ASAHI KASEI

[AK4254]

MS0586-E-01

2007/08

- 10 -

OPERATION OVERVIEW

In Serial Control Mode (P/S pin= “L”), it is recommended that AK4254 is powered up when the PDN pin= “L”. If the

AK4254 is powered up when the PDN pin = “H”, the AK4254 should be reset by the PDN pin = “L” after power up. The

control registers are initialized to their default values by resetting. In Parallel Control Mode, resetting by the PDN pin =

“L” is not needed when power up.

The AK4524 is in Parallel Control Mode at P/S pin = “H”. When the AK4524 is in Parallel Control Mode, all registers

can not be accessed.

Mode

PDN pin

SEL12-10 pin

CVEE1 pin

VOUT1 pin

Power Down mode

L

x

GND

GND

H

“LLL”

GND

GND

Normal mode

H

Except for

“LLL”

-CVDD1

Video signal

output

(x: Don’t Care)

Table 1. VOUT1 mode setting (Parallel Control Mode)

Mode

PDN pin

SEL22-20 pin

CVEE2 pin

VOUT2 pin

Power Down mode

L

x

GND

GND

H

“LLL”

GND

GND

Normal mode

H

Except for

“LLL”

-CVDD1

Video signal

output

(x: Don’t Care)

Table 2. VOUT2 mode setting (Parallel Control Mode)

(a) Power Down mode (PDN pin= “L”)

The AK4524 is in Power Down mode at the PDN pin = “L”. When the AK4524 is in the Power Down mode, the

VOUT1-2 outputs are “GND”.

(b) Normal mode (PDN pin= “H”)

The AK4524 have 7:2 video switches. In Parallel Control Mode, the each input of VOUT1-2 is set by SEL12-10 pins and

SEL22-20 pins.

SEL12 pin

SEL11 pin

SEL10 pin

VOUT1 pin

L

L

L

Off Note: 13)

L

L

H

VIN1

L

H

L

VIN2

L

H

H

VIN3

H

L

L

VIN4

H

L

H

VIN5

H

H

L

VIN6

H

H

H

VIN7

Note: 13. When the input setting is “Off”, VOUT1 output is “GND”.

Table 3. Input Selector 1 (Parallel Control Mode)