Linear Technology DC1605B Demo Manual page 13

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
V1 V2 V3 V4 V5 V6
LTC2936
GPI1
MR
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.
SYSTEM
RST
GPIO1
OV
GPIO2
ALERT
GPIO3
SDA
SCL
MARG
GPI2
DEMO MANUAL DC1605B
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
reset by changing the delay-on-release setting to ensure
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 410 ms 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 GPI1 pushbutton is pressed, a system
reset is asserted on GPIO1 and the ALERT is released if
the OV condition is removed.
dc1605bf
13