SE97B_1
?NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 27 January 2010
10 of 53
NXP Semiconductors
SE97B
DDR memory module temp sensor with integrated SPD
7.3.3 EVENT
operation modes
7.3.3.1 Comparator mode
In comparator mode, the EVENT
output behaves like a window-comparator output that
asserts when the temperature is outside the window (e.g., above the value programmed in
the Upper Boundary Alarm Trip register or below the value programmed in the Lower
Boundary Alarm Trip register or above the Critical Alarm Trip register if T
th(crit)
only is
selected). Reads/writes on these registers do not affect the EVENT
output in comparator
mode. The EVENT
signal remains asserted until the temperature goes inside the alarm
window or the window thresholds are reprogrammed so that the current temperature is
within the alarm window.
The comparator mode is useful for thermostat-type applications, such as turning on a
cooling fan or triggering a system shutdown when the temperature exceeds a safe
operating range.
7.3.3.2 Interrupt mode
In interrupt mode, EVENT
asserts whenever the temperature crosses an alarm window
threshold. After such an event occurs, writing a 1 to the clear event bit in the configuration
register de-asserts the EVENT
output until the next trigger condition occurs.
In interrupt mode, EVENT
asserts when the temperature crosses the alarm upper
boundary. If the EVENT
output is cleared and the temperature continues to increase until
it crosses the critical temperature threshold, EVENT
asserts again. Because the
temperature is greater than the critical temperature threshold, a clear event command
does not clear the EVENT
output. Once the temperature drops below the critical
temperature, EVENT
de-asserts immediately.
If the EVENT
output is not cleared before or when the temperature is in the critical
temperature threshold, EVENT
will remain asserted after the temperature drops below the
critical temperature until a clear event command.
7.3.3.3 Switching between Comparator mode and Interrupt mode
When the part is in Comparator mode and the temperature windows are set such that the
BAW bit is set and the EVENT
pin asserted (EventOutputControl = 1) and the part is
switched to Interrupt mode, the EVENT
is de-asserted.
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