MCP413X datasheet(41/88 Pages) MICROCHIP

41 / 88 page

DS22060B-page 41

MCP413X/415X/423X/425X

6.0

SERIAL INTERFACE (SPI)

The MCP4XXX 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 Interfaces are 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

SDI

SDO

SDI

R1(2)

MCP41X1

SCK

SDI

SDO

MCP4XXX

SDO

SDI

SCK

( Master Out - Slave In (MOSI) )

( Master In - Slave Out (MISO) )

Host

Controller

Host

Controller

Typical SPI Interface Connections

Typical MCP41X1 SPI Interface Connections (Host Controller Hardware SPI)

SDI/SDO

SDI

SDO

I/O

MCP41X1

I/O

SCK

Host

Controller

Alternate MCP41X1 SPI Interface Connections (Host Controller Firmware SPI)

(SDO/SDI)

(SCK)

I/O (1)

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

implemented.

2: R1 must be sized to ensure VIL and VIH of the devices are met.

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