ASC7531A ETC2 [List of Unclassifed Manufacturers], ASC7531A Datasheet

no-image

ASC7531A

Manufacturer Part Number
ASC7531A
Description
LOW-VOLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR AND VOLTAGE MONITOR
Manufacturer
ETC2 [List of Unclassifed Manufacturers]
Datasheet
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
Ordering Information
© Andigilog, Inc. 2006
Ayww – Assembly site, year, workweek
aSC7531AM10
aSC7531BM10
Part Number
On-chip and remote temperature sensors
Accuracy:
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
Pb-free Matte Sn lead finish & RoHS Compliant
Packages
MSL-1 per JEDEC J-STD-020C
o
o
o
+/- 3°C over operational range
Internal +/- 2°C over 40°C to 70°C
Remote +/- 1°C over 50°C to 70°C
Package
10-Lead
10-Lead
MSOP
MSOP
Temp. Range and Operating Voltage
L
OW
-40°C to 125°C, 3.3V
-40°C to 125°C, 3.3V
-V
www.andigilog.com
OLTAGE
- 1 -
Pin Configuration
Applications
Desktop and Notebook Computers
Application Diagram
with aSC7531A
with aSC7531B
1-W
aSC7531A / aSC7531B
2N3904
CPU
IRE
GND
P
V
D+
12V
D
D-
SST
Interface
DD
RODUCT
IGITAL
ADD0
1
2
3
4
SST
5
aSC7531A/
aSC7531B
Marking
AND
Ayww
Ayww
531A
531B
T
EMPERATURE
10
9
3
4
S
V
aSC7531A/
OLTAGE
PECIFICATION
aSC7531B
December 2006 - 70A05012
1
3.3V
10
2
2500 units Tape &
2500 units Tape &
8
9
7
6
Supplied In
SST
ADD0
2.5V
VCCP
5V
Reel
Reel
M
S
ONITOR
ENSOR
5
8
7
6
12V
2.5V
V
5V
CCP

Related parts for ASC7531A

ASC7531A Summary of contents

Page 1

... 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 ...

Page 2

... The aSC7531 can be read at any time without interrupting the temperature conversion process. 9. For the aSC7531A, calibration of the remote diode sensor input is set to meet the accuracy limits with a diode-connected 2N3904 that has a non-ideality factor of 1.0046 with a series resistance of 0.6Ω. For the aSC7531B, calibration of the remote diode sensor input is set to meet the accuracy limits with a CPU substrate diode that has a non-ideality factor of 1.009 with a series resistance of 4.52Ω ...

Page 3

... Digital Input / Output. SST Bi-directional Data Line. ADC On-Chip Temperature Remote Temperature Remote Diode Open / Short Control and SST Interface VSS Figure 1. Block Diagram - 3 - www.andigilog.com aSC7531A / aSC7531B Description DD Vccp Voltage 2.5V Voltage 3.3V Voltage 5V Voltage 12V Voltage DIB Register ADD0 SST December 2006 - 70A05012 ...

Page 4

... Andigilog, Inc. 2006 aSC7531A / aSC7531B Device Power-on Timing Following a power-on reset, such as a system transitioning from S3-S5 to S0, the aSC7531 will be able to participate in ...

Page 5

... LSB. The lowest 3 bits are set to zero. Temperature Inputs The aSC7531A has an internal thermal sensor plus an external sensor using a remote diode. The remote sensor is calibrated for a 2N3904 NPN transistor that has a non- ideality (η) factor of approximately 1.0046. Use of the remote diode is discussed in the Applications Information section ...

Page 6

... Figure 3. Voltage Reading # Bits # Bits aSC7531 Sending Hex Value Hex Value 8 8 Read Length GetDIB Cmd 0x10 0xF7 8 8 DIB Byte 15 DIB Byte 16 (data) (data www.andigilog.com aSC7531A / aSC7531B Always Zero FCS 0xDC 8 FCS (data dependent) December 0 2006 - 70A05012 ...

Page 7

... Figure 7. ResetDevice() format targeting a non-default address 8 8 Target Address Write Length 0x00 0x01 Figure 8. ResetDevice() format targeting the default address © Andigilog, Inc. 2006 aSC7531A / aSC7531B 8 8 Read Length GetDIB Cmd 0x08 0xF7 8 8 DIB Byte 7 DIB Byte 8 (data) ...

Page 8

... FCS 0x1A 0x00 © Andigilog, Inc. 2006 8 Read Length Command 0x02 0x00 8 8 MSB FCS 0x0F 0x2D 8 8 Read Length Command 0x02 0x10 8 8 LSB MSB 0x30 Figure 10. Example Read of 12-Volt Value - 8 - www.andigilog.com aSC7531A / aSC7531B 8 8 FCS 0x90 December 2006 - 70A05012 ...

Page 9

... Example bus transaction to write to a sensor located at address 0x48. This example writes 2 consecutive locations (0x20 and 0x21) to values 0x25 and 0x28 Target Address Write Length 0x48 0x04 © Andigilog, Inc. 2006 pin. CCP 8 8 Read Length Command 0x00 0xE0 - 9 - www.andigilog.com aSC7531A / aSC7531B CCP December 2006 - 70A05012 ...

Page 10

... Read Data 0x25 Figure 12. Example Register Read 8 8 Read Length Command 0x00 0xE2 Figure 13. Vendor Command Enable 8 8 Read Length Command 0x00 0xE3 Figure 14. Vendor Command Disable - 10 - www.andigilog.com aSC7531A / aSC7531B 8 FCS 0x1B 8 FCS 0x28 0x37 8 FCS 0xE0 8 FCS 0xE7 December 2006 - 70A05012 ...

Page 11

... Table 4. Command Summary - 11 - www.andigilog.com aSC7531A / aSC7531B Rd Len Bytes Sent by Client 0 FCS 2 FCS/2/FCS 2 FCS/2/FCS 4 FCS/4/FCS Abort FCS 2 FCS/2/FCS 2 FCS/2/FCS 2 FCS/2/FCS 2 ...

Page 12

... Support Support Figure 16. Device Capabilities Field Minor Revision 0000 (default) 0000 Figure 17. Version / Revision Field Stored Value (LS,MS) 0x7531 0x3175 - 12 - www.andigilog.com aSC7531A / aSC7531B 8 Device Interface 24 8 Client Vendor Device Specific ID Address LSB Slow Device 0 LSB for V1.0 Pre-production for V1.0 Production ...

Page 13

... SST Client Device Address is set according to the connection of the ADD0 pin. The combination part appears to software as two sensors, a simple temperature and a simple voltage sensor residing at the same address. Float is defined as an unconnected pin. ADD0 Address Ground 0x48 Float 0x49 V 0x4A DD © Andigilog, Inc. 2006 aSC7531A / aSC7531B Meaning Table 5. Device Interface Field - 13 - www.andigilog.com December 2006 - 70A05012 ...

Page 14

... Coulombs ratio of the two driving currents (10). The aSC7531A is designed and trimmed for an expected value of 1.0046, based on the typical value for the 2N3904. There is also a tolerance on the value provided. gives a representative sample of what one may expect in the range of non-ideality. ...

Page 15

... While it is important to minimize the distance to the remote diode to reduce high-frequency noise pickup, they may be located many feet away with proper shielding. Shielded, twisted-pair cable is recommended, connected only at the aSC7531A end as close as possible to the ground pin of the device 2N3904 2N3906 ...

Page 16

... The power consumption of the aSC7531 is relatively low and should have little self-heating effect on the local sensor reading. At the highest measurement rate the dissipation is less than 2mW, resulting in only a few tenths of a degree rise. © Andigilog, Inc. 2006 aSC7531A / aSC7531B - 16 - www.andigilog.com December 2006 - 70A05012 ...

Page 17

... A 0.94mm (max) A 0.05mm (min) 0.15mm (max www.andigilog.com aSC7531A / aSC7531B Detail B α 0° (min) 6° (max) 0.40mm (min) 0.70mm (max) 0.95mm BSC Detail B 2.85mm (min) 3.05mm (max) 2.90mm (min) 3.10mm (max) 4 ...

Page 18

... A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness. Andigilog, Inc. 8380 S. Kyrene Rd., Suite 101 Tempe, Arizona 85284 Tel: (480) 940-6200 Fax: (480) 940-4255 © Andigilog, Inc. 2006 aSC7531A / aSC7531B - 18 - www.andigilog.com December 2006 - 70A05012 ...

Related keywords