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dc1633bf

DEMO MANUAL DC1633B

Demo BoarD use cases

USE CASE #3

Another common configuration is one that uses a GPIO

pin to drive a system reset. The LTC2933 data sheet shows

this feature throughout. The other two GPIOs are config-

ured as previously shown, OV and ALERT. Additionally a

manual reset pushbutton (GPI1) asserts the system reset.

GPIO1 → RST (system reset)

GPIO2 → OV

GPIO3 → ALERT

GPI1 → MR pushbutton

3. Configure GPIO1 as active-low with weak pull-up. To

update the changes made in steps 1-3, click the Write

All Registers (PC->RAM) icon.

1.ToprogramGPIO1tosystemresetfunction,firstuncheck

the mapping of all V1-V6 channels to GPIO1.

4. You can optionally extend the low time of the system

resetbychangingthedelay-on-releasesettingtoensure

a clean release of reset. This provides a time-based

debounce of the switch.

When configured in this way, GPIO1 provides a system

reset for the host processor and GPI1 can drive a system

reset (GPIO1) with a push of a button. You may set the

GPIO1 delay-on-release time to 410ms to experience

the extended reset firsthand. The UV condition indicator

remains on GPIO3. The OV condition is indicated as a

latched ALERT on GPIO2. When the GPI1 pushbutton

is pressed, a system reset is asserted on GPIO1 and the

ALERT is released if the OV condition is removed.

2. Configure GPI1 as a Manual Reset. Map GPI1 to

GPIO1.

LTC2933

SYSTEM

V1 V2 V3 V4 V5 V6

GPIO1

GPIO2

GPIO3

SDA

SCL

GPI2

GPI1

RST

ALERT

MARG

LTC2933 Datasheet(PDF) 13 Page - Linear Technology

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