Rainbow-electronics MAX6652 User Manual download pdf

General Description

The MAX6652 system supervisor monitors multiple

power-supply voltages, including its own, and also fea-

tures an on-board temperature sensor. Voltages and

temperature are converted to an 8-bit code using an

analog-to-digital converter (ADC). A multiplexer automat-

ically sequences through the voltage and temperature

measurements. The digitized signals are then stored in

registers and compared to the over/under threshold lim-

its programmed over the 2-wire serial interface.

When a temperature measurement exceeds the pro-

grammed threshold, or when an input voltage falls out-

side the programmed voltage limits, the MAX6652

generates a latched interrupt output ALERT. Three inter-

rupt modes are available for temperature excursions:

default mode, one-time interrupt mode, and comparator

mode. The ALERT output is cleared, except for tempera-

ture interrupts generated in comparator mode, by read-

ing the interrupt status register (Table 5). 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 0. The

MAX6652 I

™

-compatible/SMBus interface also

responds to the SMB alert response address.

The 2-wire serial interface accepts both I

C and standard

system management bus (SMBus) write byte, read byte,

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 a pin (e.g., 3.3V for the 3.3V

pin),

the conversion result is equal to 3/4 of the ADC full-scale

range or a decimal count of 192 (Table 3). The tempera-

ture data format is 7 bits plus sign, with each data bit

representing 1°C, in two's complement format (Table 2).

The MAX6652 has only one address pin, ADD. One of

four different address codes can be selected by con-

necting the ADD pin to GND, V

, SDA, or SCL.

Whenever an I

C-compatible/SMBus transaction is initiat-

ed, the two LSBs of the slave address register are deter-

mined by connection, setting the chip address to one of

four possible values. In addition, an address code can

also be directly written to the serial address register. This

code will overwrite the code set by connection of the

ADD pin, until the MAX6652 is taken through a power-on

reset cycle.

The MAX6652 features 60Hz or 50Hz line-frequency

rejection for optimal performance. The device operates

from +2.7V to +5.5V and is specified for operation from

-40°C to +125°C. It is available in a tiny 10-pin µMAX

package.

Features

♦ Monitors Four Voltages (2.5V, 3.3V, 12V, V

)

♦ Monitors Local Temperature

♦ Temperature Measurement Accuracy,

±2°C (T

= +25°C)

♦ User-Programmable Voltage and Temperature

Thresholds

♦ Alert Function with Ability to Respond to SMB

Alert Response Address

♦ +2.7V to +5.5V Supply Range

♦ -40°C to +125°C Temperature Range

♦ 60Hz or 50Hz Line-Frequency Rejection

♦ Tiny 10-Pin µMAX Package

Applications

MAX6652

Temperature Sensor and System Monitor

in a 10-Pin µMAX

________________________________________________________________ Maxim Integrated Products 1

SCL

SDA

ADDN.C.

3.3V

2.5V

12V

MAX6652

MAX

TOP VIEW

GND ALERT

Pin Configuration

19-1959; Rev 1; 8/01

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX6652AUB -40°C to +125°C 10 µMAX

C is a trademark of Philips Corp.

Workstations

Servers

Networking

Telecommunications

Typical Application Circuit and Functional Diagram appear

at end of data sheet.

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX6652 system supervisor monitors multiplepower-supply voltages, including its own, and also fea-tures an on-board temperature

Page 2 - ABSOLUTE MAXIMUM RATINGS

MAX6652Temperature Sensor and System Monitorin a 10-Pin µMAX10 ______________________________________________________________________________________B

Page 3 - MAX6652 toc03

MAX6652Temperature Sensor and System Monitorin a 10-Pin µMAX______________________________________________________________________________________ 11S

Page 4 - Pin Description

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Page 5 - Detailed Description

MAX6652Temperature Sensor and System Monitorin a 10-Pin µMAX2 _______________________________________________________________________________________E

Page 6 - Table 3. Voltage Data Format

MAX6652Temperature Sensor and System Monitorin a 10-Pin µMAX_______________________________________________________________________________________ 3N

Page 7

MAX6652Temperature Sensor and System Monitorin a 10-Pin µMAX4 _______________________________________________________________________________________T

Page 8 - Interrupts

Detailed DescriptionThe MAX6652 is a voltage and temperature monitordesigned to communicate through an I2C-compatible/SMBus interface with an external

Page 9

MAX6652Writing a 1 to bit 0 of the configuration register startsthe monitoring function. The device will perform asequential sampling of all the input

Page 10 - Chip Information

MAX6652Temperature Sensor and System Monitorin a 10-Pin µMAX_______________________________________________________________________________________ 7T

Page 11 - C/SMBus Write Timing Diagram

MAX6652Low-Power Shutdown ModeSetting bit 0 in the configuration register to 0 stops themonitoring loop and puts the MAX6652 into low-powershutdown mo

Page 12 - Functional Diagram

MAX6652_______________________________________________________________________________________ 9Temperature Sensor and System Monitorin a 10-Pin µMAXD

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