AK9822 Datasheet, PDF (9/17 Pages) Asahi Kasei Microsystems – 2K / 4Kbit EEPROM with 2ch 8bit D/A Converter

ASAHI KASEI
[AK9822/24]
„ WREN/WRDS
There are two states such as the WRITE enable state and the WRITE disable state in the
AK9822/24. In the WRITE disable state the WRITE instruction becomes invalid and is not executed.
When Vcc is applied to the part, it powers up in the WRITE disable state. The WRITE instruction
must be preceded by a WREN instruction. This state remains enabled until a WRDS instruction is
executed or Vcc is removed from the part.
Execution of a read instruction is not affected by both WREN and WRDS instruction.
WREN/WRDS (AK9822/24)
„ PDEN/PDDS
There are two modes such as the power down mode and the normal mode in the AK9822/24. The
mode of the part can be switched by the PDEN and PDDS instructions. The AK9822/24 becomes
the power down mode by inputting the PDEN instructions. When the PDDS instruction is executed,
the part becomes the normal mode.
When returning to the normal mode from the power down mode, the D/A converters output the
voltage value set before entering the power down mode.
DAD01E-00
PDDS (AK9822/24)
-9-
1999/05