Current Drain Of Digital Electronics - Mallinckrodt NELLCOR NPB-4000 Service Manual

14.19 CURRENT DRAIN OF DIGITAL ELECTRONICS

The worst case current drain has been determined by using the maximum
numbers in the data sheets of the devices. Typically the devices operate
significantly lower.
386EX
16M DRAM
8M FLASH
LCD CNTLR
DUART
RS232 XCVR
256K FLASH
RTC
40mhz osc
subtotal
misc. logic
grand total
power = 3.3 volts x 645 mA = 2.12 Watts worst case
Typical numbers are 3.3 volts at 300 mA = 0.99 Watts.
Section 14: Main Color Board Digital Theory of Operation
130 mA
170max2=340 mA
20 mA
30 mA
3 mA
5 mA
15 mA
15 mA
9 mA
567 mA
78 mA
645 mA
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