BLUENRG-2 datasheet(153/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

DocID030675 Rev 2

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The RF transceiver requires very few external discrete components. It provides 96 dB link

budgets with excellent link reliability, keeping the maximum peak current below 15 mA.

In transmit mode, the power amplifier (PA) drives the signal generated by the frequency

synthesizer out to the antenna terminal through a very simple external network. The power

delivered as well as the harmonic content depends on the external impedance seen by the

PA.

3.22.1

Radio operating modes

Several operating modes are defined for the BlueNRG-2 radio:



Reset mode



Sleep mode



Active mode



Radio mode



RX mode



TX mode

In Reset mode, the BlueNRG-2 is in ultra-low power consumption: all voltage regulators,

clocks and the RF interface are not powered. The BlueNRG-2 enters Reset mode by

asserting the external Reset signal. As soon as it is de-asserted, the device follows the

normal activation sequence to transit to active mode.

In sleep mode either the low speed crystal oscillator or the low speed ring oscillator are

running, whereas the high speed oscillators are powered down as well as the RF interface.

The state of the BlueNRG-2 is retained and the content of the RAM is preserved.

While in sleep mode, the BlueNRG-2 waits until an internal timer expires and then it goes

into active mode.

In active mode the BlueNRG-2 is fully operational: all interfaces, including RF, are active as

well as all internal power supplies together with the high speed frequency oscillator. The

MCU core is also running.

Radio mode differs from active mode as also the RF transceiver is active and it is capable

of either transmitting or receiving.

3.23

Pre-programmed bootloader

BlueNRG-2 device has a pre-programmed bootloader supporting UART protocol with

automatic baudrate detection. Main features of the embedded bootloader are:



Auto baudrate detection up to 460 kbps



Flash mass erase, section erase



Flash programming



Flash readout protection enable/disable

The pre-programmed bootloader is an application which is stored on the BlueNRG-2

internal ROM at manufacturing time by STMicroelectronics. This application allows

upgrading the device Flash with a user application using a serial communication channel

(UART).

Bootloader is activated by hardware by forcing IO7 high during power-up or hardware

Reset, otherwise, application residing in Flash will be launched.

The customer application must ensure that IO7 is forced low during power up.

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