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Temperature Sensor and
System Monitor in a 10-Pin μMAX
Table 1. Register Map
ADDRESS
20h
21h
22h
23h
27h
2Bh
2Ch
2Dh
2Eh
2Fh
30h
31h
32h
39h
3Ah
40h
41h
43h
READ/WRITE
R
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
POWER-ON DEFAULT
—
—
—
—
—
1101 0011 (1.1 × 2.5V)
1010 1101 (0.9 × 2.5V)
1101 0011 (1.1 × 1.8V)
1010 1101 (0.9 × 1.8V)
1101 0011 (1.1 × 5V)
1010 1101 (0.9 × 5V)
1101 0011 (1.1 × 3.3V)
1010 1101 (0.9 × 3.3V)
0101 0000 (+80°C)
0100 0001 (+65°C)
0000 1000
0000 0000
0000 0000
DESCRIPTION
Data register for 2.5 V IN measurement
Data register for 1.8V IN measurement
Data register for 5V IN measurement
Data register for V CC measurement
Data register for temperature measurement
High limit for 2.5V IN
Low limit for 2.5V IN
High limit for 1.8V IN
Low limit for 1.8V IN
High limit for 5V IN
Low limit for 5V IN
High limit for V CC
Low limit for V CC
Hot temperature limit
Hot temperature hysteresis
Configuration Register
Interrupt Status Register
Interrupt Mask Register
Device Address Register. The values of XX are
dependent on the status of the ADD pin.
Power-On Default ADD Connection
0010 100Y To GND
48h
R/W
0010 1XXY
0010 101Y To V CC
0010 110Y To SDA
0010 111Y To SCL
Y (bit 0) is the SMBus read/write bit. When the 7-bit chip
address is read back from the Serial Address Register,
an 8-bit word is presented with a zero in bit 0 (Y).
4Bh
R/W
0000 0000
Temperature Configuration Register
Unless the fault is removed, the ALERT output only
remains cleared until the end of the next conversion
cycle where it is again asserted. The ALERT output can
also be masked by writing to the appropriate bits in the
Interrupt Mask Register (Table 6) or by setting bit 1 of
the Configuration Register (Table 4) to zero.
The 2-wire serial interface accepts both I 2 C and stan-
dard SMBus Write Byte, Read Byte, Read Word, Send
Byte, and Receive Byte commands to program the
alarm thresholds and to read voltage and temperature
data. Voltage data is scaled so that when the nominal
voltage is present at an input (e.g., 1.8V for the 1.8V IN
input), the conversion result is equal to 3/4 of the ADC
full-scale range or a decimal count of 192 (Table 1).
When using the Read Byte command, the temperature
data format is 7 bits plus sign with the LSB equal to
1°C, in two's complement format. When using the Read
Word command, the temperature data format is 10 bits
plus sign, with the LSB equal to 0.125°C, in two’s com-
plement format. See Table 2 for the temperature data
format.
The MAX6683 has only one address input, ADD.
Connect ADD to GND, V CC , SDA, or SCL to select one
of four different address codes. Whenever an
SMBus/I 2 C transaction is initiated, the 2LSBs of the
Slave Address Register are determined by connection,
setting the chip address to one of four possible values.
In addition, an address code can also be directly writ-
6
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