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參數(shù)資料
| 型號： | 935272775118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PQCC16 |
| 封裝： | 4 X 4 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT-629-1, HVQFN-16 |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 153K |
| 代理商： | 935272775118 |
Philips Semiconductors
Product data
PCA9557
8-bit I2C and SMBus I/0 port with reset
2002 Dec 13
9
Acknowledge
The number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. Each byte of eight bits
is followed by one acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter whereas the master generates an
extra acknowledge related clock pulse.
A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master must generate an
acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges has to pull down
the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clock
pulse, set-up and hold times must be taken into account.
A master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of
the slave. In this event, the transmitter must leave the data line HIGH to enable the master to generate a stop condition.
DATA OUTPUT
BY TRANSMITTER
SCL FROM
MASTER
SW00368
DATA OUTPUT
BY RECEIVER
12
89
S
START condition
clock pulse for
acknowledgement
acknowledge
not acknowledge
Figure 12. Acknowledgement on the I2C-bus
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