SX8733/SX8743/SX8744
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Precision Diode Digital Temperature
For Up To 3 External Sensors
SX8733
P1
1
2
D1-
D2+
D2-
D1+
AL1 AL2
6
5
4
P2
ALARM
VSS
+
-
+
-
MUX
+ ADC
-
VDD
SMBDAT
3
SMBUS
SMBCLK
VDD
P3
P2
P1
V
1
2
3
4
D1+
D1-
D2+
D2-
D3+
D3-
SX8743
AL1 AL2
8
ALARM
SMBCLK
SMBDAT
P4
VDD
P1
P2
NC
1
2
D1+
D1-
SX8744
AL1 AL2
8
ALARM
SMBCLK
SMBDAT
P4
7
6
5
7
6
5
+
-
+
-
+
-
+
-
+
-
General Description
The SX8733, SX8743 and SX8744 are digital temperature
sensors with a 2-wire SMBus interface. It provides a low-
cost solution to monitor the temperature of remote diodes
as well as its own temperature with an on-chip PN junction
sensor.
Depending on the device version, 2, 3 or 4 programmable
ports are included. They offer the possibility to trig under- /
over- temperature alarms which can be used as an interrupt
or to connect up to 3 external sensors in single-ended
mode or 2 external sensors in differential mode.
The parasitic resistances in series with the temperature
monitoring diode can be cancelled by an algorithmic, a 3-
point or a Kelvin (4-wire) method.
The SX8744 is pin-to-pin compatible with the LM86 part.
The SX8733 (2 programmable ports) is available in MLPD-
6 package. The SX8743 (4 programmable ports) and
SX8744 (3 programmable ports) are available in MSOP-8
package.
MUX
MUX
+ ADC
-
3
4
D2+
D2-
+ ADC
-
SMBUS
SMBUS
VSS
VSS
Key Product Features
1 Internal and Up To 3 External Sensors
Remote Diode Temp. Accuracy of ±0.5
°
C on the Temp.
Range 25
°
C to 100
°
C
2 Temp. Output Formats: 0
°
C to 127
°
C and -40
°
C to
140
°
C With 0.125
°
C Resolution
Parasitic Series Resistance Cancellation: Algorithmic, 3-
point and Kelvin (4-wire)
Under-/ Over- Temp. Alarms With Programmable
Thresholds
Programmable Conversion Rate For Optimal Power
Consumption
250 uA Active Current @ 10Hz Sampling Rate
SMBus v2.0 Interface Supports TIMEOUT
Pb-Free, Halogen Free, RoHS/WEEE Compliant
Product
Applications
Printer
Server
Set Top Box
Projector
Batteries charger monitoring
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Ordering Information
Part Number
Feature
2 Programmable ports
4 Programmable ports
3 Programmable ports
Package
MLPD-6
MSOP-8
MSOP-8
SX8733EWLTRT
SX8743EMSTRT
SX8744EMSTRT
Page 1
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SX8733/SX8743/SX8744
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
Page
1.
Electrical Characteristics ......................................................................................................................................... 3
1.1.
1.2.
1.3.
1.4.
1.5.
2.
2.1.
2.2.
3.
3.1.
3.2.
3.3.
3.4.
3.5.
Sensor Temperature Definition ........................................................................................................................ 3
Absolute Maximum Ratings ............................................................................................................................. 3
Electrical Specification ..................................................................................................................................... 4
SMBus Timing Characteristics......................................................................................................................... 5
SMBus Timing Waveforms .............................................................................................................................. 5
Pinout............................................................................................................................................................... 6
Pin Description................................................................................................................................................. 6
General Presentation ....................................................................................................................................... 7
Modes .............................................................................................................................................................. 7
Differential and Single-Ended External Sensor.............................................................................................. 10
Measurement Principle .................................................................................................................................. 10
Parasitic Track Resistance Cancellation........................................................................................................ 10
Algorithmic Track Resistance Cancellation............................................................................................ 10
3-Point Track Resistance Cancellation ................................................................................................... 10
The Kelvin (4-wire) Track Resistance Cancellation ................................................................................ 11
DATASHEET
Pin Configuration ..................................................................................................................................................... 6
Configuration ........................................................................................................................................................... 7
3.5.1.
3.5.2.
3.5.3.
3.6.
3.7.
3.8.
3.9.
4.
5.
6.
4.1.
Temperature Acquisition Sequence............................................................................................................... 11
Alarm.............................................................................................................................................................. 12
Temperature Data Format ............................................................................................................................. 12
Continuous Time Vs. Single Shot .................................................................................................................. 13
Typical Temperature Sensing System With A SX8743.................................................................................. 13
Application Note .................................................................................................................................................... 13
Power-Up Sequence and Standby Mode .............................................................................................................. 14
Serial Interface ...................................................................................................................................................... 14
6.1.
6.2.
6.3.
6.4.
6.5.
Register Write - Combined Format ................................................................................................................ 14
Register Write - Direct Format ....................................................................................................................... 14
Register Read - Combined Format ................................................................................................................ 15
Register Read - Direct Format ....................................................................................................................... 15
Soft Reset ...................................................................................................................................................... 15
Memory Map .................................................................................................................................................. 16
Registers Description..................................................................................................................................... 16
MLPD-W6-EP2 Package Outline Drawing..................................................................................................... 20
MLPD-W6-EP2 Land Pattern Drawing........................................................................................................... 21
Package Outline Drawing: MSOP-8............................................................................................................... 22
Land Pattern Drawing: MSOP-8 .................................................................................................................... 23
7.
Register / Memory Map ......................................................................................................................................... 16
7.1.
7.2.
8.
Packaging Information ........................................................................................................................................... 20
8.1.
8.2.
8.3.
8.4.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 2
www.semtech.com
SX8733/SX8743/SX8744
Digital temperature sensor
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
1. Electrical Characteristics
1.1. Sensor Temperature Definition
Parameter
Local sensor diode temperature (chip junction temperature)
External diode temperature (remote diode junction temperature)
Symbol
T
J
T
D
1.2. Absolute Maximum Ratings
Stresses above the values listed below may cause permanent device failure. Exposure to absolute maximum ratings for
extended periods may affect device reliability. Operation outside the parameters specified in the Electrical Characteristics
section is not implied.
Parameter
Power supply to VSS
Storage temperature
Ambient operating temperature
Input voltage on programmable
pin
Input voltage on SMBUS pin
Input current on any pin
Peak reflow temperature
Latchup
Symbol
V
DD,ABSMAX
T
J,STORE
T
J,ABSMAX
V
PIN,ABSMAX
V
PIN,SMBUS
I
PIN,ABSMAX
T
PKG
I
LUP
HBM
Conditions
Min
-0.5
-50
-40
Max
5.75
150
140
V
DD
+ 0.25
5.75
10
260
Unit
V
°
C
°
C
V
V
mA
°
C
mA
kV
V
V
P1, P2, P3, P4
SMBCLK, SMBDAT
-0.5
-0.5
-10
-100
Human Body Model
Machine Model
Charged Device Model
100
2
200
500
ESD
MM
CDM
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 3
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SX8733/SX8743/SX8744
Digital temperature sensor
ADVANCED COMMUNICATIONS & SENSING
1.3. Electrical Specification
All values valid within the operating conditions unless otherwise specified.
Parameter
Operating Conditions
Power supply
Operating temperature
Current Consumption
Active current
Current in standby mode
Temperature to Digital Converter
Temperature resolution
T
RESOL
T
D,ERR1
Remote temperature error
1
T
D,ERR2
T
J,ERR1
Local temperature
error
1
T
J,ERR2
Conversion time
t
CONV
I
2
Remote-diode source current
I
1
Alarm output low voltage
Leakage current
V
OL,AL
I
D,LEAK
Low level
I
OL
< 4mA
Standby mode
-1
10
0.4
1
uA
V
uA
T
J
= - 40° to 125°
C
C
10Hz sampling rate
High level
±1.5
100
100
°
C
ms
uA
T
J
= 25° to 85°
C
C
T
D
= - 40° to 125°
C
C
T
J
= 25° to 85°
C
C
-3
-2
±1.5
±0.75
3
2
°
C
°
C
T
J
= 25° to 85°
C
C
T
D
= 25° to 100°
C
C
-1.5
0.125
±0.5
1.5
°
C
°
C
I
VDD,ACTIVE
I
VDD,STDBY
10 Hz sampling rate
No track cancellation mode
250
10
400
40
uA
uA
V
DD
T
J
Operating temperature =
Junction temperature
2.7
-40
3.3
5.5
125
V
°
C
Symbol
Conditions
Min
Typ
Max
Unit
DATASHEET
SMBus - Compatible Interface SMBCLK & SMBDAT
Input logic high
Input logic low
Output logic low
Current leakage on SMBCLK/
SMBDAT
Capacitive load on SMBCLK/
SMBDAT
V
IH
V
IL
V
OL
I
LEAK,SMB
C
BUS
I
OL
< 4mA
-1
2.1
0.8
0.4
1
V
V
V
uA
5
pF
1. Specification with VDD=3.0V to 3.6V and track resistance cancellation disabled.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 4
www.semtech.com
SX8733/SX8743/SX8744
Digital temperature sensor
ADVANCED COMMUNICATIONS & SENSING
1.4. SMBus Timing Characteristics
Parameter
SMBus clock frequency
SMBus clock low time
SMBus clock high time
SMBus rise time
SMBus fall time
SMBDAT and SMBCLK time low
for reset of serial interface
Data setup time
Data hold time
1
Start condition hold time
(SMBDAT low to SMBCLK low)
Stop condition hold time
(SMBCLK high to SMBDAT high)
Repeated start-condition setup
time
(SMBCLK high to SMBDAT low)
SMBus free time between stop
and start conditions
1. The device provides a hold time of at least 300ns for the SMBDAT signal to bridge the undefined region of the falling edge of SMBCLK.
DATASHEET
Symbol
f
SMB
t
LOW
t
HIGH
t
R,SMB
t
F,SMB
t
TIMEOUT
t
SU,DAT
t
HD,DAT
t
HD,STA
t
SU,STO
Conditions
Min
10
1.3
0.6
Typ
Max
400
Unit
kHz
us
us
300
300
25
100
0
0.6
35
ns
ns
ms
ns
ns
us
0.6
us
t
SU,STA
0.6
us
t
BUF
1.3
us
1.5. SMBus Timing Waveforms
SMBDAT
SMBCLK
t
SU,STA
t
HD,STA
t
LOW
t
HIGH
t
HD,DAT
t
SU,DAT
t
SU,STO
Stop
t
BUF
Start
Figure 1. SMBUS Timing
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 5
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stm32/stm8
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