Mark Thoren Introduction Swapcontroller essential system which bo

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Easy Auxiliary Control Functions Swap Cards Design Note
Mark Thoren
Introduction Swapcontroller essential system which boards inserted into live backplane. controller must gently ramp supply voltage current into card's bypass capacitors, thus minimizing disturbances backplane other cards. Likewise, must disconnect faulty card from backplane draws much current. controller also monitors undervoltage overvoltage conditions backplane supply, ensuring reliable operation card's circuitry. LTC4215-1 takes obvious next step integrates three general purpose (GPIO) lines accurate into Swap controller provide quantitative information board voltage current. Upgrading LTC4215-1 analogous replacing car's venerable "Check Engine" light with modern dashboard information display. Additional Control There many functions card that considered part "power gateway," apart from actual function board (telecommunications, data acquisition, etc.) These include sequencing power supplies, providing supply status information, monitoring pushbuttons, etc. LTC4215-1 GPIO pins well suited these functions. Tying high turns pass after 100ms power-on delay. Grounding enables software control FET. state GPIO pins before enabling FET, ensuring known state when downstream power enabled. GPIO1 defaults high power sink 5mA. GPIO2 defaults high sink 3mA. GPIO3 defaults sink 100µA.
LTC, Lare registered trademarks Linear Technology Corporation. Swap trademark Linear Technology. other trademarks property their respective owners.
133k 0.1µF 4.75k 13.7k ALERT
0.004
Si7880DP 22.1k 22nF 3.0k
COUT
12V/5A OUTPUT
SDAI SDA0 GPIO2
SENSE GATE
SOURCE GPIO1 GPIO3 ADIN CTIMER
4.7k
LTC4215GN
INTVCC ADR0 ADR1 TIMER BACKPLANE PLUG-IN CARD 0.1µF
68nF 768k 4.7µF 249k
LT1761-SD
SHDN
Figure LTC4215-1 Typical Card Resident Application
08/07/421
instance, Figure shows application that monitors "request remove card" pushbutton lights "okay remove" when card ready removal. This permits graceful shutdown card. example, transfer collected data before shutting down that lost. GPIO1, which defaults high, controls LED. GPIO3 reprogrammed input that monitors state pushbutton. GPIO2 controls operation onboard regulator. This important mixed signal circuits, where analog circuitry need powered before digital signals enabled. Figure uses GPIO control LTC4210-1 Swap controller, which turn controls 3.3V rail. Once again, this useful sequencing supplies eliminate need additional sequencing circuits.
3.3V FROM BACKPLANE 0.1µF 0.01µF CTIMER 0.22µF
Figure uses three GPIO pins light eight LEDs using 74HC138 decoder. These indicate system status power consumption. Other possible functions include issuing microprocessor reset, adding additional channels using GPIO pins control multiplexer, interfacing with advanced power supply sequencer such LTC2928. Conclusion LTC4215-1 smart power gateway Swap circuits. provides fault isolation, closely monitors health power path, provides unprecedented level control over inrush current profile. three general purpose pins spare channel allow further control power path system initialization/ shutdown related functions.
RSENSE 0.007 Si4410DY VOUT 3.3V/6A
SENSE GATE LTC4210-1CS6 TIMER/OFF 0.01µF
CLOAD 10µF
GPIOX
Figure Controlling LTC4210-1
3.3V
GPIO1 GPIO2 GPIO3
74HC138
Figure 3.Controlling Eight Status LEDs
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applications help, call (408) 432-1900, Ext. 2360
dn421 0807 451K PRINTED
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900
FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2007

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