SE97BTP datasheet(11/53 Pages) NXP

Part #	SE97BTP

Description	DDR memory module temp sensor with integrated SPD

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Manufacturer	NXP [NXP Semiconductors]

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11 / 53 page

SE97B_1

Product data sheet

Rev. 01 — 27 January 2010

11 of 53

NXP Semiconductors

SE97B

DDR memory module temp sensor with integrated SPD

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 SE97B’s conversion rate is at least 8 Hz or 125 ms.

7.4.1 What temperature is read when conversion is in progress

The SE97B 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 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.

7.5 Power-up default condition

After power-on, the SE97B is initialized to the following default condition:

• Starts monitoring local sensor

• EVENT register is cleared; EVENT output is pulled HIGH by external pull-ups

• EVENT hysteresis is defaulted to 0 °C

• Command pointer is defaulted to ‘00h’

• Critical Temp, Alarm Temperature Upper and Lower Boundary Trip register are

defaulted to 0

°C

• Capability register is defaulted to ‘00F7h’ for the B-grade and VHV capability,

EVENT de-asserted and SMBus TIMEOUT between 25 ms and 35 ms enabled.

• Operational mode: comparator

• SMBus register is defaulted to ‘21h’

7.6 Device initialization

SE97B temperature sensors have programmable registers, which, upon power-up, default

to zero. The open-drain EVENT output is default to being disabled, comparator mode and

active LOW. The alarm trigger registers default to being unprotected. The configuration

registers, upper and lower alarm boundary registers and critical temperature window are

defaulted to zero and need to be programmed to the desired values. SMBus TIMEOUT

feature defaults to being enabled and can be programmed to disable. These registers are

required to be initialized before the device can properly function. Except for the SPD,

which does not have any programmable registers, and does not need to be initialized.

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