MAX6625RMUT-T ,9-Bit/12-Bit Temperature Sensors with I2C-Compatible Serial Interface in a SOT23ApplicationsM A X6 62 6 P M UT - T * -55°C to +125°C 6 SOT23-6Fan ControlMAX6626RMUT-T* -55°C to + ..
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MAX6625RMUT-T
9-Bit/12-Bit Temperature Sensors with I2C-Compatible Serial Interface in a SOT23
General DescriptionThe MAX6625/MAX6626 combine a temperature sensor,
a programmable overtemperature alarm, and an I2C™-
compatible serial interface into single compact packages.
They convert their die temperatures into digital values
using internal analog-to-digital converters (ADCs). The
result of the conversion is held in a temperature register,
readable at any time through the serial interface. A dedi-
cated alarm output, OT, activates if the conversion result
exceeds the value programmed in the high-temperature
register. A programmable fault queue sets the number of
faults that must occur before the alarm activates, prevent-
ing spurious alarms in noisy environments. OT has pro-
grammable output polarity and operating modes.
The MAX6625/MAX6626 feature a shutdown mode that
saves power by turning off everything but the power-on
reset and the I2C-compatible interface. Four separate
addresses can be configured with the ADD pin, allowing
up to four MAX6625/MAX6626 devices to be placed on
the same bus. The MAX6625P/MAX6626P OT outputs are
open drain, and the MAX6625R/MAX6626R OT outputs
include internal pullup resistors.
The MAX6625 has a 9-bit internal ADC and can function
as a replacement for the LM75 in most applications. The
MAX6626 has a 12-bit internal ADC. Both devices come
in the space-saving 6-pin SOT23 package.
ApplicationsFan Control
Temperature Alarms
System Temperature Control
Industrial Equipment
Features9-Bit Temperature-to-Digital Converter (MAX6625)12-Bit Temperature-to-Digital Converter (MAX6626)Accuracy
±1°C (TA= +25°C)
±1.5°C (0°C to +50°C)
±2°C (0°C to +70°C)
±3°C (-40°C to +85°C)
±4°C (-55°C to +125°C)133ms Conversion TimeI2C-Compatible Serial InterfaceUp to Four Devices on a Single BusVersatile Alarm Output with Programmable Trip
Temperature and HysteresisLow-Power Shutdown ModeSpace-Saving 6-Pin SOT23 Package
MAX6625/MAX6626
9-Bit/12-Bit Temperature Sensors with 2C-Compatible Serial Interface in a SOT23
Pin Configurationypical Operating Circuit19-1841; Rev 2; 7/02
*For device options, see Selector Guide at end of data sheet. Requires special solder temperature profile described in the
Absolute Maximum Ratings section.
Ordering InformationI2C is a trademark of Philips Corp.
MAX6625/MAX6626
9-Bit/12-Bit Temperature Sensors with 2C-Compatible Serial Interface in a SOT23
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(+3V ≤VS≤+5.5V, TA = -55°C to +125°C, unless otherwise noted.)
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.to GND................................................................-0.3V to +6V
OT, SCL, SDA to GND.............................................-0.3V to +6V
ADD to GND.................................................-0.3V to (VS+ 0.3V)
Current into Any Pin............................................................±5mA
OT Sink Current..................................................................20mA
Continuous Power Dissipation
6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature.............................................................Note 1
ESD Rating (Human Body Model)......................................2000V
Note 1:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, IPC/JEDEC J-STD-020A, paragraph 7.6, Table 3 for IR/VPR and Convection
Reflow. Preheating is required. Hand or wave soldering is not allowed.
MAX6625/MAX6626
9-Bit/12-Bit Temperature Sensors with 2C-Compatible Serial Interface in a SOT23
ELECTRICAL CHARACTERISTICS (continued)(+3V ≤VS≤+5.5V, TA = -55°C to +125°C, unless otherwise noted.)
Note 3:Quantization error not included in specifications for temperature accuracy.
Note 4:Output current should be minimized for best temperature accuracy. Power dissipation within the MAX6625/MAX6626 will
cause self-heating and temperature drift; see Thermal Considerationssection.
Note 5:A master device must provide a hold time of at least 300ns for the SDA signal in order to bridge the undefined region of
SCL’s falling edge.
Note 6:CB= total capacitance of one bus line in pF. Tested with CB= 400pF.
Note 7:Input filters on SDA, SCL, and ADD suppress noise spikes less than 50ns.
MAX6625/MAX6626
9-Bit/12-Bit Temperature Sensors with 2C-Compatible Serial Interface in a SOT23
Typical Operating Characteristics(VS = +3.3V, TA = +25°C, unless otherwise noted.)
MAX6625/MAX6626
9-Bit/12-Bit Temperature Sensors with 2C-Compatible Serial Interface in a SOT23
Detailed DescriptionThe MAX6625/MAX6626 continuously convert their die
temperatures into digital values using their self-con-
tained delta-sigma ADCs. The resulting data is read-
able at any time through the I2C-compatible serial
interface. A dedicated alarm output asserts if the result
exceeds the value in the programmable high-tempera-
ture register. A programmable fault queue sets the
number of faults that must occur before the alarm
asserts, preventing spurious alarms in noisy environ-
ments. The alarm output polarity is selectable and
deasserts based on either of two operating modes,
comparator or interrupt. In comparator mode, the OT
output deasserts if the temperature conversion result
falls below the programmable low-temperature register
value (subject to the fault queue conditions) providing
adjustable hysteresis. In interrupt mode, the OT output
deasserts when any register is read through the serial
interface. Each conversion cycle takes about 130ms. At
power-up, the temperature register is set to 8000H until
the first conversion is completed.
The MAX6625/MAX6626 feature a shutdown mode,
accessible through the serial interface, that saves power
by turning off everything but the power-on reset and the2C-compatible interface. While in shutdown mode the
temperature register is set to 8000H. The device func-
tions as a slave on the I2C-compatible bus supporting
Write Byte, Write Word, Read Byte, and Read Word com-
mands. Four separate addresses can be configured with
the ADD pin, allowing up to four MAX6625/MAX6626
devices to be placed on the same bus. Figure 2 shows
the functional block diagram of the MAX6625/MAX6626.
Serial interface
I2C-Compatible OperationThe MAX6625/MAX6626 are readable and programma-
ble through their I2C-compatible serial interface.
Figures 3 and 4 show the timing details of the clock
(SCL) and data (SDA) signals. The device functions as
a slave on the I2C-compatible bus and supports Write
Byte, Write Word, Read Byte, and Read Word com-
mands.
AddressingFour separate addresses can be configured with the
ADD pin, allowing up to four MAX6625/MAX6626s to be
placed on the same bus. The address is selected by
connecting the ADD pin to either of four places: GND
(address 0), VS(address 1), SDA (address 2), or SCL
(address 3). Table 1 shows the full I2C-compatible
address for each state.
Figure 2. Functional Block Diagram
