RN171 datasheet(10/30 Pages) MICROCHIP

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RN171

DS70005171B-page 10

 2014-2016 Microchip Technology Inc.

2.8

Power Management

The module supports an ultra-low power sleep state,

from which it can wake for a range of detected reasons.

It transitions from asleep to CPU-active in 1.7 ms, and

CPU active to network connection in less than 35 ms

(typical). The RN171 also supports a keep-alive doze

state that provides an instant transition to a wake state.

2.8.1

FORCE AWAKE

The RN171 may be forced awake by asserting the

FORCE_AWAKE pin for at least 245 ms. If the

FORCE_AWAKE pin remains asserted, the module is

prevented from sleeping or dozing.

2.8.2

POWER SUPPLY

For supply voltages in the range of 3.0 to 3.7 volts, con-

nect the module using the power supply (no boost cir-

cuit). Refer to Figure 3-1 for an example.

2.8.3

BATTERY BOOST CONTROL

CIRCUIT

The RN171 includes a battery boost control circuitry for

battery voltages in the range of 1.8 to 3.3V. Five exter-

nal components as shown in Figure 3-2 make up the

battery boost circuit.

2.9

Module Reset

There are several ways to Reset the module:

• A Power-On Reset is generated automatically

when power is applied. This Reset is intended to

initialize the module when a new battery is con-

nected.

• Perform an external Power-On Reset by pulling

the RESET pin low.

• Perform a soft Power-On Reset using software

commands.

• A Reset can be triggered by a critical event, such

as a brownout, generated if the supply voltage

drops below the minimum operating voltage

2.9.1

BROWN-OUT DETECTION

The RN171 includes a brown-out detector that holds

the module in Reset if the battery voltage falls below

the minimum operating voltage.

WARNING

The battery boost circuit should not be operated with

battery supply voltages above 3.3 volts.

Note:

If the RN171 module is used in battery

applications, it is highly recommended

that a voltage supervisory device be

employed.

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