SA56004X Datasheet, PDF (15/36 Pages) NXP Semiconductors – 1 Degrees Celcious accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms

NXP Semiconductors
SA56004X
Digital temperature sensor with overtemperature alarms
Table 16. ALERT response bit assignment
ALERT response bit
Device address bit
7 (MSB)
ADD6
6
ADD5
5
ADD4
4
ADD3
3
ADD2
2
ADD1
1
ADD0
0
1
Function
address bit 6 (MSB) of alerted device
address bit 5 of alerted device
address bit 4 of alerted device
address bit 3 of alerted device
address bit 2 of alerted device
address bit 1 of alerted device
address bit 0 of alerted device
always logic 1
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.
RCS
RCS − TH
Status register bit 1
(RCRIT)
remote temperature
SA56004X_5
Product data sheet
T_CRIT output
A
BC
002aad217
Fig 7. T_CRIT temperature response timing
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.
Rev. 05 — 22 May 2008
© NXP B.V. 2008. All rights reserved.
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