ak4101a AKM Semiconductor, Inc., ak4101a Datasheet - Page 21

• Manufacturer Part Number: ak4101a
• Description: Quad Outputs 192khz 24-bit Dit
• Manufacturer: AKM Semiconductor, Inc.

n Serial Control Interface
In asynchronous mode, four of the dual function pins become CSN, CCLK, CDTI and CDTO, a 4 wire microprocessor
interface. The internal 66 byte control register can then be read and written. The contents of the control register define,
in part, the mode of operation for the AK4101A. Figure 19 illustrates the serial data flow associated with SCI read and
write operations. C1-0 bits are the chip address. The AK4101A looks for C1-0 bits to be a “11” before responding to the
incoming data. R/W is the Read/Write bit which is “0” for a read operation and “1” for a write operation. The register
address contained in A7-0 bits is decoded to select a particular byte of the control register. D7-0 bits on CDTI pin is the
control data coming from the microprocessor during a write operation. D7-0 bits on CDTO pin is the contents of the
addressed byte from the control register requested during a read operation. The address and data bits are framed by CSN
pin = “0”. During a write operation, each address and data bit is sampled on the rising edge of CCLK. During a read
operation, the address bits are sampled on the rising edge of CCLK while data on CDTO is output on the falling edge of
CCLK. CCLK has a maximum frequency of 5 MHz.
MS0250-E-00
WRITE
READ
CCLK
CDTO
CDTO
CSN
CDTI
CDTI
C1
C1
0
C0
C0
Note: External pull-up resistor should not be attached to CDTO pins
1
2
*
Hi-Z (with pull-down resistor)
Hi-Z (with pull-down resistor)
*
since CDTO pin is internally connected to the pull-down resistor.
3
*
*
AK4101A
AK4101A
4
*
C1-C0: Chip Address (Fixed to “11”)
R/W:
*:
A7-A0: Register Address
D7-D0: Control Data
*
Figure 20. Typical connection with P
5
*
*
CDTO
CDTO
Figure 19. Control I/F Timing
CCLK
CCLK
CDTI
CDTI
CSN
CSN
6
*
*
READ/WRITE (0:READ, 1:WRITE)
Don’t care
R/W
R/W
7
A7
A7
8
A6
A6
- 21 -
9
A5
10
A5
A4
11
A4
A3
12
A3
CSN1
CCLK
CDTI
CDTO
CSN2
A2
A2
13
A1
A1
14
P
A0
A0
15
D7
D7
D7
16
17
D6
D6
D6
D5
D5
D5
18
19
D4
D4
D4
“L”
D3
20
D3
D3
D2
21
D2
D2
D1
22
D1
D1
D0
23
D0
D0
2003/07
Hi-Z