LV5234V

No.A1936-9/24

Serial Bus Communication Specifications

1) 3-wire serial bus transfer timing conditions

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Cycle time

tcy1

SCLK clock period

200

-

-

ns

Data setup time

ts0

SDEN setup time relative to the rise of SCLK

90

-

-

ns

ts1

SDATA setup time relative to the rise of SCLK

60

-

-

ns

Data hold time

th0

SDEN hold time relative to the fall of SCLK

200

-

-

ns

th1

SDATA hold time relative to the fall of SCLK

60

-

-

ns

Pulse width

tw1L

Low period pulse width of SCLK

90

-

-

ns

tw1H

High period pulse width of SCLK

90

-

-

ns

tw2L

Low period pulse width of SDEN

1

-

-

μs

Data length:

24 bits

Clock frequency: 5 MHz or less

When 24 SCLK clock signals have been input during the high period of SDEN, the SDATA is taken in at the rising edge of

SCLK.

Note: If the number of SCLK clock signals during the high period of SDEN is 23 or less, SDATA is not taken in. If it is 25 or

more, the register address is automatically incremented every time 1 byte is taken in.

The slave address is assigned by the first byte, and the register address on the serial map is specified by the next byte.

The third byte transfers the data to the address specified by the register address that was written by the second byte and if the

data subsequently continues even after this, the register address is automatically incremented for the fourth and subsequent

bytes. As a result, it is possible to send the data continuously from the specified addresses. Data of less than one byte is ignored.

However, when the address reaches 15h, in the next byte to be transferred becomes 00h.

tw2H

SA7 SA6 SA5 SA4 SA3 SA2 SA1 SA0

A7

A6

A5

A4

A3

A2

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

SA7

ts0

ts1

th1

tcy1

tw1L

tw1H

th0

50%

SDEN

SCLK

SDATA

0 1 0 0 0 0 1 -

0 0 0 0 0 1 1 1

SDATA

SDEN

SDATA

SDEN

Example of a write operation:

DATA1

Slave address

Register address 07h is set

Data is written into address 07h.

DATA2

DATA3

DATA

Data is written into

address 08h.

Data is written into

address 09h.

Ignore if data is

less than 1 byte.