MAX6634MSA+T Maxim Integrated Products, MAX6634MSA+T Datasheet - Page 7

• 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

Figure 3. SMBus Read Timing Diagram
Figure 4. ADC Conversion Timing Diagram
The Configuration register is 8 bits, read/write, and
contains the SMBus timeout disable bit, fault queue
enable bit, the temperature alarm output polarity select
bits, the interrupt mode select bit, and the shutdown
bit. Registers T
and contain the values that trigger ALERT. Register
T
which the temperature must rise or fall beyond T
T
Seven registers control the operation of the MAX6635
(Figure 7 and Tables 2 through 7). The Pointer register
is the first addressed and determines which of the other
six registers is acted upon. The other six are the
Temperature, Configuration, High-Temperature
(T
Temperature (T
The temperature value is stored as 12 bits plus a sign
bit, read only, and contains the latest temperature data.
The true register length is 16 bits, with the lower three
used as status bits. The digital temperature data con-
tained in the temperature 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, the temperature alarm output polarity select
bits, the interrupt mode select bit, and the shutdown
SMBCLK
SMBDATA
HYST
LOW
HIGH
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
, before ALERT deasserts.
is 16 bits, read/write, and contains the values by
t
), Low-Temperature (T
SU:STA
A
12-Bit Plus Sign Temperature Sensors with
MAX6633/MAX6634/MAX6635
0.25s ADC CONVERSION TIME
t
HD:STA
HIGH
MAX
Control Registers (MAX6635)
t
_______________________________________________________________________________________
LOW
), and Hysteresis (T
and T
B
SMBus/I
t
HIGH
LOW
t
SU:DAT
are 16 bits, read/write,
C
LOW
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
HYST
), Maximum
2
D
C-Compatible Serial Interface
CONVERSION PERIOD 0.5s
MAX6633/MAX6634/MAX6635
) registers.
HIGH
E
F
or
Figure 5. MAX6633 Functional Diagram
G
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLEAR PULSE
H
CONFIGURATION
12 BIT + SIGN
SMBus INTERFACE
I
J
ADC
V
CC
K
TEMPERATURE
L = STOP CONDITION, DATA
M = NEW START CONDITION
EXECUTED BY SLAVE
t
SU:STO
L
SDA
SCL
A0
A1
A2
A3
t
BUF
M
7