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PDF ASC7611 Data sheet ( Hoja de datos )
| Número de pieza | ASC7611 | |
| Descripción | HARDWARE MONITOR | |
| Fabricantes | Andigilog | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ASC7611 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Preliminary Specification
Product Description
The aSC7611 has a two wire digital interface compatible
with SMBus 2.0. Using a 10-bit ΣΔ- ADC, the aSC7611
measures the temperature of two remote diode connected
transistors as well as its own die.
Using temperature information from these three zones, an
automatic fan speed control algorithm is employed to
minimize acoustic impact while achieving recommended
CPU temperature under varying operational loads.
To set fan speed, the aSC7611 has three independent
pulse width modulation (PWM) outputs that are controlled
by one, or a combination of three, temperature zones.
Both high- and low-frequency PWM ranges are supported.
The aSC7611 also includes a digital filter that can be
invoked to smooth temperature readings for better control
of fan speed and minimum acoustic impact. The aSC7611
has tachometer inputs to measure fan speed on up to four
fans. Limit and status registers for all measured values are
included to alert the system host that any measurements
are outside of programmed limits via status registers.
System voltages of VCCP, 2.5V, 3.3V, 5.0V, and 12V
motherboard power are monitored efficiently with internal
scaling resistors.
aSC7611
HARDWARE MONITOR
WITH INTEGRATED FAN CONTROL
PRODUCT SPECIFICATION
Measurement System
Temperature:
• 0.25°C resolution, ±2°C accuracy on remote diode
• 0.25°C resolution, ±3°C accuracy on local sensor
• Temperature measurement range on remote
sensor –55°C to +125°C using 2’s complement
coding.
Voltage:
• 10-bit Resolution, ±2% of Full Scale
Fan Tachometer:
• 16-bit count of 90kHz clock periods
Limit alarms for all measured values
Applications
• Desktop Computers – Motherboards and Graphics
Cards
• Laptop Computers
• Microprocessor based equipment (e.g. Base-
stations, Routers, ATMs, Point of Sales)
Features
• 2-wire, SMBus 2.0 compliant, serial interface
• 10-bit ΣΔ-ADC
• Monitors internal and remote thermal diodes
• Monitors VCCP, 2.5V, 3.3V, 5.0V, and 12V
motherboard/processor supplies
• Programmable autonomous fan control based on
temperature readings
• Noise filtering of temperature reading for fan
control
• 0.25°C digital temperature sensor resolution
• 3 PWM fan speed control outputs for 2-, 3- or 4-
wire fans.
• Provides high and low PWM frequency ranges
• 4 fan tachometer inputs
• Monitors 5 VID control lines
• 24-Lead QSOP package
• XOR-tree test mode
Connection Diagram
SMBDAT
1
SMBCLK
2
GND
3
3.3V
4
VID0
5
VID1 6 aSC7611
VID2
7
VID3
8
TACH3
9
PWM2
10
TACH1
11
TACH2
12
24
23
22
21
20
19
18
17
16
15
14
13
PWM1/
XTESTOUT
VCCP
2.5V
12V
5V
VID4
REMOTE 1+
REMOTE 1-
REMOTE 2+
REMOTE 2-
TACH4/
AddressSelect
PWM3/
AddressEnable
Ordering Information
Part Number
Package
aSC7611QS24
24-lead QSOP
Ayww – Assembly site, year, workweek
Temperature Range
and Operating Voltage
0°C to +120°C, 3.3V
Marking
aSC7611
Ayww
How Supplied
2500 units Tape & Reel
© Andigilog, Inc. 2006
-1-
www.andigilog.com
October 2006 - 70A05007
1 page  
aSC7611
DC Electrical Characteristics5
The following specifications apply for VDD = 3.0V to 3.6V, and all analog input source impedance Rs = 50Ω unless
otherwise specified in conditions. Boldface limits apply for TA = TJ over TMIN to TMAX; all other limits TA = TJ = 25°C. TA
is the ambient temperature of the aSC7611; TJ is the junction temperature of aSC7611; TD is the remote thermal diode
junction temperature. Specifications subject to change without notice
Parameter
Conditions
Min Typ Max
Units
POWER SUPPLY CHARACTERISTICS
Supply Current
Power-On Reset Threshold
Voltage
Converting, Interface and Fans
Inactive, Peak Current
Converting, Interface and Fans
inactive, Average Current
1.6
1.8
0.5
TEMPERATURE TO DIGITAL CONVERTER CHARACTERISTICS
Resolution
0.25
10
Remote Sensor Accuracy6
Temperature Accuracy using
Internal Diode7
External Diode Current Source
IDS
0°C ≤ T A ≤ +100°C,
0°C≤TD ≤+100°C,
3V≤VDD≤3.6V
0°C ≤ T A ≤ +120°C,
-55°C≤TD ≤+125°C,
3V≤VDD≤3.6V
0°C ≤ T A ≤ +120°C,
3V≤ V D D ≤ 3.6V
High Level
Low Level
±1
96
6
External Diode Current Ratio
16
ANALOG TO DIGITAL CONVERTER CHARACTERISTICS
Total Unadjusted Error8
TUE
Differential Non-linearity
DNL
1
Power Supply Sensitivity
±1
Total Monitoring Cycle Time9
All Voltage and Temperature
readings
182
Input Resistance, all analog
inputs
140 210
DIGITAL OUTPUT: PWM1, PWM2, PWM3, XTESTOUT
Logic Low Sink Current IOL VOL = 0.4V
Logic Low Level
VOL IOUT = +8mA
8
SMBUS OPEN-DRAIN OUTPUT: SMBDAT
Logic Low Output Voltage
VOL
High Level Output Current
IOH
SMBUS INPUTS: SMBCLK, SMBDAT
Logic Input High Voltage
VIH
Logic Input Low Voltage
VIL
Logic Input Hysteresis Voltage
VHYST
IOUT = +4mA
VOUT = V+
0.1
2.1
300
DIGITAL INPUTS: ALL
Logic Input High Voltage
VIH
2.1
3.5 mA(max)
mA
2.8 V
°C
Bits
±2 °C
±3 °C
±3 °C
µA(max)
µA
±2 %FS(max)
LSB
%/V
200 ms (max)
400 kΩ
mA (min)
0.4 V (max)
0.4 V (max)
10 µA(max)
V (min)
0.8 V (max)
mV
V (min)
© Andigilog, Inc. 2006
-5-
www.andigilog.com
October 2006 - 70A05007
5 Page 
aSC7611
Register Set
R/W
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
04h
R/W
Tach 1
Configuration
05h
R/W
Tach 2
Configuration
06h
R/W
Tach 3
Configuration
07h
R/W
Tach 4
Configuration
08h R Vccp (LS Byte)
09h R/W Configuration
0Eh
R
Zone 3 Temper-
ature (LS Byte)
0Fh
R/W
One shot
Measurement
10h
R
Zone 1 Temper-
ature (LS Byte)
11h R 3.3V (LS Byte)
12h R 5V (LS Byte)
13h R 2.5V (LS Byte)
14h R 12V (LS Byte)
15h
R
Zone 2 Temper-
ature (LS Byte)
20h R 2.5V (MS Byte)
21h R Vccp (MS Byte)
22h R 3.3 V (MS Byte)
23h R 5V (MS Byte)
24h R 12V (MS Byte)
25h
R
Zone 1 Temper-
ature (MS Byte)
26h
R
Zone 2 Temper-
ature (MS Byte)
Zone 3
27h R Temperature
(MS Byte)
28h R Tach 1 LS Byte
3-Wire
Enable1
3-Wire
Enable1
3-Wire
Enable1
3-Wire
Enable1
1
RES
1
RES
1
1
1
1
1
1
9
9
9
9
9
9
9
9
7
3-Wire
Enable0
3-Wire
Enable0
3-Wire
Enable0
3-Wire
Enable0
0
Run/
Stop
0
RES
0
0
0
0
0
0
8
8
8
8
8
8
8
8
6
Meas
Blank1
Meas
Blank1
Meas
Blank1
Meas
Blank1
X
RES
X
RES
X
X
X
X
X
X
7
7
7
7
7
7
7
7
5
Bit 4
Meas
Blank 0
Meas
Blank 0
Meas
Blank 0
Meas
Blank 0
X
RES
X
RES
X
X
X
X
X
X
6
6
6
6
6
6
6
6
4
Bit 3
Meas
Dwell 1
Meas
Dwell 1
Meas
Dwell 1
Meas
Dwell 1
X
RES
X
RES
X
X
X
X
X
X
5
5
5
5
5
5
5
5
3
Bit 2
Meas
Dwell 0
Meas
Dwell 0
Meas
Dwell 0
Meas
Dwell 0
X
RES
X
RES
X
X
X
X
X
X
4
4
4
4
4
4
4
4
2
Bit 1
Meas
Duration
1
Meas
Duration
1
Meas
Duration
1
Meas
Duration
1
X
RES
X
RES
X
X
X
X
X
X
3
3
3
3
3
3
Bit 0
(LSB)
Meas
Duration
0
Meas
Duration
0
Meas
Duration
0
Meas
Duration
0
X
RES
De-
fault
Value
(hex)
36
36
36
36
00
00
X 00
RES
00
X 00
X 00
X 00
X 00
X 00
X 00
2 00
2 00
2 00
2 00
2 00
2 00
3 2 00
3 2 00
1 0 00
29h R Tach 1 MS Byte
15
14 13 12
11
10
9
8 00
2Ah R Tach 2 LS Byte
7
65 4
3
2
1
0 00
2Bh R Tach 2 MS Byte
15
14 13 12
11
10
9
8 00
© Andigilog, Inc. 2006
- 11 -
www.andigilog.com
October 2006 - 70A05007
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ASC7611.PDF ] | |
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