AK7750 Datasheet, PDF (10/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
Pin Pin Name
I/O
Function
Pin Classification
NO.
20 SDIN3/JX2
I DSP Serial Data Input pin/External Conditional pin (pulled-
Digital
down)
Serial data input
- Supports MSB-justified 24 Bit/LSB-justified 24 Bit, 20 Bit, /conditional input
and 16 Bit data formats.
- This pin can be used as external conditional jump pin JX2
by setting a control register.
- This pin cannot be used as a Serial Data input pin nor
external conditional pin during hands-free mode.
21 SDIN2
I
DSP Serial
Supports
Data Input pin (pulled-down)
MSB-justified 24 Bit/ LSB-justified
24
Bit,
20
Bit,
and
Digital
Serial Data
Input
16 Bit data format.
22 SDIN1
I _{DSP Serial Data Input pin (pulled-down)}
Supports MSB-justified 24 Bit/ LSB-justified 24 Bit, 20 Bit, and
16 Bit data format.
23 DVSS
- Digital Ground pin 0 V
Digital Power Supply
24 DVDD
- Digital Power Supply pin 3.3 V (typ)
25 _{INIT_RESET} I Initial Reset N pin (for initialization)
Reset
This is used to initialize the AK7750.This is also used to
change CKS1 and CKS0 pin settings and to change XTI input
frequency.
26 _{CK_RESET} I _{CK Reset N pin}
This pin is used while S_RESET is at “low” to change XTI
input frequency and to change CKS2, CKS1, CKS0 settings.
CK_RESET bit in control register has similar function.
When CK_RESET bit is used, CK_RESET pin must be
commonly controlled with INIT_RESET pin or it must be set
to “high”.
27 _{S_RESET}
I System Reset N pin
28 DVDD
29 DVSS
30 _CS
(EESEL=”L”)
- Digital Power Supply pin 3.3 V (typ)
Digital Power Supply
- Digital Ground pin 0 V
I _{Chip Select pin for µC interface (pulled-down)}
Digital Power Supply
µC
Leave open or connect to DVSS for normal operation
When CS =”H”, data on SI pin is not written and SO, RDY,
DRDY pins become Hi-Z state.
This function is not available at EESEL=”H”.
EESO
(EESEL=”H”)
I _{EEPROM Serial Data Output pin (pulled-down)}
Connect this pin to SO pin of AK6512C / 14C.
EEP
31 _HFST
O Hands-Free Status pin
µC
Normally at “H” but when an error occurs, it switches to “L”
(EESEL=”L”)
level.
HFST
EEST
(EESEL=”H”)
O Hands-Free Status pin / EEPROM write status pin
µC /EEP
Normally at “H” but when an error occurs, it switches to “L”.
Level (SWEE bit = 0 in control register).
When data read from EEPROM is complete, EEST changes
from “L” to “H”. The µC input interface is enabled (SWEE bit =
1 in control register).
[MS0296-E-00]
10
2005/03