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© Andigilog, Inc. 2006
www.andigilog.com
December 2006 - 70A05012
LOW-VOLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR
V
AND
OLTAGE
MONITOR
aSC7531A / aSC7531B
PRODUCT SPECIFICATION
Product Description
The aSC7531 is a high-precision CMOS temperature sensor
and voltage monitor with Simple Serial Transport (SST)
compatible serial digital interface, intended for use in PC
hardware monitor applications.
Communication of device capabilities, temperature and voltage
readings take place over the high-speed bi-directional SST
interface.
The SST temperature sensor provides a means for an analog
signal to travel over a digital bus enabling remote temperature
sensing in areas previously not monitored in the PC. The
temperature sensor supports an internal and external thermal
diode. aSC7531A is used with 2N3904 transistor connected as
a remote diode, aSC7531B is used with CPU substrate diode.
The aSC7531 is available in MSOP-10 surface mount
package.
Features
•
On-chip and remote temperature sensors
•
Accuracy:
o
+/- 3°C over operational range
o
Internal +/- 2°C over 40°C to 70°C
o
Remote +/- 1°C over 50°C to 70°C
•
Operational Range: -40°C to 125°C
•
Temperature resolution: 0.125°C
•
Voltage monitoring of 12V, 5V, 3.3V, 2.5V and Vccp
to +/- 2% accuracy, 7.8mV resolution
•
1-wire SST serial interface
•
Negotiable SST signaling rate up to 2-Mbps
•
Internally corrected for diode non-ideality and series
resistance
•
3-state address pin sets one of 3 SST bus address
0x48 through 0x4A
•
10-lead MSOP package
•
MSL-1 per JEDEC J-STD-020C
•
Pb-free Matte Sn lead finish & RoHS Compliant
Packages
Pin Configuration
SST
1
2
3
4
GND
D-
9
ADD0
VDD
D+
2.5V
8
Applications
Desktop and Notebook Computers
Application Diagram
Ordering Information
Part Number
Package
Temp. Range and Operating Voltage
Marking
Supplied In
aSC7531AM10
10-Lead
MSOP
-40°C to 125°C, 3.3V
531A
Ayww
2500 units Tape &
Reel
aSC7531BM10
10-Lead
MSOP
-40°C to 125°C, 3.3V
531B
Ayww
2500 units Tape &
Reel
Ayww – Assembly site, year, workweek
6
7
aSC7531A/
aSC7531B
VCCP
3.3V
aSC7531A/
aSC7531B
SST
Interface
SST
ADD0
1
3
4
10
2
9
12V
5
5V
12V
10
5
5V
2N3904
VCCP
2.5V
8
7
6
CPU
with aSC7531A
with aSC7531B
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