MAX6625 MAXIM [Maxim Integrated Products], MAX6625 Datasheet

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MAX6625

Manufacturer Part Number
MAX6625
Description
9-Bit/12-Bit Temperature Sensors with I2C-Compatible Serial Interface in a SOT23
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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The MAX6625/MAX6626 combine a temperature sensor,
a programmable overtemperature alarm, and an I
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 I
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.
19-1841; Rev 2; 7/02
I
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
2
C is a trademark of Philips Corp.
Fan Control
Temperature Alarms
System Temperature Control
Industrial Equipment
0.1µF
I
2
2
Typical Operating Circuit
C-Compatible Serial Interface in a SOT23
C-compatible interface. Four separate
5
________________________________________________________________ Maxim Integrated Products
MAX6625
MAX6626
V
S
6
2
General Description
9-Bit/12-Bit Temperature Sensors with
4
1
3
1k
1k
Applications
10k
(OMIT FOR MAX6625R
AND MAX6626R)
OT OUTPUT
SDA
SCL
TO I
MASTER
2
C
2
C™-
o 9-Bit Temperature-to-Digital Converter (MAX6625)
o 12-Bit Temperature-to-Digital Converter (MAX6626)
o Accuracy
o 133ms Conversion Time
o I
o Up to Four Devices on a Single Bus
o Versatile Alarm Output with Programmable Trip
o Low-Power Shutdown Mode
o Space-Saving 6-Pin SOT23 Package
*For device options, see Selector Guide at end of data sheet.
Requires special solder temperature profile described in the
Absolute Maximum Ratings section.
M A X6 6 2 5 P M U T - T *
MAX6625RMUT-T*
M A X6 6 2 6 P M U T - T *
MAX6626RMUT-T*
Temperature and Hysteresis
2
TOP VIEW
C-Compatible Serial Interface
±1°C (T
±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)
PART
A
= +25°C)
GND
SDA
SCL
1
2
3
Ordering Information
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
TEMP. RANGE
SOT23-6
MAX6625
MAX6626
Pin Configuration
6
5
4
V
ADD
OT
S
Features
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
1

Related parts for MAX6625

MAX6625 Summary of contents

Page 1

... 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 ...

Page 2

... MAX6626 MAX6625 MAX6626 T = +25° +3V to +3. ≤ +50°C, V 0° +3.0V to +3. ≤ +70°C, V 0° +3.0V to +3. +3V to +5. MAX6625R, MAX6626R only 4mA L OUT (Programmable through fault queue) V < +3. > +3. MIN TYP MAX UNITS 3 5 ...

Page 3

... Note 2: Guaranteed by design and characterization to ±5 sigma. 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 Considerations section. 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’ ...

Page 4

Temperature Sensors with 2 I C-Compatible Serial Interface in a SOT23 (V = +3.3V +25°C, unless otherwise noted RESPONSE TO THERMAL SHOCK TEMPERATURE vs. TIME 100 DEVICE IMMERSED IN +85°C FLUORINERT ...

Page 5

... I 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/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), V (address 3) ...

Page 6

Temperature Sensors with 2 I C-Compatible Serial Interface in a SOT23 2 -Compatible Figure Timing Diagram 6 _______________________________________________________________________________________ ...

Page 7

Temperature Sensors with 2 I C-Compatible Serial Interface in a SOT23 2 -Compatible Figure Timing Diagram _______________________________________________________________________________________ 7 ...

Page 8

... HIGH isters. The temperature register is 9 bits for the MAX6625 and 12 bits for the MAX6626, read only, and contains the latest temperature data. The register length is 16 bits with the unused bits masked to 0. The digital temperature data contained in the temperature register is in ° ...

Page 9

... D13 MSB MAX6625 Bit 7 Bit 6 (Sign) MSB Bit Bit MAX6625 (Sign D0, MAX6625: Will read all zeros, cannot be written D0, MAX6626: Will read all zeros, cannot be written. D15: MSB is the sign bit. Table 5. Configuration Register Fault Comparator OT ...

Page 10

... D10 Bit 3 Bit 2 Bit 1 LSB 0 DIGITAL OUTPUT CODE MAX6625 HEX LSB MSB 7D00 0111 1101 0000 0000 7C80 0111 1100 1111 0000 1900 0001 1001 0000 0000 0080 0000 0000 1000 0000 0000 0000 0000 0000 0000 ...

Page 11

... Comparator mode allows autonomous clearing below T . The LOW fault without the intervention of a master and is ideal to use for driving a cooling fan (Figure 7). In interrupt mode, the MAX6625/MAX6626 look for HIGH The OT pin asserts an alarm for an undertemperature fault, as well as for an overtemperature fault, depending on certain conditions ...

Page 12

... MAX6625/MAX6626 sink 4mA with the maximum OT V spec of 0.8V, an additional 3.2mW of power is dissipat- ed within the IC. This corresponds to a 0.35°C rise in the die temperature. Figure 7 shows the MAX6625/MAX6626 used as a tem- perature-triggered fan controller. Figure 8 shows the MAX6625/MAX6626 used as a thermostat to control a heating element. ...

Page 13

... Selector Guide ALARM PART OUTPUT Open Drain MAX6625RMUT Internal Pullup Open Drain MAX6626RMUT Internal Pullup (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www ...

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