AK4490EQ Datasheet, PDF (49/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490]
■ Register Control Interface
(1) 3-wire Serial Control Mode (I2C pin = “L”)
Pins (parallel control mode) or registers (serial control mode) can control the functions of the AK4490. In
parallel control mode, the register setting is ignored, and in serial control mode the pin settings are ignored.
When the state of the PSN pin is changed, the AK4490 should be reset by the PDN pin. The serial control
interface is enabled by the PSN pin = “L”. Internal registers may be written to through3-wire µP interface pins:
CSN, CCLK and CDTI. The data on this interface consists of Chip address (2-bits, C1/0), Read/Write (1-bit;
fixed to “1”), Register address (MSB first, 5-bits) and Control data (MSB first, 8-bits). The data is output on a
falling edge of CCLK and the data is received on a rising edge of CCLK. The writing of data is valid when
CSN “”. The clock speed of CCLK is 5MHz (max).
Function
Parallel Control
Mode
Serial Control
Mode
Audio Format
Y
Y
Auto Setting Mode
Y
Y
De-emphasis
Y
Y
SMUTE
Y
Y
DSD Mode
-
Y
EX DF I/F
-
Y
Zero Detection
-
Y
Sharp Roll off filter
Y
Y
Slow Roll off filter
Y
Y
Minimum delay Filter
Y
Y
Digital Attenuator
-
Y
Table 28. Function List1 (Y: Available, -: Not available)
Setting the PDN pin to “L” resets the registers to their default values. In serial control mode, the internal timing
circuit is reset by the RSTN bit, but the registers are not initialized.
CSN
CCLK
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
CDTI
C1 C0 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
C1-C0: Chip Address (C1 bit =CAD1 pin, C0 bit =CAD0 pin)
R/W: READ/WRITE (Fixed to “1”, Write only)
A4-A0: Register Address
D7-D0: Control Data
Figure 28. Control I/F Timing
* The AK4490 does not support read commands in 3-wire serial control mode.
* When the AK4490 is in power down mode (PDN pin = “L”), writing into control registers is prohibited.
* The control data cannot be written when the CCLK rising edge is 15 times or less or 17 times or more during
CSN is “L”.
MS1648-E-03
- 49 -
2014/11