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MAX6657 Datasheet

  • MAX6657

  • "?à1??C, SMBus-Compatible Remote/Local Temperature Sensors ...

  • 275.13KB

  • Maxim

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19-2034; Rev 2; 3/02
卤1掳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鈩? 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掳C. When the con-
version rate is faster than 4Hz, output data is 7 bits +
sign with a resolution of 1掳C. The MAX6657/
MAX6658/MAX6659 also include an SMBus timeout
feature to enhance system reliability.
Remote accuracy is 卤1掳C between +60掳C and +100掳C
with no calibration needed. The MAX6657 measures
temperatures from 0掳C to +125掳C and the MAX6658/
MAX6659 from -55掳C to +125掳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.
Features
o
Dual Channel: Measures Remote and Local
Temperature
o
11-Bit, 0.125掳C Resolution
o
High Accuracy 卤1掳C (max) from +60掳C to +100掳C
(Remote)
o
No Calibration Required
o
Programmable Under/Overtemperature Alarms
o
Programmable Conversion Rate
(0.0625Hz to 16Hz)
o
SMBus/I
2
C鈩?Compatible Interface
o
Two Alarm Outputs:
ALERT
and
OVERT1
(MAX6657 and MAX6658)
o
Three Alarm Outputs:
ALERT, OVERT1,
and
OVERT2
(MAX6659)
MAX6657/MAX6658/MAX6659
Ordering Information
PART
TEMP.
RANGE
PIN-
MEASURED
PACKAGE TEMP. RANGE
0掳C to +125掳C
-55掳C to +125掳C
-55掳C to +125掳C
MAX6657
MSA -55掳C to +125掳C 8 SO
MAX6658
MSA -55掳C to +125掳C 8 SO
MAX6659
MEE -55掳C to +125掳C 16 QSOP
Applications
Desktop Computers
Notebook Computers
Servers
Workstations
TOP VIEW
Pin Configurations
V
CC
1
N.C. 2
DXP 3
DXN 4
16 N.C.
15 STBY
14 SMBCLK
V
CC
1
DXP 2
DXN 3
OVERT1 4
8 SMBCLK
7 SMBDATA
MAX6659
13 N.C.
12 SMBDATA
11 N.C.
10 OVERT2
9 ALERT
Typical Operating Circuit appears at the end of the
data sheet.
ADD 5
OVERT1 6
GND 7
GND 8
MAX6657
MAX6658
6 ALERT
5 GND
SO
SMBus is a trademark of Intel Corp.
I
2
C is a trademark of Philips Corp.
QSOP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX6657 PDF文件相关型号

MAX6657-MAX6659,MAX6657MSA,MAX6658,MAX6658MSA,MAX6659,MAX6659MEE

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