DP7419 datasheet(10/16 Pages) COPAL

Part #	DP7419

Description	Dual Digital Potentiometers

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Manufacturer	COPAL [Copal Electronics]

Direct Link	http://www.nidec-copal-electronics.com/e

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10 / 16 page

DP7419

Doc. No. MD-2115 Rev. H

10

Characteristics subject to change without notice

The basic sequence of the three byte instructions is

illustrated in Figure 8. These three-byte instructions

exchange data between the WCR and one of the Data

Registers. The WCR controls the position of the wiper.

The response of the wiper to this action will be

delayed by tWRL. A transfer from the WCR (current

wiper position), to a Data Register is a write to non-

volatile memory and takes a maximum of tWR to

complete. The transfer can occur between one of the

potentiometers and one of its associated registers; or

the transfer can occur between all potentiometers and

one associated register.

Four instructions require a two-byte sequence to

complete, as illustrated in Figure 7. These instructions

transfer data between the host/processor and the

DP7419; either between the host and one of the data

registers or directly between the host and the Wiper

Control Register. These instructions are:

— XFR Data Register to Wiper Control Register

This transfers the contents of one specified Data

Register to the associated Wiper Control Register.

— XFR Wiper Control Register to Data Register

This transfers the contents of the specified Wiper

Control Register to the specified associated Data

Register.

— Global XFR Data Register to Wiper Control

Register

This transfers the contents of all specified Data

Registers to the associated Wiper Control Registers.

— Global XFR Wiper Counter Register to Data

Register

This transfers the contents of all Wiper Control

Registers

to

the

specified

associated

Data

Registers.

INCREMENT/DECREMENT COMMAND

The final command is Increment/Decrement (Figure 5

and

9).

The

Increment/Decrement

command

is

different

from

the

other

commands.

Once

the

command is issued and the DP7419 has responded

with an acknowledge, the master can clock the

selected wiper up and/or down in one segment steps;

thereby providing a fine tuning capability to the host.

For each SCL clock pulse (tHIGH) while SDA is HIGH,

the selected wiper will move one resistor segment

towards the RH terminal. Similarly, for each SCL clock

pulse while SDA is LOW, the selected wiper will move

one resistor segment towards the RL terminal.

See Instructions format for more detail.

Figure 7. Two-Byte Instruction Sequence

Figure 8. Three-Byte Instruction Sequence

Figure 9. Increment/Decrement Instruction Sequence

S

T

A

R

T

01

0

1

A2

A0

A

C

K

I2

I1

I0

R1 R0

A

C

K

SD

S

T

O

P

ID3 ID2 ID1 ID0

P0

Device ID

Internal

Instruction

Opcode

Address

Register

Address

Pot/WCR

Address

A1

A3

I3

0

A

I3

I2

I1

I0

R1 R0

ID3 ID2 ID1ID0

Device ID

Internal

Instruction

Opcode

Address

Data

Register

Address

Pot/WCR

Address

WCR[7:0]

or

Data Register D[7:0]

S

T

A

R

T

01

0

1

A2

A1

A0

A

C

K

0P0 A

C

K

SDA

S

T

O

P

A

C

K

D7

D6 D5 D4 D3 D2

D1 D0

A3

I3

I2

I1

I0

ID3 ID2 ID1 ID0

Device ID

Internal

Instruction

Opcode

Address

Data

Register

Address

Pot/WCR

Address

S

T

A

R

T

01

A2

A1 A0

A

C

K

R0

0

P0

A

C

K

SDA

S

T

O

P

I

N

C

1

I

N

C

2

I

N

C

n

D

E

C

1

D

E

C

n

R1

A3

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