Publication No. HRMCR11 Rev. B.0
About This Manual 57
Onboard Lithium Battery
•
With an onboard hard disk drive please add following values to the +5 V
c
ur
rent
:
•
During power up 0.9 A max.
•
hi an idle condition 0. 13 A typical.
•
During rea
d/
write access 0.42 A typical
Values are taken from the Fujitsu MHT 2060 AT datasheet
•
With an onboard compact flash drive please add 0.1 A to the +5 V current
•
Co1u1ectors P1680, P1681 and P4200 provide fused VCC voltage (+5 V)
.
The total current drawn from this source may not exceed LO A
Not powered by the system
BR1225 (50 mAh
),
estimated life time depending on temperature and power
status. The diagram below shows discharge if board is not powered from the
system,
i
.
e
.
if battery has to supply all current for the clock circuits
.
1
6
,
0
1
4
,
0
1
2
,
0
1
0
,
0
8
.
0
6
.
0
4
.
0
--
2
.
0
0
.
0
25
35
../
--
--
------
-
-/
-
-
V
-
45
50
Temp (0C)
55
,.
V
/
/
,
v-
//
65
75
Figu!'e 18: Battery current versus tempe!'atu!'e
At tempera.nues !owe� than +25 °C use the value at 25
°
C
.
Actually power
usage is lower, which means longer operational lifetime for the battery
.
All values were taken at 40 % RH (relative humidity).
Using the values of the diagram above
(
Battery ctureut versus temperature)
lifetime of the battery can be derived from the diagram below (Battery current
versus tin1e
)
.
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