8.7 Brownout and Blackout Conditions
The module enters a brownout condition whenever the input voltage dips below V
BROWNOUT
(see
and
). This condition must be considered during design of the power supply routing, especially if operating
from a battery. High-current operations, such as a TX packet or any external activity (not necessarily related
directly to networking) can cause a drop in the supply voltage, potentially triggering a brownout. The resistance
includes the internal resistance of the battery, contact resistance of the battery holder (four contacts for a 2× AA
battery), and the wiring and PCB routing resistance.
Note
When the module is in HIBERNATE state, brownout is not detected. Only blackout is in effect during
HIBERNATE state.
Figure 8-4. Brownout and Blackout Levels (1 of 2)
Figure 8-5. Brownout and Blackout Levels (2 of 2)
In the brownout condition, all sections of the device shut down within the module except for the Hibernate block
(including the 32-kHz RTC clock), which remains on. The current in this state can reach approximately 400 µA.
The blackout condition is equivalent to a hardware reset event in which all states within the module are lost.
V
brownout
= 2.1 V and V
blackout
= 1.67 V
SWRS206E – MARCH 2017 – REVISED MAY 2021
32
Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: