ak4538 AKM Semiconductor, Inc., ak4538 Datasheet - Page 38

• Manufacturer Part Number: ak4538
• Description: 16bit ?? Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
n Serial Control Interface
(1) 4-wire Serial Control Mode (I2C pin = “L”)
Internal registers may be written by using the 4-wire µP interface pins (CSN, CCLK, CDTI and CDTO). The data on this
interface consists of a 2-bit Chip address, Read/Write, Register address (MSB first, 5bits) and Control data (MSB first,
8bits). The chip address high bit is fixed to “1” and the lower bit is set by the CAD0 pin. Address and data is clocked in on
the rising edge of CCLK and data is clocked out on the falling edge. After a low-to-high transition of CSN, data is latched
for write operations and CDTO bit outputs Hi-Z. The clock speed of CCLK is 5MHz (max). The value of internal registers
is initialized at PDN pin = “L”.
MS0198-E-01
Write
Read
CSN
CCLK
CDTI
CDTO
CDTI
CDTO
C1 - C0 : Chip Address (C1="1", C0=CAD0)
R/W :
A4 - A0 : Register Address
D7 - D0 : Control Data
C1
C1
0
READ / WRITE ("1" : WRITE, "0" : READ)
C0
C0
1
R/W
R/W
2
Figure 34. Serial Control I/F Timing
A4
A4
3
A3
A3
4
Hi-Z
A2
A2
5
- 38 -
A1
A1
6
Hi-Z
A0
A0
7
D7
D7
8
D6
D6
9
D5
D5
10
D4
D4
11
D3
D3
12
D2
D2
13
D1
D1
14
D0
D0
15
[AK4538]
Hi-Z
2003/5