ASAHI KASEI
[AK4644]
Serial Control Interface
(1) 3-wire Serial Control Mode (I2C pin = “L”)
Internal registers may be written by using the 3-wire µP interface pins (CSN, CCLK and CDTI). The data on this interface
consists of a 1-bit Chip address (Fixed to “1”), Read/Write (Fixed to “1”), Register address (MSB first, 6bits) and Control
data (MSB first, 8bits). Each bit is clocked in on the rising edge (“↑”) of CCLK. Address and data are latched on the 16th
CCLK rising edge (“↑”) after CSN falling edge(“↓”). Clock speed of CCLK is 5MHz (max). The value of internal
registers are initialized by PDN pin = “L”.
CSN
2
6
7
8
9
10 11
12 13 14 15
0
1
3
4
5
CCLK
CDTI
R/W
“1”
C1 A5
“1”
A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
C1:
R/W:
Chip Address; Fixed to “1”
READ/WRITE (“1”: WRITE, “0”: READ); Fixed to “1”
A5-A0: Register Address
D7-D0: Control data
Figure 61. Serial Control I/F Timing
MS0477-E-01
2006/10
- 62 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
