S-35390A-J8T1G Seiko Instruments, S-35390A-J8T1G Datasheet - Page 17

• 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
Power-on Detection Circuit and Register Status
The power-on detection circuit operates by power-on the S-35390A, as a result each register is cleared; each register is
set as follows.
“1” is set in the POC flag (B0 in the status register 1) to indicate that power has been applied. To correct the oscillation
frequency, the status register 2 goes in the mode the output of user-set frequency, so that 1 Hz clock pulse is output from
the
the output of user-set frequency mode is cleared. (Refer to “ Register Status After Initialization”.)
For the regular operation of power-on detection circuit, as seen in Figure 20, the period to power-up the S-35390A is that
the voltage reaches 1.3 V within 10 ms after setting the IC’s power supply voltage at 0 V. When the power-on detection
circuit is not working normally is; the POC flag (B0 in the status register) is not in “1”, or 1 Hz is not output from the
pin. In this case, power-on the S-35390A once again because the internal data may be in the indefinite status.
Do not transmit data immediately after power-on at least 0.5 sec because the power-on detection circuit is operating.
INT pin. When “1” is set in the POC flag, be sure to initialize. The POC flag is set to “0” due to initialization so that
Real-time data register :
Status register 1 :
Status register 2 :
INT1 register :
INT2 register :
Clock correction register :
Free register :
_00
1
*1. 0 V indicates that there are no potential differences between the VDD
pin and VSS pin of the S-35390A.
Figure 20 How to Raise the Power Supply Voltage
00 (Y), 01 (M), 01 (D), 0 (day of the week), 00 (H), 00 (M), 00 (S)
“01h”
“80h”
“80h”
“00h”
“00h”
“00h”
Seiko Instruments Inc.
Within 10 ms
1.3 V
0 V
*1
2-WIRE REAL-TIME CLOCK
S-35390A
INT
17
1