SM5330A

SEIKO NPC CORPORATION —13

Slave Address

The 7-bit slave address is selected using the ADS pin. When ADS = “L” the address is 48h, when ADS = “H”

the address is 49h, and when ADS = “Z” (open) the address is 4Ah. A maximum of three SM5330A devices

each using the ADS pin.

Control Register

The SM5330A has a 5-byte control register.

The function of each byte in the control register is described in the following tables.

Sets the cutoff frequency. When FCM = “0” the filter is set to SD mode, and when FCM = “1” the filter is set to

HD mode. The relationship between the register value and the cutoff frequency is described in section “Low-

pass Filter”.

SLAVE ADDRESS for control register write

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

(Hex)

Description

Name

SLAVE ADDRESS

R/W

Value

10010000

90h

Indicate to write when device's slave

address is 48h (ADS = "L")

10010010

92h

Indicate to write when device's slave

address is 49h (ADS = "H")

10010100

94h

Indicate to write when device's slave

address is 4Ah (ADS = "Z")

SLAVE ADDRESS for status register read

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

(Hex)

Description

Name

SLAVE ADDRESS

R/W

Value

10010001

91h

Indicate to read when device's slave

address is 48h (ADS = "L")

10010011

93h

Indicate to read when device's slave

address is 49h (ADS = "H")

10010101

95h

Indicate to read when device's slave

address is 4Ah (ADS = "Z")

CONTROL REGISTER MAP

Addr.

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Description

00h

FCM

−

FCSET

Filter fc setting

01h

IM1

IM2

IM3

IM4

Input mode setting

02h

−

INSEL

−−

I/O1

I/O0

Input switch select, I/O output control

03h

DAC0

DAC_0 output control

04h

DAC1

DAC_1 output control

SUB ADDRESS: 00h

− Filter fc setting

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

(Hex)

Description

Name

FCM

−

FCSET

default

00000000

00h

Value

0

Set filter to SD mode (default)

1

Set filter to HD mode

00

000000

00h

fc = 5.11MHz (default)

00

:

:

:

00

111111

3Fh

fc = 13.30MHz

10

000000

80h

fc = 15.61MHz

10

:

:

:

10

111111

BFh

fc = 40.27MHz