MAX6652 MAXIM [Maxim Integrated Products], MAX6652 Datasheet - Page 5

• Manufacturer Part Number: MAX6652
• Description: Temperature Sensor and System Monitor in a 10-Pin UMAX
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX6652 is a voltage and temperature monitor
designed to communicate through an I
SMBus interface with an external microcontroller (µC).
A µC with no built-in I
ties can generate SMBus serial commands by “bit-
banging” general-purpose input-output (GPIO) pins.
The MAX6652 can monitor external supply voltages of typi-
cally 2.5V, 3.3V, and 12V, as well as its own supply voltage
and temperature. This makes it ideal for supervisor and
thermal management applications in telecommunications,
desktop and notebook computers, workstations, and net-
Table 1. Register Map
ADDRESS
2Bh
2Ch
2Dh
2Eh
3Ah
4Bh
20h
21h
22h
23h
27h
2Fh
30h
31h
32h
39h
40h
41h
43h
48h
Temperature Sensor and System Monitor
_______________________________________________________________________________________
READ/WRITE
2
Detailed Description
C-compatible or SMBus capabili-
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
1101 0011 (1.1
1010 1101 (0.9
1101 0011 (1.1
1010 1101 (0.9
1101 0011 (1.1
1010 1101 (0.9
1101 0011 (1.1
1010 1101
0101 0000
0100 0001
0000 1000
0000 0000
0000 0000
0010 1XXY
0000 0000
POWER-ON DEFAULT
2
C-compatible/
✕
✕
✕
—
—
—
—
—
(0.9
(+80°C)
(+65°C)
✕
✕
✕
✕
✕
✕
✕
2.5V)
2.5V)
12V)
12V)
3.3V)
3.3V)
5V)
✕
5V)
working equipment. All inputs are converted to an 8-bit
code using an ADC with an oversampling ratio of 8 to
improve noise rejection. The oversampling ratio can be
reduced by a factor of 4, with a corresponding reduc-
tion in the monitoring cycle time, by setting bit 5 of the
configuration register to 1. Each input voltage is scaled
down by an on-chip resistive divider so that its output,
at the nominal input voltage, is 3/4 of the ADC’s full-
scale range, or a decimal count of 192 (Table 3). Table
1 is the register map and Table 2 is the temperature
data format.
Data register for 2.5 V
Data register for 12V
Data register for 3.3V
Data register for V
Data register for temperature measurement
High limit for 2.5V
Low limit for 2.5V
High limit for 12V
Low limit for 12V
High limit for 3.3V
Low limit for 3.3V
High limit for V
Low limit for V
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
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 will be presented
with a 0 in bit 0 (Y).
Temperature configuration register
0010 100Y
0010 101Y
0010 110Y
0010 111Y
in a 10-Pin µMAX
CC
CC
IN
IN
IN
IN
IN
IN
CC
DESCRIPTION
IN
measurement
IN
IN
To GND
To V
To SDA
To SCL
measurement
measurement
measurement
CC
5