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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6652 Datasheet

Temperature Sensor and System Monitor

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MAX6652 pdf
19-1959; Rev 1; 8/01
Temperature Sensor and System Monitor
in a 10-Pin µMAX
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 I2C-compatible/SMBus interface also
responds to the SMB alert response address.
The 2-wire serial interface accepts both I2C 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 3.3VIN 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, VCC, SDA, or SCL.
Whenever an I2C-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.
I 2C is a trademark of Philips Corp.
Features
o Monitors Four Voltages (2.5V, 3.3V, 12V, VCC)
o Monitors Local Temperature
o Temperature Measurement Accuracy,
±2°C (TA = +25°C)
o User-Programmable Voltage and Temperature
Thresholds
o Alert Function with Ability to Respond to SMB
Alert Response Address
o +2.7V to +5.5V Supply Range
o -40°C to +125°C Temperature Range
o 60Hz or 50Hz Line-Frequency Rejection
o Tiny 10-Pin µMAX Package
Workstations
Servers
Applications
Networking
Telecommunications
PART
MAX6652AUB
Ordering Information
TEMP. RANGE
-40°C to +125°C
PIN-PACKAGE
10 µMAX
Pin Configuration
TOP VIEW
12VIN 1
2.5VIN 2
3.3VIN 3
N.C. 4
GND 5
MAX6652
µMAX
10 VCC
9 SCL
8 SDA
7 ADD
6 ALERT
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6652 Datasheet

Temperature Sensor and System Monitor

No Preview Available !

MAX6652 pdf
Temperature Sensor and System Monitor
in a 10-Pin µMAX
ABSOLUTE MAXIMUM RATINGS
All Voltages Are Referenced to GND
VCC ........................................................................-0.3V to +6.0V
Voltage on 12VIN ...................................................-0.3V to +16V
All Other Pins ........................................................-0.3V to +6.0V
Output Current (SDA, ALERT) ............................-1mA to +50mA
Junction Temperature .....................................................+150°C
Operating Temperature Range ........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ..........444mW
Lead Temperature (soldering, 10s) ................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +5V, TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
POWER SUPPLY
Supply Voltage
Supply Current
VCC
ICC Active
ISD
Shutdown mode, all digital inputs are
grounded
2.7 5.5
200 500
<1 10
V
µA
µA
Power-On Reset Voltage
TEMPERATURE
VCC_ rising or falling edge
2V
Accuracy (Note 5)
PSRR
Resolution
TA = +25°C
VCC = +5V
-20°C TA +80°C
-40°C TA +125°C
VCC = +2.7V to +5.5V
±2
±3 °C
±5
0.7 1.3 °C/V
±1 °C
ADC CHARACTERISTICS
Total Unadjusted Error
Differential Nonlinearity
Supply Sensitivity
Input Resistance
Total Monitoring Cycle Time
TUE
DNL
PSS
RIN
tc
VIN > 10LSB
VIN > 10LSB
VCC = +2.7V to +5.5V
12VIN, 2.5VIN, 3.3VIN
(Note 1)
±1 ±1.5 %
±1 LSB
±1 V
100 150
200
k
200 300 ms
SCL, SDA, ADD
Logic Input Low Voltage
Logic Input High Voltage
SDA Output Low Voltage
Input Leakage Current
ALERT
VIL
VIH
VOL
ILEAK
VCC 3.6V
VCC > 3.6V
ISINK = 3mA
VIN = 0 or 5V
0.8 V
2.0 V
2.6 V
400 mV
±1 µA
Output Low Voltage
TIMING
VOLA
ISINK = 1.2mA, VCC > 2.7V
ISINK = 3.2mA, VCC > 4.5V
0.3 V
0.4 V
Serial Clock Frequency
fSCL
0 400 kHz
Bus Free Time Between STOP and
START
tBUF
1.3 µs
2 _______________________________________________________________________________________


Part Number MAX6652
Description Temperature Sensor and System Monitor
Maker Maxim
Total Page 12 Pages
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