Datasheet

CC3100

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SWAS031D –JUNE 2013–REVISED FEBRUARY 2015

4.5 Brown-Out and Black-Out

The device enters a brown-out condition whenever the input voltage dips below V

BROWN

(see Figure 4-1 and

Figure 4-2). 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) cause a dip in the supply voltage, potentially

triggering a brown-out. The resistance includes the internal resistance of the battery, contact resistance of the

battery holder (4 contacts for a 2 x AA battery) and the wiring and PCB routing resistance.

Figure 4-1. Brown-Out and Black-Out Levels (1 of 2)

Figure 4-2. Brown-Out and Black-Out Levels (2 of 2)

In the brown-out condition, all sections of the device shut down except for the Hibernate module (including the

32-kHz RTC clock), which remains on. The current in this state can reach approximately 400 µA.

The black-out condition is equivalent to a hardware reset event in which all states within the device are lost.

Table 4-1 lists the brown-out and black-out voltage levels.

Table 4-1. Brown-Out and Black-out Voltage Levels

CONDITION VOLTAGE LEVEL UNIT

brownout

2.1 V

blackout

1.67 V

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