MCP433X datasheet(47/88 Pages) MICROCHIP

47 / 88 page

 2010 Microchip Technology Inc.

DS22242A-page 47

MCP433X/435X

6.0

SERIAL INTERFACE (SPI)

The MCP43XX devices support the SPI serial protocol.

This SPI operates in the Slave mode (does not

generate the serial clock).

The SPI interface uses up to four pins. These are:

•CS – Chip Select

• SCK – Serial Clock

• SDI – Serial Data In

• SDO – Serial Data Out

Typical SPI Interface is shown in Figure 6-1. In the SPI

interface, the Master’s Output pin is connected to the

Slave’s Input pin and the Master’s Input pin is

connected to the Slave’s Output pin.

The MCP4XXX SPI’s module supports two (of the four)

standard SPI modes. These are Mode 0,0 and 1,1. The

SPI mode is determined by the state of the SCK pin

(VIH or VIL) on the when the CS pin transitions from

inactive (VIH) to active (VIL or VIHH).

All SPI interface signals are high-voltage tolerant.

FIGURE 6-1:

Typical SPI Interface Block Diagram.

SDI

SDO

MCP4XXX

SDO

SDI

SCK

(Master Out – Slave In (MOSI))

(Master In – Slave Out (MISO))

Host

Controller

Typical SPI Interface Connections

I/O (1)

Note 1: If high voltage commands are desired, some type of external circuitry needs to be implemented.

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