AK9822 데이터 시트보기 (PDF) - Asahi Kasei Microdevices

부품명

상세내역

일치하는 목록

AK9822

2K / 4Kbit EEPROM with 2ch 8bit D/A Converter

Asahi Kasei Microdevices 

ASAHI KASEI

[AK9822/24]

„ Output of D/A converter

The output of the D/A converters can be set by the WRITE and the CALL instructions.

Upper 8bit data (D15∼D8) of the first address of the internal EEPROM (the address "0")

corresponds to "AO" of the D/A converter output. Lower 8bit data (D7∼D0) of the address "0"

corresponds to "A1". The internal composition of EEPROM is shown in the table2.

Address

0

1

D15∼D8

D7∼D0

Set data of A0 Set data of A1

General purpose memory

127(AK9822)

/255(AK9824)

General purpose memory

Table2. Internal composition of EEPROM

If the WRITE instruction by which the address "0" is specified is executed at the normal mode, the

outputs of the D/A converter of A0 and A1 are set by the specified data.

When the WRITE instruction by which the address "0" is specified is executed at the WRITE enable

state and the normal mode, the data is written in the address "0" of EEPROM and the outputs of the

D/A converter are set. When the WRITE instruction by which the address "0" is specified is

executed at the WRITE disable state and the normal mode, the data is not written in EEPROM and

the outputs of the D/A converter are set. Table3 shows the relation between EEPROM, D/A

converter and WRITE instruction.

State of AK9822/24

State of address"0"

Output of A0 and A1

Power down

mode

WRITE enable The data change to the specified data.

WRITE disable The data does not change.

The DAC outputs

are "Hi-Z".

Normal mode

WRITE enable The data change to the specified data.

WRITE disable The data does not change.

The DAC outputs

change to the

specified data.

Table3. Relation between EEPROM, D/A converter and WRITE instruction

If the CALL instruction is executed, the outputs of the D/A converter are set by the data of the

general purpose memory (AK9822:address "1" -"127", AK9824:address "1" -"255"). The CALL

instruction is composed by the op-code and the address.

When the CALL instruction is executed at the normal mode, the D/A converter output of A0 is set by

the upper 8bit data (D15∼D8) of the specified address and the output of A1 is set by the lower 8bit

data (D7∼D0). The CALL instruction is not executed at the power down mode.

DAD01E-00

-4-

1999/05

Share Link: