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参数资料
| 型号： | LMP91000SDE |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封装： | LLP-14 |
| 文件页数： | 5/24页 |
| 文件大小： | 696K |
| 代理商： | LMP91000SDE |
WRITE AND READ OPERATION
In order to start any read or write operation with the
LMP91000, MENB needs to be set low during the whole com-
munication. Then the master generates a start condition by
driving SDA from high to low while SCL is high. The start con-
dition is always followed by a 7-bit slave address and a Read/
Write bit. After these 8 bits have been transmitted by the mas-
ter, SDA is released by the master and the LMP91000 either
ACKs or NACKs the address. If the slave address matches,
the LMP91000 ACKs the master. If the address doesn't
match, the LMP91000 NACKs the master. For a write opera-
tion, the master follows the ACK by sending the 8-bit register
address pointer. Then the LMP91000 ACKs the transfer by
driving SDA low. Next, the master sends the 8-bit data to the
LMP91000. Then the LMP91000 ACKs the transfer by driving
SDA low. At this point the master should generate a stop con-
dition and optionally set the MENB at logic high level (refer
to Figure 3).
A read operation requires the LMP91000 address pointer to
be set first, also in this case the master needs setting at low
logic level the MENB, then the master needs to write to the
device and set the address pointer before reading from the
desired register. This type of read requires a start, the slave
address, a write bit, the address pointer, a Repeated Start (if
appropriate), the slave address, and a read bit (refer to
Figure 3). Following this sequence, the LMP91000 sends out
the 8-bit data of the register.
When just one LMP91000 is present on the I2C bus the MENB
can be tied to ground (low logic level).
30132572
(a) Register write transaction
30132571
(b) Pointer set transaction
30132570
(c) Register read transaction
FIGURE 3. READ and WRITE transaction
13
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LMP91000
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMP91000SDE/NOPB | 功能描述:空气质量传感器 RoHS:否 制造商:GE M&C / Telaire 类型:CO2 Module 检测灵敏度: 工作电源电压:5 V 最大工作温度:+ 50 C 最小工作温度:0 C |
| LMP91000SDEVAL | 制造商:Texas Instruments 功能描述: |
| LMP91000SDEVAL/NOPB | 功能描述:多功能传感器开发工具 GAS SENSOR AFE EVAL BOARDLMP91 RoHS:否 制造商:Texas Instruments 工具用于评估:LMP91200 接口类型:SPI 工作电压:1.8 V to 5.5 V 最大工作温度: |
| LMP91000SDX | 制造商:TI 制造商全称:Texas Instruments 功能描述:Sensor AFE System: Configurable AFE Potentiostat for Low-Power Chemical Sensing Applications |
| LMP91000SDX/NOPB | 功能描述:空气质量传感器 RoHS:否 制造商:GE M&C / Telaire 类型:CO2 Module 检测灵敏度: 工作电源电压:5 V 最大工作温度:+ 50 C 最小工作温度:0 C |
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