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參數(shù)資料
| 型號： | CAP1028-1-BP-TR |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLAINT, QFN-20 |
| 文件頁數(shù)： | 6/69頁 |
| 文件大?。?/td> | 948K |
| 代理商： | CAP1028-1-BP-TR |
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8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Revision 1.0 (06-16-09)
14
SMSC CAP1028
DATASHEET
Chapter 3 Communications
3.1
Communications
The CAP1028 communicates using the 2-wire SMBus or I2C bus, the 2-wire proprietary BC-Link, or
the SPI bus. Regardless of communication mechanism, the device functionality remains unchanged.
The communications mechanism as well as the SMBus (or I2C) slave address is determined by the
resistor connected between the ADDR_COMM pin and ground as shown in Table 3.1.
.
3.1.1
SMBus (I2C) Communications
When configured to communicate via the SMBus, the CAP1028 supports the following protocols: Send
Byte, Receive Byte, Read Byte, and Write Byte. In addition, the device supports I2C formatting for block
read and block write protocols. The SPI_CS# pin is not used and any data presented to this pin will
be ignored.
See Section 3.2 and Section 3.3 for more information on the SMBus bus and protocols respectively.
3.1.2
SPI Communications
When configured to communicate via the SPI bus, the CAP1028 supports both bi-directional 3-wire
and normal 4-wire protocols and uses the SPI_CS# pin to enable communications.
See Section 3.4 and Section 3.6 for more information on the SPI bus and protocols respectively.
3.1.3
BC-Link Communications
When BC-Link communications are used, the CAP1028 supports the read byte protocol and the write
byte protocol.
See Section 3.7 for more information on the BC-Link Bus and protocols respectively.
APPLICATION NOTE: Upon power up, the CAP1028 will not respond to any communications for up to 15ms. After
this time, full functionality is available.
Table 3.1 ADDR_COMM Pin Decode
PULL-DOWN RESISTOR
PROTOCOL USED
SMBUS ADDRESS
<= 47k
SPI Communications using
Normal 4-wire Protocol Used
n/a
56k
SPI Communications using Bi-
Directional 3-wire Protocol Used
n/a
68k
BC-Link Communications
n/a
82k
SMBus / I2C
0101_100(r/w)
100k
SMBus / I2C
0101_011(r/w)
120k
SMBus / I2C
0101_010(r/w)
150k
SMBus / I2C
0101_001(r/w)
VDD
SMBus / I2C
0101_000(r/w)
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