Texas Instruments CC2650DK Benutzerhandbuch
Functional Overview
1.3.13.1.3 Digital Core Supply
The digital core of the CC26xx is supplied by a 1.28-V regulator connected to VDDR. The output of this
regulator requires an external decoupling capacitor for proper operation; this capacitor must be connected
to the DCOUPL pin.
regulator requires an external decoupling capacitor for proper operation; this capacitor must be connected
to the DCOUPL pin.
NOTE:
The DCOUPL pin cannot be used to supply external circuitry.
When the system is in power down, a small low-power regulator (micro LDO) with limited current capacity
will supply the digital domain to ensure enabled modules still have power.
will supply the digital domain to ensure enabled modules still have power.
1.3.13.1.4 Other Internal Supplies
Several other modules in the device (such as the frequency synthesizer, RF power amplifier, and so forth)
have separate internal regulators running at either 1.4-V (analog modules) or 1.28-V (digital modules).
These regulators are powered up or down automatically by firmware when needed.
have separate internal regulators running at either 1.4-V (analog modules) or 1.28-V (digital modules).
These regulators are powered up or down automatically by firmware when needed.
1.3.13.2 DC-DC Converter
The on-chip buck-mode DC-DC converter provides a simple way to reduce the power consumption of the
device. The DC-DC converter is integrated into the supply system and handles bias and clocks
automatically through the system controller.
device. The DC-DC converter is integrated into the supply system and handles bias and clocks
automatically through the system controller.
The DC-DC converter is controlled through the [AON_SYSCTL:PWRCTL] register.
To enable the DC-DC converter when the system is active, the [AON_SYSCTL:PWRCTL:DCDC_ACTIVE]
bit must be set. The DC-DC converter can also be used in a special operation mode as power source
when the device is in power down to reduce sleep current. This is configured through the
[AON_SYSCTL:PWRCTL:DCDC_EN] bit.
bit must be set. The DC-DC converter can also be used in a special operation mode as power source
when the device is in power down to reduce sleep current. This is configured through the
[AON_SYSCTL:PWRCTL:DCDC_EN] bit.
1.3.13.3 External Regulator Mode (1.65-V to 1.95-V Supply Voltage)
Some devices in the CC26xx family support an external regulator mode where the VDDS/VDDR supplies
are tied together and supplied by a voltage in the range of 1.65-V to 1.95-V.
are tied together and supplied by a voltage in the range of 1.65-V to 1.95-V.
This mode is enabled at boot by grounding VDDS_DCDC. All VDDS pins and VDDR pins must be
connected together, while DCDC_SW must be left floating or grounded. When the device is used in this
mode, neither the global LDO nor the DC-DC converter will be enabled.
connected together, while DCDC_SW must be left floating or grounded. When the device is used in this
mode, neither the global LDO nor the DC-DC converter will be enabled.
It is possible to check that the device has booted properly into external regulator mode by reading the
[AON_SYSCTL:PWRCTL:EXT_REG_MODE] register field.
[AON_SYSCTL:PWRCTL:EXT_REG_MODE] register field.
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SWCU117A – February 2015 – Revised March 2015
Architectural Overview
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