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参数资料
| 型号： | 935008900112 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | TELEPHONE MULTIFUNCTION CKT, PDIP14 |
| 封装： | 0.300 INCH, PLASTIC, SOT-27-1, MO-001AA, DIP-14 |
| 文件页数： | 3/32页 |
| 文件大小： | 253K |
| 代理商： | 935008900112 |
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1996 Nov 21
11
Philips Semiconductors
Product specication
DTMF/modem/musical-tone generators
PCD3311C; PCD3312C
8I2C-BUS INTERFACE
The I2C-bus is for two-way communication between different ICs or modules. It uses only two lines, a serial data line
(SDA) and a serial clock line (SCL), both of which are bi-directional. Both lines must be connected to a positive supply
via a pull-up resistor when connected to the output stages of a device. Data transfer may be initiated only when the bus
is not busy.
8.1
Bit transfer (see Fig.7)
One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the HIGH period
of the clock pulse as changes in the data line at this time will be interpreted as control signals.
8.2
Start and stop conditions (see Fig.8)
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW transition of the data line, while the
clock is HIGH is defined as the start condition (S). A LOW-to-HIGH transition of the data line while the clock is HIGH is
defined as the stop condition (P).
Fig.7 Bit transfer.
MBC621
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig.8 Start and stop conditions.
MBC622
SDA
SCL
P
STOP condition
SDA
SCL
S
START condition
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