LM75A_4
?NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 04 10 July 2007
11 of 24
NXP Semiconductors
LM75A
Digital temperature sensor and thermal watchdog
When the power supply voltage is dropped below the device power-on reset level of
approximately 1.9 V (POR) and then rises up again, the device will be reset to its default
condition as listed above.
7.10 Protocols for writing and reading the registers
The communication between the host and the LM75A must strictly follow the rules as
dened by the I
2
C-bus management. The protocols for LM75A register read/write
operations are illustrated in
Figure
5 to
Figure
10 together with the following denitions:
1. Before a communication, the I
2
C-bus must be free or not busy. It means that the SCL
and SDA lines must both be released by all devices on the bus, and they become
HIGH by the bus pull-up resistors.
2. The host must provide SCL clock pulses necessary for the communication. Data is
transferred in a sequence of 9 SCL clock pulses for every 8-bit data byte followed by
1-bit status of the acknowledgement.
3. During data transfer, except the START and STOP signals, the SDA signal must be
stable while the SCL signal is HIGH. It means that the SDA signal can be changed
only during the LOW duration of the SCL line.
4. S: START signal, initiated by the host to start a communication, the SDA goes from
HIGH to LOW while the SCL is HIGH.
5. RS: RE-START signal, same as the START signal, to start a read command that
follows a write command.
6. P: STOP signal, generated by the host to stop a communication, the SDA goes from
LOW to HIGH while the SCL is HIGH. The bus becomes free thereafter.
7. W: write bit, when the write/read bit = LOW in a write command.
8. R: read bit, when the write/read bit = HIGH in a read command.
9. A: device acknowledge bit, returned by the LM75A. It is LOW if the device works
properly and HIGH if not. The host must release the SDA line during this period in
order to give the device the control on the SDA line.
10. A: master acknowledge bit, not returned by the device, but set by the master or host
in reading 2-byte data. During this clock period, the host must set the SDA line to
LOW in order to notify the device that the rst byte has been read for the device to
provide the second byte onto the bus.
11. NA: Not Acknowledge bit. During this clock period, both the device and host release
the SDA line at the end of a data transfer, the host is then enabled to generate the
STOP signal.
12. In a write protocol, data is sent from the host to the device and the host controls the
SDA line, except during the clock period when the device sends the device
acknowledgement signal to the bus.
13. In a read protocol, data is sent to the bus by the device and the host must release the
SDA line during the time that the device is providing data onto the bus and controlling
the SDA line, except during the clock period when the master sends the master
acknowledgement signal to the bus.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
LM75BD,112
IC TEMP SENSOR DIGITAL 8-SOIC
LM75BIMX-5+
IC TEMP SENSOR WATCHDOG 8SOIC
LM92CIMX/NOPB
IC SENSOR TEMP/THERM COMP 8-SOIC
LT1123CST#TRPBF
IC REG CTRLR SGL 5V SOT223
LT1248IS#PBF
IC PFC CTRLR AVERAGE CURR 16SOIC
LT1249IS8#PBF
IC PFC CTRLR AVERAGE CURR 8SOIC
LT1577CS-3.3/2.8#TRPBF
IC REG CTRLR DUAL OUT 16SOIC
LT1640HIN8#PBF
IC CONTRLR HOTSWAP NEGVOLT 8-DIP
相关代理商/技术参数
LM75AD,118
功能描述:板上安装温度传感器 I2C LOCAL +/- 2OC TS RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
LM75AD.112
制造商:PHILIPS 制造商全称: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 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6
LM75AD112
制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述:
LM75ADP
制造商:NXP Semiconductors 功能描述:Digital Temp Sensor 2-Wire,LM75ADP
LM75ADP,118
功能描述:板上安装温度传感器 TEMP SENSOR DIGITAL RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能: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