Detection Voltage Setting; Digital Offset Function - Epson RX8130 CE Applications Manual

RX8130CE

14.9. Detection voltage setting

Overview of detection voltage levels
V Reset /Reset-release voltage
DET1
V Backup switchover/recover voltage
DET2
V Full charge detection voltage
DET3
V VBAT low-voltage detection voltage
DET4

14.10. Digital offset function

With this function it is possible to increase or decrease the speed of the time counting and thus put an positive or
negative offset to the clock precision. The adjustment range for this offset correction is +192.310
-6
10 in steps of 3.0510
14.10.1.Digital offset register
Address[h]
0
• DTE="1" enables the digital offset function.
When the digital offset function is enabled, the digital offset register digitally offsets the sub-second clocks
according to the values set in the digital offset register. This correction of the second time register occurs every 10
seconds and the level of correction depends on the offset required. When outputting a 32.768kHz signal on
FOUT-pin , this function has no influence, since the oscillation frequency of the built-in crystal does not change by
using this function. In case of outputting a 1Hz or 1024Hz signal on FOUT, the offset correction will cause a certain
jitter on the clock signal.
Alarm function as well as the Fixed Cycle Timer function (if source clock lower than 4kHz is selected) are affected
by this function.
• In order to disable the digital offset function, set to DTE = "0". In this case the L1 to L7 are ignored.
• Below table shows the relationship of the L7L1 bit and the digital offset value
When the L7 bit = "0", the offset is positive (clock runs faster), when the L7 bit = "1", the offset is negative (the
clock runs slower).
L7 L6
0
0
0
0
0
1
1
1
1
The offset value are calculated on basis of a shift of the built-in crystal frequency.
Item
+V
+V
+V
+V
+V
+V
-6.
Function bit 7
Digital offset DTE
Digital offset bits
L5 L4
1 1 1
1 1 1
•
•
0 0 0
0 0 0
0 0 0
1 1 1
1 1 1
•
•
0 0 0
0 0 0
Symbol Detect voltage(Typ)
/ -V 2.8V / 2.75V
DET11 DET11
/ -V 2.7V / 2.65V
DET12 DET12
/ -V 1.35V / 1.30V
DET2 DET2
/ -V 3.02V / 2.97V
DET31 DET31
/ -V 2.92V / 2.87V
DET30 DET30
/ -V 3.08V / 3.03V
DET32 DET32
-V 2.4V
DET4
bit 6 bit 5 bit 4
L7 L6 L5
L3 L2 L1
1 1 1
1 1 0
0 1 0
0 0 1
0 0 0
1 1 1
1 1 0
0 0 1
0 0 0
Page34
setting
RSVSEL "0" (default)
RSVSEL "1"
BFVSEL "00b"(default)
BFVSEL "01b"
BFVSEL "10b"
-6
to -195.3
bit 3 bit 2 bit 1
L4 L3 L2
Offset value
(  10
-6
)
+192.26
+189.21
•
•
+6.10
+3.05
0.00
3.05
6.10
•
•
192.26
195.31
ETM50E-05

bit 0
L1