19-4508; Rev 0; 1/99
L
MANUA
ION KIT HEET
AT
EVALU
TA S
WS DA
FOLLO
Remote/Local Temperature Sensor
with SMBus Serial Interface
____________________________Features
o
Two Channels: Measures Both Remote and Local
Temperatures
o
No Calibration Required
o
SMBus 2-Wire Serial Interface
o
Programmable Under/Overtemperature Alarms
o
Supports SMBus Alert Response
o
Supports Manufacturer and Device ID Codes
o
Accuracy
±2°C (+60°C to +100°C, local)
±3°C (-40°C to +125°C, local)
±3°C (+60°C to +100°C, remote)
o
3µA (typ) Standby Supply Current
o
70µA (max) Supply Current in Auto-Convert Mode
o
+3V to +5.5V Supply Range
o
Small 16-Pin QSOP Package
________________General Description
The MAX1617A (patents pending) is a precise digital ther-
mometer that reports the temperature of both a remote
sensor and its own package. The remote sensor is a
diode-connected transistor—typically a low-cost, easily
mounted 2N3904 NPN type—that replaces conventional
thermistors or thermocouples. Remote accuracy is ±3°C
for multiple transistor manufacturers, with no calibration
needed. The remote channel can also measure the die
temperature of other ICs, such as microprocessors, that
contain an on-chip, diode-connected transistor.
The 2-wire serial interface accepts standard System
Management Bus (SMBus®) Write Byte, Read Byte, Send
Byte, and Receive Byte commands to program the alarm
thresholds and to read temperature data. The data format
is 7 bits plus sign, with each bit corresponding to 1°C, in
two’s complement format. Measurements can be done
automatically and autonomously, with the conversion rate
programmed by the user or programmed to operate in a
single-shot mode. The adjustable rate allows the user to
control the supply-current drain.
The MAX1617A is nearly identical to the popular MAX1617,
but has improved SMBus timing specifications, improved
bus collision immunity, software manufacturer and device
identification available via the serial interface, and a power-
on reset function that can force a reset of the slave address
via the serial interface.
MAX1617 A
†
Ordering Information
PART*
MAX1617AMEE
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16 QSOP
________________________Applications
Desktop and Notebook
Computers
Smart Battery Packs
LAN Servers
Industrial Controls
Central Office
Telecom Equipment
Test and Measurement
Multichip Modules
*U.S.
and foreign patents pending.
Typical Operating Circuit
0.1µF
3V TO 5.5V
200Ω
V
CC
STBY
10k EACH
___________________Pin Configuration
TOP VIEW
N.C. 1
V
CC
2
DXP 3
DXN 4
N.C. 5
ADD1 6
GND 7
GND 8
16 N.C.
15 STBY
14 SMBCLK
MAX1617A
DXP
SMBCLK
SMBDATA
2N3904
DXN
2200pF
ALERT
CLOCK
DATA
INTERRUPT
TO
µC
MAX1617A
13 N.C.
12 SMBDATA
11 ALERT
10 ADD0
9
N.C.
ADD0 ADD1 GND
QSOP
SMBus is a registered trademark of Intel Corp.
†
Patents Pending
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Remote/Local Temperature Sensor
with SMBus Serial Interface
MAX1617A
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +6V
DXP, ADD_ to GND ....................................-0.3V to (V
CC
+ 0.3V)
DXN to GND ..........................................................-0.3V to +0.8V
SMBCLK, SMBDATA,
ALERT, STBY
to GND ...........-0.3V to +6V
SMBDATA,
ALERT
Current .................................-1mA to +50mA
DXN Current .......................................................................±1mA
ESD Protection (SMBCLK, SMBDATA,
ALERT,
Human Body Model) ......................................... 4000V
ESD Protection (other pins, Human Body Model)..............2000V
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 8.30mW/°C above +70°C) .....................667mW
Operating Temperature Range .........................-55°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
ADC AND POWER SUPPLY
Temperature Resolution (Note 1)
Initial Temperature Error,
Local Diode (Note 2)
Temperature Error, Remote Diode
(Notes 2 and 3)
Temperature Error, Local Diode
(Notes 1 and 2)
Supply-Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Power-On Reset Threshold
POR Threshold Hysteresis
Logic inputs
forced to V
CC
or GND
SMBus static
Hardware or software standby,
SMBCLK at 10kHz
0.25 conv/sec
2.0 conv/sec
94
-25
High level
Low level
80
8
100
10
0.7
ADD0, ADD1; momentary upon power-on reset
160
V
CC
, falling edge
1.0
V
CC
input, disables A/D conversion, rising edge
Monotonicity guaranteed
T
A
= +60°C to +100°C
T
A
= 0°C to +85°C
T
R
= +60°C to +100°C
T
R
= -55°C to +125°C
Including long-term drift
T
A
= +60°C to +100°C
T
A
= 0°C to +85°C
8
-2
-3
-3
-5
-2.5
-3.5
3.0
2.60
2.80
50
1.7
50
3
4
35
120
125
70
µA
180
156
25
120
12
ms
%
µA
V
µA
10
µA
2.5
2
3
3
5
2.5
3.5
5.5
2.95
Bits
°C
°C
°C
V
V
mV
V
mV
CONDITIONS
MIN
TYP
MAX
UNITS
Standby Supply Current
Average Operating Supply Current
Conversion Time
Conversion Rate Timing Error
Remote-Diode Source Current
DXN Source Voltage
Address Pin Bias Current
Auto-convert mode, average
measured over 4sec. Logic
inputs forced to V
CC
or GND.
From stop bit to conversion complete (both channels)
Auto-convert mode
DXP forced to 1.5V
2
_______________________________________________________________________________________
Remote/Local Temperature Sensor
with SMBus Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
SMBus INTERFACE
Logic Input High Voltage
Logic Input Low Voltage
Logic Output Low Sink Current
ALERT
Output High Leakage
Current
Logic Input Current
SMBus Input Capacitance
SMBus Clock Frequency
SMBCLK Clock Low Time
SMBCLK Clock High Time
SMBus Start-Condition Setup Time
SMBus Repeated Start-Condition
Setup Time
SMBus Start-Condition Hold Time
SMBus Stop-Condition Setup Time
SMBus Data Valid to SMBCLK
Rising-Edge Time
SMBus Data-Hold Time
SMBCLK Falling Edge to SMBus
Data-Valid Time
t
SU:STA
, 90% to 90% points
t
HD:STA
, 10% of SMBDATA to 90% of SMBCLK
t
SU:STO
, 90% of SMBCLK to 10% of SMBDATA
t
SU:DAT
, 10% or 90% of SMBDATA to 10% of SMBCLK
t
HD:DAT
(Note 5)
Master clocking in data
STBY,
SMBCLK, SMBDATA; V
CC
= 3V to 5.5V
STBY,
SMBCLK, SMBDATA; V
CC
= 3V to 5.5V
ALERT,
SMBDATA forced to 0.4V
ALERT
forced to 5.5V
Logic inputs forced to V
CC
or GND
SMBCLK, SMBDATA
(Note 4)
t
LOW
, 10% to 10% points
t
HIGH
, 90% to 90% points
DC
4.7
4
4.7
500
4
4
250
0
1
-1
5
100
6
1
1
2.2
0.8
V
V
mA
µA
µA
pF
kHz
µs
µs
µs
ns
µs
µs
ns
µs
µs
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1617A
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V,
T
A
= -55°C to +125°C,
unless otherwise noted.) (Note 6)
PARAMETER
ADC AND POWER SUPPLY
Temperature Resolution (Note 1)
Initial Temperature Error,
Local Diode (Note 2)
Temperature Error, Remote Diode
(Notes 2 and 3)
Supply-Voltage Range
Conversion Time
Conversion Rate Timing Error
From stop bit to conversion complete (both channels)
Auto-convert mode
Monotonicity guaranteed
T
A
= +60°C to +100°C
T
A
= -55°C to +125°C
T
R
= +60°C to +100°C
T
R
= -55°C to +125°C
8
-2
-3
-3
-5
3.0
94
-25
125
2
3
3
5
5.5
156
25
Bits
°C
°C
V
ms
%
CONDITIONS
MIN
TYP
MAX
UNITS
_______________________________________________________________________________________
3
Remote/Local Temperature Sensor
with SMBus Serial Interface
MAX1617A
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V,
T
A
= -55°C to +125°C,
unless otherwise noted.) (Note 6)
PARAMETER
SMBus INTERFACE
Logic Input High Voltage
Logic Input Low Voltage
Logic Output Low Sink Current
ALERT
Output High Leakage
Current
Logic Input Current
STBY,
SMBCLK, SMBDATA
V
CC
= 3V
V
CC
= 5.5V
2.2
2.4
0.8
6
1
-2
2
V
V
mA
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
STBY,
SMBCLK, SMBDATA; V
CC
= 3V to 5.5V
ALERT,
SMBDATA forced to 0.4V
ALERT
forced to 5.5V
Logic inputs forced to V
CC
or GND
Note 1:
Guaranteed but not 100% tested.
Note 2:
Quantization error is not included in specifications for temperature accuracy. For example, if the MAX1617A device temper-
ature is exactly +66.7°C, the ADC may report +66°C, +67°C, or +68°C (due to the quantization error plus the +1/2°C offset
used for rounding up) and still be within the guaranteed ±1°C error limits for the +60°C to +100°C temperature range
(Table 2).
Note 3:
A remote diode is any diode-connected transistor from Table 1. T
R
is the junction temperature of the remote diode. See
Remote Diode Selection
for remote diode forward voltage requirements.
Note 4:
The SMBus logic block is a static design that works with clock frequencies down to DC. While slow operation is possible, it
violates the 10kHz minimum clock frequency and SMBus specifications, and may monopolize the bus.
Note 5:
Note that a transition must internally provide at least a hold time in order to bridge the undefined region (300ns max) of
SMBCLK’s falling edge.
Note 6:
Specifications from -55°C to +125°C are guaranteed by design, not production tested.
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. PC BOARD RESISTANCE
MAX1617ATOC01
TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX1617ATOC02
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCY
V
IN
= SQUARE WAVE APPLIED TO
V
CC
WITH NO 0.1µF V
CC
CAPACITOR
TEMPERATURE ERROR (°C)
9
V
IN
= 250mVp-p
REMOTE DIODE
MAX1617ATOC04
20
2
12
TEMPERATURE ERROR (°C)
10
TEMPERATURE ERROR (°C)
PATH = DXP TO GND
1
ZETEX FMMT3904
0
MOTOROLA MMBT3904
SAMSUNG KST3904
-1
RANDOM
SAMPLES
-2
0
6
V
IN
= 250mVp-p
LOCAL DIODE
3
V
IN
= 100mVp-p
REMOTE DIODE
-10
PATH = DXP TO V
CC
(5V)
-20
1
3
10
30
100
LEAKAGE RESISTANCE (MΩ)
0
-50
0
50
TEMPERATURE (°C)
100
150
50
500
5k
50k
500k
5M
50M
FREQUENCY (Hz)
4
_______________________________________________________________________________________
Remote/Local Temperature Sensor
with SMBus Serial Interface
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
TEMPERATURE ERROR vs.
COMMON-MODE NOISE FREQUENCY
MAX1617ATOC05
MAX1617A
TEMPERATURE ERROR vs.
DIFFERENTIAL-MODE NOISE FREQUENCY
MAX1617ATOC03
TEMPERATURE ERROR vs.
DIFFERENTIAL-MODE NOISE FREQUENCY
V
IN
= 10mVp-p SQUARE WAVE
APPLIED TO DXP-DXN
TEMPERATURE ERROR (°C)
5
MAX1617ATOC06
30
V
IN
= SQUARE WAVE
AC COUPLED TO DXN
TEMPERATURE ERROR (°C)
V
IN
= 100mVp-p
20
5
10
TEMPERATURE ERROR (°C)
0
10
V
IN
= 50mVp-p
V
IN
= 25mVp-p
0
V
IN
= 3mVp-p SQUARE WAVE
APPLIED TO DXP-DXN
0
50
500
5k
50k
500k
5M
50M
FREQUENCY (Hz)
-5
50
500
5k
50k
500k
5M
50M
FREQUENCY (Hz)
-5
50
500
5k
50k
500k
5M
50M
FREQUENCY (Hz)
TEMPERATURE ERROR vs.
DXP–DXN CAPACITANCE
MAX1617ATOC07
STANDBY SUPPLY CURRENT
vs. CLOCK FREQUENCY
MAX1617ATOC08
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
ADD0, ADD1
= GND
60
SUPPLY CURRENT (µA)
MAX1617ATOC09
20
V
CC
= 5V
TEMPERATURE ERROR (°C)
35
30
SUPPLY CURRENT (µA)
25
SMBCLK IS
DRIVEN RAIL-TO-RAIL
®
100
V
CC
= 5V
20
15
10
V
CC
= 3.3V
5
20
10
ADD0, ADD1
= HIGH-Z
6
3
0
0
20
40
60
80
100
DXP–DXN CAPACITANCE (nF)
0
1k
10k
100k
1000k
SMBCLK FREQUENCY (Hz)
0
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
OPERATING SUPPLY CURRENT
vs. CONVERSION RATE
MAX1617ATOC10
RESPONSE TO THERMAL SHOCK
MAX1617ATOC11
500
V
CC
= 5V
AVERAGED MEASUREMENTS
400
SUPPLY CURRENT (µA)
125
100
TEMPERATURE (°C)
300
75
200
50
100
25
16-QSOP IMMERSED
IN +115°C FLUORINERT BATH
0
0 0.0625 0.125 0.25
0.5
1
2
4
8
CONVERSION RATE (Hz)
0
-2
0
2
4
TIME (sec)
6
8
10
Rail-to Rail is a registered trademark of Nippon Motorola, Ltd.
_______________________________________________________________________________________
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