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C.1 Current Requirements
Remember to take the current draw of the various I/O cards into consideration when
selecting the power supply for your Smart Star control system.
Table C-1 lists the typical current consumption for the CPU Card and the I/O cards.
Table C-1. Current Consumption of I/O Cards Attached to Smart Star Backplane
Current Consumption
I/O Cards
+5 V Supply
+V_USER Supply
Digital I/O (SR9200 series)
A/D Converter (SR9300
series)
D/A Converter (SR9400
series)
Relay (SR9500 series)
CPU Card
65 mA
40 mA
10 mA
190 mA
up to 200 mA/output *
35 mA
75 mA
—
* Maximum current 2.0 A per I/O card, 7.0 A for Smart Star system
C.2 Batteries and External Battery Connections
An onboard 265 mA·h lithium coin cell on the CPU Card provides power to the real-time
clock and SRAM when external power is removed from the Smart Star control system.
This allows the CPU Card to continue to keep track of time and preserves the SRAM
memory contents while the power is off.
The drain on the battery is typically less than 20 μA when there is no external power
applied. The battery can last
265 mA·h
------------------------ = 3.0 years.
10 μA
The drain on the battery is typically less than 4 μA when external power is applied. The
battery can last for
265 mA·h
------------------------ = 7.5 years.
4 μA
Since the shelf life of the battery is 10 years, the battery can last for most of its shelf life
when external power is applied most of the time.
166
Smart Star (SR9000)
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