interrupt mode operation with FT = 2 is
illustrated in Figure 4.
DS75LVDigital Thermometer and Thermostat
Coniguration Register
The configuration register allows the user to program
various DS75LV options such as conversion resolution,
thermostat fault tolerance, thermostat polarity, thermostat
operating mode, and shutdown mode. The configuration
register is arranged as shown in Figure 5 and detailed
descriptions of each bit are provided in Table 2. The user has read/write access to all bits in the configuration register except the MSb, which is a reserved read-only
bit. The entire register is volatile, and thus powers up in
its default state.
Figure 4. OS Output Operation Example
Figure 5. Configuration Register
IN THIS EXAMPLE THE DS75LV
IS CONFIGURED TO HAVE A FAULT
TOLERANCE OF 2.
OS OUTPUT - COMPARATOR MODE
CONVERSIONS
INACTIVE
ACTIVE
TEMPERATURE
TOS
THYST
INACTIVE
ACTIVE
OS OUTPUT - INTERRUPT MODE
ASSUMES A READ
HAS OCCURRED
MSbBIT 6BIT 5BIT 4BIT 3BIT 2BIT 1LSbR1R0F1F0POLTMSD
DS75LVDigital Thermometer and Thermostat

Partno	Mfg	Dc	Qty	Available	Descript
DS75LVU+	MAXIM	N/a	1500	avai	Digital Thermometer and Thermostat