參數(shù)資料
型號(hào)： LM75ADP
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 工業(yè)控制
英文描述： Digital temperature sensor and thermal watchdog
封裝： LM75AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 17, 2005,;LM75AD<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 17, 2005,;LM
文件頁(yè)數(shù)： 4/24頁(yè)
文件大?。?/td> 137K
代理商： LM75ADP
LM75A_4
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 04 — 10 July 2007
4 of 24
NXP Semiconductors
LM75A
Digital temperature sensor and thermal watchdog
7.
Functional description
7.1 General operation
The LM75A uses the on-chip band gap sensor to measure the device temperature with
the resolution of 0.125
°
C and stores the 11-bit 2's complement digital data, resulted from
11-bit A-to-D conversion, into the device Temp register. This Temp register 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. In normal operation
mode, the temp-to-digital conversion is executed every 100 ms and the Temp register is
updated at the end of each conversion. In shutdown mode, the device becomes idle, data
conversion is disabled and the Temp register 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 controllable by programming bit B0 of the configuration register.
The temperature conversion is initiated when the device is powered-up or put back into
normal mode from shutdown.
In addition, at the end of each conversion in normal mode, the temperature data (or Temp)
in the Temp register is automatically compared with the overtemperature shutdown
threshold data (or Tos) stored in the Tos register, and the hysteresis data (or Thyst) stored
in the Thyst register, in order to set the state of the device OS output accordingly. The
device Tos and Thyst registers are write/read capable, and both operate with 9-bit
2's complement digital data. To match with this 9-bit operation, the Temp register uses
only the 9 MSB bits of its 11-bit data for the comparison.
The way that the OS output responds to the comparison operation depends upon the OS
operation mode selected by configuration bit B1, and the user-defined fault queue defined
by configuration bits B3 and B4.
In OS comparator mode, the OS output behaves like a thermostat. It becomes active
when the Temp exceeds the T
os
, and is reset when the Temp drops below the T
hyst
.
Reading the device registers or putting the device into shutdown 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.
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 the Temp exceeds the T
os
; then it
remains active indefinitely until being reset by a read of any register. Once the OS output
has been activated by crossing T
os
and then reset, it can be activated again only when the
Temp drops below the T
hyst
; then again, it remains active indefinitely until being reset by a
read of any register. The OS interrupt operation would be continued in this sequence:
T
os
trip, Reset, T
hyst
trip, Reset, T
os
trip, Reset, T
hyst
trip, Reset, etc.
A1
A0
V
CC
6
7
8
Digital input. User-defined address bit 1.
Digital input. User-defined address bit 0.
Power supply.
Table 3.
Symbol
Pin description
…continued
Pin
Description
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM75ADP,118 功能描述:板上安裝溫度傳感器 TEMP SENSOR DIGITAL RoHS:否 制造商:Omron Electronics 輸出類(lèi)型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
LM75ADP,118 制造商:NXP Semiconductors 功能描述:IC, TEMP SENSOR, 0.125C, 3C, TSSOP-8
LM75ADP,118-CUT TAPE 制造商:NXP 功能描述:LM75A Series SMD 5.5 mA Digital Temperature Sensor w/ Thermal Watchdog TSSOP-8
LM75ADP/DG,118 功能描述:板上安裝溫度傳感器 DIGITAL TEMP SENSOR AND THERMAL WATCHDOG RoHS:否 制造商:Omron Electronics 輸出類(lèi)型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
LM75ADP118 制造商:NXP Semiconductors 功能描述:IC TEMP SENSOR 0.125 3 TSSOP-8 制造商:NXP Semiconductors 功能描述:IC TEMP SENSOR 0.125DEG 3DE
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