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MCP23S17T-E/SP Datasheet(PDF) 8 Page - Microchip Technology

Part No. MCP23S17T-E/SP
Description  16-Bit I/O Expander with Serial Interface
Download  48 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP23S17T-E/SP Datasheet(HTML) 8 Page - Microchip Technology

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MCP23017/MCP23S17
DS21952B-page 8
© 2007 Microchip Technology Inc.
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. The pins must be biased externally.
1.4.1
ADDRESSING I2C DEVICES
(MCP23017)
The MCP23017 is a slave I2C interface 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 1-2 shows
the control byte format.
1.4.2
ADDRESSING SPI DEVICES
(MCP23S17)
The MCP23S17 is a slave SPI device. The slave
address contains four fixed bits and three user-defined
hardware address bits (if enabled via IOCON.HAEN)
(pins A2, A1 and A0) with the read/write bit filling out
the control byte. Figure 1-3 shows the control byte
format. The address pins should be externally biased
even if disabled (IOCON.HAEN = 0).
FIGURE 1-2:
I2C™ CONTROL BYTE
FORMAT
FIGURE 1-3:
SPI CONTROL BYTE
FORMAT
FIGURE 1-4:
I2C™ ADDRESSING REGISTERS
FIGURE 1-5:
SPI ADDRESSING REGISTERS
S
0
1
0
0
A2A1A0 R/W ACK
Start
bit
Slave Address
R/W bit
ACK bit
Control Byte
R/W = 0 = write
R/W = 1 = read
0
1
0
0
A2 A1 A0 R/W
Slave Address
R/W bit
Control Byte
R/W = 0 = write
R/W = 1 = read
CS
S0
1
0
0
A2 A1 A0
0
ACK*
A7
A6
A5
A4
A3
A2
A1
A0
ACK*
Device Opcode
Register Address
R/W = 0
*The ACKs are provided by the MCP23017.
0
100
A2
*
A1
*
A0
*
R/W
A7
A6A5A4A3A2A1A0
Device Opcode
Register Address
CS
* Address pins are enabled/disabled via IOCON.HAEN.


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