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| 型號： | AT42QT1070-SSU |
| 廠商： | ATMEL CORP |
| 元件分類： | 速度傳感器和接近開關(guān) |
| 英文描述： | PROXIMITY SENSOR-CAPACITIVE, 0.6-2.6V, RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, MS-012AB, SOIC-14 |
| 文件頁數(shù)： | 7/38頁 |
| 文件大小： | 509K |
| 代理商： | AT42QT1070-SSU |
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15
9596A–AT42–10/10
AT42QT1070
4.
I2C-compatible Communications (Comms Mode Only)
4.1
I2C-compatible Protocol
4.1.1
Protocol
page 18) and supports multibyte reads and writes. The maximum clock rate is 400 kHz.
See Section A on page 31 for an overview of I
2C-compatible bus operation.
4.1.2
Signals
The I
2C-compatible interface requires two signals to operate:
SDA - Serial Data
SCL - Serial Clock
A third line, CHANGE, is used to signal when the device has seen a change in the status byte:
CHANGE: Open-drain, active low when any capacitive key has changed state since the last
I
pulled up with an external resistor. If the status bytes change back to their original state
before the host has read the status bytes (for example, a touch followed by a release), the
CHANGE line is held low. In this case, a read to any memory location clears the CHANGE
line.
4.2
I2C-compatible Address
There is one preset I2C-compatible address of 0x1B. This is not changeable.
4.3
Data Read/Write
4.3.1
Writing Data to the Device
The sequence of events required to write data to the device is shown next.
1.
The host initiates the transfer by sending the START condition
2.
The host follows this by sending the slave address of the device together with the
WRITE bit.
Table 4-1.
Description of Write Data Bits
Key
Description
S
START condition
SLA+W
Slave address plus write bit
A
Acknowledge bit
MemAddress
Target memory address within device
Data
Data to be written
P
Stop condition
SLA+W
MemAddress
AA
S
Data
A
P
Host to Device
Device to Host
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| AT42QT1085-MU | 功能描述:電容觸摸傳感器 8 Channel QTouch Haptic Sensor IC RoHS:否 制造商:Microchip Technology 電源電壓: 通道數(shù)量: 封裝 / 箱體: 尺寸: 溫度范圍: |
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