MCP4331-104ESLASHML datasheet(54/88 Pages) MICROCHIP

54 / 88 page

MCP433X/435X

DS22242A-page 54

 2010 Microchip Technology Inc.

7.4

Continuous Commands

The device supports the ability to execute commands

continuously. While the CS pin is in the active state (VIL

or VIHH). Any sequence of valid commands may be

received.

The following example is a valid sequence of events:

CS pin driven active (VIL or VIHH).

Read Command.

Increment Command (Wiper 0).

Decrement Command (Wiper 1).

Write Command (volatile memory).

CS pin driven inactive (VIH).

Note 1: It is recommended that while the CS pin is

active, only one type of command should

be issued. When changing commands, it

is recommended to take the CS pin

inactive then force it back to the active

state.

2: It is also recommended that long

command strings should be broken down

into shorter command strings. This

reduces the probability of noise on the

SCK pin corrupting the desired SPI

command string.

TABLE 7-3:

COMMANDS

Command Name

# of

Bits

High

Voltage

(VIHH) on

CS pin?

Write Data

16-Bits

—

Read Data

16-Bits

—

Increment Wiper

8-Bits

—

Decrement Wiper

8-Bits

—

High-Voltage Write Data

16-Bits

Yes

High-Voltage Read Data

16-Bits

Yes

High-Voltage Increment Wiper

8-Bits

Yes

High-Voltage Decrement Wiper

8-Bits

Yes

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