MCP23017 - Microchip

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MCP23017/MCP23S17 Functional Block Diagram CS SCK SI SO SCL SDA A2:A0 RESET INTA INTB SPI I 2 C 3 Decode Interrupt Logic MCP23S17 MCP23017 Serializer/ Deserializer Control 8 Configuration/ Control Registers GPB7 GPB6 GPB5 GPB4 GPB3 GPB2 GPB1 GPB0 DS21952B-page 2 © 2007 Microchip Technology Inc. 16 GPIO GPIO GPA7 GPA6 GPA5 GPA4 GPA3 GPA2 GPA1 GPA0
1.0 DEVICE OVERVIEW The MCP23017/MCP23S17 (MCP23X17) device family provides 16-bit, general purpose parallel I/O expansion for I 2 C bus or SPI applications. The two devices differ only in the serial interface. • MCP23017 – I 2 C interface • MCP23S17 – SPI interface The MCP23X17 consists of multiple 8-bit configuration registers for input, output and polarity selection. The system master can enable the I/Os as either inputs or outputs by writing the I/O configuration bits (IODIRA/B). The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master. The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and PORTB). The MCP23X17 can be configured to operate in the 8-bit or 16-bit modes via IOCON.BANK. MCP23017/MCP23S17 There are two interrupt pins, INTA and INTB, that can be associated with their respective ports, or can be logically OR’ed together so that both pins will activate if either port causes an interrupt. The interrupt output can be configured to activate under two conditions (mutually exclusive): 1. When any input state differs from its corresponding Input Port register state. This is used to indicate to the system master that an input state has changed. 2. When an input state differs from a preconfigured register value (DEFVAL register). The Interrupt Capture register captures port values at the time of the interrupt, thereby saving the condition that caused the interrupt. The Power-on Reset (POR) sets the registers to their default values and initializes the device state machine. The hardware address pins are used to determine the device address. © 2007 Microchip Technology Inc. DS21952B-page 3
Page 1: Features • 16-bit remote bidirect
Page 5 and 6: 1.2 Power-on Reset (POR) The on-chi
Page 7 and 8: FIGURE 1-1: MCP23017 I 2 C DEVICE P
Page 9 and 10: 1.5 GPIO Port The GPIO module is a
Page 11 and 12: TABLE 1-6: CONTROL REGISTER SUMMARY
Page 13 and 14: 1.6.2 INPUT POLARITY REGISTER This
Page 15 and 16: 1.6.4 DEFAULT COMPARE REGISTER FOR
Page 17 and 18: 1.6.6 CONFIGURATION REGISTER The IO
Page 19 and 20: 1.6.7 PULL-UP RESISTOR CONFIGURATIO
Page 21 and 22: 1.6.9 INTERRUPT CAPTURE REGISTER Th
Page 23 and 24: 1.6.11 OUTPUT LATCH REGISTER (OLAT)
Page 25 and 26: 1.7.5 INTERRUPT CONDITIONS There ar
Page 27 and 28: 2.0 ELECTRICAL CHARACTERISTICS Abso
Page 29 and 30: MCP23017/MCP23S17 FIGURE 2-1: LOAD
Page 31 and 32: MCP23017/MCP23S17 TABLE 2-2: I 2 C
Page 33 and 34: FIGURE 2-6: SPI OUTPUT TIMING CS SC
Page 35 and 36: TABLE 2-4: GP AND INT PINS AC Chara
Page 37 and 38: 3.0 PACKAGING INFORMATION 3.1 Packa
Page 39 and 40: MCP23017/MCP23S17 28-Lead Plastic Q
Page 41 and 42: 28-Lead Plastic Shrink Small Outlin
Page 43 and 44: APPENDIX A: REVISION HISTORY Revisi
Page 45 and 46: PRODUCT IDENTIFICATION SYSTEM MCP23
Page 47 and 48: Note the following details of the c

MCP23017 - Microchip

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