Technical Note

11/18

BU6520KV,BU6521KV

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2010.02 - Rev.C

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4. SPI-bus Interface Timing

SCK

SCEB

SDO

SDI

Fig.8 SPI-bus Interface Timing

Symbol

Description

MIN

TYP

MAX

Unit

Clock Cycle

2

736*1

8192

Clock Duty

45

50

55

%

SCK Rise SCEB Setup Time

4

738～

1105

*1

12289

SCEB Rise after SCK Rise Time

2

751

*1

8319

Decision of SDO from SCK Fall

-

-

28

ns

SCK Rise SDI Setup Time

-

-

28

ns

SCK Rise SDI Hold Time

-

-

28

ns

*1

Default status right after reset

When the automatic reading function with the AUTO pin is used, it becomes timing of SCEB to SCK as above.

It is possible to access from the register of BU6520KV/BU6521KV to EEPROM.In that case, SCEB is controlled by the

register.

After the value is set to the register, the SCEB pin is changed into the logic set at once.