Kontron MSM800BEV - Manual (Page 41)

MSM800BEV / Detailed System Description
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6.3.2 For Stack-Through Applications
On each peripheral signal line that goes outside the computer case, place a serial inductivity followed by a grounded
capacitor of 100pF to 1000pF. In this case, no filtered connectors are needed. Place the filter directly under or behind
the onboard connector.
Serial Inductivity TDK HF50ACB321611-T 100MHz, 500mA, 1206 Case
Ground Capacitor Ceramic Capacitor with 1000pF
6.3.3 Power Supply
Use a current-compensated dual inductor on the 5V supply.
SIEMENS B82721-K2362-N1 with 3.6A, 0.4mH
6.4 Battery Lifetime
Note: The RTC back-up battery is only assembled onboard the MSM800SEV/BEV/XEV systems.
Battery Specifications
Lowest Temp.
-40°C Nominal Temp.
+20°C Highest Temp.
+85°C
Manufacturer pba
Type ER10280
Capacity versus Temp. 10uA 430mAh 400mAh 300mAh
Voltage versus Temp. 10uA 3.6V 3.6V Ca. 3.6V
Nominal Values 3.6V / 400mAh @ 0.5mA / -55°C...~+85°C
Information is taken from the datasheet of the battery manufacturer.
Product
Temperature
°C Battery Voltage
V
VCC (+5)
switched ON
µA VCC (+5V)
switched off
µA
Battery Current +25°C 3.6 < 1 < 4
Battery Lifetime +25°C > 5 years > 5 years
6.4.1 External Battery Assembly:
The external battery must be a lithium 3.6Volt with a capacity from 400-800mAh.
If the customer wants to connect an external battery (check for the appropriate connector in Chapter 5), some
precautions must be taken:
»
Do not use a rechargeable battery – the battery is prohibited from charging.
»
The RTC device defines a voltage level of 3-3.6V, so use an external battery within this range (inclusive of the
diode which is already assembled onboard).
Attention: For systems that already have an onboard battery (MSM800SEV/BEV/XEV): if an external battery is
to be connected, then the onboard battery must be removed first.