BLUENRG-1 datasheet(17/173 Pages) STMICROELECTRONICS

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BlueNRG-1

Functional details

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3.4.1.2

Active state

In this state:



The high frequency runs on the accurate clock (16 MHz ±50 ppm) provided by the

external XO. The internal fast clock RO oscillator is switched off.

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

Section 8.5.3: "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.

3.4.2

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-1 states is provided below.

Table 3: Relationship between BlueNRG-1 states and functional blocks

RESET

STANDBY

SLEEP

Preactive

Active

LOCKRX/

LOCK TX

LDO_SOFT_1V2 or

LDO_SOFT_0V9

OFF

LDO_STRONG_1V2

OFF

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