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