AK4586 Datasheet, PDF (35/54 Pages) Asahi Kasei Microsystems – MULTI CHANNEL AUDIO CODEC WITH DIR

ASAHI KASEI
[AK4586]
Serial Control Interface
(1) 4-wire Serial Control Mode (I2C = “L”)
The internal registers may be either written or read by the 4-wire µP interface pins: CSN, CCLK, CDTI & CDTO. The
data on this interface consists of Chip address (2bits, CAD1-0 are fixed to “00”), Read/Write (1bit), Register address
(MSB first, 5bits) and Control data (MSB first, 8bits). Address and data is clocked in on the rising edge of CCLK and data
is clocked out on the falling edge. For write operations, data is latched after the 16th rising edge of CCLK, after a
high-to-low transition of CSN. For read operations, the CDTO output goes high impedance after a low-to-high transition
of CSN. The maximum speed of CCLK is 5MHz. PDN= “L” resets the registers to their default values.
CSN
CCLK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
CDTI
WRITE
CDTO
READ
CDTI
CDTO
C1 C0 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
Hi-Z
C1 C0 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
Hi-Z
Hi-Z
D7 D6 D5 D4 D3 D2 D1 D0
C1-0: Chip Address (Fixed to “00”)
R/W: READ/WRITE (0:READ, 1:WRITE)
A4-A0: Register Address
D7-D0: Control Data
Figure 21. 4-wire Serial Control I/F Timing
MS0097-E-01
- 35 -
2001/12