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AN1043
HARDWARE ADDRESS PINS
Address pins are typically used on I 2 C devices to allow
multiple devices with the same base slave address to
operate on the bus.
Slave devices with SPI interfaces typically use only a
chip select pin to select the device. This requirement
consumes one MCU pin for every SPI device on the
bus.
The “S” devices (MCP23S08 and MCP23S17) have
SPI interfaces. These devices use a chip select for
selecting the part, however, these parts also have hard-
ware address pins, thereby giving the advantage of
attaching multiple devices on the bus while only
consuming one MCU pin for chip select (see Figure 9).
FIGURE 9:
ADDRESS PINS ON SPI DEVICES
MCP23S17
MCP23S08
A1
A0
A2
A1
A0
CS
SCK
SDI
SDO
SPI
Addr
Pins
GPIO
Port
GP15
.
.
.
.
.
.
.
GP0
MCP23S08
GP7
.
.
.
GP0
A2 A1 A0
S 0 1 0 0 1 0 0 0 A 0 0 0 0 1 0 1 0 A
MCP23X17
Opcode
SUMMARY
The MCP23X08/17 family of GPIO Expanders have
some unique features, giving the system and module
engineer maximum flexibility when designing with the
MCP23X08/17.
DS01043A-page 8
Register Addr
? 2006 Microchip Technology Inc.
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