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9. Note of usage in power On / Off.
9.1. Instructions in the power on
9.1.1. Characteristic for the fluctuation of the power supply
tR1 is restrictions to validate power-on reset. When cannot keep this standard, power-on reset does not work
normally. It is necessary to initial setting by the software command.
Repeated ON/OFF of the power supply in short term, the power-on reset becomes unstable.
After power-OFF, keep a state of VDD=GND more than 60 seconds to validate power-on reset.
When it is impossible, please perform initial setting by the software command.
Power supply V
DD
VDD
V
CLK
GND
tR1
IF
Item
Power supply
rise time
access wait time
(Initial power on)
access wait time
( Normal power on)
A power-on reset procedure by the software command
1) Power- on
2) Wait: At least 40ms.
3) Dummy read.
4) Check VLF bit = "1"
5) Write 00h Address:Reg-1Fh
6) Write 80h Address:Reg-1Fh
7) Write D3h Address:Reg-60h
8) Write 03h Address:Reg-66h
9) Write 02h Address:Reg-6Bh
10) Write 01h Address:Reg-6Bh
END
A disappearance of the FOUT output when the voltage sharply went up and down.
For example, V
DD
The clock output from output pins disappears then during several milli-seconds when a sharp
voltage change happens.
Please check that there is not a problem by this characteristic on your system.
An reference example of a power up and down timing without affect to FOUT.
5.5V
Valid V
DD
for using FOUT.
1.6 V
tF
FOUT
tR
FOUT
RX8010SJ
ETM37E-07
Access is possible
tCL
Symbol
Condition
GND – VDD
tR1
tCL
tCU
1
voltage of the RX8010 is come and go between Main power and backup battery.
voltage range
tF
FOUT
Please make speed to descend of a power supply voltage loose than 4 ms/V.
Please make speed to rise of a power supply voltage loose than 4 ms/V.
Seiko Epson Corporation
Backup mode
Access is impossible
Min.
1
40
-
40
-
1 Dummy read
The location of the address is arbitrary.
Do not check ACK/NACK from RX8010.
tR
FOUT
9. Note of usage in power On / Off.
tCU
Typ.
Max.
-
100
-
-
-
-
Access is
possible
Unit
s / V
ms
ms
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INDEX
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