AK7750 Datasheet, PDF (68/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
(9) EEPROM Interface
1) Using the EEPROM interface
Since the AK7750 has an integrate EEPROM interface, PRAM, CRAM, OFRAM and Control Register data
can be loaded from the EEPROM after an initial RESET.
Use AKM’s 64Kbit/12Kbit serial EEPROM, the AK6512C/14C, when using the AK7750..
The data listed in section 2) Program Map, should be written into the EEPROM.
The following operations are required when using the EEPROM.
• Set EESEL pin to “H”, (after reaching a proper oscillation when a crystal oscillator is used ) and
set INIT_RESET pin to raise “H”. Then internal counter starts to run which generates EEPROM
control signals EECS , EESK and EESI, and EEPROM data is taken from EESO pin.
• After taking all data, EESK and EESI become “L” and EECS to “H”. EEST pin rises from “L” to
“H”, informing that loading has been completed. When EEST becomes “H”, interface with
microprocessor is enabled with EESEL pin as it stands at “H”. When reading is required again, set
INIT_RESET pin to “H” after executing initial reset ( INIT_RESET = “L”) with EESEL kept at “H”.
Note that hands-free parameters can not be downloaded via EEPROM interface.
[MS0296-E-00]
68
2005/03