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PDF MAX6659 Data sheet ( Hoja de datos )
| Número de pieza | MAX6659 | |
| Descripción | 1C / SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms | |
| Fabricantes | Maxim Integrated | |
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19-2034; Rev 2; 3/02
±1°C, SMBus-Compatible Remote/Local Temperature
Sensors with Overtemperature Alarms
General Description
The MAX6657/MAX6658/MAX6659 are precise, two-
channel digital temperature sensors. Each accurately
measures the temperature of its own die and one
remote PN junction, and reports the temperature in digi-
tal form on a 2-wire serial interface. The remote junction
can be a diode-connected transistor like the low-cost
NPN type 2N3904 or 2N3906 PNP type. The remote
junction can also be a common-collector PNP, such as
a substrate PNP of a microprocessor.
The 2-wire serial interface accepts standard System
Management Bus (SMBus™) commands such as Write
Byte, Read Byte, Send Byte, and Receive Byte to read
the temperature data and program the alarm thresholds
and conversion rate. The MAX6657/MAX6658/
MAX6659 can function autonomously with a program-
mable conversion rate, which allows the control of sup-
ply current and temperature update rate to match
system needs. For conversion rates of 4Hz or less, the
temperature is represented in extended mode as 10
bits + sign with a resolution of 0.125°C. When the con-
version rate is faster than 4Hz, output data is 7 bits +
sign with a resolution of 1°C. The MAX6657/
MAX6658/MAX6659 also include an SMBus timeout
feature to enhance system reliability.
Remote accuracy is ±1°C between +60°C and +100°C
with no calibration needed. The MAX6657 measures
temperatures from 0°C to +125°C and the MAX6658/
MAX6659 from -55°C to +125°C. The MAX6659 has the
added benefit of being able to select one of three
addresses through an address pin, and a second over-
temperature alarm pin for greater system reliability.
Desktop Computers
Notebook Computers
Servers
Applications
Workstations
Typical Operating Circuit appears at the end of the
data sheet.
SMBus is a trademark of Intel Corp.
I2C is a trademark of Philips Corp.
Features
o Dual Channel: Measures Remote and Local
Temperature
o 11-Bit, 0.125°C Resolution
o High Accuracy ±1°C (max) from +60°C to +100°C
(Remote)
o No Calibration Required
o Programmable Under/Overtemperature Alarms
o Programmable Conversion Rate
(0.0625Hz to 16Hz)
o SMBus/I2C™-Compatible Interface
o Two Alarm Outputs: ALERT and OVERT1
(MAX6657 and MAX6658)
o Three Alarm Outputs: ALERT, OVERT1,
and OVERT2 (MAX6659)
Ordering Information
PART
TEMP.
RANGE
PIN-
MEASURED
PACKAGE TEMP. RANGE
MAX6657MSA -55°C to +125°C 8 SO
MAX6658MSA -55°C to +125°C 8 SO
MAX6659MEE -55°C to +125°C 16 QSOP
0°C to +125°C
-55°C to +125°C
-55°C to +125°C
TOP VIEW
Pin Configurations
VCC 1
N.C. 2
DXP 3
DXN 4
ADD 5
OVERT1 6
GND 7
GND 8
MAX6659
16 N.C.
15 STBY
14 SMBCLK
13 N.C.
12 SMBDATA
VCC 1
DXP 2
DXN 3
11 N.C. OVERT1 4
10 OVERT2
9 ALERT
MAX6657
MAX6658
8 SMBCLK
7 SMBDATA
6 ALERT
5 GND
SO
QSOP
________________________________________________________________ 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  
±1°C, SMBus-Compatible Remote/Local Temperature
Sensors with Overtemperature Alarms
Pin Description
PIN
MAX6657
MAX6658
MAX6659
11
NAME
FUNCTION
Supply Voltage Input, +3V to +5.5V. Bypass to GND with a 0.1µF capacitor. A 200Ω
VCC series resistor is recommended but not required for additional noise filtering. See
Typical Operating Circuit.
Combined Remote-Diode Current Source and A/D Positive Input for Remote-Diode
2
3
DXP
Channel. DO NOT LEAVE DXP FLOATING; connect DXP to DXN if no remote diode
is used. Place a 2200pF capacitor between DXP and DXN for noise filtering.
3
4
DXN
Combined Remote-Diode Current Sink and A/D Negative Input. DXN is internally
biased to one diode drop above ground.
4
6
OVERT1
Overtemperature Active-Low Output, Open-Drain. Output is logic low only when
temperature is above the software programmed threshold.
5
7, 8
GND
Ground
SMBus Alert (Interrupt) Active-Low Output, Open-Drain. Asserts when temperature
6
9
ALERT
exceeds user-set limits (high or low temperature). Stays asserted until acknowledged
by either reading the Status register or by successfully responding to an Alert
Response address. See ALERT Interrupts.
7 12 SMBDATA SMBus Serial-Data Input/Output, Open-Drain
8 14 SMBCLK SMBus Serial-Clock Input
—
5
ADD
SMBus Address-Select Pin. The MAX6659 is set to one of three available addresses
(connect to VCC, GND, or leave open). See Slave Addresses section.
—
10
OVERT2
Overtemperature Active-Low Output, Open-Drain. Output is logic low only when
temperature is above the software programmed threshold.
—
15
STBY
Hardware Standby Input. Temperature and comparison threshold data are retained in
standby mode. If STBY is low, the IC is put into standby mode.
—
2, 11, 13, 16
N.C.
Not internally connected. Do not make connections to these pins.
_______________________________________________________________________________________ 5
5 Page 
±1°C, SMBus-Compatible Remote/Local Temperature
Sensors with Overtemperature Alarms
Table 2. Data Format (Two's Complement)
TEMP (°C)
130.00
127.00
126.00
25
0.00
-1
-25
-55
Diode Fault
(Short or Open)
DIGITAL OUTPUT
MAX6657
MAX6658
MAX6659
0 111 1111
0 111 1111
0 111 1111
0 111 1111
0 111 1111
0 111 1111
0 001 1001
0 000 0000
0 001 1001
0 000 0000
1 000 0000
1 000 0000
1 111 1111
1 110 0111
1 000 0000
1 100 1001
1 000 0000
1 000 0000
Alarm Threshold Registers
Four registers store ALERT threshold values—one high-
temperature (THIGH) and one low-temperature (TLOW)
register each for the local and remote channels. If
either measured temperature equals or exceeds the
corresponding ALERT threshold value, the ALERT out-
put is asserted.
The POR state of both ALERT THIGH registers is 0100
0110 or +70°C and the POR state of TLOW registers is
1100 1001 or -55°C.
Four additional registers store remote and local alarm
threshold data corresponding to the OVERT1 and
OVERT2 (MAX6659 only) outputs. The values stored in
these registers are high-temperature thresholds. If any
one of the measured temperatures equals or exceeds
the corresponding alarm threshold value, an OVERT
output is asserted. The POR state of the OVERT thresh-
old is 0101 0101 or +85°C.
Alert Interrupts
An ALERT interrupt occurs when the internal or external
temperature reading exceeds a high or low tempera-
ture limit (user programmed) or when the remote diode
is disconnected (for continuity fault detection). The
ALERT interrupt output signal is latched and can be
cleared only by either reading the Status register or by
successfully responding to an Alert Response address.
In both cases, the alert is cleared even if the fault con-
dition still exists, but is reasserted at the end of the next
conversion. The interrupt does not halt automatic con-
versions. The interrupt output pin is open-drain so that
multiple devices can share a common interrupt line.
The interrupt rate never exceeds the conversion rate.
Table 3. Extended Resolution Register
FRACTIONAL
TEMPERATURE
CONTENTS OF
EXTENDED REGISTER
0.000
000X XXXX
0.125
001X XXXX
0.250
010X XXXX
0.375
011X XXXX
0.500
100X XXXX
0.625
101X XXXX
0.750
110X XXXX
0.875
111X XXXX
Note: Extended resolution applies only for conversion rates of
4Hz and slower.
Alert Response Address
The SMBus Alert Response interrupt pointer provides
quick fault identification for simple slave devices that
lack the complex, expensive logic needed to be a bus
master. Upon receiving an ALERT interrupt signal, the
host master can broadcast a Receive Byte transmission
to the Alert Response slave address (0001100). Then,
any slave device that generated an interrupt attempts
to identify itself by putting its own address on the bus
(Table 8).
The Alert Response can activate several different slave
devices simultaneously, similar to the I2C General Call.
If more than one slave attempts to respond, bus arbitra-
tion rules apply, and the device with the lower address
code wins. The losing device does not generate an
acknowledge and continues to hold the ALERT line low
until cleared. (The conditions for clearing an alert vary,
depending on the type of slave device.) Successful
completion of the Alert Response protocol clears the
interrupt latch, provided the condition that caused the
alert no longer exists. If the condition still exists, the
device reasserts the ALERT interrupt at the end of the
next conversion.
OVERT Overtemperature
Alarm/Warning Outputs
OVERT1 and OVERT2 (MAX6659 only) are asserted
when the temperature rises to a value programmed in
the appropriate threshold register. They are deasserted
when the temperature drops below this threshold minus
the hysteresis. An OVERT output can be used to acti-
vate a cooling fan, send a warning, or trigger a system
shutdown to prevent component damage. The HYST
byte sets the amount of hysteresis for both OVERT out-
puts. The data format for the HYST byte is the same for
the other temperature registers (Table 2).
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX6659.PDF ] | |
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