SX8733
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Precision Diode Digital Temperature
For Up To 3 External Sensors
SX8733
P1
1
2
D2+
D2-
D1+
D1-
AL1 AL2
6
5
4
P2
ALARM
VSS
+
-
+
-
R
ec
N o
ew m
m
D e
es
n
ig
d
e
ns d
fo
r
SMBDAT
MUX
+ ADC
-
VDD
3
SMBUS
SMBCLK
VDD
P3
P2
P1
1
2
3
4
D1+
D1-
D2+
D2-
D3+
D3-
SX8743
8
7
6
SMBCLK
VDD
P1
1
SX
SX8744
8
7
6
5
SMBCLK
SMBDAT
P4
AL1 AL2
AL1 AL2
ALARM
SMBDAT
P4
2
ALARM
+
-
+
-
+
-
D1+
D1-
+
-
General Description
The SX8733, SX8743 and SX8744 are digital temperature
gital temperatu
l temperat
sensors with a 2-wire SMBus interface. It provides
a
low-
cost solution to monitor the temperature
of remot
diodes
ture
e
remote
es
as well as its own temperature with an on-chip PN junction
h
P
nct
sensor.
Depending on the device version, 2, 3 or 4 programmable
rsion,
ogrammable
ammable
ports are included. They offer the possibility to trig under- /
er
poss
possi
under
over- temperature alarms which can be used as an interrupt
ms
w
h
ca
b
s
ed
int
inter
or to connect up to 3 external sensors in single-ended mode
erna
s
or 2 external sensors
in differen
ors differential mode.
ot
N
The parasitic resistances i series with the temperature
esistances
in
he
monitoring diode can be cancelled by an algorithmic, a 3-
ode
point or a Kelvin (4-wire method.
(4-wire)
n
(4-wir
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
X
+ ADC
-
P2
3
4
D2+
D2-
+
-
+ ADC
-
SMBUS
5
VSS
NC
SMBUS
VSS
Key Product Features
ey Produc
y
1 Internal and Up To 3 External Sensors
an
Remo
Remote Diode Temp. Accuracy of ±0.5
°
C on the Temp.
R
Range 25
°
C to 100
°
C
2 Temp. Output Formats: 0
°
C to 127
°
C and -40
°
C to
T
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
Ordering Information
Part Number
Feature
2 Programmable ports
4 Programmable ports
3 Programmable ports
Package
MLPD-6
MSOP-8
MSOP-8
SX8733EWLTRT
SX8743EMSTRT
SX8744EMSTRT
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 1
www.semtech.com
SX8733
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
Page
DATASHEET
1.
Electrical Characteristics ......................................................................................................................................... 3
1.1.
1.2.
1.3.
1.4.
1.5.
Sensor Temperature Definition ........................................................................................................................ 3
Absolute Maximum Ratings ............................................................................................................................. 3
.........
...
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
ncellation .......
lation ......
..........................
......................
3-Point Track Resistance Cancellation ........
cellation ................................................................................................... 10
ation
..........................
..............
The Kelvin (4-wire) Track Resistance Ca
stance
Cancellation................................................................................. 11
ation...........
ation...................
Electrical Specification ..................................................................................................................................... 4
...................
......
2.
Pin Configuration ..................................................................................................................................................... 6
............ ......
.......
2.1.
2.2.
3.
Configuration ........................................................................................................................................................... 7
.....................
................
3.1.
3.2.
3.3.
3.4.
3.5.
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
quence..........
ence........
....................
.........................
Alarm.............................................................................................................................................................. 12
.....................
..........
.... ................
...........
Temperature Data Format ............................................................................................................................. 12
ormat .............
................ .....
.........
Continuous Time Vs. Single Sh .................................................................................................................. 13
Shot ......................
...............
Typical Temperature Sensing System With A SX8743.................................................................................. 13
mperatur Sen
eratu Se
Application Note..................................................................................................................................................... 13
... ..............
.....................
Power-Up Sequence and Standby Mode .....
.............................................................................................................. 14
equence
ence
Serial Interface....................................................................................................................................................... 15
erface............
face..........
6.1.
6.2.
6.3.
6.4.
6.5.
Register Write - Combined Format ................................................................................................................ 15
gister
Writ
Register Write - Direct Format ....................................................................................................................... 15
er W
Register Read - Combined Format ................................................................................................................ 15
Register Read - Direct Format ....................................................................................................................... 16
Soft Reset ...................................................................................................................................................... 16
Memory Map .................................................................................................................................................. 17
Registers Description..................................................................................................................................... 17
MLPD-W6-EP2 Package Outline Drawing..................................................................................................... 21
MLPD-W6-EP2 Land Pattern Drawing........................................................................................................... 22
Package Outline Drawing: MSOP-8............................................................................................................... 23
Land Pattern Drawing: MSOP-8 .................................................................................................................... 24
Page 2
7.
Register / Memory Map ......................................................................................................................................... 17
7.1.
7.2.
8.
Packaging Information ........................................................................................................................................... 21
8.1.
8.2.
8.3.
8.4.
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
Revision V3.0/May 2011
©2011 Semtech Corp.
www.semtech.com
SX8733
Precision 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
Exposu e
xpos
a
ab
extended periods may affect device reliability. Operation outside the parameters specified in the Electrical Characteristics
ters
specifi
specifie
section is not implied.
N
ot
R
ec
N o
ew m
m
D e
es
n
ig de
ns
d
fo
r
Parameter
Symbol
Conditions
s
Min
in
-0.5
-5
-50
-
-4
-40
V
DD,ABSMAX
T
J,STORE
T
J,ABSMAX
V
PIN,ABSMAX
AX
V
PIN,SMBUS
N,SMBUS
MBUS
P1, P2, P P4
P3,
-0.5
S
SMBCLK, SMBDAT
-0.5
-10
I
PIN,ABSMAX
PIN,ABSM
T
PKG
P
I
LUP
P
-100
HBM
MM
Human Body Model
Machine Model
CDM
Charged Device Model
Page 3
Max
5.75
150
140
Unit
V
°
C
°
C
V
V
mA
°
C
mA
kV
V
V
Power supply to VSS
Storage temperature
Ambient operating temperature
Input voltage on programmable
pin
Input voltage on SMBUS pin
Input current on any pin
V
DD
+ 0.25
5.75
10
Peak reflow temperature
Latchup
260
100
2
ESD
200
500
Revision V3.0/May 2011
©2011 Semtech Corp.
www.semtech.com
SX8733
Precision 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
Power supply rise time
1
Power supply rise time
1
Operating temperature
V
DD
t
rise25
T
J
= 25°
C
2.7
3.3
5.5
1
V
ms
ms
125
°
C
Symbol
Conditions
Min
Typ
Max
Unit
DATASHEET
Current Consumption
Active current
ot
R
ec
N o
ew
m
m
D e
es
n
ig de
ns
d
fo
r
t
rise125
T
J
T
J
= 125°
C
0.5
0
0.
Operating temperature =
Junction temperature
-40
-4
I
VDD,ACTIV
E
10 Hz sampling rate
ing
ellation
on
No track cancellation mode
250
10
400
40
uA
uA
Current in standby mode
I
VDD,STDBY
Temperature to Digital Converter
Temperature resolution
T
RESOL
0.125
±0.5
°
C
1.5
°
C
T
D,ERR1
RR1
Remote temperature error
2
T
J
= 25° to 85°
C
C
T
D
= 25° to 100°
5°
C
C
-1.5
T
D,ERR2
T
J,ERR1
J,E
T
J,ERR2
RR2
t
CONV
I
2
I
1
T
J
= 25° to 85°
C
85
C
T
D
= -
40°
to 125°
C 125 C
T
J
=
25
C to 85°
25° t
C
-3
±1.5
3
2
°
C
°
C
°
C
ms
uA
uA
-2
±0.75
±1.5
100
Local temperature error
Conversion time
2
T
J
= - 40° to 125°
C
C
10Hz sampling rate
High level
Low level
100
10
Remote-diode source current
ource
curren
N
Alarm output low voltag
ow voltage
Leakage current
V
OL,AL
I
D,LEAK
I
OL
< 4mA
Standby mode
-1
0.4
1
V
uA
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
5
2.1
0.8
0.4
1
V
V
V
uA
pF
1. See Figure 10
2. Specification with VDD=3.0V to 3.6V and track resistance cancellation disabled.
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 4
www.semtech.com
SX8733
Precision 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
Symbol
f
SMB
t
LOW
t
HIGH
t
R,SMB
t
F,SMB
Conditions
Min
10
1.3
0.6
300
300
35
Typ
Max
400
Unit
kHz
us
us
ns
ns
ms
ns
ns
us
DATASHEET
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)
R
ec
N
o
ew
m
m
D e
es n
ig de
ns d
fo
r
t
TIMEOUT
t
SU,DAT
25
100
0
t
HD,DAT
t
HD,STA
0.6
t
SU,STO
0
0.6
t
SU,STA
A
0.6
t
BUF
1.3
t
SU,STA
t
HD,STA
t
LOW
t
HIGH
t
HD,DAT
t
SU,DAT
t
SU,STO
Start
us
us
SMBus free time between stop
and start conditions
us
1. The device provides a hold time of at least 300ns for the
SMBDAT
s
me
3
or
he
signal to bridge the undefined region of the falling edge of SMBCLK.
1.5. SMBus Timing Wav fo
ing Waveforms
g
f
SMBDAT
SMBCLK
t
BUF
N
ot
Stop
Figure 1. SMBUS Timing
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 5
www.semtech.com
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