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PDF MAX6626 Data sheet ( Hoja de datos )
| Número de pieza | MAX6626 | |
| Descripción | 9-Bit/12-Bit Temperature Sensors with I2C-Compatible Serial Interface in a SOT23 | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1841; Rev 2; 7/02
9-Bit/12-Bit Temperature Sensors with
I2C-Compatible Serial Interface in a SOT23
General Description
The 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.
Applications
Fan Control
Temperature Alarms
System Temperature Control
Industrial Equipment
Features
o 9-Bit Temperature-to-Digital Converter (MAX6625)
o 12-Bit Temperature-to-Digital Converter (MAX6626)
o 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)
o 133ms Conversion Time
o I2C-Compatible Serial Interface
o Up to Four Devices on a Single Bus
o Versatile Alarm Output with Programmable Trip
Temperature and Hysteresis
o Low-Power Shutdown Mode
o Space-Saving 6-Pin SOT23 Package
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX6625PMUT-T* -55°C to +125°C 6 SOT23-6
MAX6625RMUT-T*
MAX6626PMUT-T*
-55°C to +125°C
-55°C to +125°C
6 SOT23-6
6 SOT23-6
MAX6626RMUT-T*
-55°C to +125°C 6 SOT23-6
*For device options, see Selector Guide at end of data sheet.
Requires special solder temperature profile described in the
Absolute Maximum Ratings section.
Typical Operating Circuit
0.1µF
VS
1k 1k
6
4
MAX6625
MAX6626
1
3
10k
(OMIT FOR MAX6625R
AND MAX6626R)
OT OUTPUT
SDA
TO I2C
SCL MASTER
52
TOP VIEW
Pin Configuration
SDA 1
6 VS
MAX6625
GND 2 MAX6626 5 ADD
SCL 3
4 OT
SOT23-6
I2C is a trademark of Philips Corp.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
9-Bit/12-Bit Temperature Sensors with
I2C-Compatible Serial Interface in a SOT23
Detailed Description
The 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 the
I2C-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 Operation
The 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.
Addressing
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), VS (address 1), SDA (address 2), or SCL
(address 3). Table 1 shows the full I2C-compatible
address for each state.
BANDGAP
REGISTER
REFERENCE
TEMP SIGNAL
ADC
TEMPERATURE REGISTER
ADDRESS
POINTER
REGISTER
THIGH REGISTER
TLOW REGISTER
CONFIGURATION REGISTER
SERIAL BUS INTERFACE
MAX6625
MAX6626
SET-POINT
COMPARATOR
FAULT
QUEUE
COUNTER
Figure 2. Functional Block Diagram
+Vs
MAX665_ R
ONLY
OT
GND
SDA
SCL
ADD
_______________________________________________________________________________________ 5
5 Page 
9-Bit/12-Bit Temperature Sensors with
I2C-Compatible Serial Interface in a SOT23
THIGH
DIE
TEMPERATURE
TLOW
OT
(COMPARATOR MODE)
OT
(INTERRUPT MODE)
*
TEMPERATURE RESPONSE
SHOWN WITH OT SET FOR
ACTIVE LOW
TIME
Figure 6. OT Alarm Output and Reset Diagram
drain, and the MAX6625R/MAX6626R output includes
an internal 35kΩ (typ) pullup resistor. Figure 6 shows
the OT alarm operation and reset details.
Fault Queue
A programmable fault queue on the MAX6625/
MAX6626 eliminates spurious alarm activity in noisy
environments. The queue sets the number of consecu-
tive out-of-tolerance temperature readings that must
occur before the OT alarm output is toggled. An out-of-
tolerance reading is above THIGH or below TLOW. The
fault queue depth defaults to one at power-up and may
be programmed to one, two, four, or six consecutive
conversions. Any time the conversion result is in toler-
ance, and OT is not asserted, the queue is cleared,
even if it contains some out-of-tolerance counts.
Additionally, the fault queue automatically clears at
power-up, in shutdown, or if a master writes to any of
the THIGH, TLOW, or configuration registers. Whenever
the fault queue is cleared, OT is deasserted.
For example, the fault queue is set to four, two consec-
utive out-of-tolerance readings have occurred, and the
master writes to the TLOW register. The fault queue is
cleared and begins to look for four new consecutive
out-of-tolerance conversions.
Comparator Mode
In comparator mode, OT is asserted when the number
of consecutive conversions exceeding the value in the
THIGH register is equal to the depth of the fault queue.
*
*
*THIS ASSUMES DEASSERTION OF OT BY A
MASTER THROUGH THE SERIAL INTERFACE.
SEE INTERRUPT MODE SECTION.
OT deasserts when the number of consecutive conver-
sions less than the value in the TLOW register is equal
to the depth of the fault queue. THIGH minus TLOW is
the effective hysteresis of the OT output.
For example, if THIGH is set to +100°C, TLOW is set to
+80°C, and the fault queue depth is set to four, OT will
not assert until four consecutive conversions exceed
+100°C. Then, OT will not deassert until four consecu-
tive conversions are less than +80°C.
Comparator mode allows autonomous clearing of an OT
fault without the intervention of a master and is ideal to
use for driving a cooling fan (Figure 7).
Interrupt Mode
In interrupt mode, the MAX6625/MAX6626 look for a
THIGH or a TLOW fault based on previous fault activity.
The OT pin asserts an alarm for an undertemperature
fault, as well as for an overtemperature fault, depending
on certain conditions. If the fault queue is cleared at
power-up, the IC looks for a THIGH fault. After a THIGH
fault, the IC looks for a TLOW fault. After a TLOW fault,
the IC looks for a THIGH fault, and it will bounce back
and forth if properly deasserted each time. Once either
fault has occurred, it remains active indefinitely until
deasserted by a read of any register, and the device
then begins to look for a fault of the opposite type. Also,
if the fault queue is cleared, OT is deasserted and the
IC once again looks for a THIGH fault. The activation of
any fault is subject to the depth of the fault queue.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX6626.PDF ] | |
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