se95u NXP Semiconductors, se95u Datasheet - Page 5

• Manufacturer Part Number: se95u
• Description: Ultra High Accuracy Digital Temperature Sensor And Thermal Watchdoge
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SE95_5
Product data sheet
In OS interrupt mode, the OS output is used for thermal interruption. When the device is
powered-up, the OS output is first activated only when T
active indefinitely until being reset by a read of any register. Once the OS output has been
activated by crossing T
below T
register. The OS interrupt operation would be continued in this sequence: T
T
mode also resets the OS output.
In both cases, comparator mode and interrupt mode, the OS output is activated only if a
number of consecutive faults, defined by the device fault queue, has been met. The fault
queue is programmable and stored in bits OS_F_QUE[1:0], of register Conf. Also, the OS
output active state is selectable as HIGH or LOW by setting accordingly the bit OS_POL
of register Conf.
At power-up, the device is put into normal operation mode, register Tos is set to 80 C,
register Thyst is set to 75 C, OS active state is selected LOW and the fault queue is equal
to 1. The data reading of register Temp is not available until the first conversion is
completed in about 33 ms.
The OS response to the temperature is illustrated in
Fig 4. OS response to temperature
hyst
(1) OS is reset by either reading register or putting the device in shutdown mode. Assumed that
trip, reset, T
hyst
OS ACTIVE
OS ACTIVE
OS RESET
OS RESET
the fault queue is met at each T
; then again, it remains active indefinitely until being reset by a read of any
T
T
hyst
Ultra high accuracy digital temperature sensor and thermal watchdog
os
os
trip, reset, T
Rev. 05 — 13 December 2007
os
and then reset, it can be activated again only when T
hyst
os
(1)
trip, reset, and etc. Putting the device into shutdown
and T
OS output in comparator mode
OS output in interrupt mode
reading temperature limits
hyst
crossing point.
Figure
(1)
emp
4.
exceeds T
os
© NXP B.V. 2007. All rights reserved.
; then it remains
001aad623
os
trip, reset,
SE95
emp
(1)
drops
5 of 24