MCP4641-503ESLASHST datasheet(57/92 Pages) MICROCHIP

57 / 92 page

DS22107A-page 57

MCP454X/456X/464X/466X

7.2

Data Byte

Only the Read Command and the Write Command

have Data Byte(s).

The Write command concatenates the 8-bits of the

Data Byte with the one data bit (D8) contained in the

Command Byte to form 9-bits of data (D8:D0). The

Command Byte format supports up to 9-bits of data so

that the 8-bit resistor network can be set to Full-Scale

(100h or greater). This allows wiper connections to

Terminal A and to Terminal B. The D9 bit is currently

unused.

7.3

Error Condition

If the four address bits received (AD3:AD0) and the two

command bits received (C1:C0) are a valid combina-

tion, the MCP4XXX will Acknowledge the I2C bus.

If the address bits and command bits are an invalid

combination, then the MCP4XXX will Not Acknowledge

the I2C bus.

Once an error condition has occurred, any following

commands are ignored until the I2C bus is reset with a

Start Condition.

7.3.1

ABORTING A TRANSMISSION

A Restart or Stop condition in the expected data bit

position will abort the current command sequence and

data will not be written to the MCP4XXX.

TABLE 7-3:

COMMANDS

Command Name

Writes

Value in

EEPROM

Operates on

Volatile/

Non-Volatile

memory

High

Voltage

(VIHH) on

HVC pin?

Impact on

WiperLock or

Write Protect

Works

when

Wiper is

“locked”?

Write Data

Yes (1)

Both

—

unlocked (1)

Read Data

—

Both

—

unlocked (1)

Increment Wiper

—

Volatile Only

—

unlocked (1)

Decrement Wiper

—

Volatile Only

—

unlocked (1)

High Voltage Write Data

Yes

Both

Yes

unchanged

High Voltage Read Data

—

Both

Yes

unchanged

Yes

High Voltage Increment Wiper

—

Volatile Only

Yes

unchanged

High Voltage Decrement Wiper

—

Volatile Only

Yes

unchanged

Modify Write Protect or WiperLock

Technology (High Voltage) - Enable

— (2)

Non-Volatile

Only (2)

Yes

locked/

protected (2)

Yes

Modify Write Protect or WiperLock

Technology (High Voltage) - Disable

— (3)

Non-Volatile

Only (3)

Yes

unlocked/

unprotected (3)

Yes

Note 1:

This command will only complete, if wiper is “unlocked” (WiperLock Technology is Disabled).

If the command is executed using address 02h or 03h, that corresponding wiper is locked or

if with address 0Fh, then Write Protect is enabled.

If the command is executed using with address 02h or 03h, that corresponding wiper is unlocked or

if with address 0Fh, then Write Protect is disabled.

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