Epson RX8900SA/CE - 8.10. Backup and Recovery

RX8900 SA / CE
Page - 31 ETM45E-01
8.10. Backup and Recovery
* 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.
Item Symbol Condition Min. Typ. Max. Unit.
Detection voltage (1) VDET - 1.9 1.95 2.0 V
Detection voltage (2) VLOW - 1.16 - 1.60 V
Detection voltage (3) VDET3 - 2.3 2.4 2.5 V
Power supply rise time1 tR1 VDD=VSS to 2.5V 1 - 10 ms / V
Access wait time
(Initial power on)
tCL After VDD=2.5V
30 - - ms
Chip disable wait time tCD After stop condition 0 - - s / V
Power supply fall time tF VDD=2.5V to VSS 2 - - s / V
Power supply rise time2 tR2  VDD=VSS to 2.5V 15 - - s / V
Access wait time
( Normal power on)
tCU After VDD=2.5V
 0 - - s
VLOW
VSS
CE
tR1
tF
tR2
2.5V
Buck up operation
tCL
VIL VIL
VIL
tCD
tCU
VDET
*1 *1 *1 *1
*1:VDD Voltage detection
VBAT<VDET
VBAT<VLOW
VDD
VBAT