MAX6662MSA+T Maxim Integrated Products, MAX6662MSA+T Datasheet - Page 7

• Manufacturer Part Number: MAX6662MSA+T
• Description: IC TEMP SENSOR SPI 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX6662MSA+T

• Function: Temp Sensor, Watchdog
• Topology: ADC, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 150°C
• Output Type: SPI™
• Output Alarm: Yes
• Output Fan: No
• 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, SPI)
• 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

Table 2. Command Codes for the
Temperature Limit Registers
Figure 5. Bit Assignment for the MAX6662 Registers
COMMAND
* Reserved (not used). Writing to this bit is ignored.
** T HYST register: 0000 0001 0000 0000b (2°C)
** T MAX register: 0010 1000 0000 0000b (+80°C)
** T LOW register: 0000 0101 0000 0000b (+10°C)
** T HIGH register: 0010 0000 0000 0000b (+64°C)
Label
Label
State
State
Label
State
POR
POR
POR
CBh
C1h
C3h
C5h
C7h
C9h
8Bh
83h
85h
87h
89h
Sign
CONFIGURATION REGISTER (COMMAND = C3H FOR READING; COMMAND = 83H FOR WRITING)
Sign
15
15
Bit
15
0
*
0
_______________________________________________________________________________________
14
Data
MSB
Data
MSB
0
*
Temperature register read
Configuration register read
T
T
T
T
Configuration register write
T
T
T
T
14
14
0
HYST
MAX
LOW
HIGH
HYST
MAX
LOW
HIGH
12-Bit + Sign Temperature Sensor with
TEMPERATURE LIMIT REGISTERS (T
13
register read
register write
0
register read
register write
*
register read
register read
register write
register write
13
13
0
Queue
DESCRIPTION
Fault
12
0
12
12
0
TEMPERATURE REGISTER (COMMAND = C1H)
11
11
Polarity
SPI-Compatible Serial Interface
0
ALERT
11
0
10
10
0
Polarity
OT
10
0
9
0
9
Interrupt
HYST
8
0
8
Mode
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
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.
The MAX6662 has six registers: Temperature, Configura-
tion, T
all 16 bits (Figure 5). The Temperature register is read
only; all other registers can be read from or written to.
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
9
0
**
, T
Data
LSB
7
0
7
MAX
HYST
Shutdown
Mode
, T
8
0
6
0
LOW
6
*
, T
MAX
, T
HIGH
5
0
5
*
7
0
*
, T
LOW
) (TABLE 2)
6
0
*
4
4
0
*
, and T
5
0
*
Data
LSB
3
0
3
*
MAX6662 Registers
4
0
*
HIGH
Temperature Register
T
Flag
OVER
3
0
*
2
0
2
*
registers. They are
T
2
0
*
Flag
HIGH
1
1
0
*
1
0
*
T
Flag
LOW
0
0
0
*
0
0
*
7