SE97BTP,547【PDF 10/53 页】IC TEMP SENSOR DIMM 8HWSON

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SE97B_1

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

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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