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MCP23S17T-E/ML

16-bit SPI I/O expander, 10MHz, 25mA/pin, QFN-28, cascading up to 8 devices

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Pieza del fabricante：

MCP23S17T-E/ML

Paquete：

QFN-28 / VQFN-28 (6.0 x 6.0 x 0.9 mm, 0.65mm pitch, exposed pad)

Descripción

Productos

The MCP23S17T-E/ML from Microchip Technology is a 16-bit I/O expander with SPI interface in a 28-pin QFN (6x6mm) package. It provides 16 bidirectional I/O pins with interrupt output, programmable via SPI at up to 10MHz. Three hardware address pins allow up to 8 devices on the same SPI bus.

Especificaciones

Interface	SPI (Mode 0 and Mode 3)
Number of I/Os	16 (two 8-bit ports: PORTA and PORTB)
Max SPI Clock	10 MHz
Tensión de alimentación	1.8V to 5.5V
Output Current per Pin	25 mA sink/source
Corriente de reposo	1 uA max (standby)
Operating Current	1 mA max @ SCK=1MHz
Interrupt Output	INTA and INTB (configurable)
Address Pins	3 (A0, A1, A2 for up to 8 devices)
ESD Protection	4 kV HBM
Power Dissipation	700 mW
Temperatura de funcionamiento	-40 to 125 C
Paquete	QFN-28 (6x6mm, exposed pad)

Características

16-bit remote bidirectional I/O expansion
High-speed SPI interface up to 10MHz
3 hardware address pins for cascading up to 8 devices
Two 16-bit configuration registers for I/O direction
Individual input polarity inversion
Interrupt-on-change from register defaults
Configurable interrupt output (active-high, active-low, open-drain)
INTA and INTB can be configured independently or mirrored
Power-on Reset (POR) circuit
Low standby current: 1uA max

Aplicaciones

Microcontroller I/O expansion via SPI
Keypad and matrix scanning
LCD interface expansion
LED control and status monitoring
Embedded system GPIO expansion

Introducción del producto:MCP23S17T-E/ML Presentación del producto

The MCP23S17T-E/ML from Microchip is a 16-bit SPI I/O expander in QFN-28 (6x6mm) package. Provides 16 bidirectional I/O pins with 25mA sink/source per pin and up to 10MHz SPI clock. Three address pins allow 8 devices on one bus. Features include interrupt-on-change, polarity inversion, POR, and 1uA standby current. The T suffix denotes tape-and-reel packaging, E denotes extended temperature range (-40 to 125C), and ML denotes QFN package.

Principio de funcionamiento:MCP23S17T-E/ML Principio de funcionamiento

The MCP23S17 is accessed via SPI (Mode 0 or Mode 3) using a standard SPI read/write protocol with an 8-bit opcode (device opcode + R/W bit) followed by a register address byte and data bytes. The 16 I/O pins are organized as two 8-bit ports (PORTA/GPA and PORTB/GPB), each with dedicated configuration registers for I/O direction (IODIRA/B), input polarity (IPOLA/B), interrupt-on-change control (GPINTENA/B), default comparison value (DEFVALA/B), and pull-up resistors (GPPUA/B). The interrupt output pins (INTA, INTB) can be configured to trigger on any pin change from a programmed default state, or on any change from the previous state (interrupt-on-change). The IOCON register configures global features like banking mode, interrupt mirroring, and open-drain interrupt output.

Descripción de la clavija:MCP23S17T-E/ML Definición y funciones de las clavijas

Pin	Nombre	Tipo	Función
1	GPB0	E/S	Port B bit 0
2	GPB1	E/S	Port B bit 1
3	GPB2	E/S	Port B bit 2
4	GPB3	E/S	Port B bit 3
5	GPB4	E/S	Port B bit 4
6	GPB5	E/S	Port B bit 5
7	GPB6	E/S	Port B bit 6
8	GPB7	E/S	Port B bit 7
9	VDD	Potencia	Positive supply (1.8-5.5V)
10	VSS	Suelo	Suelo
11	CS#	Entrada	SPI chip select (active low)
12	SCK	Entrada	SPI clock
13	SI	Entrada	SPI data in
14	SO	Salida	SPI data out
15	A0	Entrada	Hardware address bit 0
16	A1	Entrada	Hardware address bit 1
17	A2	Entrada	Hardware address bit 2
18	RESET#	Entrada	Reset (active low)
19	INTB	Salida	Interrupt output for Port B
20	INTA	Salida	Interrupt output for Port A
21-28	GPA0-GPA7	E/S	Port A bits 0-7