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12-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
Table 2. Command Codes for the
Temperature Limit Registers
The first bit of the command byte is always high to sig-
nify a Start, and the second bit is an R/ W bit, high for
read and low for write. There are a total of 11 valid
COMMAND
C1h
C3h
C5h
C7h
C9h
CBh
83h
85h
87h
89h
8Bh
DESCRIPTION
Temperature register read
Configuration register read
T HYST register read
T MAX register read
T LOW register read
T HIGH register read
Configuration register write
T HYST register write
T MAX register write
T LOW register write
T HIGH register write
commands. The temperature conversion runs continu-
ously and asynchronously from the serial interface.
When the Temperature register is read, any conversion
in progress is aborted and the data output is from the
previous conversion. A new conversion is started each
time the serial interface is accessed.
MAX6662 Registers
The MAX6662 has six registers: Temperature, Configura-
tion, T HYST , T MAX , T LOW , and T HIGH registers. They are
all 16 bits (Figure 5). The Temperature register is read
only; all other registers can be read from or written to.
Temperature Register
The MSB of the Temperature register is the sign bit. The
next 12 bits are temperature data. The digital tempera-
ture data for the most recent temperature conversion is
TEMPERATURE REGISTER (COMMAND = C1H)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Label
Sign
Bit
Data
MSB
Data T OVER T HIGH T LOW
LSB Flag Flag Flag
POR
State
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CONFIGURATION REGISTER (COMMAND = C3H FOR READING; COMMAND = 83H FOR WRITING)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Label
*
*
*
Fault
Queue
ALERT
Polarity
OT
Polarity
Interrupt Shutdown
Mode Mode
*
*
*
*
*
*
*
*
POR
State
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
TEMPERATURE LIMIT REGISTERS (T HYST , T MAX , T LOW , T HIGH ) (TABLE 2)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Label
Sign
Data
MSB
Data
LSB
*
*
*
*
*
*
*
POR
State
* Reserved (not used). Writing to this bit is ignored.
** THYST register: 0000 0001 0000 0000b (2°C)
** TMAX register: 0010 1000 0000 0000b (+80°C)
** TLOW register: 0000 0101 0000 0000b (+10°C)
** THIGH register: 0010 0000 0000 0000b (+64°C)
Figure 5. Bit Assignment for the MAX6662 Registers
**
_______________________________________________________________________________________
7
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