參數(shù)資料
型號(hào)： S-35392A-I8T1U
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： HALOGEN FREE AND LEAD FREE, SNT-8
文件頁(yè)數(shù)： 21/47頁(yè)
文件大?。?/td> 419K
代理商： S-35392A-I8T1U
2-WIRE REAL-TIME CLOCK
S-35392A
Rev.2.0_00
Seiko Instruments Inc.
28
Serial Interface
The S-35392A receives various commands via I
2C-bus serial interface to Read/Write data. Regarding transmission is as
follows.
1.
Start condition
A start condition is when the SDA line changes “H” to “L” when the SCL line is in “H”, so that the access starts.
2.
Stop condition
A stop condition is when the SDA line changes “L” to “H” when the SCL line is in “H”, and the access stops, so that the
S-35392A gets standby.
Start condition
Stop condition
tSU.STA
tHD.STA
tSU.STO
SCL
SDA
Figure 28
Start/Stop Conditions
3.
Data transfer and acknowledgment signal
Data transmission is performed for every 1-byte, after detecting a start condition. Transmit data while the SCL line is in
“L”, and be careful of spec of tSU.DAT and tHD. DAT when changing the SDA line. If the SDA line changes while the SCL
line is in “H”, the data will be recognized as start/stop condition in spite of data transmission. Note that by this case, the
access will be interrupted.
During data transmission, every moment receiving 1-byte data, the devices which work for receiving data send an
acknowledgment signal back. For example, as seen in Figure 29, in case that the S-35392A is the device working for
receiving data and the master device is the one working for sending data; when the 8-bit clock pulse falls, the master
device releases the SDA line. After that, the S-35392A sends an acknowledgment signal back, and set the SDA line to
“L” at the 9-bit clock pulse. The S-35392A does not output an acknowledgment signal is that the access is not being
done regularly.
1
8
9
Output acknowledgment
(“L” active)
tPD
Start condition
SCL
(Input from
S-35392A)
SDA
(Output from
master device)
SDA
(Output from
S-35392A)
SDA is released
tSU.DAT
tHD.DAT
High-Z
Figure 29
Output Timing of Acknowledgment Signal
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