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参数资料
| 型号： | STMPE801MTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 6/26页 |
| 文件大小： | 399K |
| 代理商： | STMPE801MTR |
Turning I2C block OFF and ON
STMPE801
14/26
5.11
General call
A general call address is a transaction with the slave address of 0x00 and R/W = 0. When a
general call address is made, the device responds to this transaction with an
acknowledgement and behaves as a slave-receiver mode. The meaning of a general call
address is defined in the second byte sent by the master-transmitter.
Note:
All other second byte value will be ignored.
6
Turning I2C block OFF and ON
STMPE801 operates entirely on the I2C clock. When there are no activity on the I2C bus,
current consumption of the device is extremely low. However, when there are activity on the
I2C bus, current consumption increases, even if the I2C traffic is not directed to the assigned
address.
Host system may choose to shut-down the I2C block in the STMPE801, if no access to the
registers are required. This feature allows the current consumption to drop to the minimum.
Host system turns OFF the I2C block by writing ‘1’ into the I2C_SHDN bit. The I2C block will
shut down on the next valid clock edge of the I2C clock signal. In this state, the device
CANNOT be accessed by I2C, as the I2C has shut down completely.
To turn ON the I2C block, system host must reset the STMPE801 in order to re-activate the
I2C block. This could be done by hardware assertion of the RESET pin.
Table 9. General call
R/W
Second Byte Value
Definition
0
0x06
2-byte transaction in which the second byte tells the slave device
to reset and write (or latch in) the 1-bit programmable part of the
slave address.
0
0x04
2-byte transaction in which the second byte tells the slave device
not to reset and write (or latch in) the 1-bit programmable part of
the slave address.
0
0x00
Not allowed as second byte.
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相关代理商/技术参数 |
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| STMPE801QTR | 功能描述:接口-I/O扩展器 8B port expander Xpander logic RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| STMPE811 | 制造商:STMicroelectronics 功能描述:Controller with 8-bit GPIO expander |
| STMPE811_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-bit port expander with advanced touchscreen controller |
| STMPE811_09 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Advanced resistive touch screen controller with 8-bit GPIO expander |
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