SA56004HD,118【PDF 17/43 页】IC TEMP SENSOR DIGITAL 8SOIC

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Sheet目录46

13页 14页 15页 16页 [17页]18页 19页 20页 21页

SA56004X

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 7 25 February 2013

17 of 43

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 17. 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

2 217

RCS

RCS TH

tatus register bit 1

(RCRIT)

B C

remote temperature

T_CRIT output

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