STLBC01 datasheet(20/40 Pages) STMICROELECTRONICS

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Functional description

STLBC01

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DocID022984 Rev 2

5.3.6

BLE sleep (only for SPI transport layer)

BLE sleep mode is a special low power mode available only when the SPI transport layer is

used. This mode can be enabled by the HCI command.

The STBLC01 offers two possible configurations for this mode: one employing the Xtal

oscillator and another using the RC oscillator. When the Xtal oscillator is used, the high

precision of the Xtal allows the STBLC01 to act as a master, slave, advertiser or scanner

device. When the STBLC01 is a slave, advertiser or scanner device, the RC oscillator can

be chosen, and the power consumption can be significantly reduced because the Xtreme

power mode is used in that case.

The STBLC01 controls automatically the transitions between BLE Active and this mode; the

host cannot influence them directly.

The use of the RC oscillator can be enabled using the HCI command

STBLC_POWER_MODE_CONFIGURATION.

In this configuration, the RF core is turned off and the HCI system is active and able to

receive any command.

•

If UART has been chosen as transport layer, only the Xtal oscillator can be selected.

•

If the transport layer is SPI, the Xtal oscillator or the RC oscillator can be selected.

5.4

STBLC01 reset structure

The STBLC01 has the following reset sources:

Power On Reset (POR). This occurs after each power-up of the STBLC01. Once the

boot-up procedure described in

Section 5.1 is completed, an

STBLC_POWER_MODE_IDLE event is reported to the host, indicating that the

STBLC01 has entered Idle mode. During POR, the RST pad is pulled to logic 0.

RST pad. The host can reset the STBLC01 by pulling up the RST pin for at least 5 ms.

In this situation the STBLC01 reboots the firmware and an event

STBLC_POWER_MODE_IDLE is sent as soon as the STBLC01 has entered Idle

mode. The RST pad is pulled to logic 0 during POR.

HCI reset. Sending the standard BT command HCI_RESET, the host can reset the

BLE functions of the STBLC01 as described in [

2].

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