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參數資料
| 型號： | SE95D,112 |
| 廠商： | NXP Semiconductors |
| 文件頁數： | 4/27頁 |
| 文件大小： | 150K |
| 描述： | IC SENSOR TEMP 2.8-5.5V SOT96-1 |
| 標準包裝： | 100 |
| 功能： | 溫度監視系統（傳感器），監視器 |
| 傳感器類型： | 內部 |
| 感應溫度： | -55°C ~ 125°C |
| 精確度： | ±3°C（最小值） |
| 拓撲： | ADC（三角積分型），比較器，振蕩器，寄存器庫 |
| 輸出類型： | 2 線串行，I²C? |
| 輸出警報： | 無 |
| 輸出風扇： | 是 |
| 電源電壓： | 2.8 V ~ 5.5 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 管件 |
| 其它名稱： | 935274141112 SE95D SE95D-ND |
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SE95_7
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 2 September 2009
4 of 27
NXP Semiconductors
SE95
Ultra high accuracy digital temperature sensor and thermal watchdog
7. Functional description
7.1 General operation
The SE95 uses the on-chip band gap sensor to measure the device temperature with a
resolution of 0.03125 癈 and stores the 13-bit twos complement digital data, resulting
from 13-bit analog to digital conversion, into register Temp. Register Temp can be read at
any time by a controller on the I
2
C-bus. Reading temperature data does not affect the
conversion in progress during the read operation.
The device can be set to operate in either mode: normal or shutdown mode. In normal
operation mode, by default, the temperature-to-digital conversion is executed every
100 ms and register Temp is updated at the end of each conversion. In shutdown mode,
the device becomes idle, data conversion is disabled and register Temp holds the latest
result; however, the device I
2
C-bus interface is still active and register write/read operation
can be performed. The device operation mode is controlled by programming bit
SHUTDOWN of register Conf. The temperature conversion is initiated when the device is
powered up or returned to normal mode from shutdown mode.
In addition, at the end of each conversion in normal mode, the temperature data (or Temp)
in register Temp is automatically compared with the overtemperature shutdown threshold
data (or Tos) stored in register Tos, and the hysteresis data (or Thyst) stored in register
Thyst, in order to set the state of the device OS output accordingly. The registers Tos and
Thyst are write/read capable, and both operate with 9-bit twos complement digital data.
To match with this 9-bit operation, register Temp uses only the 9 MSB bits of its 13-bit data
for the comparison.
The device temperature conversion rate is programmable and can be chosen to be one of
the four values: 0.125, 1.0, 10, and 30 conversions/s. The default conversion rate is
10 conversions/s. Furthermore, the conversion rate is selected by programming bits
RATEVAL[1:0] of register Conf as shown in
T
ab
le
6. Note that the average supply current
as well as the device power consumption increase with the conversion rate.
The way that the OS output responds to the comparison operation depends upon the OS
operation mode selected by conguration bit OS_COMP_INT, and the user-dened fault
queue dened by conguration bits OS_F_QUE[1:0].
In OS comparator mode, the OS output behaves like a thermostat. It becomes active
when the temperature exceeds T
os
, and is reset when the temperature drops below T
hyst
.
Reading the device registers or putting the device into shutdown mode does not change
the state of the OS output. The OS output in this case can be used to control cooling fans
or thermal switches.
A1
6
user-dened address bit 1 digital input
A0
7
user-dened address bit 0 digital input
V
CC
8
supply voltage
Table 2.
Pin description &continued
Symbol
Pin
Description
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