MAX6634MSA+T Maxim Integrated Products, MAX6634MSA+T Datasheet - Page 5

• Manufacturer Part Number: MAX6634MSA+T
• Description: IC TEMP SENSOR SMBUS 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX6634MSA+T

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 150°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -55°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Full Temp Accuracy: +/- 2.5 C
• Digital Output - Bus Interface: Serial (3-Wire, I2C)
• Digital Output - Number Of Bits: 12 bit + Sign
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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/I
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.
The MAX6633/MAX6634/MAX6635 are readable and
programmable through their SMBus/I
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.
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 V
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
MAX6633
—
—
1
2
3
4
5
6
7
8
12-Bit Plus Sign Temperature Sensors with
SMBus/I
MAX6634
PIN
_______________________________________________________________________________________
—
—
1
2
4
5
6
7
8
3
SMBus/I
Detailed Description
2
C-Compatible Operation
2
CC
C-compatible serial interface.
MAX6635
. The MAX6635 makes two
—
—
1
2
4
6
7
8
5
3
2
Addressing
C-compatible
2
C-Compatible Serial Interface
OVERT
ALERT
NAME
GND
SDA
SCL
V
A3
A2
A1
A0
CC
devices to be connected to a single bus line. Table 1
shows the full SMBus/I
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.
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
(T
(T
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.
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 V
with a 0.1µF capacitor.
ALERT Output. Open drain.
OVERT Output. Open drain.
HYST
HIGH
) registers. The temperature value is stored as
), Low-Temperature (T
Control Registers (MAX6633)
Control Registers (MAX6634)
2
FUNCTION
C address for each device type.
Pin Description
LOW
), and Hysteresis
CC
to GND
5