ASC7621 데이터 시트보기 (PDF) - Unspecified
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ASC7621 Datasheet PDF : 50 Pages
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aSC7621
Pin Descriptions
Symbol
SMBDAT
SMBCLK
PECI
Vtt
3.3V
GND
5V
12V
2.5V
VCCP
Remote 1+
Remote 1-
Remote 2+
Remote 2-
TACH1
TACH2
TACH3
TACH4/AddressSelect
PWM1/XTESTOUT
PWM2
PWM3/Address Enable
Pin
Type
Name and Function/Connection
1
Digital I/O
(Open-Drain)
System Management Bus Data. Open-drain output. 5V
tolerant, SMBus 2.0 compliant.
2 Digital Input
System Management Bus Clock. Tied to Open-drain
output. 5V tolerant, SMBus 2.0 compliant.
7 Digital I/O
Platform Environmental Control Interface (PECI). PECI 1.0
compliant, CPU digital thermometer input
8 Analog Input
PECI reference voltage.
4 POWER
+3.3V pin. Can be powered by +3.3V Standby power if
monitoring in low power states is required. This pin should
be bypassed with a 0.1μF capacitor in parallel with 100pF.
A bulk capacitance of approximately 10μF needs to be in
near vicinity of the aSC7621.
3 GROUND
Ground for all analog and digital circuitry.
20 Analog Input
Analog Input for +5V monitoring.
21 Analog Input
Analog Input for +12V monitoring.
22 Analog Input
Analog Input for +2.5V monitoring..
23 Analog Input
Analog Input for VCCP (processor voltage) monitoring.
Remote Thermal Positive input (current source) from the first remote thermal
18 Diode Positive diode Serves as the positive input into the A/D. Connected
Input
to THERMDA pin of Pentium processor.
Remote Thermal Negative input (current sink) from the first remote thermal
17 Diode Negative diode Serves as the negative input into the A/D. Connected
Input
to THERMDC pin of Pentium processor.
16
Remote Thermal
Diode Positive
Output
Positive input (current source) from the second remote
thermal diode Serves as the positive input into the A/D.
Connected to the base of a diode connected MMBT3904
NPN transistor.
15
Remote Thermal
Diode Negative
Input
Negative input (current sink) from the second remote
thermal diode Serves as the negative input into the A/D.
Connected to the emitter of a diode connected MMBT3904
NPN transistor.
11 Digital Input
Input for monitoring tachometer output of fan 1.
12 Digital Input
Input for monitoring tachometer output of fan 2.
9 Digital Input
Input for monitoring tachometer output of fan 3. During
power-up, if held low through a 10KΩ resistor, SMBus
address may be selected based on the state of TACH4 pin.
14 Digital Input
Input for monitoring tachometer output of fan 4. If in
Address Select Mode, determines the SMBus address of
aSC7621.
24
Digital Open-
Drain Output
Fan speed control 1. When in XOR tree test mode,
functions as XOR Tree output.
10
Digital Open-
Drain Output
Fan speed control 2.
13
Digital Open-
Drain Output
Fan speed control 3. Pull to ground at power on to enable
Address Select Mode (Address Select pin controls SMBus
address of the device).
© Andigilog, Inc. 2006
-3-
www.andigilog.com
October 2006 - 70A06010
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