SE98A datasheet(10/43 Pages) NXP

Part #	SE98A

Description	DDR memory module temp sensor, 1.7 V to 3.6 V

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Manufacturer	NXP [NXP Semiconductors]

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10 / 43 page

SE98A_4

Product data sheet

Rev. 04 — 25 November 2009

10 of 43

NXP Semiconductors

SE98A

DDR memory module temp sensor, 1.7 V to 3.6 V

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.

• Advisory notification:

– NXP device: If the EVENT output is not cleared before the temperature goes

above the critical temperature threshold EVENT de-asserts immediately when

temperature drops below the critical temperature.

– Competitor devices: 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.

– Work-around: Always clear the EVENT output before temperature exceeds the

critical temperature.

– SE98B will keep EVENT asserted after the temperature drops below the critical

temperature until a Clear EVENT command de-asserts EVENT.

7.4 Conversion rate

The conversion time is the amount of time required for the ADC to complete a

temperature measurement for the local temperature sensor. The conversion rate is the

inverse of the conversion period which describes the number of cycles the temperature

measurement completes in one second—the faster the conversion rate, the faster the

temperature reading is updated. The SE98A’s conversion rate is at least 8 Hz or 125 ms.

7.4.1 What temperature is read when conversion is in progress

The SE98A has been designed to ensure a valid temperature is always available. When a

read to the temperature register is initiated through the SMBus, the device checks to see if

the temperature conversion process (Analog-to-Digital conversion) is complete and a new

temperature is available:

• If the temperature conversion process is complete, then the new temperature value is

sent out on the SMBus.

• If the temperature conversion process in not complete, then the previous temperature

value is sent out on the SMBus.

It is possible that while the SMBus Master is reading the temperature register, a new

temperature conversion completes. However, this will not affect the data (MSB or LSB)

that is being shifted out. On the next read of the temperature register the new temperature

value will be shifted out.

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