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參數(shù)資料
| 型號： | LM75A |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Digital temperature sensor and thermal Watchdog |
| 中文描述： | 數(shù)字溫度傳感器和熱看門狗 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 126K |
| 代理商： | LM75A |
Philips Semiconductors
Product data sheet
LM75A
Digital temperature sensor and thermal Watchdog
2004 Oct 05
8
I
2
C serial interface
The LM75A can be connected to a compatible 2-wire serial interface
I
2
C-bus as a slave device under the control of a controller or master
device, using two device terminals, SCL and SDA. The controller
must provide the SCL clock signal and write/read data to/from the
device through the SDA terminal. Notice that if the I
2
C common
pull-up resistors have not been installed as required for I
2
C-bus,
then an external pull-up resistor, about 10 k
, is needed for each of
these two terminals. The bus communication protocols are
described in the data communication section.
Slave address
The LM75A slave address on the I
2
C-bus is partially defined by the
logic applied to the device address pins A2, A1 and A0. Each of
them is typically connected either to GND for logic 0, or to V
CC
for
logic 1. These pins represent the three LSB bits of the device 7-bit
address. The other four MSB bits of the address data are preset to
‘1001’ by hard wiring inside the LM75A. Table 1 shows the device’s
complete address and indicates that up to 8 devices can be
connected to the same bus without address conflict. Because the
input pins, SCL, SDA, A2–A0, are not internally biased, it is
important that they should not be left floating in any application.
Table 1. Address table
1 = HIGH, 0 = LOW
MSB
LSB
1
0
0
1
A2
A1
A0
Register list
The LM75A contains four data registers beside the pointer register
as listed in Table 2. The pointer value, read/write capability and
default content at power up of the registers are also shown in the
Register table.
Table 2. Register table
Register name
Pointer value
R/W
POR state
Description
Conf
01H
R/W
00H
Configuration Register
.
Contains a single 8-bit data byte. To set the device operating condition.
Default = 0.
Temp
00H
Read only
N/A
Temperature Register
.
Contains two 8-bit data bytes. To store the measured Temp data.
Tos
03H
R/W
50 00H
Over-temp Shutdown threshold Register
.
Contains two 8-bit data bytes. To store the over-temp shut-down Tos limit.
Default = 80
°
C.
Thyst
02H
R/W
4B 00H
Hysteresis Register
.
Contains two 8-bit data bytes. To store the hysteresis Thyst limit.
Default = 75
°
C.
Pointer register
The pointer register contains an 8-bit data byte of which the two
LSB bits represent the pointer value of the other four registers, and
the other 6 MSB bits are equal to 0, as shown in the Pointer register
table (Table 3) and the Pointer value table (Table 4). The pointer
register is not accessible to the user, but is used to select the data
register for write/read operation by including the pointer data byte in
the bus command.
Table 3. Pointer register table
B7
B6
B5
B4
B3
B2
B1
B0
0
0
0
0
0
0
Pointer value
Table 4. Pointer value
B1
B0
Selected register
0
0
Temperature register (Temp)
0
1
Configuration register (Conf)
1
0
Hysteresis register (Thyst)
1
1
Overtemp shut-down register (Tos)
Because the Pointer value is latched into the Pointer register when
the bus command, which includes the pointer byte, is executed, a
read from the LM75A may or may not include the pointer byte in the
statement. To read again a register, which has been recently read
and the pointer has been preset, the pointer byte does not have to
be included. To read a register, which is different with the one that
has been recently read, the pointer byte must be included. However,
a write to the LM75A must always include the pointer byte in the
statement. The bus communication protocols are described in detail
in the data communication section.
At power-up, the Pointer value is equal to 0 and the Temp register is
selected; users can then read the Temp data without specifying the
pointer byte.
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|---|---|
| LM75AD | 制造商:NXP Semiconductors 功能描述: |
| LM75AD,112 | 功能描述:板上安裝溫度傳感器 I2C LOCAL +/- 2OC TS RoHS:否 制造商:Omron Electronics 輸出類型: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 |
| LM75AD,118 | 功能描述:板上安裝溫度傳感器 I2C LOCAL +/- 2OC TS RoHS:否 制造商:Omron Electronics 輸出類型: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 |
| LM75AD.112 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital temperature sensor and thermal watchdog |
| LM75AD/G-T | 功能描述:IC I2C TEMP SNSR/WATCHDOG 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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