S-35390A-J8T1G Seiko Instruments, S-35390A-J8T1G Datasheet - Page 35

• Manufacturer Part Number: S-35390A-J8T1G
• Description: IC RTC I2C 2-WIRE 8-SOP
• Manufacturer: Seiko Instruments
• Type: Clock/Calendarr

Specifications of S-35390A-J8T1G

• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Other names: 728-1006-2

Rev.3.0
master device)
Reset After Communication Interruption
In case of communication interruption in the S-35390A, for example, during communication the power supply voltage
drops so that only the master device is reset; the S-35390A does not operate the next procedure because the internal
circuit keeps the state prior to interruption. The S-35390A does not have a reset pin so that users usually reset its internal
circuit by inputting a stop condition. However, if the SDA line is outputting “L” (during output of acknowledgment signal or
Read), the S-35390A does not accept a stop condition from the master device. In this case, users are necessary to finish
acknowledgment output or Read the SDA line. Figure 45 shows how to reset. First, input a start condition from the master
device (The S-35390A cannot detect a start condition because the SDA line in the S-35390A is outputting “L”). Next, input
a clock pulse equivalent to 7-byte data access (63-clock) from the SCL line. During this, release the SDA line for the
master device. By this procedure, SDA I/O before interruption is finished, so that the SDA line in the S-35390A is released.
After that, inputting a stop condition resets the internal circuit so that restore the regular communication. This reset
procedure is recommended to perform at initialization of the system after rising the master device’s power supply voltage.
(Output from
(Output from
S-35390A)
_00
SDA
SDA
SDA
SCL
condition
Start
“L”
“L”
1
Figure 45 How to Reset
Seiko Instruments Inc.
Clocks equivalent to 7-byte data access
2
“L” or High-Z
“L” or High-Z
8
9
2-WIRE REAL-TIME CLOCK
62
63
High-Z
condition
Stop
S-35390A
35