BLUENRG-2 datasheet(18/190 Pages) STMICROELECTRONICS

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Functional details

BlueNRG-2

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DocID030675 Rev 2

If the external XO is at 32 MHz, some specific programming are needed, see

Section 3.5.3: "Switching to external clock".

3.4.1.3

Standby state

In this state:



Only the digital power supplies necessary to keep the RAM in retention are used.

The wake-up from this low power state is driven by the following sources:



IO9



IO10



IO11



IO12



IO13

If they have been programmed as wake-up source in the system controller registers.

3.4.1.4

Sleep state

In this state:



Only the digital power supplies necessary to keep the RAM in retention are used.



The low frequency oscillator is switched on.

The wake-up from this low power state is driven by the following sources:



IO9



IO10



IO11



IO12



IO13

If they have been programmed as wake-up source in the system controller registers and

from the internal timers of the BLE radio.

3.4.1.5

IO wake up sources

The IOs programmed to be wake up sources need an external drive according to the

selected level sensitivity.

If the wake up level is high level, a pull down drive should be used. If the wake up level is

low level, a pull up drive should be used.

If no external drive is applied, IO9, IO10 and IO11 are only sensitive to low level as they

have an internal pull up (activated by default). IO12 and IO13 do not have an internal pull

and therefore require an external drive.

3.4.1.6

Wake up time

The wake up time is typically 200 µs at 3.0 V and a temperature of 25´°C.

3.4.2

Power saving strategy

The application power saving strategy is based on clock stopping, dynamic clock gating,

digital power supply switch off and analog current consumption minimization.

A summary of functional blocks versus the BlueNRG-2 states is provided below.

BLUENRG-2 Datasheet(PDF) 18 Page - STMicroelectronics

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