參數(shù)資料
型號： AMC6821SDBQ
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)： 36/47頁
文件大小： 547K
代理商： AMC6821SDBQ
www.ti.com
P
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
Fan Characteristics Register (Address 0x20, Value After Power-On or Reset = 0x1D)
BIT
7
NAME
FSPD
DEFAULT
0
DESCRIPTION
Fast Spin Disable Bit
When FSPD = 1, the fan spin-up process is disabled.
When FSPD = 0, the fan spin-up process is enabled.
Reserved
PWM Frequency Bits
PWM2
When PWM-MODE pin is floating or tied to V
DD
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
When PWM-MODE pin is tied to GND
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Spin-Up Time Bit
6
5
4
3
0
0
0
1
1
PWM2
PWM1
PWM0
PWM1
PWM0
PWM Frequency
0
1
0
1
0
1
0
1
10Hz
15Hz
23Hz
30Hz (Default)
38Hz
47Hz
62Hz
94Hz
0
1
0
1
0
1
0
1
1kHz
10kHz
20kHz
25kHz (Default)
30kHz
40kHz
40kHz
40kHz
2
STIME2
1
Spin-Up Time
(in Seconds)
0.2
0.4
0.6
0.8
1
2 (Default)
4
8
1
STIME1
0
STIME2
0
0
0
0
1
1
1
1
STIME1
0
0
1
1
0
0
1
1
STIME0
0
1
0
1
0
1
0
1
0
STIME0
1
This register specifies the PWM frequency and the fan spin-up functions.
Fan Spin Disable Bit: FSPD
This bit enables or disables the spin-up function.
PWM Frequency Bits: [PWM2:PWM0]
These bits specify the PWM frequency; the high range (1kHz–40kHz) has a default value of 25kHz, and the low
range (10Hz–94Hz) has a default value of 30Hz. The clock frequency is 12.8MHz. The PWM-MODE pin
determines which range is selected. When the PWM mode is tied to ground, the high range is selected;
otherwise, the low range is selected.
Spin-Up Time Bits: [STIME2:STIME0]
These bits specify a predetermined time period, or spin-up time, during which the 100% duty cycle is applied to
start the fan spinning. These bits are ignored when FSPD = 1.
36
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