MCP23018 查看數據表（PDF） - Microchip Technology

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MCP23018

16-Bit I/O Expander with Open-Drain Outputs

Microchip Technology 

MCP23018/MCP23S18

FIGURE 1-5:

HARDWARE ADDRESS DECODE TIMING

VDD

tADEN

adc_en

tADDRLAT

i2c_addr[2:0]

i2c_clk

tADDIS

1.4.2

ADDRESSING I2C DEVICES

(MCP23018)

The MCP23018 is a slave I2C device that supports 7-

bit slave addressing, with the read/write bit filling out

the control byte. The slave address contains four fixed

bits and three user-defined hardware address bits (pins

A2, A1, and A0). Figure 1-6 shows the control byte

format.

1.4.3

ADDRESSING SPI DEVICES

(MCP23S18)

The MCP23S18 is a slave SPI device. The slave

address contains seven fixed bits(no address bits) with

the read/write bit filling out the control byte. Figure 1-7

shows the control byte format.

FIGURE 1-6:

I2C™ CONTROL BYTE

FORMAT

Control Byte

S 0 1 0 0 A2 A1 A0 R/W ACK

Slave Address

Start

bit

R/W = 0 = write

R/W = 1 = read

R/W bit

ACK bit

FIGURE 1-7:

SPI CONTROL BYTE

FORMAT

CS

Control Byte

0 1 0 0 0 0 0 R/W

Slave Address

R/W bit

R/W = 0 = write

R/W = 1 = read

© 2008 Microchip Technology Inc.

DS22103A-page 13

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