MAXIM MAX6657, MAX6658, MAX6659 Technical data

General Description

The MAX6657/MAX6658/MAX6659 are precise, twochannel digital temperature sensors. Each accurately measures the temperature of its own die and one remote PN junction, and reports the temperature in digital 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 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 temperature is represented in extended mode as 10 bits + sign with a resolution of 0.125°C. When the conversion 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 overtemperature alarm pin for greater system reliability.

Applications

Desktop Computers Workstations Notebook Computers Servers

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/I

C-Compatible Interface

o Two Alarm Outputs: ALERT and OVERT1

(MAX6657 and MAX6658)

o Three Alarm Outputs: ALERT, OVERT1,

and OVERT2 (MAX6659)

o Compatible with 65nm Process Technology

(Y Versions)

MAX6657/MAX6658/MAX6659

±1°C, SMBus-Compatible Remote/Local Temperature

Sensors with Overtemperature Alarms

________________________________________________________________

Maxim Integrated Products

19-2034; Rev 5; 10/10

Ordering Information

SMBus is a trademark of Intel Corp.

N.C.

STBY

SMBCLK

N.C.

SMBDATA

N.C.

OVERT2

ALERT

TOP VIEW

MAX6659

QSOP

N.C.

DXP

OVERT1

DXN

ADD

GND

ALERT

GNDOVERT1

87SMBCLK

SMBDATADXP

DXN

MAX6657 MAX6658

Pin Configurations

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.

Typical Operating Circuit appears at the end of the data sheet.

Ordering Information continued at end of data sheet.

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.

PART

MAX6657MSA 0°C to +125°C 8 SO

MAX6657MSA+ 0°C to +125°C 8 SO

MAX6657MSA-T 0°C to +125°C 8 SO

MAX6657MSA+T 0°C to +125°C 8 SO

MAX6657YMSA+ 0°C to +125°C 8 SO

MAX6657YMSA+T 0°C to +125°C 8 SO

MEASURED TEMP

RANGE

PIN-PACKAGE

MAX6657/MAX6658/MAX6659

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to GND.) V

..........................................................................-0.3V to +6V

DXP ............................................................-0.3V to (V

+ 0.3V)

DXN ......................................................................-0.3V to +0.8V

SMBCLK, SMBDATA, ALERT, OVERT1,

OVERT2 ..............................................................-0.3V to +6V

SMBDATA, ALERT, OVERT1, OVERT2

Current ..........................................................-1mA to +50mA

DXN Current ......................................................................±1mA

Continuous Power Dissipation (T

= +70°C)

8-Pin SO (derate 5.9mW/°C above +70°C) .................471mW

16-Pin QSOP (derate 8.3mW/°C above +70°C) ..........664mW

Junction Temperature .....................................................+150°C

Storage Temperature Range ............................-65°C to +150°C

Lead Temperature (soldering, 10s) ................................+300°C

Soldering Temperature (reflow)

Lead(Pb)-free ..............................................................+260°C

Containing lead(Pb) ....................................................+240°C

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= 0°C to +125°C, unless otherwise specified. Typical values are at VCC= +3.3V and TA= +25°C.)

±1°C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Temperature Resolution, Legacy Mode

Temperature Resolution, Extended Mode

TRJ = +60°C to +100°C, VCC = +3.3V

Remote Temperature Error (MAX6657, MAX6657Y)

Local Temperature Error (MAX6657)

Remote Temperature Error (MAX6658/MAX6659/ MAX6658Y/MAX6659Y)

Local Temperature Error (MAX6658/MAX6659)

Local Temperature Error (MAX665_Y)

Line Regulation 3.0V ≤ VCC ≤ 5.5V 0.2 0.6 m°C/V

Supply Voltage Range V

Undervoltage Lockout Threshold UVLO Falling edge of VCC disables ADC 2.60 2.80 2.95 V

Undervoltage Lockout Hysteresis 90 mV

Power-On Reset (POR) Threshold VCC, falling edge 1.5 2.0 2.5 V

POR Threshold Hysteresis 90 mV

Standby Supply Current SMBus static 3 10 µA

Operating Current During conversion 0.5 1.0 mA

(Note 1)

TRJ = 0°C to +100°C, VCC = +3.3V (Note 1) -3.0 +3.0

= 0°C to +125°C, VCC = +3.3V (Note 1) -5.0 +5.0

TA = +60°C to +100°C, VCC = +3.3V -2.0 +2.0

TA = 0°C to +100°C, VCC = +3.3V -3.0 +3.0

= 0°C to +125°C, VCC = +3.3V -5.0 +5.0

TRJ = +60°C to +100°C, VCC = +3.3V (Note 1)

TRJ = 0°C to +100°C, VCC = +3.3V (Note 1) -3.0 3.0

= -55°C to +125°C, VCC = +3.3V (Note 1) -5.0 +5.0

TA = +60°C to +100°C, VCC = +3.3V -2.0 +2.0

TA = 0°C to +100°C, VCC = +3.3V -3.0 +3.0

= -55°C to +125°C, VCC = +3.3V (Note 2) -5.0 +5.0

TA = +60°C to +100°C, VCC = +3.3V -3.8

TA = 0°C to +100°C, VCC = +3.3V -4.0

= 0°C to +125°C, VCC = +3.3V -4.4

1°C

8 Bits

0.125 °C

11 Bits

-1.0 +1.0

-1.0 1.0

3.0 5.5 V

°C

MAX6657/MAX6658/MAX6659

_______________________________________________________________________________________ 3

Note 1: TA= +25°C to +85°C. Note 2: If both the local and the remote junction are below T

= -20°C, then VCC> 3.15V.

Note 3: For conversion rates of 4Hz or slower, the conversion time doubles. Note 4: Timing specifications guaranteed by design. Note 5: The serial interface resets when SMBCLK is low for more than t

TIMEOUT

Note 6: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK's falling edge.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, TA= 0°C to +125°C, unless otherwise specified. Typical values are at VCC= +3.3V and TA= +25°C.)

±1°C, SMBus-Compatible Remote/Local Temperature

Sensors with Overtemperature Alarms

Average Operating Current

SMBus-COMPATIBLE INTERFACE (SMBCLK, SMBDATA, STBY)

SMBus-COMPATIBLE TIMING (Note 4)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

0.25 conversions/s 40 70

2 conversions/s 150 250

Conversion Time t

Conversion Timing Error ±25 %

DXP and DXN Leakage Current In standby mode 100 nA

Remote-Diode Source Current I

(ALERT, OVERT)

Output Low Sink Current

Output High Leakage Current VOH = 5.5V 1 µA

Logic Input Low Voltage V

Logic Input High Voltage V

Input Leakage Current I

Output Low Sink Current I

Input Capacitance C

Serial-Clock Frequency f

Bus Free Time Between STOP and START Condition

START Condition Setup Time 4.7 µs

Repeat START Condition Setup Time

START Condition Hold Time t

STOP Condition Setup Time t

Clock Low Period t

Clock High Period t

Data Setup Time t

Receive SCL/SDA Rise Time t

Receive SCL/SDA Fall Time t

Pulse Width of Spike Suppressed t

SMBus Timeout SMBDATA low period for interface reset 25 37 45 ms

CONV

LEAK

SCL

BUF

SU:STA

HD:STA

SU:STO

LOW

HIGH

HD:DAT

From stop bit to conversion completed (Note 4)

High level 80 100 120

Low level 8 10 12

VOL = 0.4V 1

= 0.6V 6

VCC = +3.0V 2.2

VCC = +5.5V 2.4

VIN = V

VOL = 0.6V 6 mA

(Note 5) 100 kHz

90% to 90% 50 ns

10% of SMBDATA to 90% of SMBCLK 4 µs

90% of SMBCLK to 90% of SMBDATA 4 µs

10% to 10% 4.7 µs

90% to 90% 4 µs

(Note 6) 0 µs

GND

or V

95 125 156 ms

0.8 V

±1 µA

5pF

4.7 µs

1µs

300 ns

050ns

µA

MAX6657/MAX6658/MAX6659

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= +3.3V, TA= +25°C, unless otherwise noted.)

4.5

4.0

3.5

3.0

2.5

3.0 4.03.5 4.5 5.0 5.5

STANDBY SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6657 toc01

SUPPLY VOLTAGE (V)

STANDBY SUPPLY CURRENT (µA)

0.063 0.5 10.125 0.25 2 4 8 16

OPERATING SUPPLY CURRENT

vs. CONVERSION RATE

MAX6657 toc02

CONVERSION RATE (Hz)

OPERATING SUPPLY CURRENT (µA)

200

400

600

8Hz AND 16Hz ARE 1°C RESOLUTION

-3

-2

-1

-55 -5-30 20 45 70 95 120

MAX6659

REMOTE TEMPERATURE ERROR

vs. REMOTE-DIODE TEMPERATURE

MAX6657 toc03

TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

FAIRCHILD 2N3906

-3

-2

-1

-55 -5-30 20 45 70 95 120

LOCAL TEMPERATURE ERROR

vs. DIE TEMPERATURE

MAX6657 toc04

TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

-1

-2

-3 10k 1M100k 10M 100M

TEMPERATURE ERROR vs.

POWER-SUPPLY NOISE FREQUENCY

MAX6657 toc05

FREQUENCY (Hz)

TEMPERATURE ERROR (°C)

VIN = SQUARE WAVE APPLIED TO V

WITH NO 0.1µF VCC CAPACITOR

-1

-2

-3

0.01k 100k1k 10M 1G

TEMPERATURE ERROR vs.

COMMON-MODE NOISE FREQUENCY

MAX6657 toc06

FREQUENCY (Hz)

TEMPERATURE ERROR (°C)

VIN = AC-COUPLED TO DXN V

= 100mVp-p

-1

-2

-3 10k 1M100k 10M 100M

TEMPERATURE ERROR vs.

DIFFERENTIAL-MODE NOISE FREQUENCY

MAX6657 toc07

FREQUENCY (Hz)

TEMPERATURE ERROR (°C)

VIN = 10mV

P-P

SQUARE WAVE

APPLIED TO DXP-DXN

-5

-4

-3

-2

-1

0405020 3010 60 70 80 90 100

TEMPERATURE ERROR vs.

DXP-DXN CAPACITANCE

MAX6657 toc08

DXP-DXN CAPACITANCE (nF)

TEMPERATURE ERROR (°C)

±1°C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

MAX6657/MAX6658/MAX6659

_______________________________________________________________________________________ 5

Pin Description

±1°C, SMBus-Compatible Remote/Local Temperature

Sensors with Overtemperature Alarms

MAX6657 MAX6658

11V

2 3 DXP

34DXN

46OVERT1

5 7, 8 GND Ground

69ALERT

7 12 SMBDATA SMBus Serial-Data Input/Output, Open-Drain

8 14 SMBCLK SMBus Serial-Clock Input

— 5 ADD

—10OVERT2

—15STBY

— 2, 11, 13, 16 N.C. Not internally connected. Do not make connections to these pins.

MAX6659

NAME FUNCTION

Supply Voltage Input, +3V to +5.5V. Bypass to GND with a 0.1µF capacitor. A 200Ω

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 Channel. DO NOT LEAVE DXP UNCONNECTED; connect DXP to DXN if no remote diode is used. Place a 2200pF capacitor between DXP and DXN for noise filtering.

Combined Remote-Diode Current Sink and A/D Negative Input. DXN is internally biased to one diode drop above ground.

Overtemperature Active-Low Output, Open-Drain. Output is logic low only when temperature is above the software programmed threshold.

SMBus Alert (Interrupt) Active-Low Output, Open-Drain. Asserts when temperature 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

ALERT

Response address. See

SMBus Address-Select Pin. The MAX6659 is set to one of three available addresses (connect to V

Overtemperature Active-Low Output, Open-Drain. Output is logic low only when temperature is above the software programmed threshold.

Hardware Standby Input. Temperature and comparison threshold data are retained in standby mode. If STBY is low, the IC is put into standby mode.

, GND, or leave open). See Slave Addresses section.

Interrupts.

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