
3.3.1 Energy Management Unit (EMU)
The Energy Management Unit manages transitions of energy modes in the device. Each energy mode defines which peripherals and
features are available and the amount of current the device consumes. The EMU can also be used to turn off the power to unused RAM
blocks, and it contains control registers for the dc-dc regulator and the Voltage Monitor (VMON). The VMON is used to monitor multiple
supply voltages. It has multiple channels which can be programmed individually by the user to determine if a sensed supply has fallen
below a chosen threshold.
3.3.2 DC-DC Converter
The DC-DC buck converter covers a wide range of load currents and provides up to 90% efficiency in energy modes EM0, EM1, EM2
and EM3. Patented RF noise mitigation allows operation of the DC-DC converter without degrading sensitivity of radio components.
Protection features include programmable current limiting, short-circuit protection, and dead-time protection. The DC-DC converter may
also enter bypass mode when the input voltage is too low for efficient operation. In bypass mode, the DC-DC input supply is internally
connected directly to its output through a low resistance switch. Bypass mode also supports in-rush current limiting to prevent input
supply voltage droops due to excessive output current transients.
3.3.3 Power Domains
The BGM13S has two peripheral power domains for operation in EM2 and EM3. If all of the peripherals in a peripheral power domain
are configured as unused, the power domain for that group will be powered off in the low-power mode, reducing the overall current
consumption of the device.
Table 3.2. Peripheral Power Subdomains
Peripheral Power Domain 1
Peripheral Power Domain 2
ACMP0
ACMP1
PCNT0
CSEN
ADC0
VDAC0
LETIMER0
LEUART0
LESENSE
I2C0
APORT
I2C1
-
IDAC
3.4 General Purpose Input/Output (GPIO)
BGM13S has up to 32 General Purpose Input/Output pins. Each GPIO pin can be individually configured as either an output or input.
More advanced configurations including open-drain, open-source, and glitch-filtering can be configured for each individual GPIO pin.
The GPIO pins can be overridden by peripheral connections, like SPI communication. Each peripheral connection can be routed to sev-
eral GPIO pins on the device. The input value of a GPIO pin can be routed through the Peripheral Reflex System to other peripherals.
The GPIO subsystem supports asynchronous external pin interrupts.
3.5 Clocking
3.5.1 Clock Management Unit (CMU)
The Clock Management Unit controls oscillators and clocks in the BGM13S. Individual enabling and disabling of clocks to all peripher-
als is performed by the CMU. The CMU also controls enabling and configuration of the oscillators. A high degree of flexibility allows
software to optimize energy consumption in any specific application by minimizing power dissipation in unused peripherals and oscilla-
tors.
BGM13S Blue Gecko
Bluetooth
®
SiP Module Data Sheet
System Overview
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