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參數(shù)資料
| 型號(hào)： | 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)： | 13/47頁 |
| 文件大小： | 547K |
| 代理商： | AMC6821SDBQR |
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P
Remote Temperature Sensor Failure Detection
PWM Output
The PWM-Out pin is an open-drain output. When PWM-EN of
Configuration Register 2
is cleared ('0'), the
PWM-Out pin is disabled and goes into a high-impedance status. When PWM-EN is set ('1'), the PWM-Out pin
is enabled to drive the fan. When enabled, the status of the PWM-Out pin is determined by the PWM duty cycle
and phase bits (PWMINV of
Configuration Register 1
). When PWMINV = 0 (default), the PWM-Out pin goes low
for 100% duty cycle (suitable for driving the fan using a PMOS FET). Setting PWMINV to '1' makes the
PWM-Out pin go high (with an external pull-up resistor) for a 100% duty cycle. This setting is used to drive an
NMOS-power FET.
+5V
PWM-Out
ON
PWM
Control
AMC6821
PWM-EN
PWMINV = 0 (default) for driving the PMOS.
+5V
PWM-Out
ON
PWM
Control
AMC6821
PWM-EN
PWMINV = 1 for driving the NMOS.
PWM WAVEFORM SETTING
PWM frequency and duty cycle are programmable. The value of the
DCY Register
defines the duty cycle: it has
8-bit resolution, 1LSB corresponding to 1/255 (0.392%). Writing 0x00 sets the duty cycle to 0%; writing 0xFF
sets the duty cycle to 100%.
RPM reduces as the
duty cycle decreases.
Period
ON
OFF
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
The remote temperature sensor failure detection determines whether the remote sensor diode has an
open-circuit condition, short-circuit to ground, or a short-circuit (IN+) to (IN–) condition. This fault detection is
based on the analog input voltage and is not checked until the first monitoring cycle is completed after power-on.
Reading the fault sensor returns a value of –128
°
C (0x80). Since the power-on default value of the temperature
data registers is 0x80 (–128
°
C), a reading of 0x80 from the temperature data register immediately after
power-on does not indicate a diode fault condition. The remote temperature sensor failure can be only checked
after the first monitoring cycle has completed after power-on.
When a remote sensor failure occurs, the remote sensor failure bit (RTF in the Status Register) is set to '1', the
OVR pin is forced low, and an RTF interrupt is generated through the SMBALERT pin if the interrupt is enabled
(RTFIE = 1). Once this interrupt is generated, the RTF bit remains '1' and the OVR pin stays low until a
power-on reset or software reset is issued, whether or not the failure condition persists.
Figure 6. PWM Output
PWM frequency has two ranges: the high range is from 1kHz to 40kHz, and the low range is from 10Hz to 94Hz.
The PWM-MODE pin status determines which range is selected. When the PWM-MODE pin is tied to ground,
the high range is selected. Otherwise, the low range is selected. Bits [PWM2:PWM0] in the
Fan Characteristics
Register
define the frequency; see
Table 5
. The resolution of the PWM waveform period is 0.312
μ
s,
corresponding to a 3.2MHz clock. The default value after power-on is 30Hz when the low range is selected, or
25kHz when the high range is selected.
Figure 7. PWM Waveform (PWMINV = 1)
13
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| AMC69G-V30 | 制造商:Panasonic Industrial Company 功能描述:KNOB |
| AMC69R-1L0 | 制造商:Panasonic Industrial Company 功能描述:HOLDER |
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