FEDL7029-04

ML7029

7/29

DEN, EXCK, DIN, DOUT

Serial control ports for MCU interface.

Reading and writing data are performed by an external MCU through these pins. The 8-byte cotrol registers

(CR0 to 7) are provided on the device.

DEN is the “Enable” control signal input, EXCK is the data shift clock input, DIN is the address and data input,

and DOUT is the data output.

Figures 2-1 and 2-2 show the input/output timing diagram. During power-down, the DOUT output is in a high

impedance state.

Figure 2-1 MCU Interface Input/Output Timing (DIN = 12 bits)

(a) Data Write Timing Diagram

(b) Data Read Timing Diagram

EXCK

A2

A1

A0

W

B7 B6

B5

B4

B3

B2

B1

B0

DEN

DIN

DOUT

High Impedance

EXCK

DEN

A2

A1

A0

R

DIN

B7 B6

B5

B4

B3

B2

B1

B0

DOUT

High Impedance

EXCK

DEN

DIN

EXCK

DEN

DIN

Figure 2-2 MCU Interface Input/Output Timing (DIN = 16 bits)

DOUT

DOUT

B7 B6

B5

B4

B3

B2

B1

B0

(a) Data Write Timing Diagram

High Impedance

A2

A1

A0

W

(b) Data Read Timing Diagram

A2

A1

A0

R

B7 B6

B5

B4

B3

B2

B1

B0

High Impedance