MCP4641-502ESLASHMF datasheet(63/92 Pages) MICROCHIP

63 / 92 page

DS22107A-page 63

MCP454X/456X/464X/466X

7.6

Increment Wiper

Normal and High Voltage

The Increment Command provide a quick and easy

method to modify the potentiometer’s wiper by +1 with

minimal overhead. The Increment Command will only

function on the volatile wiper setting memory locations

00h and 01h. The Increment Command to Non-Volatile

addresses will be ignored and will generate a A.

When executing an Increment Command, the volatile

wiper setting will be altered from n to n+1 for each

Increment Command received. The value will incre-

ment up to 100h max on 8-bit devices and 80h on 7-bit

devices. If multiple Increment Commands are received

after the value has reached 100h (or 80h), the value will

not be incremented further. Table 7-4 shows the

Increment Command versus the current volatile wiper

value.

The Increment Command will most commonly be

performed on the Volatile Wiper locations until a

desired condition is met. The value in the Volatile Wiper

in order to write the new setting to the corresponding

Non-Volatile wiper memory using a Write operation.

The MCP4XXX is responsible for generating the A bits.

Refer to Figure 7-7 for the Increment Command

sequence. The sequence is terminated by the Stop

condition. So when executing a continuous command

string, The Increment command can be followed by any

other valid command. this means that writes do not

need to be to the same volatile memory address.

The advantage of using an Increment Command

instead of a read-modify-write series of commands is

speed and simplicity. The wiper will transition after each

Command Acknowledge when accessing the volatile

wiper registers.

TABLE 7-4:

INCREMENT OPERATION VS.

VOLATILE WIPER VALUE

7.6.1

THE HIGH VOLTAGE COMMAND

(HVC) SIGNAL

The High Voltage Command (HVC) signal is multi-

plexed with Address 0 (A0) and is used to indicate that

the command, or sequence of commands, are in the

High Voltage mode. Signals > VIHH (~8.5V) on the

HVC/A0 pin puts MCP45XX/46XX devices into High

Voltage mode. High Voltage commands allow the

device’s WiperLock Technology and write protect

features to be enabled and disabled.

The HVC pin has an internal resistor connection to the

MCP45XX/46XXs internal VDD signal.

FIGURE 7-7:

I2C Increment Command Sequence.

Note:

Table 7-2 shows the valid addresses for

the Increment Wiper command. Other

addresses are invalid.

Note:

The command sequence can go from an

increment to any other valid command for

the specified address. Issuing an incre-

ment or decrement to a non-volatile loca-

tion will cause an error condition (A will be

generated).

Current Wiper

Setting

Wiper (W)

Properties

Increment

Command

Operates?

7-bit

Pot

8-bit

Pot

3FFh

081h

3FFh

101h

Reserved

(Full-Scale (W = A))

080h

100h

Full-Scale (W = A)

07Fh

041h

0FFh

081

W = N

040h

080h

W = N (Mid-Scale)

Yes

03Fh

001h

07Fh

001

W = N

000h

Zero Scale (W = B) Yes

Note:

There is a required delay after the HVC pin

is driven to the VIHH level to the 1st edge

of the SCL pin.

Control Byte

INCR Command (n+1)

INCR Command (n+2)

SA2 A1 A0 0

AD AD AD AD

A1 x

X A

AD AD AD AD

A P (2)

432

Fixed

Address

Variable

Address

Device

Memory

Address

Command

Write bit

Note 1:

Increment Command (INCR) only functions when accessing the volatile wiper reg-

isters (AD3:AD0 = 0h and 1h).

This command sequence does not need to terminate (using the Stop bit) and can

change to any other desired command sequence (Increment, Read, or Write).

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