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| 型號： | AMC6821SDBQR |
| 英文描述： | Analog Monitor and Control Circuit |
| 中文描述： | 模擬監(jiān)視和控制電路 |
| 文件頁數(shù)： | 5/47頁 |
| 文件大?。?/td> | 547K |
| 代理商： | AMC6821SDBQR |
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DEVICE INFORMATION
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SCLK
SDA
SMBALERT
A0
A1
PWM-MODE
IN+
IN
-
PWM-OUT
TACH
OVR
NC
GND
V
DD
THERM
FAN-FAULT
AMC6821
SSOP-16
(body size: 5mm x 4mm)
TACH
OVR
NC
GND
A0
A1
PWM-MODE
IN+
1
2
3
4
12
11
10
9
AMC6821
(Thermal pad
must be connected
to GND.)
5
6
7
8
16
15
14
13
V
D
T
F
I
-
P
S
S
S
QFN-16
(body size: 4mm x 4mm)
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
TERMINAL FUNCTIONS
PIN NO.
NAME
SSOP
QFN
DESCRIPTION
PWM-OUT
1
16
Output, open-drain. PWM output to control fan speed.
TACH
2
1
Input. Fan tachometer input to measure the fan speed.
Digital output, open-drain, active low. Goes low when temperature reaches the critical shutdown threshold
or remote temperature sensor failed. (See the
Interrupt
section for details.)
OVR
3
2
NC
4
3
Not connected. Reserved for manufacturer's testing.
GND
5
4
System ground
V
DD
6
5
Power supply, +3 to +5V
Digital input/output (open-drain). As an output, an active low output indicates the temperature over the
THERM temperature limit. As an input, the pin provides an external fan control. When the pin is pulled
low by external signal, the THERM-IN bit is set, and the fan is set to full-speed.
THERM
7
6
FAN-FAULT
8
7
Open-drain output. Goes low when a fan failure is detected.
IN–
9
8
Negative analog differential input. Connected to cathode of external temperature-sensing diode.
Positive analog differential input. Connected to anode of external temperature-sensing diode
Pentium-IV substrate transistor or general-purpose 2N3904 type transistor.
IN+
10
9
Digital input, PWM mode selection. When tied low (GND), the high PWM frequency range (1kHz to
40kHz) is selected. When tied to V
DD
or floated, the low PWM frequency range (10Hz to 94Hz) is
selected.
PWM-MODE
11
10
A1
12
11
Device slave address selection pin (see the
SMB Interface
section for details).
A0
13
12
Device slave address selection pin (see the
SMB Interface
section for details).
SMBALERT
14
13
Digital output, open-drain, SMBALERT, active low. Requires a pull-up resistor (2.2k
typical).
Bi-directional digital I/O pin, SMBus data, open-drain. Requires a pull-up resistor (2.2k
typical).
Digital input, SMBus clock. Requires a pull-up resistor (2.2k
typical).
SDA
15
14
SCLK
16
15
5
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