UM-B-074
DA1468x Range Extender Daughterboard
User Manual
Revision 1.1
17-Apr-2018
CFR0012
12 of 60
© 2018 Dialog Semiconductor
6
Bluetooth Low Energy SoC
The DA14680/681 is a flexible System-on-Chip for Bluetooth
®
low energy applications, combining an
application processor, memories, cryptography engine, power management unit, digital and analog
peripherals and a Bluetooth low energy MAC engine and radio transceiver. An overview of the basic
system is shown in
Figure 7
.
The DA14680/681 is based on an ARM
®
Cortex
®
-M0 CPU delivering up to 84 DMIPS and provides a
flexible memory architecture, enabling code execution from embedded memory (RAM, ROM) or non-
volatile memory (OTP or external Quad-SPI Flash). The DA14680 incorporates a QSPI Data Flash
memory in the package, whereas the DA14681 requires an external QSPI Data Flash.
The advanced power management unit of the DA14681 enables it to run from primary and secondary
batteries, as well as provide power to external devices. The on-chip charger and state-of-charge fuel
gauge allow the DA14680/681 to natively charge rechargeable batteries over USB.
An on-chip PLL enables on-the-fly tuning of the system clock between 16 MHz and 96 MHz to meet
high processing requirements. The system runs at 32 kHz LP clock during low power sleep modes or
it goes to clock less deep sleep mode to save power.
The DA14680/681 SoC power management subsystem consists of:
●
VBUS: Is the battery charger input as well as the USB bus voltage. A decoupling capacitor equal
or less than 4.7
F is placed close to VBUS pin.
●
VBAT1: An external battery is connected on this pin. A 1
F decoupling capacitor (C10) is
required close to the pin (0402 package, 6.3 V). Voltage range for VBAT1 is 1.7 V to 4.75 V.
●
VBAT2: Is the input of the SIMO DC-DC converter. It is shorted externally with VBAT1. A 1
F
decoupling capacitor (C8) is required next to the pin (0402 package, 6.3 V).
●
V33: Output voltage rail, 3.3 V. A decoupling ceramic capacitor of 4.7
F (C3), (0402 package,
6.3 V) is placed. V33 cannot be turned off.
●
SIMO DC-DC converter outputs are: V18, V18P, V12, V14. The inductor needed for DC-DC
operation is placed externally. A low DCR inductor (L1) of 470 nH, 0805 is connected on pins
LX/LY.
●
V18 and V18P: These voltage rails can deliver power to external devices, even when the system
is in sleep mode. Decoupling ceramic capacitors (C4, C5) of 10
F (0603 package, 16 V), are
placed as close as possible to the V18 and V18P pins. The current delivery capability of the V18
and V18P power rails is 75 mA in active mode, while it is 2 mA in sleep mode.
●
V12: Power rail supplies the digital core of the DA14680/681 and delivers up to 50 mA at 1.2 V
when in active mode. A 4.7
F decoupling capacitor (C6) is used (0402 package, 6.3 V).
●
V14: Power rail delivers up to 20 mA at 1.4 V and should not be used to supply external devices.
A 4.7
F decoupling capacitor (C7) is placed close to the V14 pin (0402 package, 6.3 V).
●
V14_RF: Input pin. It is shorted to V14 on the PCB layout. V14_RF powers the RF circuits via a
number of dedicated internal LDOs. A 4.7
F decoupling capacitor (C9) is placed as close to the
V14_RF pin as possible.
●
VDDIO: Flash interface supply voltage. It is connected to the same power rail as the Flash
memory. A 1
F decoupling capacitor (C1), is added (0402 package, 6.3 V).
The DA14680/681 radio transceiver characteristics are:
●
2.4 GHz CMOS transceiver with integrated balun
●
50
matched single wire antenna interface
●
Transmit output power in the range of 0 dBm to -4 dBm
●
-93 dBm BLE receiver sensitivity
●
Supply current at VBAT1 (3 V) for the RF part:
○
TX: 3.4 mA
○
RX: 3.7 mA
