SE97BTP datasheet(34/53 Pages) NXP

34 / 53 page

SE97B_1

Product data sheet

Rev. 01 — 27 January 2010

34 of 53

NXP Semiconductors

SE97B

DDR memory module temp sensor with integrated SPD

[1]

When the part comes out of shutdown, the state of the EVENT pin will not change until after the first

temperature conversion. When the part enters shutdown, the ACT (TEMP[15]), AAW (TEMP[14]) and BAW

(TEMP[13]) bits (flip-flops) will be cleared.

[2]

The STTS424E02 allows clearing the interrupt when in comparator mode, but the other competitors do not.

[1]

SMBus Time-out.

0 — enabled (default)

1 — disabled

[2]

Shutdown time-out.

0 — SMBus Time-out disabled when SHMD = 1

1 — SMBus Time-out enabled when SHMD = 1 (default)

[3]

Thermal Sensor Shutdown mode.

0 — active (default)

1 — shutdown

RFU

reserved; always ‘0’

DisableARA

Disable SMBus Alert Response Address (ARA).

0 — SMBus ARA is enabled

1 — disable SMBus ARA (default)

When either of the Critical Trip or Alarm Window lock bits is set, this bit

cannot be altered until unlocked.

Table 27.

SMBus Time-out register bit description …continued

Bit

Symbol

Description

Table 28.

SMBus register setting guide

Disable

Timeout[1]

Enable

SDTO[2]

SHMD

[3]

Thermal sensor

behavior

SPD behavior

Power mode

Use

TS is active and

SMBus TO is on

SPD read/write and

SMBus TO is on

Full power,

oscillator is running

JEDEC - SMBus for

TS and SPD

(like SE97 if TS is on)

TS is active and

SMBus TO is off

SPD read/write and

SMBus TO is off

Full power,

oscillator is running

I2C-bus - no SMBus

TS is disabled and

SMBus TO is on

SPD read/write and

SMBus TO is on

Lower power,

oscillator is off unless

bus active or write to

SPD

JEDEC - SMBus for

TS and SPD

TS is disabled and

SMBus TO is off

SPD low power

read/write and

SMBus TO is off

Lower power,

oscillator is off unless

write to the SPD

I2C-bus - no SMBus

TS is disabled and

SMBus TO is off

SPD low power

read-only and

SMBus TO is off

Lowest power,

oscillator is off all

the time

I2C-bus - no SMBus

TO (like SE97 if TS is

off)

SE97BTP Datasheet(PDF) 34 Page - NXP Semiconductors

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