MAX6652AUB+T【PDF 5/12 页】IC TEMP SENS/MON 10-UMAX

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Detailed Description

The MAX6652 is a voltage and temperature monitor

designed to communicate through an I

C-compatible/

SMBus interface with an external microcontroller (礐).

A 礐 with no built-in I

C-compatible or SMBus capabili-

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-

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 ADCs 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.

Temperature Sensor and System Monitor

in a 10-Pin 礛AX

_______________________________________________________________________________________ 5

ADDRESS

READ/WRITE

POWER-ON DEFAULT

DESCRIPTION

20h

Data register for 2.5 V

measurement

21h

Data register for 12V

measurement

22h

Data register for 3.3V

measurement

23h

Data register for V

measurement

27h

Data register for temperature measurement

2Bh

R/W

1101 0011 (1.1

2.5V)

High limit for 2.5V

2Ch

R/W

1010 1101 (0.9 2.5V)

Low limit for 2.5V

2Dh

R/W

1101 0011 (1.1 12V)

High limit for 12V

2Eh

R/W

1010 1101 (0.9

12V)

Low limit for 12V

2Fh

R/W

1101 0011 (1.1

3.3V)

High limit for 3.3V

30h

R/W

1010 1101 (0.9

3.3V)

Low limit for 3.3V

31h

R/W

1101 0011 (1.1 5V)

High limit for V

32h

R/W

1010 1101

(0.9

5V)

Low limit for V

39h

R/W

0101 0000

(+80癈)

Hot temperature limit

3Ah

R/W

0100 0001 (+65癈)

Hot temperature hysteresis

40h

R/W

0000 1000

Configuration register

41h

0000 0000

Interrupt status register

43h

R/W

0000 0000

Interrupt mask register

48h

R/W

0010 1XXY

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

0010 101Y To V

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 will be presented

with a 0 in bit 0 (Y).

4Bh

R/W

0000 0000

Temperature configuration register

Table 1. Register Map

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