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ADT7490
Enabling the SMBALERT Interrupt Output
The SMBALERT interrupt function is disabled by
default. Pin 10 or Pin 14 can be reconfigured as an
SMBALERT output to signal out-of-limit conditions.
Table 28. CONFIGURING PIN 10 AS SMBALERT
OUTPUT
works only if the fan is already running, for example, in
manual mode when the current duty cycle is above 0x00, or
in automatic mode when the temperature is above T MIN .
If the temperature is below T MIN or if the duty cycle in
manual mode is set to 0x00, pulling the THERM low
externally has no effect. See Figure 32 for more information.
Register
Configuration Register 3
(Register 0x78), Bit 0
Bit Setting
[1] Pin 10 = SMBALERT
[0] Pin 10 = PWM2 (Default)
T MIN
Assigning THERM Functionality to a Pin
Pin 14 on the ADT7490 has three possible functions:
SMBALERT, THERM, and TACH4. The user chooses the
required functionality by setting Bit 0 and Bit 1 of
Configuration Register 4 at Address 0x7D.
If THERM is enabled (Bit 1, Configuration Register 3
at Address 0x78),
? Pin 22 becomes THERM.
? If Pin 14 is configured as THERM (Bit 0 and Bit 1 of
Configuration Register 4 at Address 0x7D), THERM is
enabled on this pin.
If THERM is not enabled,
THERM
THERM ASSERTED TO LOW AS
AN INPUT: FANS DO NOT GO
TO 100% BECAUSE TEMPERATURE THERM ASSERTED TO LOW AS
IS BELOW T MIN AN INPUT: FANS GO TO 100%
BECAUSE TEMPERATURE IS
ABOVE T MIN AND FANS ARE
ALREADY RUNNING.
Figure 32. Asserting THERM Low as an Input in
Automatic Fan Speed Control Mode
?
Pin 22 becomes a 2.5 V IN measurement input.
? If Pin 14 is configured as THERM, THERM is disabled
on this pin.
Table 29. CONFIGURING PIN 14 IN REGISTER 0x7D
THERM Timer
The ADT7490 has an internal timer to measure THERM
assertion time. For example, the THERM input can be
connected to the PROCHOT o utput of a CPU to measure
Bit 1
0
0
1
1
Bit 0
0
1
0
1
Function
TACH4
THERM
SMBALERT
Reserved
system performance. The THERM input can also
be connected to the output of a trip point temperature sensor.
The timer is started on the assertion of the ADT7490
THERM input and stopped when THERM is deasserted.
The timer counts THERM times cumulatively, that is, the
timer resumes counting on the next THERM assertion. The
THERM as an Input
When THERM is configured as an input, the user can time
assertions on the THERM pin. This can be useful for
connecting to the PROCHOT output of a CPU to gauge
system performance.
The user can also set up the ADT7490 so that the fans run
at 100% when the THERM pin is driven low externally. The
fans run at 100% for the duration of the time that the THERM
pin is pulled low. This is done by setting the BOOST bit
(Bit 2) in Configuration Register 3 (Address 0x78) to 1. This
THERM timer continues to accumulate THERM assertion
times until the timer is read (it is cleared on read), or until it
reaches full scale. If the counter reaches full scale, it stops
at that reading until cleared.
The 8-bit THERM timer status register (0x79) is designed
so that Bit 0 is set to 1 on the first THERM assertion. Once
the cumulative THERM assertion time has exceeded
45.52 ms, Bit 1 of the THERM timer is set and Bit 0 now
becomes the LSB of the timer with a resolution of 22.76 ms
(see Figure 33).
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