MAX6657MSA Maxim Integrated Products, MAX6657MSA Datasheet

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MAX6657MSA

Manufacturer Part Number
MAX6657MSA
Description
Board Mount Temperature Sensors
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6658MSA.pdf (16 pages)

Specifications of MAX6657MSA

Full Temp Accuracy
+/- 5 C
Package / Case
SOIC-8 Narrow
Digital Output - Bus Interface
Serial (2-Wire, I2C)
Digital Output - Number Of Bits
10 bit + Sign
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
0 C
Output Type
Digital
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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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.
SMBus is a trademark of Intel Corp.
±1°C, SMBus-Compatible Remote/Local Temperature
19-2034; Rev 5; 10/10
Typical Operating Circuit appears at the end of the data
sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Desktop Computers
Notebook Computers
Servers
________________________________________________________________ Maxim Integrated Products
General Description
Sensors with Overtemperature Alarms
Workstations
Applications
o Dual Channel Measures Remote and Local
o 11-Bit, +0.125°C Resolution
o High Accuracy ±1°C (max) from +60°C to +100°C
o No Calibration Required
o Programmable Under/Overtemperature Alarms
o Programmable Conversion Rate
o SMBus/I
o Two Alarm Outputs: ALERT and OVERT1
o Three Alarm Outputs: ALERT, OVERT1,
o Compatible with 65nm Process Technology
Note: All devices are specified over the -55°C to +125°C oper-
ating temperature range.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information continued at end of data sheet.
MAX6657MSA
MAX6657MSA+
MAX6657MSA-T
MAX6657MSA+T
MAX6657YMSA+
MAX6657YMSA+T
TOP VIEW
OVERT1
Temperature
(Remote)
(0.0625Hz to 16Hz)
(MAX6657 and MAX6658)
and OVERT2 (MAX6659)
(Y Versions)
GND
GND
N.C.
DXP
DXN
ADD
V
CC
1
2
3
4
5
6
7
8
PART
MAX6659
2
C-Compatible Interface
QSOP
16
15
14
13
12
11
10
MEASURED TEMP
9
Ordering Information
N.C.
STBY
SMBCLK
N.C.
SMBDATA
N.C.
OVERT2
ALERT
0°C to +125°C
0°C to +125°C
0°C to +125°C
0°C to +125°C
0°C to +125°C
0°C to +125°C
Pin Configurations
RANGE
OVERT1
DXN
DXP
V
CC
1
2
4
3
MAX6657
MAX6658
PIN-PACKAGE
8 SO
8 SO
8 SO
8 SO
8 SO
8 SO
SO
Features
8
7
6
5
SMBCLK
SMBDATA
ALERT
GND
1

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MAX6657MSA Summary of contents

Page 1

... Three Alarm Outputs: ALERT, OVERT1, and OVERT2 (MAX6659) o Compatible with 65nm Process Technology (Y Versions) PART MAX6657MSA MAX6657MSA+ MAX6657MSA-T MAX6657MSA+T MAX6657YMSA+ MAX6657YMSA+T Note: All devices are specified over the -55°C to +125°C oper- Applications ating temperature range. + Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. ...

Page 2

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) V ..........................................................................-0.3V to +6V CC DXP ............................................................-0. DXN ......................................................................-0.3V to +0.8V SMBCLK, SMBDATA, ALERT, OVERT1, OVERT2 ..............................................................-0.3V to +6V SMBDATA, ALERT, OVERT1, ...

Page 3

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms ELECTRICAL CHARACTERISTICS (continued +3.0V to +5.5V 0°C to +125°C, unless otherwise specified. Typical values are PARAMETER SYMBOL Average Operating Current Conversion Time t Conversion ...

Page 4

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms (V = +3.3V +25°C, unless otherwise noted STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.5 4.0 3.5 3.0 2.5 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) LOCAL TEMPERATURE ...

Page 5

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms PIN NAME MAX6657 MAX6659 MAX6658 DXP 3 4 DXN OVERT1 GND ALERT SMBDATA 8 14 SMBCLK — ...

Page 6

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms V CC DXP DXN ALERT OVERT1 (OVERT2 Detailed Description The MAX6657/MAX6658/MAX6659 are temperature sensors designed to work in conjunction with a micro- processor ...

Page 7

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Table 1. Remote-Sensor Transistor MANUFACTURER Central Semiconductor (USA) CMPT3904 Fairchild Semiconductor (USA) 2N3904, 2N3906 On Semiconductor (USA) 2N3904, 2N3906 Rohm Semiconductor (USA) SST3904 Samsung (Korea) KST3904-TF Siemens (Germany) SMBT3904 Zetex (England) FMMT3904CT-ND ...

Page 8

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms surements. The noise can be reduced with careful PC board layout and proper external noise filtering. High-frequency EMI is best filtered at DXP and DXN with an external 2200pF capacitor. Larger capacitor ...

Page 9

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms ture registers are not updated. The previous data is not changed and remains available. SMBus Digital Interface From a software perspective, each of the MAX6657/ MAX6658/MAX6659 appears as a series of 8-bit ...

Page 10

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms LOW HIGH SMBCLK SMBDATA t t HD:STA SU:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE ...

Page 11

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Table 2. Data Format (Two's Complement) DIGITAL OUTPUT TEMP (°C) MAX6657 130.00 0 111 1111 127.00 0 111 1111 126.00 0 111 1111 25 0 001 1001 0.00 0 000 0000 -1 ...

Page 12

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Table 4. Command Byte Register Assignments REGISTER ADDRESS RLTS 00h RRTE 01h RSL 02h RCL 03h RCRA 04h RLHN 05h RLLI 06h RRHI 07h RRLS 08h WCA 09h WCRW 0Ah WLHO 0Bh ...

Page 13

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Status Byte Functions The status byte (Table 6) indicates which (if any) tem- perature thresholds have been exceeded. This byte also indicates whether the ADC is converting and if there is an ...

Page 14

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Table 7. Conversion-Rate Control Byte DATA CONVERSION RATE (Hz) 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah-FFh Note: Extended resolution applies only for conversion rates of 4Hz or slower. ...

Page 15

SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms 2200pF µP () ARE MAX6659 ONLY Ordering Information (continued) MEASURED TEMP PART RANGE MAX6658MSA -55°C to +125°C MAX6658MSA+ -55°C to +125°C MAX6658MSA-T -55°C to +125°C MAX6658MSA+T -55°C to +125°C MAX6659MEE -55°C to ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

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