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PDF MAX6635 Data sheet ( Hoja de datos )
| Número de pieza | MAX6635 | |
| Descripción | (MAX6633 - MAX6635) 12-Bit Plus Sign Temperature Sensors | |
| Fabricantes | Maxim Integrated Products | |
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19-2120; Rev 0; 8/01
12-Bit Plus Sign Temperature Sensors with
SMBus/I2C-Compatible Serial Interface
General Description
The MAX6633/MAX6634/MAX6635 combine a tempera-
ture sensor, a programmable overtemperature alarm,
and an SMBus™/I2C™-compatible serial interface into
a single package. They convert their die temperatures
into digital values using internal analog-to-digital con-
verters (ADCs). The result of the conversion is then held
in a temperature register as a 12-bit + sign value, allow-
ing 0.0625°C resolution, readable at any time through
the serial interface. The devices are capable of reading
temperatures up to +150°C.
The MAX6633/MAX6634/MAX6635 feature a shutdown
mode that saves power by turning off everything except
the power-on reset (POR) and the serial interface. The
devices can be configured to separate addresses,
allowing multiple devices to be used on the same bus.
The MAX6633 has four address pins, allowing up to 16
devices to be connected to a single bus. The MAX6634
has three address pins, allowing up to eight devices to
be connected to a single bus. The MAX6635 has two
address pins, allowing up to four devices to be con-
nected to a single bus.
The MAX6633/MAX6634/MAX6635 make temperature
data available for transfer over the serial interface. The
MAX6634 incorporates a dual-mode ALERT output
(open drain) and can serve as an upgraded alternative
to the LM75. The MAX6635 includes an ALERT output
and an OVERT output (both open drain) and can func-
tion as an upgraded replacement for the LM76 in most
applications. The MAX6634/MAX6635 feature user-pro-
grammable temperature thresholds. All three devices
come in an 8-pin SO package.
Applications
Battery Temperature Alarms
PC Temperature Control
Automotive Equipment
Pin Configurations appear at end of data sheet.
SMBus is a trademark of Intel Corp.
I2C is a trademark of Philips Corp.
Features
o +3V to +5.5V Supply Range
o Accuracy
±1°C max (0°C to +50°C)
±1.5°C max (-20°C to +85°C)
±2.5°C max (-40°C to +125°C)
±2.5°C typ (+150°C)
o User-Programmable Temperature Thresholds
(MAX6634/MAX6635)
o User-Configurable Alarm Output(s)
(MAX6634/MAX6635)
o Ability to Respond to SMBus/I2C-Compatible Alert
Response Address (MAX6634/MAX6635)
o OVERT Output for System Shutdown (MAX6635)
o Multiple Devices per Bus
16 devices (MAX6633)
8 devices (MAX6634)
4 devices (MAX6635)
Ordering Information
PART
MAX6633MSA
MAX6634MSA
MAX6635MSA
TEMP. RANGE
-55°C to +150°C
-55°C to +150°C
-55°C to +150°C
PIN-PACKAGE
8 SO
8 SO
8 SO
Typical Operating Circuit
VCC
0.1µF +3.0V TO +5.5V
8
VCC
10kΩ 1kΩ 1kΩ 10kΩ
ALERT 5
MAX6635 SDA 1
SCL 2
3
OVERT
A0 A1 GND
76 4
TO INTERRUPT
CONTROLLER
TO SMBus/I2C
MASTER
TO SYSTEM
SHUTDOWN
________________________________________________________________ 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  
12-Bit Plus Sign Temperature Sensors with
SMBus/I2C-Compatible Serial Interface
MAX6633
1
2
3
4
5
6
7
8
—
—
PIN
MAX6634
1
2
—
4
5
6
7
8
3
—
MAX6635
1
2
—
4
—
6
7
8
5
3
NAME
SDA
SCL
A3
GND
A2
A1
A0
VCC
ALERT
OVERT
Pin Description
FUNCTION
Serial Data Input/Output. Open drain.
Serial Clock Input
Address Pin
Ground
Address Pin
Address Pin
Address Pin
Supply Voltage Input. +3.0V to +5.5V. Bypass VCC to GND
with a 0.1µF capacitor.
ALERT Output. Open drain.
OVERT Output. Open drain.
Detailed Description
The MAX6633/MAX6634/MAX6635 continuously con-
vert their die temperatures into digital values using their
integrated ADCs. The resulting data is readable at any
time through the SMBus/I2C-compatible serial interface.
The device functions as a slave on the SMBus inter-
face, supporting Write Byte, Write Word, Read Byte,
and Read Word commands. Separate addresses can
be configured using the individual address pins.
Figures 5, 6, and 7 show the functional diagrams of the
MAX6633/MAX6634/MAX6635, respectively.
SMBus/I2C-Compatible Operation
The MAX6633/MAX6634/MAX6635 are readable and
programmable through their SMBus/I2C-compatible
serial interface. Figures 1, 2, and 3 show the timing
details of the clock (SCL) and data (SDA) signals. The
devices function as slaves on the SMBus and support
Write Byte, Write Word, Read Byte, and Read Word
commands. Figure 8 is the MAX6633/MAX6634/
MAX6635 programmer’s model.
Addressing
Separate addresses can be configured using the indi-
vidual address pins. The address of each device is
selected by connecting the address (A_) pins to one of
two potentials: GND or VCC. The MAX6635 makes two
address pins available (A0, A1), allowing up to four
devices to be connected to a single bus line. The
MAX6634 makes three address pins available (A0, A1,
A2), allowing up to eight devices to be connected to a
single bus line. The MAX6633 makes four address pins
available (A0, A1, A2, A3), allowing as many as 16
devices to be connected to a single bus line. Table 1
shows the full SMBus/I2C address for each device type.
Control Registers (MAX6633)
Three registers control the operation of the MAX6633
(Figure 5 and Tables 2 through 6). The Pointer register
is the first addressed and determines which of the other
two registers is acted upon. The other two are the
Temperature and Configuration registers. The tempera-
ture value is stored as 12 bits plus a sign bit, read only,
and contains the latest temperature data. The true reg-
ister length is 16 bits, with the lower 3 unused in this
part. The digital temperature data contained in the tem-
perature register is in °C, using a two’s-complement
format with 1LSB corresponding to 0.0625°C.
The Configuration register is 8 bits, read/write, and
contains the SMBus timeout disable bit, fault queue
enable bit, and the shutdown bit.
Control Registers (MAX6634)
Six registers control the operation of the MAX6634
(Figure 6 and Tables 2 through 7). The pointer register
is the first addressed and determines which of the other
five registers is acted upon. The other five are the
Temperature, Configuration, High-Temperature
(THIGH), Low-Temperature (TLOW), and Hysteresis
(THYST) registers. The temperature value is stored as
12 bits plus a sign bit, read only, and contains the lat-
est temperature data. The true register length is 16 bits,
with the lowest 2 used as status bits, and the third bit
(D2) is unused. The digital temperature data contained
in the temperature register is in °C, using a two’s-com-
plement format with 1LSB corresponding to 0.0625°C.
_______________________________________________________________________________________ 5
5 Page 
12-Bit Plus Sign Temperature Sensors with
SMBus/I2C-Compatible Serial Interface
VCC
+3V TO +5.5V
8
4kΩ
MAX6634
ALERT 3
4
HEATER
RELAY
5VDC, 20mA
125VAC, 1A
2N3904
HEATER
SUPPLY
VCC
+3V TO +5.5V
8
10kΩ
3
OVERT
+12V
FAN 12V 300mA
MOTOR
LOGIC-LEVEL
MOSFET
MAX6635
4
Figure 10. Simple Thermostat
Figure 11. Fan Controller
Temperature Alert
(MAX6634/MAX6635)
ALERT has programmable polarity and two modes:
comparator and interrupt. Polarity and mode are select-
ed through the Configuration register (Table 4). The
ALERT output is open drain.
Interrupt Mode
With ALERT in interrupt mode, the MAX6634/MAX6635
look for a THIGH or a TLOW fault. The ALERT pin asserts
an alarm for an undertemperature fault, as well as for
an overtemperature fault. Once either fault has
occurred, it remains active until deasserted by a read
of any register. The device then begins to look for a
temperature change crossing the hysteresis level. The
activation of ALERT is subject to the depth of the fault
queue.
For example: If THIGH is set to 100°C, THYST is set to
20°C, and the fault queue depth is set to 4, ALERT
does not assert until four consecutive conversions
exceed 100°C. If the temperature is then read through
the I2C-compatible interface, ALERT deasserts. ALERT
asserts again when four consecutive conversions are
less than 80°C.
Comparator Mode
In comparator mode, ALERT is asserted when the num-
ber of consecutive conversions exceeding the value in
the THIGH register, or lower than the value in the TLOW
register, is equal to the depth of the fault queue. ALERT
deasserts when the number of consecutive conversions
less than THIGH - THYST or greater than TLOW + THYST
is equal to the depth of the fault queue.
For example: If THIGH is set to 100°C, TLOW is set to
80°C, and the fault queue depth is set to four, ALERT
does not assert until four consecutive conversions
exceed 100°C, or are below 80°C. ALERT only
deasserts if four consecutive conversions are less than
THIGH - THYST or greater than TLOW + THYST.
Comparator mode allows autonomous clearing of an
ALERT fault without the intervention of a master and is
ideal to use for driving a thermostat (Figure 10).
Overtemperature Alarm (MAX6635)
The MAX6635 also includes an overtemperature output
that is always in comparator mode. Whenever the tem-
perature exceeds a value in the programmable TMAX
register, OVERT is asserted. OVERT only deasserts
after the temperature drops below TMAX - THYST. When
the fault queue is activated, OVERT is subject to that
queue, which sets the number of faults that must occur
before OVERT asserts or deasserts. This helps prevent
spurious alarms in noisy environments.
Comparator mode also allows autonomous clearing of
an OVERT fault without the intervention of a master and
thus is ideal to use for driving a cooling fan (Figure 11).
In this application, the polarity of OVERT is active high.
Shutdown
The MAX6633/MAX6634/MAX6635 feature a shutdown
mode, accessible through the serial interface that
saves power by turning off everything except the POR
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX6635.PDF ] | |
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