se98pw NXP Semiconductors, se98pw Datasheet - Page 6

• Manufacturer Part Number: se98pw
• Description: Se98 So-dimm Smbus/i2c-bus Temperature Sensor
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SE98_2
Product data sheet
Fig 5. EVENT output for ‘Interrupt’, ‘Comparator’, and ‘Critical Temp only’ modes
EVENT in ‘Critical Temp only’ mode
(1) EVENT pin shown here is active LOW. It can be programmed to be active HIGH.
EVENT in Comparator mode
EVENT in Interrupt mode
Upper Boundary Alarm
Lower Boundary Alarm
software interrupt clear
7.3.1 Alarm window
7.3.2 Critical trip
7.4 Conversion rate
alarm window
temperature ( C)
The alarm window consists of two registers: an Upper Boundary Alarm Trip register (02h),
and a Lower Boundary Alarm Trip register (03h). The Upper Boundary Alarm Trip register
holds the upper temperature trip point, while the Lower Boundary Alarm Trip register holds
the lower temperature trip point. When the EVENT control is enabled, the EVENT output
will be triggered whenever entering or exiting the alarm window.
The device can be programmed in such a way that the EVENT output is triggered when
the temperature exceeds the critical trip point set by the Critical Alarm Trip register (04h).
When the temperature sensor reaches the critical temperature value, the device is
automatically placed in comparator mode; the EVENT output is only cleared when the
temperature falls below the critical temperature value and cannot be cleared through the
clear EVENT bit or SMBus Alert.
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 SE98’s conversion rate is at least 8 Hz or 125 ms.
critical
(1)
(1)
(1)
software clears event
Rev. 02 — 7 January 2008
SO-DIMM SMBus/I
hysteresis
2
C-bus temperature sensor
© NXP B.V. 2008. All rights reserved.
002aab233
SE98
time
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