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參數(shù)資料
| 型號： | SAA7740H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Digital Audio Processing IC DAPIC |
| 中文描述： | 4-BIT, 23 MHz, OTHER DSP, PQFP64 |
| 封裝： | 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, QFP-64 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 142K |
| 代理商： | SAA7740H |
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1997 May 30
13
Philips Semiconductors
Product specification
Digital Audio Processing IC (DAPIC)
SAA7740H
Improper acknowledge generated by the DAPIC
If an I
2
C-bus device, other than DAPIC, is addressed by the master then the DAPIC will generate a short acknowledge
pulse. The DAPIC starts pulling down the SDA line at the trailing edge of the SCL clock pulse. and releases the SDA line
approximately 390 ns after the leading edge of the following SCL LOW-to-HIGH transition (see Fig.8).
This improper acknowledge pulse can cause the I
2
C-bus master to detect an incorrect acknowledgement, depending on
the capturing moment of the SDA line by the I
2
C-bus master. Any possible non-acknowledgements of involved I
2
C-bus
devices, including the SAA7740H, will be masked thus making the system unreliable.
To avoid these problems the I
2
C-bus master should only capture the SDA line at such a moment that the improper
acknowledge pulse will not be detected.
Fig.8 Improper acknowledge generated by the DAPIC.
handbook, full pagewidth
MGK425
data output
from DAPIC
SCL from
master
S
START condition
1
2
7
8
9
data output
from transmitter
390 ns (typ)
non-DAPIC device address
improper acknowledge
generated by DAPIC
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