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PDF ASC7621 Data sheet ( Hoja de datos )
| Número de pieza | ASC7621 | |
| Descripción | HARDWARE MONITOR | |
| Fabricantes | Andigilog | |
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Preliminary Specification
aSC7621
HARDWARE MONITOR
WITH INTEGRATED FAN CONTROL
PRODUCT SPECIFICATION
Product Description
The aSC7621 has a two wire digital interface compatible
with SMBus 2.0. Using a 10-bit ΣΔ- ADC, the aSC7621
measures the temperature of two remote diode connected
transistors as well as its own die. Support for Platform
Environmental Control Interface (PECI) is included.
Using temperature information from these four 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 aSC7621 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 aSC7621 also includes a digital filter that can be
invoked to smooth temperature readings for better control
of fan speed and minimum acoustic impact. The aSC7621
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.
Features
• Supports PECI interface and monitors internal and
remote thermal diodes
• 2-wire, SMBus 2.0 compliant, serial interface
• 10-bit ΣΔ-ADC
• 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
speed control
• 0.25°C digital temperature sensor resolution
• 3 PWM fan speed control outputs for 2-, 3- or 4-
wire fans and up to 4 fan tachometer inputs
• Enhanced measured temperature to Temperature
Zone assignment.
• Provides high and low PWM frequency ranges
• 3 GPIO pins for custom use
• 24-Lead QSOP package
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% (TUE)
Fan Tachometer:
• 16-bit count of 90kHz clock periods
Limit alarms for all measured values
Applications
• Desktop Computers – Motherboards and Graphics
Cards
• Microprocessor based equipment (e.g. Base-
stations, Routers, ATMs, Point of Sales)
Connection Diagram
SMBDAT
SMBCLK
1
2
24 PWM1/
XTESTOUT
23 VCCP
GND
3
22 2.5V
3.3V
4
21 12V
GPIO2
GPIO1
5 20 5V
6 aSC7621 19 GPIO3
PECI
7
18 REMOTE 1+
Vtt 8
17 REMOTE 1-
TACH3
9
16 REMOTE 2+
PWM2
10
15 REMOTE 2-
TACH1
TACH2
11
12
14 TACH4/
AddressSelect
13 PWM3/
AddressEnable
Ordering Information
Part Number
Package
aSC7621QS24
24-lead QSOP
Ayww – Assembly site, year, workweek
© Andigilog, Inc. 2006
Temperature Range
and Operating Voltage
0°C to +120°C, 3.3V
-1-
www.andigilog.com
Marking
aSC7621
Ayww
How Supplied
2500 units Tape & Reel
October 2006 - 70A06010
1 page  
aSC7621
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 aSC7621; TJ is the junction temperature of aSC7621; 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
200
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 %(max)
LSB
%/V
250 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 - 70A06010
5 Page 
aSC7621
PECI
The aSC7621 is compatible with devices that are
compliant with Intel’s PECI 1.0 specifications. More
information on this interface may be found in their PECI
interface specifications.
Temperatures sent over the PECI interface from the CPU
are in Celsius degrees relative to the Thermal Control
Circuit (TCC) temperature stored internally in the CPU
and accessed only through BIOS. This is the temperature
limit where internal measures are taken to reduce power
dissipation. Fan speed control settings sent by the BIOS
over the SMBus to registers in the aSC7621 are made
using this relative temperature rather than the absolute
readings of remote or on-chip diodes.
As many as four CPU clients on the PECI bus are
addressed in the range of 0x30 to 0x33. Currently, each
address is a single-packaged device that may have up to
two domains or CPU-measured digital temperatures.
General Operation
The PECI host in aSC7621 performs the following
functions:
• Responds to SMBus configuration identifying the
presence of PECI clients and the Thermal Zone
associated with each client.
• Reads the PECI temperature of the domain(s) of
each client processor addressed.
• Stores the highest result from each PECI
address into Temperature Zone register
associated to the measurement received from
the client. (each address may be associated with
any one Temperature Zone.)
• Flags an error if no valid PECI temperature can
be read.
• Continuously monitors the state of the PECI
interface for fault conditions.
PECI temperatures assigned to a Temperature Zone are
reported over SMBus interface in Temperature Zone
registers also will be in the range 0°C to -127°C. The
format reported through Temperature Zone registers is
re-aligned to agree with diode measurements. It is stored
in two register locations in the following format with
integer high byte and fractional low byte to be consistent
with all other temperature reports:
Temperature
0° C
-1° C
-5° C
-32° C
-127° C
2’s Complement
Representation
High Byte
Low Byte
0000 0000 .0000 0000
1111 1111 .0000 0000
1111 1011 .0000 0000
1110 0000 .0000 0000
1000 0001 .0000 0000
Table 2 PECI Temperature Report Format
PECI Errors
A specific set of temperature reading value encodings,
well outside the operational range of 0°C to -127°C, are
reserved to signal temperature sensor faults on the CPU
to aSC7621 interface. These encodings are in the PECI
temperature format as delivered by the CPU and are
converted to the appropriate Interrupt Status Register 3
error bits described in the Interrupt Status register section
below.
PECI Temperature Format and Range
The PECI temperatures read from the processor will be in
the range 0°C to -127°C where 0°C is the hottest
temperature and has the following format:
Temperature
0° C
-1° C
-5° C
-32° C
-127° C
2’s Complement
Representation
0000 0000 00.00 0000
1111 1111 11.00 0000
1111 1110 11.00 0000
1111 1000 00.00 0000
1111 0000 01.00 0000
Table 1 Raw PECI Temperature Format
These readings are not accessible to the user but are
filtered, re-formatted and assigned to a Temperature
Zone. Filtered PECI Temperature readings are accessible
by the user before they are assigned to a Temperature
Zone by reading registers F6h through FDh. These
readings follow the format described in Table 2. The
© Andigilog, Inc. 2006
- 11 -
www.andigilog.com
October 2006 - 70A06010
11 Page | ||
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| PDF Descargar | [ Datasheet ASC7621.PDF ] | |
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