SA56004GD datasheet(15/36 Pages) NXP

15 / 36 page

SA56004X_5

Product data sheet

Rev. 05 — 22 May 2008

15 of 36

NXP Semiconductors

SA56004X

Digital temperature sensor with overtemperature alarms

7.9.2 T_CRIT output

The T_CRIT output is LOW when any temperature reading is greater than the preset limit

in the corresponding critical temperature setpoint register. When one of the T_CRIT

setpoint temperatures is exceeded, the appropriate status register bit, 1 (RCRIT) or 0

(LCRIT), is set.

After every local and remote temperature conversion the status register ﬂags and the

T_CRIT output are updated. Figure 7 is a timing diagram showing the relationship of

T_CRIT output, Status bit 1 (RCRIT) and the remote critical temperature setpoint (RCS),

and critical temperature hysteresis (TH) with remote temperature changes. Note that the

T_CRIT output is de-activated only after the remote temperature is below the remote

temperature setpoint, RCS minus the hysteresis, TH. In the interrupt mode only, the

Status register ﬂags are reset after the Status register is read.

Event A: T_CRIT goes LOW and Status bit 1 (RCRIT) is set HIGH when Remote

Temperature exceeds RCS, Remote T_CRIT Setpoint.

Event B: Remote Temperature goes below RCS

− TH. T_CRIT is de-activated, but

Status register remains unchanged.

Table 16.

ALERT response bit assignment

ALERT response bit

Device address bit

Function

7 (MSB)

ADD6

address bit 6 (MSB) of alerted device

ADD5

address bit 5 of alerted device

ADD4

address bit 4 of alerted device

ADD3

address bit 3 of alerted device

ADD2

address bit 2 of alerted device

ADD1

address bit 1 of alerted device

ADD0

address bit 0 of alerted device

always logic 1

Fig 7.

T_CRIT temperature response timing

002aad217

RCS

− TH

Status register bit 1

(RCRIT)

remote temperature

T_CRIT output

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