MAX6680MEE+ Maxim Integrated Products, MAX6680MEE+ Datasheet

IC TEMP SENSOR SMBUS 16-QSOP

MAX6680MEE+

Manufacturer Part Number
MAX6680MEE+
Description
IC TEMP SENSOR SMBUS 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX6680MEE+

Function
Thermometer, Thermostat
Topology
ADC, Multiplexer, Register Bank
Sensor Type
External & Internal
Sensing Temperature
-55°C ~ 125°C, External Sensor
Output Type
I²C™/SMBus™
Output Alarm
Yes
Output Fan
Yes
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Full Temp Accuracy
+/- 5 C, +/- 3 C
Digital Output - Bus Interface
Serial (2-Wire)
Digital Output - Number Of Bits
10 bit + Sign
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6680/MAX6681 are precise, two-channel digi-
tal thermometers. Each accurately measures the tem-
perature of its own die and one remote PN junction and
reports the temperature on a 2-wire serial interface. The
remote junction can be a diode-connected transistor
like the low-cost NPN type 2N3904 or PNP type
2N3906. The remote junction can also be a common-
collector PNP, such as a substrate PNP of a micro-
processor.
The MAX6680/MAX6681 include pin-programmable
default temperature thresholds for the OVERT output,
which provides fail-safe clock throttling or system shut-
down. In addition, the devices are pin programmable to
select whether the OVERT output responds to either the
local, remote, or both temperatures.
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 MAX6680/MAX6681 can func-
tion autonomously with a programmable conversion
rate, which allows the control of supply current and
temperature update rate to match system needs. For
conversion rates of 4Hz or less, the remote sensor tem-
perature can be represented in extended mode as 10
bits + sign with a resolution of 0.125°C. When the con-
version rate is 8Hz, output data is 7 bits + sign with a
resolution of 1°C. The MAX6680/MAX6681 also include
an SMBus timeout feature to enhance system reliability.
The MAX6681 is an upgrade to the MAX6654. The
MAX6680/MAX6681 remote accuracy is ±1°C with no
calibration needed. They are available in a 16-pin
QSOP package and operate throughout the -55°C to
+125°C temperature range.
19-2305; Rev 1; 1/05
SMBus is a trademark of Intel Corp.
I
Pin Configurations appear at end of data sheet.
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.
2
C is a trademark of Philips Corp.
Desktop Computers
Notebook
Computers
Servers
Thin Clients
Workstations
±1°C Fail-Safe Remote/Local Temperature
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Sensors with SMBus Interface
♦ Two Alarm Outputs: ALERT and OVERT
♦ Pin-Programmable Threshold for OVERT Limit
♦ Programmable Under/Overtemperature ALERT
♦ Dual Channel: Measures Remote and Local
♦ 11-Bit, 0.125°C Resolution for Remote Temperature
♦ High Accuracy ±1°C (max) from +60°C to +100°C
♦ No Calibration Required
♦ SMBus/I
♦ SMBus Timeout Prevents SMBus Lockup
MAX6680MEE
MAX6681MEE
Limit
Temperature
Measurements
(Remote)
MICROPROCESSOR
PART
2
C™-Compatible Interface
2200pF
Typical Operating Circuit
0.1µF
-55°C to +125°C
-55°C to +125°C
DXP
DXN
SENS_SEL
INT_SEL
ADD0
ADD1
TEMP RANGE
Ordering Information
V
CC
GND
MAX6680
MAX6681
STBY
CRIT0
200Ω
SMBDATA
SMBCLK
ALERT
OVERT
RESET
CRIT1
3.3V
PIN-PACKAGE
16 QSOP
16 QSOP
Features
10kΩ
EACH
DATA
CLOCK
INTERRUPT
TO µP
TO SYSTEM
SHUTDOWN
1

Related parts for MAX6680MEE+

MAX6680MEE+ Summary of contents

Page 1

... Pin Configurations appear at end of data sheet. SMBus is a trademark of Intel Corp trademark of Philips Corp. ________________________________________________________________ Maxim Integrated Products 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. Sensors with SMBus Interface ♦ Two Alarm Outputs: ALERT and OVERT ♦ ...

Page 2

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface ABSOLUTE MAXIMUM RATINGS V ...........................................................................-0.3V to +6V CC DXP.............................................................-0. DXN ......................................................................-0.3V to +0.8V SMBCLK, SMBDATA, ALERT, OVERT .....................-0.3V to +6V RESET, INT_SEL, STBY, ADD0, ADD1.....................-0.3V to +6V CRIT1, CRIT0, SENS_SEL ...

Page 3

Fail-Safe Remote/Local Temperature ELECTRICAL CHARACTERISTICS (continued) (Circuit of Typical Operating Circuit 3.3V and T = +25°C.) A PARAMETER SYMBOL CRIT0, CRIT1, ADD0, ADD1, RESET, INT_SEL, SENS_SEL Logic Input Low Voltage Logic Input High Voltage Input Leakage ...

Page 4

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface (T = +25°C, unless otherwise noted.) A STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE ...

Page 5

Fail-Safe Remote/Local Temperature PIN NAME MAX6680 MAX6681 CRIT1 CRIT0 3 3 DXP 4 4 DXN 6 6 ADD1 7 7 RESET 8 8 GND OVERT ADD0 ALERT ...

Page 6

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface V CC RESET CIRCUITRY DXP DXN ALERT OVERT CRIT0 CRIT1 Figure 1. MAX6680/MAX6681 Functional Diagram Detailed Description The MAX6680/MAX6681 are temperature sensors designed to work in conjunction with a microprocessor or other ...

Page 7

Fail-Safe Remote/Local Temperature age and computes the temperature based on this volt- age. If the remote channel is not used, connect DXP to DXN. Do not leave DXP and DXN unconnected. When a conversion is initiated, both channels are ...

Page 8

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface ply hum. In noisy environments, high-frequency noise reduction is needed for high-accuracy remote mea- surements. The noise can be reduced with careful PC board layout and proper external noise filtering. High-frequency EMI ...

Page 9

Fail-Safe Remote/Local Temperature Write Byte Format S ADDRESS WR 7 bits Slave Address: equiva- lent to chip-select line of a 3-wire interface Read Byte Format ADDRESS WR ACK 7 bits Slave Address: equiva- lent to chip-select line Send Byte ...

Page 10

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface To ensure valid extended data, read extended resolu- tion temperature data using one of the following approaches: 1) Put the MAX6680/MAX6681 into standby mode by setting bit 6 of the Configuration register ...

Page 11

Fail-Safe Remote/Local Temperature LOW HIGH SMBCLK SMBDATA t t SU:STA HD:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT ...

Page 12

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface 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 ...

Page 13

Fail-Safe Remote/Local Temperature Table 5. Command-Byte Register Bit Assignments REGISTER ADDRESS POR STATE RLTS 00h RRTE 01h RSL 02h RCL/WCL 03h/09h RCRA/WCRA 04h/0A RIH/WIH 05h/0Bh RIL/WIL 06h/0Ch REH/WEH 07h/0Dh REL/WEL 08h/0Eh OSHT 0Fh REET 10h RWOH 11h RWOL 12h ...

Page 14

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface Table 6. Configuration-Byte Bit Assignment BIT NAME ALERT MASK 7 (MSB) 6 RUN/STOP 5 SPNP 4 Extended Resolution 3 Extended Range 2 SMBus Timeout 1 Software Reset 0 RFU Table 7. Status ...

Page 15

Fail-Safe Remote/Local Temperature reside on the same bus without address conflicts (Table 9). The address pin states are checked at POR and RESET only, and the address data stays latched to reduce qui- escent supply current due to the ...

Page 16

Fail-Safe Remote/Local Temperature Sensors with SMBus Interface TOP VIEW CRIT1 2 DXP 3 MAX6680 DXN 4 CRIT0 5 ADD1 6 RESET 7 GND 8 QSOP 16 ______________________________________________________________________________________ 16 SENS_SEL CRIT1 STBY 2 CC ...

Page 17

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2005 Maxim Integrated Products Sensors with SMBus Interface PACKAGE OUTLINE, QSOP .150" ...

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