MCP23017 - 16-Bit I/O Expander with Serial Interface


GPB0	1 •	28	GPA7
GPB1	2	27	GPA6
GPB2	3	26	GPA5
GPB3	4	25	GPA4
GPB4	5	24	GPA3
GPB5	6	23	GPA2
GPB6	7	22	GPA1
GPB7	8	21	GPA0
V_DD	9	20	INTA
V_SS	10	19	INTB
NC	11	18	RESET
SCL	12	17	A2
SDA	13	16	A1
NC	14	15	A0

Pin	Symbol	Description
1	GPB0	Bidirectional I/O pin.
2	GPB1	Bidirectional I/O pin.
3	GPB2	Bidirectional I/O pin.
4	GPB3	Bidirectional I/O pin.
5	GPB4	Bidirectional I/O pin.
6	GPB5	Bidirectional I/O pin.
7	GPB6	Bidirectional I/O pin.
8	GPB7	Bidirectional I/O pin.
9	V_DD	Power
10	V_SS	Ground
11	NC	Not connected
12	SCL	Serial clock input
13	SDA	Serial data I/O
14	NC	Not connected
15	A0	Hardware address pin. Must be externally biased.
16	A1	Hardware address pin. Must be externally biased.
17	A2	Hardware address pin. Must be externally biased.
18	RESET	Hardware reset. Must be externally biased.
19	INTB	Interrupt output for PORTB. Can be configured as active-high, active-low or open-drain.
20	INTA	Interrupt output for PORTB. Can be configured as active-high, active-low or open-drain.
21	GPA0	Bidirectional I/O pin.
22	GPA1	Bidirectional I/O pin.
23	GPA2	Bidirectional I/O pin.
24	GPA3	Bidirectional I/O pin.
25	GPA4	Bidirectional I/O pin.
26	GPA5	Bidirectional I/O pin.
27	GPA6	Bidirectional I/O pin.
28	GPA7	Bidirectional I/O pin.

Note: Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.