MCP23009 Microchip Technology Inc., MCP23009 Datasheet - Page 13

• Manufacturer Part Number: MCP23009
• Description: 8-bit I/o Expander With Open-drain Outputs
• Manufacturer: Microchip Technology Inc.

FIGURE 1-8:
FIGURE 1-9:
© 2008 Microchip Technology Inc.
CS
S
0
0
1
1
Device Opcode
Device Opcode
0
0
I
SPI ADDRESSING REGISTERS
2
C™ ADDRESSING REGISTERS
0
0
A2 A1 A0
0
The ACKs are provided by the MCP23009.
0
0
R/W = 0
R/W
0
ACK
A7
A6
A7
MCP23009/MCP23S09
A5
A6
Register Address
A4
A5
Register Address
A3
A4
A2
A3
A1
A2
A0
A1
DS22121A-page 13
A0
ACK