参数资料
型号: MCP23008-E/ML
厂商: Microchip Technology
文件页数: 42/44页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 20QFN
标准包装: 91
接口: I²C
输入/输出数: 8
中断输出:
频率 - 时钟: 1.7MHz
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-VFQFN 裸露焊盘
供应商设备封装: 20-QFN 裸露焊盘(4x4)
包装: 托盘
包括: POR
产品目录页面: 684 (CN2011-ZH PDF)
配用: GPIODM-KPLCD-ND - BOARD DEMO LCD GPIO EXP KEYPAD
2007 Microchip Technology Inc.
DS21919E-page 7
MCP23008/MCP23S08
FIGURE 1-1:
MCP23008 I2C DEVICE PROTOCOL
1.3.3.3
SPI Sequential Write/Read
For sequential operations, instead of deselecting the
device by raising CS, the master clocks the next byte
pointed to by the address pointer.
The sequence ends by the raising of CS.
The MCP23S08 address pointer will roll over to
address zero after reaching the last register address.
1.4
Hardware Address Decoder
The hardware address pins are used to determine the
device address. To address a device, the correspond-
ing address bits in the control byte must match the pin
state.
MCP23008 has address pins A2, A1 and A0.
MCP23S08 has address pins A1 and A0.
The pins must be biased externally.
S
P
SR
w
R
OP
ADDR
DOUT
DIN
- START
- RESTART
- STOP
- Write
- Read
- Device opcode
- Device address
- Data out from MCP23008
- Data into MCP23008
S
P
SR
W
R
OP
ADDR
DIN
....
S
P
W
R
OP
ADDR
DOUT
....
P
SR
W
OP
DIN
....
P
SR
R
DOUT
....
P
OP
DOUT
....
P
SR
OP
DIN
....
P
OP
DIN
S
P
W
OP
ADDR
DIN
....
Byte and Sequential Write
S
W
OP
SR
R
OP
DOUT
....
P
Byte and Sequential Read
S
W
OP
ADDR
DIN
P
S
W
OP
SR
R
OP
DOUT
P
Byte
Sequential
Byte
Sequential
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