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BLUENRG-LP Datasheet(PDF) 12 Page - STMicroelectronics

No. de pieza BLUENRG-LP
Descripción Electrónicos  Programmable Bluetooth® Low Energy wireless SoC
PDF  72 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

BLUENRG-LP Datasheet(HTML) 12 Page - STMicroelectronics

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1.6.4
Power supply supervisor
The BlueNRG-LP device embeds several power voltage monitoring:
•
Power-on-reset (POR): during the power-on, the device remains in reset mode if VDDIO is below a VPOR
threshold (typically 1.65 V)
•
Power-down-reset (PDR): during power-down, the PDR puts the device under reset when the supply voltage
(VDD) drops below the VPDR threshold (around 20 mV below VPOR). The PDR feature is always enabled
•
Power voltage detector (PVD): can be used to monitor the VDDIO (against a programmed threshold) or an
external analog input signal. When the feature is enabled and the PVD measures a voltage below the
comparator, an interrupt is generated (if unmasked)
1.7
Operating modes
Several operating modes are defined for the BlueNRG-LP:
•
RUN mode
•
DEEPSTOP mode
•
SHUTDOWN mode
Table 2. Relationship between the low power modes and functional blocks
Mode
SHUTDOWN
DEEPSTOP
IDLE
RUN
CPU
OFF
OFF
OFF
ON
Flash
OFF
OFF
ON
ON
RAM
OFF
ON/OFF granularity 16 kB
ON/OFF
ON/OFF
Radio
OFF
OFF
ON/OFF
ON/OFF
Supply system
OFF
OFF
ON ( DC-DC ON/OFF)
ON ( DC-DC ON/OFF)
Register retention
OFF
ON
ON
ON
HS clock
OFF
OFF
ON
ON
LS clock
OFF
ON/OFF
ON
ON
Peripherals
OFF
OFF
ON/OFF
ON/OFF
Wake-on RTC
OFF
ON/OFF
ON/OFF
NA
Wake-on GPIOs
OFF
ON/OFF
ON/OFF
NA
Wake-on reset pin
ON
ON
ON
NA
1.7.1
RUN mode
In RUN mode the BlueNRG-LP is fully operational:
•
All interfaces are active
•
The internal power supplies are active
•
The system clock and the bus clock are running
•
The CPU core and the radio can be used
The power consumption may be reduced by gating the clock of the unused peripherals.
1.7.2
DEEPSTOP mode
The DEEPSTOP is the only low power mode of the BlueNRG-LP allowing the restart from a saved context
environment and the application at wake-up to go on running.
The conditions to enter the DEEPSTOP mode are:
•
The radio is sleeping (no radio activity)
•
The CPU is sleeping (WFI with SLEEPDEEP bit activated)
•
No unmasked wake-up sources are active
•
The low power mode selection (LPMS) bit of the power controller unit is 0 (default)
BlueNRG-LP
Operating modes
DS13282 - Rev 2
page 12/72



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