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PDF MAX6652 Data sheet ( Hoja de datos )
| Número de pieza | MAX6652 | |
| Descripción | Temperature Sensor and System Monitor | |
| Fabricantes | Maxim Integrated | |
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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.
1 page  
Temperature Sensor and System Monitor
in a 10-Pin µMAX
Detailed Description
The MAX6652 is a voltage and temperature monitor
designed to communicate through an I2C-compatible/
SMBus interface with an external microcontroller (µC).
A µC with no built-in I2C-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 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.
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 ✕ 12V)
1010 1101 (0.9 ✕ 12V)
1101 0011 (1.1 ✕ 3.3V)
1010 1101 (0.9 ✕ 3.3V)
1101 0011 (1.1 ✕ 5V)
1010 1101 ✕ (0.9 ✕ 5V)
0101 0000 ✕ (+80°C)
0100 0001 ✕ (+65°C)
0000 1000
0000 0000
0000 0000
DESCRIPTION
Data register for 2.5 VIN measurement
Data register for 12VIN measurement
Data register for 3.3VIN measurement
Data register for VCC measurement
Data register for temperature measurement
High limit for 2.5VIN
Low limit for 2.5VIN
High limit for 12VIN
Low limit for 12VIN
High limit for 3.3VIN
Low limit for 3.3VIN
High limit for VCC
Low limit for VCC
Hot temperature limit
Hot temperature hysteresis
Configuration register
Interrupt status register
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 VCC
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
_______________________________________________________________________________________ 5
5 Page 
Temperature Sensor and System Monitor
in a 10-Pin µMAX
Write Byte Format
S
ADDRESS WR ACK
COMMAND
ACK
DATA
7 bits
8 bits
8 bits
ACK
P
Slave Address: equiva-
lent to chip-select line of
a 3-wire interface
Command Byte: selects which
register you are writing to
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
Read Byte Format
S ADDRESS WR ACK COMMAND ACK
7 bits
8 bits
S ADDRESS RD ACK DATA
7 bits
8 bits
A
P
Slave Address: equiva-
lent to chip-select line
Command Byte: selects
which register you are
reading from
Slave Address: repeated
due to change in data-
flow direction
Data Byte: reads from
the register set by the
command byte
Send Byte Format
Receive Byte Format
S ADDRESS WR ACK COMMAND ACK P
7 bits
8 bits
Data Byte: writes data to the
register commanded by the
last read byte or write byte
transmission
S = Start condition Shaded = Slave transmission
P = Stop condition A = Not acknowledged
S ADDRESS RD ACK DATA A
P
7 bits
8 bits
Data Byte: reads data from
the register commanded
by the last read byte or
write byte transmission;
also used for SMBus alert
response return address
Figure 2. I2C/SMBus Protocols
AB
C D EF
tLOW tHIGH
SMBCLK
G
H I JK
LM
SMBDATA
tSU:STA tHD:STA
tSU:DAT
tHD:DAT
tSU:STO tBUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = MASTER PULLS DATA LINE LOW
Figure 3. I2C/SMBus Write Timing Diagram
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX6652.PDF ] | |
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