|
AK5730VQ_17 Datasheet, PDF (37/50 Pages) Asahi Kasei Microsystems – 4-Channel Differential Audio ADC for Line & Mic Inputs | |||
|
◁ |
[AK5730]
(2). I2Cãã¹ã³ã³ããã¼ã«ã¢ã¼ã (SPI pin = âLâ)
AK5730ã®I2Cãã¹ã¢ã¼ãã®ãã©ã¼ãããã¯ãé«éã¢ã¼ã(max:400kHz)ã«å¯¾å¿ãã¦ãã¾ãã
(2)-1. WRITE å½ä»¤
I2Cãã¹ã¢ã¼ãã«ããããã¼ã¿æ¸ãè¾¼ã¿ã·ã¼ã±ã³ã¹ã¯Figure 33ã«ç¤ºããã¾ãããã¹ä¸ã®ICã¸ã®ã¢ã¯ã»ã¹ã«ã¯ãæåã«é
å§æ¡ä»¶ (Start Condition) ãå
¥åãã¾ããSCLã©ã¤ã³ã âHâã®æã«SDAã©ã¤ã³ã âHâãã âLâã«ããã¨ãéå§æ¡ä»¶ãä½ã
ãã¾ã(Figure 39)ãéå§æ¡ä»¶ã®å¾ãã¹ã¬ã¼ãã¢ãã¬ã¹ãéä¿¡ããã¾ãããã®ã¢ãã¬ã¹ã¯7ãããããæ§æããã8ãããç®ã«
ã¯ãã¼ã¿æ¹åããã(R/W) ãç¶ãã¾ããä¸ä½5ããã㯠â00100âåºå®ã次ã®2ãããã¯ã¢ã¯ã»ã¹ããICãé¸ã¶ããã®ã¢ãã¬
ã¹ãããã§ãCAD1, CAD0 pinã«ããè¨å®ããã¾ã(Figure 34)ãã¢ãã¬ã¹ãä¸è´ããå ´åãAK5730ã¯ç¢ºèªå¿ç
(Acknowledge) ãçæããå½ä»¤ãå®è¡ããã¾ãããã¹ã¿ã¯ç¢ºèªå¿çç¨ã®ã¯ããã¯ãã«ã¹ãçæããSDAã©ã¤ã³ã解æ¾ããª
ããã°ãªãã¾ãã(Figure 40)ãR/W bitã â0âã®å ´åã¯ãã¼ã¿æ¸ãè¾¼ã¿ãR/W bitã â1âã®å ´åã¯ãã¼ã¿èªã¿åºããè¡ã
ã¾ãã
第2ãã¤ãã¯ãµãã¢ãã¬ã¹(ã¬ã¸ã¹ã¿ã¢ãã¬ã¹)ã§ãããµãã¢ãã¬ã¹ã¯8ããããMSB firstã§æ§æãããä¸ä½2ããã㯠â0âåºå®
ã§ã(Figure 35)ã第3ãã¤ã以éã¯ã³ã³ããã¼ã«ãã¼ã¿ã§ããã³ã³ããã¼ã«ãã¼ã¿ã¯8ããããMSB firstã§æ§æããã¾ã
(Figure 36)ãAK5730ã¯ãåãã¤ãã®åä¿¡ãå®äºãããã³ã«ç¢ºèªå¿çãçæãã¾ãããã¼ã¿è»¢éã¯ãå¿
ããã¹ã¿ãçæ
ããåæ¢æ¡ä»¶ (Stop Condition) ã«ãã£ã¦çµäºãã¾ããSCLã©ã¤ã³ã âHâã®æã«SDAã©ã¤ã³ã âLâãã âHâã«ããã¨ãåæ¢
æ¡ä»¶ãä½ããã¾ã(Figure 39)ã
AK5730ã¯è¤æ°ã®ãã¤ãã®ãã¼ã¿ãä¸åº¦ã«æ¸ãè¾¼ããã¨ãã§ãã¾ãããã¼ã¿ã1ãã¤ãéã£ãå¾ãåæ¢æ¡ä»¶ãéããæ´ã«
ãã¼ã¿ãéãã¨ããµãã¢ãã¬ã¹ãèªåçã«ã¤ã³ã¯ãªã¡ã³ãããã次ã®ãã¼ã¿ã¯æ¬¡ã®ãµãã¢ãã¬ã¹ã«æ ¼ç´ããã¾ããã¢ãã¬ã¹
â2DHâã«ãã¼ã¿ãæ¸ãè¾¼ãã å¾ãããã«æ¬¡ã®ã¢ãã¬ã¹ã«æ¸ãè¾¼ãã å ´åã«ã¯ã¢ãã¬ã¹â00Hâã«ãã¼ã¿ãæ¸ãè¾¼ã¾ãã¾
ãã
ã¯ããã¯ã âHâã®éã¯ãSDAã©ã¤ã³ã®ç¶æ
ã¯ä¸å®ã§ãªããã°ãªãã¾ããããã¼ã¿ã©ã¤ã³ã âHâ㨠âLâã®éã§ç¶æ
ãå¤æ´ã§
ããã®ã¯ãSCLã©ã¤ã³ã®ã¯ããã¯ä¿¡å·ã âLâã®æã«éããã¾ã(Figure 41)ãSCLã©ã¤ã³ã âHâã®æã«SDAã©ã¤ã³ãå¤æ´ãã
ã®ã¯ãéå§æ¡ä»¶ãåæ¢æ¡ä»¶ãå
¥åããã¨ãã®ã¿ã§ãã
S
T
S
A
R/W="0"
T
R
O
T
P
SDA
S lave
S Address
S ub
A ddress(n)
Data(n)
Data(n+1)
Data(n+x)
P
A
A
A
A
A
A
C
C
C
C
C
C
K
K
K
K
K
K
Figure 33. I2Cãã¹ã¢ã¼ãã®ãã¼ã¿è»¢éã·ã¼ã±ã³ã¹
0
0
1
0
0 CAD1 CAD0 R/W
(CAD1,CAD0㯠pinã«ããè¨å®)
Figure 34. 第1ãã¤ãã®æ§æ
0
0
A5
A4
A3
A2
A1
A0
Figure 35. 第2ãã¤ãã®æ§æ
D7
D6
D5
D4
D3
D2
D1
D0
Figure 36. 第3ãã¤ã以éã®æ§æ
MS1577-J-03
- 37 -
2015/11
|
▷ |