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(yè)數(shù)： 20/47頁(yè)
文件大?。?/td> 547K
代理商： AMC6821SDBQR
www.ti.com
P
Status Register Read
THERM Limit
Temperature
THERM
INT
SMBALERT
via
INT
SMBALERT
via
5
°
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
When the THERM limit is exceeded, the corresponding status flag bit (R-THERM or L-THERM of
Status
Register 1
or
Status Register 2
) is set to '1', and the THERM interrupt through the SMBALERT pin is generated
if it is enabled (THERMOVIE of bit
Configuration Register 1
is set to '1'). This interrupt forces the SMBALERT
pin low. Reading the status registers clears the flag bit (R-THERM and L-THERM). Clearing the flag bit makes
the SMBALERT pin go back to high, but does not negate the THERM pin. It remains low until the temperature
falls 5°C below the exceeded THERM limit. After this bit is cleared, the active flag bit (R-THERM for remote
temperature or L-THERM for local temperature) and the THERM interrupt are not re-armed until the temperature
falls 5
°
C below the exceeded THERM limit. This procedure is shown in
Figure 14
.
Figure 14. Operation of the THERM Interrupt and the THERM Pin
When working as an output, the status of the THERM pin affects the RPM fan. If the THERM-FAN-EN bit is set
('1'), the fan goes to full-speed (that is, the duty cycle is 100%) when the THERM pin goes low. However, when
THERM-FAN-EN = 0, the status of the THERM pin does not affect the fan speed.
THERM Pin As An Input
When this pin works as input, it is the input of the external hardware control signal; the THERM-IN bit of
Status
Register 2
reflects the input. When the THERM pin is pulled low as an input, THERM-IN is set ('1') and the fan is
driven at full speed (that is, the duty cycle is 100%), no matter what THERM-FAN-EN is. The THERM-FAN-EN
bit has no effect when the THERM pin works as an input.
20
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