參數(shù)資料
型號(hào)： ISL12082IB8Z
廠商： Intersil
文件頁(yè)數(shù)： 13/26頁(yè)
文件大?。?/td> 0K
描述： IC RTC I2C LO-POWER 8-SOIC
標(biāo)準(zhǔn)包裝： 980
類型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，閏年，監(jiān)視計(jì)時(shí)器
時(shí)間格式： HH:MM:SS:hh（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 2.7 V ~ 5.5 V
電壓 - 電源，電池： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOIC
包裝： 管件
20
FN6731.3
November 24, 2008
Protocol Conventions
Data states on the SDA line can change only during SCL
LOW periods. SDA state changes during SCL HIGH are
reserved for indicating START and STOP conditions (see
Figure 12). On power-up of the ISL12082, the SDA pin is in
the input mode.
All I2C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH. The ISL12082 continuously monitors the SDA
and SCL lines for the START condition and does not
respond to any command until this condition is met
(see Figure 12). A START condition is ignored during the
power-up sequence.
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
SCL is HIGH (see Figure 13). A STOP condition at the end
of a read operation or at the end of a write operation to
memory only places the device in its standby mode.
An acknowledge (ACK) is a software convention used to
indicate a successful data transfer. The transmitting device,
either master or slave, releases the SDA bus after
transmitting eight bits. During the ninth clock cycle, the
receiver pulls the SDA line LOW to acknowledge the
reception of the eight bits of data (see Figure 14).
The ISL12082 responds with an ACK after recognition of a
START condition followed by a valid Identification Byte, and
once again after successful receipt of an Address Byte. The
ISL12082 also responds with an ACK after receiving a Data
Byte of a write operation. The master must respond with an
ACK after receiving a Data Byte of a read operation.
SDA
SCL
START
DATA
STOP
STABLE
CHANGE
DATA
STABLE
FIGURE 12. VALID DATA CHANGES, START, AND STOP CONDITIONS
SDA OUTPUT FROM
TRANSMITTER
SDA OUTPUT FROM
RECEIVER
8
1
9
START
ACK
SCL FROM
MASTER
HIGH IMPEDANCE
FIGURE 13. ACKNOWLEDGE RESPONSE FROM RECEIVER
S
T
A
R
T
S
T
O
P
IDENTIFICATION
BYTE
FIRST DATA
BYTE
A
C
K
SIGNALS FROM
THE MASTER
SIGNALS FROM
THE ISL12082
A
C
K
10
0
11
A
C
K
WRITE
SIGNAL AT SDA
00 00
111
ADDRESS
BYTE
A
C
K
LAST DATA
BYTE
A
C
K
FIGURE 14. SEQUENTIAL BYTE WRITE SEQUENCE
ISL12082
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