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PDF MAX6683 Data sheet ( Hoja de datos )
| Número de pieza | MAX6683 | |
| Descripción | Temperature Sensor and System Monitor | |
| Fabricantes | Maxim Integrated Products | |
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19-2226; Rev 1; 7/04
EVAALVUAAILTAIOBNLEKIT
Temperature Sensor and
System Monitor in a 10-Pin µMAX
General Description
The MAX6683 system supervisor monitors multiple
power-supply voltages, including its own, and also fea-
tures an on-board temperature sensor. The MAX6683
converts voltages to an 8-bit code and temperatures to
an 11-bit (10-bit-plus-sign) code using an analog-to-
digital converter (ADC). A multiplexer automatically
sequences through the voltage and temperature mea-
surements. The digitized signals are then stored in reg-
isters and compared to the over/underthreshold limits
programmed over the SMBus™/I2C™-compatible 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 MAX6683
generates a latched interrupt output ALERT. Three
interrupt modes are available for temperature excur-
sions. These are default mode, one-time interrupt
mode, and comparator mode. The ALERT output is
cleared, except for temperature interrupts generated in
comparator mode, by reading the Interrupt Status reg-
ister (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 zero. The MAX6683 SMBus/I2C-
compatible interface also responds to the SMB alert
response address.
Applications
Workstations
Servers
Networking
Telecommunications
Features
♦ Monitors Local Temperature
♦ Monitors Three External Voltages (1.8V, 2.5V, 5V
Nominal)
♦ Monitors VCC (3.3V Nominal)
♦ 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
♦ MAX6683EVKIT Available
PART
MAX6683AUB
Ordering Information
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
10 µMAX
Typical Application Circuit
1.8V
CPU 0.1μF
VCC = +3.3V
TO 1.8V
TO 2.5V
TO 5V
1.8VIN
2.5VIN
5VIN
N.C.
GND
VCC
SCL
SDA
ADD
ALERT
10kΩ
I2C/SMBus
CONTROLLER
TOP VIEW
Pin Configuration
1.8VIN 1
2.5VIN 2
5VIN 3
N.C. 4
GND 5
MAX6683
10 VCC
9 SCL
8 SDA
7 ADD
6 ALERT
SMBus is a trademark of Intel Corp.
I2C is a trademark of Philips Corp.
________________________________________________________________ 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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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Temperature Sensor and
System Monitor in a 10-Pin µMAX
Pin Description
PIN NAME
FUNCTION
1 1.8VIN Analog Input. Monitors 1.8V nominal supply.
2 2.5VIN Analog Input. Monitors 2.5V nominal supply.
3 5VIN Analog Input. Monitors 5V nominal supply.
4 N.C. No Connect. Not internally connected. Connect to GND to improve thermal conductivity.
5 GND Ground
6 ALERT SMBus Alert (Interrupt) Output, Open Drain. Alerts the master that a temperature or voltage limit has been
violated.
SMBus/I2C-Compatible Address Select Input. ADD is sampled at the beginning of each SMBus/I2C
7 ADD transaction, and the 2LSBs of the Slave Address register are detemined by ADD’s connection to GND, SDA,
SCL, or VCC.
8 SDA SMBus/I2C-Compatible Serial Data Interface
9 SCL SMBus/I2C-Compatible Clock Input
10
VCC
Supply Voltage Input, +2.7V to +5.5V. Also serves as a voltage monitor input. Bypass VCC to GND with a
0.1µF capacitor.
Detailed Description
The MAX6683 is a voltage and temperature monitor
designed to communicate through an SMBus/I2C inter-
face with an external microcontroller (µC). A µC with no
built-in I2C or SMBus capabilities can generate SMBus
serial commands by “bit-banging” general-purpose
input-output (GPIO) pins.
The MAX6683 can monitor external supply voltages of
typically 1.8V, 2.5V, 5V, as well as its own supply volt-
age and temperature. This makes it ideal for supervisor
and thermal management applications in telecommuni-
cations, desktop and notebook computers, worksta-
tions, and networking equipment. Voltage inputs are
converted to an 8-bit code and temperature is convert-
ed to an 11-bit code. The high-order 8 bits of the tem-
perature conversion can be read using a read byte
operation through the I2C interface. The full 11-bit tem-
perature conversion is read using a read word opera-
tion and disregarding the lower 5 bits of the low byte.
By setting bit 5 of the Configuration Register to 1, the
temperature conversion can be reduced to 9 bits with a
four-fold reduction in conversion time. In this case, the
lower 7 bits of the low byte should be disregarded; 8-
bit temperature data has a resolution of 1°C/LSB, while
11-bit temperature data has a resolution of 0.125°C/
LSB. Setting bit 5 of the Configuration Register to 1
reduces the monitoring cycle time by a factor of 4. In
this case, a read word operation for temperature data
yields a 9-bit code in which the lower 7 bits of the low
byte should be disregarded. The LSB of the 9-bit tem-
perature data has a value of 0.5°C.
Each input voltage is scaled down by an on-chip resis-
tive voltage-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). Input voltages other
than the nominal values may be used; ensure that they
fall within the usable ranges of pins to which they are
applied. Attenuate voltages greater than 6V with an
external resistive voltage-divider.
Writing a 1 to bit 0 of the Configuration Register starts
the monitoring function. The device performs a sequen-
tial sampling of all the inputs, starting with the internal
temperature sensor and continuing with 2.5VIN, 1.8VIN,
5VIN, and VCC. If the master terminates the conversion,
the sequential sampling does not stop until the sam-
pling cycle is completed and the results are stored.
When it starts again, it always starts with the tempera-
ture measurement.
An interrupt signal is generated when a temperature
measurement goes above the hot limit or when a volt-
age measurement is either above the high limit or
below the low limit. This causes the open-drain output
ALERT to go to the active-low state and set each corre-
sponding interrupt status bit (bits 0 through 4) to 1
(Table 5). The interrupt is cleared by reading the
Interrupt Status Register except for temperature inter-
rupts generated in comparator mode. Reading the
Interrupt Status Register also clears the register itself,
except for temperature interrupt bits set in comparator
mode.
_______________________________________________________________________________________ 5
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5 Page 
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Temperature Sensor and
System Monitor in a 10-Pin µMAX
AB
C D EF
tLOW tHIGH
SMBCLK
G
SMBDATA
tSU:STA tHD:STA
tSU:DAT
tHD:DAT
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
Figure 3. SMBus Write Timing Diagram
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = SLAVE PULLS SMBDATA LINE LOW
H I JK
LM
tSU:STO tBUF
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
AB
C D EF
tLOW tHIGH
SMBCLK
G
H I JK
LM
SMBDATA
tSU:STA tHD:STA
tSU:DAT
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 MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
Figure 4. SMBus Read Timing Diagram
tSU:STO tBUF
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
SMBus/I2C-Compatible Digital Interface
From a software prospective, the MAX6683 appears as
a set of byte-wide registers that contain voltage and tem-
perature data, alarm threshold values, or control bits.
The device employs five standard SMBus protocols:
write byte, read byte, read word, send byte, and
receive byte (Figures 2, 3, 4).
Slave Address
The device address can be set to one of four different
values by pin strapping ADD to GND, SDA, SCL, or
VCC, so more than one MAX6683 can reside on the
same bus without address conflicts (Table 1). The
address pin state is checked at the beginning of each
SMBus/I2C transaction and is insensitive to glitches on
VCC. Any address code can also be written to the
Serial Address Register and overwrites the code set by
connecting the ADD pin until the MAX6683 is taken
through a POR cycle.
The MAX6683 also responds to the SMBus alert
response address (see Alert Response Address).
______________________________________________________________________________________ 11
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| PDF Descargar | [ Datasheet MAX6683.PDF ] | |
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