DA14583 datasheet(13/148 Pages) DIALOG

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3.8.1 Clocks

The Digital Controlled Xtal Oscillator (DXCO) is a

Pierce configured type of oscillator designed for low

power consumption and high stability. There are two

such crystal oscillators in the system, one at 16 MHz

(XTAL16M) and a second at 32.768 kHz (XTAL32K).

The 32.768 kHz oscillator has no trimming capabilities

and is used as the clock of the Extended Sleep mode.

The 16 MHz oscillator can be trimmed.

The principle schematic of the two oscillators is shown

in Figure 5 below. No external components to the

DA14583 are required other than the crystal itself. If

the crystal has a case connection, it is advised to con-

nect the case to ground.

There are 3 RC oscillators in the DA14583: one provid-

ing 16 MHz (RC16M), one providing 32 kHz (RC32K)

and one providing a frequency in the range of 10.5 kHz

(RCX).

3.8.2 Reset

The DA14583 comprises an RST pad which is active

high. It contains an RC filter for spikes suppression

with 400 k and 2.8 pF for the resistor and the capaci-

tor respectively. It also contains a 25 k pull-down

resistor. This pad should be connected to ground if not

needed by the application. The typical latency of the

RST pad is in the range of 2 s.

3.9 POWER MANAGEMENT

The DA14583 has a complete power management

function integrated with a Buck DC-DC converter and

separate LDOs for the different power domains of the

system.

Features

• On-chip LDOs, without external capacitors

• Synchronous DC-DC converter configured as Buck

(step-down) converter for increased efficiency when

running from a Lithium coin-cell or 2 Alkaline batter-

ies down to 2.35 V.

• Battery voltage measurement ADC (multiplexed

input from general purpose ADC)

• Use of small external components (2.2 H inductor

and 1F capacitor)

The Power Block contains a DC-DC converter operat-

ing as a Buck (step-down) converter. The converter

provides power to four LDO groups in the system:

1. LDO RET: This is the LDO providing power to the

Retention domain (PD_AON). It powers the Retention

RAMs and the digital part which is always on.

2. LDO OTP: This is the LDO powering the OTP macro

cell. This is the reason for using the step-up DC-DC

converter when running from an Alkaline battery.

3. LDO SYS: This is the LDO providing the system with

the actual VDD power required for the digital part to

operate.

4. LDO (various): This a group of LDOs used for the

elaborate control of the powering up/down of the

Radio, the GP ADC and the XTAL16M oscillator.

The Power Block of the DA14583 only supports the

use of Lithium coin cells (2.35 V to 3.3 V) as external

battery. The connection diagram is shown in Figure 6.

Figure 5 Crystal oscillator circuits

clock16MHz

16 MHz

clock32kHz

32.768 kHz

0-22.4 pF

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