8.8 Brownout and Blackout Conditions
The device enters a brownout condition when 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 condition. 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 device is in the Hibernate state, brownout is not detected; only blackout is in effect during
the 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 CC3135MOD (including the 32-kHz RTC) shut down except for the
Hibernate module, 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 device are lost.
SWRS225D – FEBRUARY 2019 – REVISED MAY 2021
22
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