參數(shù)資料
型號(hào)： CAP1028-1-BP-TR
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, QCC20
封裝： 4 X 4 MM, ROHS COMPLAINT, QFN-20
文件頁(yè)數(shù)： 16/69頁(yè)
文件大?。?/td> 948K
代理商： CAP1028-1-BP-TR
8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
SMSC CAP1028
23
Revision 1.0 (06-16-09)
DATASHEET
3.6
Bi-Directional SPI Protocols
3.6.1
Reset Interface
Resets the Serial interface whenever two successive 7Ah codes are received. Regardless of the
current phase of the transaction - command or data, the receipt of the successive reset commands
resets the Serial communication interface only. All other functions are not affected by the reset
operation.
3.6.2
Set Address Pointer
Sets the address pointer to the register to be accessed by a read or write command. This command
overrides the auto-incrementing of the address pointer.
Figure 3.6 SPI Read Command - Normal Mode - Full
Figure 3.7 SPI Reset Interface Command - Bi-directional Mode
Master SPDOUT
SPI_MOSI
Master Drives
Slave Drives
SPI_CLK
Read Command – 7Fh
SPI_CS#
Data at previously set register address = current
address pointer
SPI_MISO
‘0’
‘1’
Data at previously set register address = current
address pointer (SPI)
XXh
1. Register Read Address
updated to Current SPI Read
Address pointer
1. Register data loaded into
output buffer = data at current
address pointer
1. Output buffer transmitted =
data at previous address
pointer + 1 = current address
pointer
1. Register Read Address
incremented = current address
pointer + 1
1. SPI Read Address
Incremented = new current
address pointer
2. Register Read Address
Incremented = current address
pointer +1
Register Data loaded into
Output buffer = data at current
address pointer + 1
1. Output buffer transmitted =
data at current address pointer
+ 1
2. Flag set to increment SPI
Read Address at end of next 8
clocks
‘0’
‘1’
Data at previously set register address = current
address pointer (SPI)
1. Register data loaded into
output buffer = data at current
address pointer
1. Output buffer transmitted =
data at previous register
address pointer + 1 = current
address pointer
1. Output buffer transmitted =
data at current address pointer
+ 1
2. Flag set to increment SPI
Read Address at end of next 8
clocks
Subsequent Read Commands – 7Fh
1. Register Read Address
updated to Current SPI Read
Address pointer.
2. Register Read Address
incremented = current address
pointer +1 – end result =
register address pointer doesn’t
change
Master SPDOUT
SPI_MSIO
SPI_CS#
SPI_CLK
Reset - 7Ah
‘1’
‘0’
‘1’
‘0’
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