Linear Technology 461A-A Manual de usuario

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 461A-A&B

COMPACT PCI BUS HOT SWAP CONTROLLER & SYSTEM BACKPLANE

LTC1644CGN

DESCRIPTION

Demonstration circuit 461A-Ais a circuit board

which demonstrates an application of the

LTC®1644CGN Compact PCI Hot Swap Con-

troller. DC 461A-Bsimulates the backplane of

a Compact PCI Bus system. Together the demo

boards demonstrate the Hot Swap controller

and how it allows a board to be safely inserted

or removed from an active (powered) Compact

PCI (CPCI) bus slot. In addition to demonstrat-

ing the Hot Swap capability, the DC461A also

demonstrates the ability of the LTC1644CGN to

monitor, control and protect the +5, +3.3, +12

and -12 volt power supplies, and bias the I/O

pins for minimal disruption during card insertion

and extraction.

External N-channel transistors control the

3.3V/5V supplies, while on-chip switches con-

trol the –12V and 12V supplies. The 3.3V and

5V supplies can be ramped up at a program-

mable rate. Electronic circuit breakers protect

all four supplies against overcurrent faults. The

PWRGD output indicates when all of the supply

voltages are within tolerance. The OFF/ON pin

is used to cycle the board power or reset the

circuit breaker. The PRECHARGE output can

be used to bias the bus I/O pins during card in-

sertion and extraction. PCI_RST# is combined

on-chip with HEALTHY# in order to generate

LOCAL_PCI_RST#.

Design files for this circuit board are available.

Call the LTC factory.

, LTC and LT are registered trademarks of Linear Technology Cor-

poration

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 461A-A&B

COMPACT PCI BUS HOT SWAP CONTROLLER & SYSTEM BACKPLANE

QUICK START PROCEDURE

Demonstration circuit 641A is easy to set up to evaluate the performance of the LTC1644CGN. The

DC641A-

board will be referred to as the backplane, and the DC641A-

will be referred to as the appli-

cation board.

Initial Setup

Place jumpers on the backplane board as follows:

JP1

JP2

JP3

GND

+5V

Connect the input +5, +3.3, +12 and -12 volt power supplies to the backplane board (See figure 1).

If you plan to test the circuit breaker and current limit features, make sure your power supplies are

capable of delivering at least 8 Amps at +5 volts, 10 Amps at +3.3Volts, 1 Amp at +12 Volts and

500mA at -12Volts.

POWER SUPPLY

3.3 VDC

+3.3V

GND

+5V

BD_SEL

I/O

PCI_RST#

HEALTHY#

GND

-12V

+12V

JP1

JP2

JP3

LTC1644CGN

12Vout GND Veeout 3Vout

GND

GNDI/ORESET#FAULT/

POWER SUPPLY

5 VDC

- +

POWER SUPPLY

12 VDC

- +

POWER SUPPLY

12 VDC

DC461A-A

BACKPLANE BOARD

DC461A-B

APPLICATION BOARD

5Vout

Figure 1- Power Supply Connections

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 461A-A&B

COMPACT PCI BUS HOT SWAP CONTROLLER & SYSTEM BACKPLANE

Initial verification

Plug the application board into the backplane

and power up the input power supplies. Ob-

serve the LEDs. The green “HEALTHY” LED (D4

on backplane) should be ON indicating that the

input power supplies are good, The red power

LEDs (D1, D2, D5, and D7 on the application

board) should also be ON indicating that the

+12V, -12V, +5V and +3.3V power supplies are

operating. Measure the application board power

supply output voltages to verify that the proper

voltages are present.

HEALTHY# Function

Under voltage problems with the input power

supplies are detected and indicated. Slowly re-

duce the voltage of one input power supply.

Observe that the green HEALTHY LED goes out

when the input voltage drops below its power-

good threshold. Slowly return the voltage to its

nominal value. Observe that the green

HEALTHY LED comes back ON when the input

power is once again in the allowable range. Re-

peat the process on the 3 remaining input power

supplies if desired.

Precharging I/O pins Function

Upon application board insertion, the application

board I/O pin is precharged to the desired level

before the application circuitry is powered up.

Upon PCI connector extraction the precharge

voltage level is maintained until after the appli-

cation circuitry is powered down. Monitor the

voltage level (1 Volt) at the I/O testpoint.

Slowly unplug the application board from the

backplane and observe that the I/O pin remains

charged after the application board has been

removed far enough to cause the power supplies

to cut off. Slowly plug the application board into

the backplane and observe that the I/O pin

charges to 1 Volt before application board has

been inserted far enough to enable the applica-

tion power supplies.

Over Current Protection Function

The LTC1644 provides overcurrent protection for

all of its output supplies. The overcurrent fault

will trip the electronic circuit breaker causing the

LTC 1644 to latch off. Apply an adjustable load

to one of the application power supplies. Slowly

increase the load while monitoring the load cur-

rent. When the application board’s current limit

for that power supply is exceeded, the electronic

circuit breaker will activate and all application

power supplies will be cut off. Observe that

when the electronic circuit breaker activates the

green HEALTHY LED turns OFF, all 4 of the red

power LEDs turn OFF, and the red FAULT LED

turns ON. Repeat the process on the 3 remain-

ing power supply outputs if desired.

Short Circuit Protection Function

Unplug the application board from the backplane

and apply a short across any of the power sup-

ply outputs on the application board, then plug

it back into the backplane. Observe that the

green HEALTHY LED is now OFF, and all 4 of the

red power LEDs are OFF, and the red FAULT LED

is ON. Unplug the application board from the

backplane and remove the short, then plug it

back into the backplane. The Green “HEALTHY”

LED and the red power LEDs should come ON

again, and the red FAULT LED should be OFF.

You can also apply the short while the applica-

tion board is plugged into the backplane and

powered up with the same results and no spark-

ing or popping. Repeat the process on the 3

remaining application power supply outputs if

desired.

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 461A-A&B

COMPACT PCI BUS HOT SWAP CONTROLLER & SYSTEM BACKPLANE

BD_SEL# Function

The application power supplies can be turned on

and off, and the latched fault condition cleared

by toggling the BD_SEL# signal. On the back-

plane board, set the BD_SEL (J1) to the N/C

(floating) position. The BD_SEL# signal is now

no longer grounded through the backplane so

the BD_SEL# is pulled high by circuitry on the

application board. Observe that when the

BD_SEL# testpoint goes low this enables the

application power supplies, and when BD_SEL#

goes high the application power supplies are dis-

abled (no LEDs ON). Force a fault condition by

momentarily applying a short to one of the ap-

plication board power supplies. Observe that the

application power supplies can be reset from a

faulted state (once the fault condition is re-

solved) by taking BD_SEL# hi then low again.

Fault/ Function

A fault response can be initiated by momentarily

taking the FAULT / testpoint low. The fault can

be cleared by taking BD_SEL# high then low

again.

PCI_RST# Function

When input power is good (HEALTHY LED is

ON), the PCI Reset signal from the backplane is

propagated to the Local PCI Reset line on the

application board. Alternately ground and allow

PCI_RST# on the backplane to be pulled high

while observing RESET# on the application

board board. RESET# follows PCI_RST#.

When input power is not good (HEALTHY LED is

OFF), RESET# is held low regardless of the state

of PCI_RST#. Reduce one of the input power

supplies until the HEALTHY LED turns OFF. Al-

ternately ground and allow PCI_RST# on the

backplane to be pulled high while observing

RESET# on the application board board.

RESET# stays low.

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 461A-A&B

COMPACT PCI BUS HOT SWAP CONTROLLER & SYSTEM BACKPLANE

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