HN58X2432SI/HN58X2464SI

Rev.2.00, Jan.11.2005, page 8 of 20

Device Address (A0, A1, A2)

Eight devices can be wired for one common data bus line as maximum. Device address pins are used to

code provided from SDA pin matches corresponding hard-wired device address pins A0 to A2, that one

if unconnected.

Pin Connections for A0 to A2

Pin connection

Memory size

Max connect

number

A2

A1

A0

Notes

32k bit

8

×*

1

×*

1

×*

1

64k bit

8

×*

1

×*

1

×*

1

Notes: 1.

× = Don’t care (Open is also approval).

Write Protect (WP)

When the Write Protect pin (WP) is high, the write protection feature is enabled and operates as shown in

the following table. When the WP is low, write operation for all memory arrays are allowed. WP pin

should be fixed high or low status from start condition input to stop condition input. When left

unconnected, write operation for all memory arrays are allowed because the WP pin is internally pulled

Write Protect Area

WP pin status

Write protect area

All memory

Normal read/write operation