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參數(shù)資料
| 型號： | ADT7408CCPZ2-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 3 X 3 MM, MO-229VEED-4, LFCSP-8 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大小： | 570K |
| 代理商： | ADT7408CCPZ2-REEL |
ADT7408
Preliminary Technical Data
Rev. PrC | Page 14 of 22
Event Pin Functionality
Figure 6 shows the 3 differently-defined outputs of Event#
correspondent to the temperature change. Event# can be
programmed to be one of the three output modes in the
Configuration Register.
If in Interrupt Mode and the temperature reaches the critical
temperature, the device switches to the comparator mode
automatically and asserts the Event# output. When the
temperature drops below the critical temperature, the part
switches back to either Interrupt, or Comparator mode, as
programmed in the Configuration Register. Note that Figure 6
is drawn with no hysteresis, but the values programmed into
register 0x01 bits 10:9 affect the operation of the event trigger
points. See Figure 5 and Table 12 for the explanation of
hysteresis functionality.
Event Thresholds
All event thresholds use hysteresis as programmed in register
0x01 bits 10:9 to set when they de-assert.
Alarm Window Trip
The device provides a comparison window with an upper
temperature trip point in the Alarm Upper Boundary Register,
and a lower trip point in the Alarm Lower Boundary Register.
When enabled, the Event# output will be triggered whenever
entering, or exiting (crossing above or below) the Alarm
Window.
Critical Trip
The device can be programmed in such a way that the Event
output is only triggered when the temperature exceeds critical
trip point. The Critical temperature setting is programmed in
Critical Temperature Register. When the temperature sensor
reaches the critical temperature value in this register, the device
is automatically placed in comparator mode meaning that the
Critical Event output cannot be cleared through software setting
the “Clear Event” bit.
Interrupt Mode
After an Event occurs, Software may write a one (‘1’) to the
“Clear Event” bit in the Configuration Register to de-assert the
Event# Interrupt output, until the next trigger condition occurs.
Comparator Mode
Reads/writes on the device registers will not affect the Event#
output in comparator mode. The Event# signal will remain
asserted until the temperature drops outside the range, or the
range is re-programmed such that the current temperature is
outside the range.
Note: Event# cannot be cleared once the DUT temperature is greater than the Critical temperature.
Figure 6. Temperature, Trip, and Events
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