參數(shù)資料
型號(hào)： ISL1219
廠商： Intersil Corporation
英文描述： Low Power RTC with Battery Backed SRAM and Event Detection(具有電池供電的SRAM和事件檢測(cè)功能的低功率RTC)
中文描述： 低功耗RTC與電池供電的SRAM和事件檢測(cè)（具有電池供電的SRAM的和事件檢測(cè)功能的低功率實(shí)時(shí)時(shí)鐘）
文件頁(yè)數(shù)： 18/25頁(yè)
文件大小： 373K
代理商： ISL1219
18
FN6314.1
August 14, 2006
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 14). On power up of the ISL1219, the SDA pin is in
the input mode.
All I
2
C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH. The ISL1219 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 14). A START condition is ignored during the
power-up sequence.
All I
2
C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
SCL is HIGH (See Figure 14). 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 15).
The ISL1219 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
ISL1219 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.
FIGURE 14. VALID DATA CHANGES, START, AND STOP CONDITIONS
FIGURE 15. ACKNOWLEDGE RESPONSE FROM RECEIVER
FIGURE 16. BYTE WRITE SEQUENCE
SDA
SCL
START
DATA
STABLE
DATA
CHANGE
STOP
DATA
STABLE
SDA OUTPUT FROM
TRANSMITTER
SDA OUTPUT FROM
RECEIVER
8
1
9
START
ACK
SCL FROM
MASTER
HIGH IMPEDANCE
HIGH IMPEDANCE
S
T
A
R
T
S
T
O
P
IDENTIFICATION
BYTE
DATA
BYTE
A
C
K
SIGNALS FROM
THE MASTER
SIGNALS FROM
THE ISL1219
A
C
K
1
0
0
1
1
A
C
K
WRITE
SIGNAL AT SDA
0 0 0 0
1 1 1
ADDRESS
BYTE
ISL1219
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