LTC2936 datasheet(13/20 Pages) LINER

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dc1605bf

DEMO MANUAL DC1605B

Demo BoarD use cases

USE CASE #3

Another common configuration is one that uses a GPIO

pin to drive a system reset. The LTC2936 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

LTC2936

SYSTEM

V1 V2 V3 V4 V5 V6

GPIO1

GPIO2

GPIO3

SDA

SCL

GPI2

GPI1

RST

ALERT

MARG

1. To program GPIO1 to system reset function, first

uncheck the hi_comp mapping of all V1-V6 channels

to GPIO1.

2. Configure GPI1 as a Manual Reset. Map GPI1 to GPIO1.

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.

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.

Whenconfiguredinthisway,GPIO1providesasystemreset

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-releasetimeto410mstoexperiencetheextended

reset firsthand. The UV condition indicator remains on

GPIO3. The OV condition is indicated as a latched ALERT

on GPIO2. When GPI1 pushbutton is pressed, a system

reset is asserted on GPIO1 and the ALERT is released if

the OV condition is removed.

LTC2936 Datasheet(PDF) 13 Page - Linear Technology

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