SAA7740 Philips Semiconductors, SAA7740 Datasheet - Page 13

• Manufacturer Part Number: SAA7740
• Description: Digital Audio Processing IC DAPIC
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Improper acknowledge generated by the DAPIC
If an I
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
the capturing moment of the SDA line by the I
devices, including the SAA7740H, will be masked thus making the system unreliable.
To avoid these problems the I
acknowledge pulse will not be detected.
1997 May 30
handbook, full pagewidth
Digital Audio Processing IC (DAPIC)
2
C-bus device, other than DAPIC, is addressed by the master then the DAPIC will generate a short acknowledge
data output
from transmitter
data output
from DAPIC
SCL from
master
2
C-bus master should only capture the SDA line at such a moment that the improper
START condition
Fig.8 Improper acknowledge generated by the DAPIC.
S
1
2
non-DAPIC device address
C-bus master. Any possible non-acknowledgements of involved I
2
2
C-bus master to detect an incorrect acknowledgement, depending on
13
7
8
390 ns (typ)
9
improper acknowledge
generated by DAPIC
MGK425
Product specification
SAA7740H
2
C-bus