MAXIM MAX6693 Technical data

General Description

The MAX6693 precision multichannel temperature sen­sor monitors its own temperature and the temperatures
of up to six external diode-connected transistors. All
temperature channels have programmable alert thresh­olds. Channels 1, 4, 5, and 6 also have programmable
overtemperature thresholds. When the measured tem­perature of a channel exceeds the respective thresh­old, a status bit is set in one of the status registers. Two
open-drain outputs, OVERT and ALERT, assert corre­sponding to these bits in the status register.

The 2-wire serial interface supports the standard system
management bus (SMBus™) protocols: write byte, read
byte, send byte, and receive byte for reading the tem­perature data and programming the alarm thresholds.

The MAX6693 is specified for an operating temperature
range of -40°C to +125°C and is available in a 20-pin
TSSOP package.

Applications

Desktop Computers
Notebook Computers
Workstations
Servers

Features

o Six Thermal-Diode Inputs

o Beta Compensation (Channel 1)

o Local Temperature Sensor

o 1.5°C Remote Temperature Accuracy (+60°C to

+100°C)

o Temperature Monitoring Begins at POR for Fail-

Safe System Protection

o ALERT and OVERT Outputs for Interrupts,

Throttling, and Shutdown

o STBY Input for Hardware Standby Mode

o Small, 20-Pin TSSOP Package

o 2-Wire SMBus Interface

MAX6693

7-Channel Precision Temperature Monitor

with Beta Compensation

________________________________________________________________

Maxim Integrated Products

1

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.

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

GND

SMBCLK

SMBDATA

DXN2

DXP2

DXN1

DXP1

V

CC

N.C.

DXN4

DXP4

DXN3

DXP3

12

11

9

10

DXP6

DXN6DXN5

DXP5

MAX6693

ALERT

OVERT

STBY

100pF

100pF

100pF

100pF

100pF

CPU

100pF

GPU

0.1μF

TO SYSTEM
SHUTDOWN

INTERRUPT
TO μP

DATA

CLK

4.7kΩ
EACH

+3.3V

Typical Application Circuit

19-4096; Rev 0; 5/08

SMBus is a trademark of Intel Corp.

Pin Configuration appears at end of data sheet.

Ordering Information

+

Denotes a lead-free package.

Note: Slave address is 1001 101.

PART TEMP RANGE PIN-PACKAGE

MAX6693UP9A+ -40°C to +125°C 20 TSSOP

MAX6693

7-Channel Precision Temperature Monitor
with Beta Compensation

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.

VCC, SMBCLK, SMBDATA, ALERT, OVERT,

STBY to GND ....................................................-0.3V to +6.0V

DXP_ to GND..............................................-0.3V to (V

CC

+ 0.3V)

DXN_ to GND ........................................................-0.3V to +0.8V

SMBDATA, ALERT, OVERT Current....................-1mA to +50mA

DXN_ Current......................................................................±1mA

Continuous Power Dissipation (T

A

= +70°C)
20-Pin TSSOP

(derate 13.6mW/°C above +70°C) .............................1084mW

Junction-to-Case Thermal Resistance (θ

JC

) (Note 1)

20-Pin TSSOP...............................................................20°C/W

Junction-to-Ambient Thermal Resistance (θ

JA

) (Note 1)

20-Pin TSSOP............................................................73.8°C/W

ESD Protection (all pins, Human Body Model) ....................±2kV

Operating Temperature Range .........................-40°C to +125°C

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

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

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

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, V

STBY

= VCC, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA=

+25°C.) (Note 2)

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V

Software Standby Supply Current I

Operating Current I

Temperature Resolution

3 σ Temperature Accuracy
(Remote Channel 1)

3 σ Temperature Accuracy
(Remote Channels 2–6)

3 σ Temperature Accuracy
(Local)

6 σ Temperature Accuracy
(Remote Channel 1)

6 σ Temperature Accuracy
(Remote Channels 2–6)

6 σ Temperature Accuracy
(Local)

Supply Sensitivity of Temperature
Accuracy

Remote Channel 1 Conversion
Time

Remote Channels 2–6
Conversion Time

CC

SS

CC

t

CONV1

t

CONV_

SMBus static 3 10 µA

During conversion (Note 3) 500 2000 µA

Channel 1 only 11

Other diode channels 8

VCC = 3.3V,

ß = 0.5

V

= 3.3V

CC

V

= 3.3V

CC

VCC = 3.3V,

ß = 0.5

V

= 3.3V

CC

V

= 3.3V

CC

TA = TRJ = +60°C to +100°C -1.5 +1.5

= TRJ = 0°C to +125°C -2.375 +2.375

T

A

TA = TRJ = +60°C to +100°C -2 +2

= TRJ = 0°C to +125°C -2.5 +2.5

T

A

TA = +60°C to +100°C -2 +2

= 0°C to +125°C -2.5 +2.5

T

A

TA = TRJ = +60°C to +100°C -3 +3

T

= TRJ = 0°C to +125°C -4 +4

A

TA = TRJ = +60°C to +100°C -3 +3

= TRJ = 0°C to +125°C -3.5 +3.5

T

A

TA = +60°C to +100°C -2.5 +2.5

= 0°C to +125°C -3 +3

T

A

3.0 3.6 V

190 250 312 ms

95 125 156 ms

±0.2

Bits

°C

°C

°C

°C

°C

°C

o

C/V

MAX6693

7-Channel Precision Temperature Monitor

with Beta Compensation

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, V

STBY

= VCC, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA=

+25°C.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Remote-Diode Source Current I

Undervoltage-Lockout Threshold UVLO Falling edge of V

Undervoltage-Lockout Hysteresis 90 mV

Power-On Reset (POR) Threshold VCC falling edge 1.20 2 2.25 V

POR Threshold Hysteresis 90 mV

ALERT, OVERT

Output Low Voltage V

Output Leakage Current 1µA

SMBus INTERFACE (SMBCLK, SMBDATA), STBY

Logic-Input Low Voltage V

Logic-Input High Voltage V

Input Leakage Current -1 +1 µA

Output Low Voltage V

Input Capacitance C

SMBus-COMPATIBLE TIMING (Figures 3 and 4) (Note 4)

Serial-Clock Frequency f

Bus Free Time Between STOP
and START Condition

START Condition Setup Time

Repeat START Condition Setup
Time

START Condition Hold Time t

STOP Condition Setup Time t

High level, channel 1 500

RJ

OL

OL

SMBCLK

t

BUF

t

SU:STA

HD:STA

SU:STO

Low level, channel 1 20

High level, channels 2–6 80 100 120

Low level, channels 2–6 8 10 12

disables ADC 2.30 2.80 2.95 V

CC

I

= 1mA 0.3

SINK

I

= 6mA 0.5

SINK

IL

VCC = 3.0V 2.2 V

IH

I

= 6mA 0.3 V

SINK

IN

(Note 5) 400 kHz

f

f

f

f

90% of SMBCLK to 90% of SMBDATA,
f

90% of SMBCLK to 90% of SMBDATA,
f

10% of SMBDATA to 90% of SMBCLK 0.6 µs

90% of SMBCLK to 90% of SMBDATA,
f

90% of SMBCLK to 90% of SMBDATA,
f

= 100kHz 4.7

SMBCLK

= 400kHz 1.6

SMBCLK

= 100kHz 4.7

SMBCLK

= 400kHz 0.6

SMBCLK

= 100kHz

SMBCLK

= 400kHz

SMBCLK

= 100kHz

SMBCLK

= 400kHz

SMBCLK

0.6

0.6

4

0.6

5pF

0.8 V

µA

V

µs

µs

µs

µs

MAX6693

7-Channel Precision Temperature Monitor
with Beta Compensation

4 _______________________________________________________________________________________

Note 2: All parameters are tested at TA= +85°C. Specifications over temperature are guaranteed by design.
Note 3: Beta = 0.5 for channel 1 remote transistor.
Note 4: Timing specifications are 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 +3.6V, V

STBY

= VCC, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA=

+25°C.) (Note 2)

Clock-Low Period t

Clock-High Period t

Data Hold Time t

Data Setup Time t

Receive SMBCLK/SMBDATA
Rise Time

Receive SMBCLK/SMBDATA Fall
Time

Pulse Width of Spike Suppressed t

SMBus Timeout t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LOW

HIGH

HD:DAT

SU:DAT

t

R

t

F

SP

TIMEOUT

10% to 10%, f

10% to 10%, f

90% to 90% 0.6 µs

f

f

f

f

f

f

SMBDATA low period for interface reset 25 37 45 ms

= 100kHz 300

SMBCLK

= 400kHz (Note 6) 900

SMBCLK

= 100kHz 250

SMBCLK

= 400kHz 100

SMBCLK

= 100kHz 1

SMBCLK

= 400kHz 0.3

SMBCLK

= 100kHz 1.3

SMBCLK

= 400kHz 1.3

SMBCLK

300 ns

050ns

µs

ns

ns

µs

MAX6693

7-Channel Precision Temperature Monitor

with Beta Compensation

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VCC= 3.3V, V

STBY

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

SOFTWARE STANDBY SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6693 toc01

SUPPLY VOLTAGE (V)

STANDBY SUPPLY CURRENT (μA)

3.2 3.53.43.33.1

3.6

3.2

3.1

3.3

3.4

3.5

3.6

3.7

3.8

3.0

3.0

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6693 toc02

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (μA)

3.2

3.63.4

440

420

460

480

500

540

520

560

580

400

3.0

LOW BETA DIODE CONNECTED TO
CHANNEL 1 WITH RESISTANCE
CANCELLATION AND LOW BETA

-3

-2

-1

0

1

2

3

4

0 255075100125

LOCAL TEMPERATURE ERROR

vs. DIE TEMPERATURE

MAX6693 toc04

DIE TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

-5

-2

-3

0

-1

2

1

-4

4

3

5

05025 75 100 125

REMOTE-DIODE TEMPERATURE ERROR

vs. REMOTE-DIODE TEMPERATURE

MAX6693 toc03

REMOTE-DIODE TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

CHANNEL 2

CHANNEL 1

REMOTE-DIODE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY

MAX6693 toc05

FREQUENCY (MHz)

TEMPERATURE ERROR (°C)

-4

-3

-2

-1

0

1

2

3

4

5

-5

0.001 1.000 10.0000.010 0.100

100mV

P-P

CHANNEL 2

CHANNEL 1

LOCAL TEMPERATURE ERROR

vs. POWER-SUPPLY NOISE FREQUENCY

MAX6693 toc06

FREQUENCY (MHz)

TEMPERATURE ERROR (°C)

0.010 1.000

-4

-3

-2

-1

0

1

2

3

4

5

-5

0.001 10.0000.100

100mV

P-P

CH 2 REMOTE-DIODE TEMPERATURE ERROR

vs. COMMON-MODE NOISE FREQUENCY

MAX6693 toc07

FREQUENCY (MHz)

TEMPERATURE ERROR (°C)

1.0

-4

-3

-2

-1

0

1

2

3

4

-5

0.1 10.0

100mV

P-P

MAX6693

7-Channel Precision Temperature Monitor
with Beta Compensation

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= 3.3V, V

STBY

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

CH 2 REMOTE-DIODE TEMPERATURE

ERROR vs. CAPACITANCE

MAX6693 toc09

CAPACITANCE (nF)

TEMPERATURE ERROR (°C)

10

-4

-3

-2

-1

0

1

2

3

4

5

-5
1 100

Pin Description

CH 1 REMOTE-DIODE TEMPERATURE

5

4

3

2

1

0

-1

-2

TEMPERATURE ERROR (°C)

-3

-4

-5

ERROR vs. CAPACITANCE

1 100

10

CAPACITANCE (nF)

MAX6693 toc08

PIN NAME FUNCTION

1 DXP1

2 DXN1 Base Inp ut for C hannel 1 Rem ote D i od e. C onnect to the b ase of a P N P tem p er atur e- sensi ng tr ansi stor .

3 DXP2

4 DXN2

5 DXP3

6 DXN3

7 DXP4

8 DXN4

Combined Current Source and A/D Positive Input for Channel 1 Remote Transistor. Connect to the
emitter of a low-beta transistor. Leave unconnected or connect to VCC if no remote transistor is used.
Place a 100pF capacitor between DXP1 and DXN1 for noise filtering.

Combined Current Source and A/D Positive Input for Channel 2 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to V
if no remote diode is used. Place a 100pF capacitor between DXP2 and DXN2 for noise filtering.

Cathode Input for Channel 2 Remote Diode. Connect the cathode of the channel 2 remote-diode­connected transistor to DXN2.

Combined Current Source and A/D Positive Input for Channel 3 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to V
if no remote diode is used. Place a 100pF capacitor between DXP3 and DXN3 for noise filtering.

Cathode Input for Channel 3 Remote Diode. Connect the cathode of the channel 3 remote-diode­connected transistor to DXN3.

Combined Current Source and A/D Positive Input for Channel 4 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave unconnected or connect to V
if no remote diode is used. Place a 100pF capacitor between DXP4 and DXN4 for noise filtering.

Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 4 remote-diode­connected transistor to DXN4.

CC

CC

CC