DA14581 datasheet(13/152 Pages) DIALOG

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Datasheet

Revision 3.0

18-Dec-2015

CFR0011-120-00-FM Rev 5

13 of 152

DA14581

Low Power Bluetooth Smart SoC with optimized boot time

FINAL

with N = 0 to (216-1), M = 0 to (216-1)

• Programmable duty cycle:

• Separately programmable interrupt timer:

Timer 2

• 14-bit general purpose timer

• Ability to generate 3 Pulse Width Modulated signals

(PWM2, PWM3 and PWM4)

• Input clock frequency:

with N = 1, 2, 4 or 8

and sys_clk = 16 MHz or 32 kHz

• Programmable output frequency:

• Three outputs with Programmable duty cycle from

0 % to 100 %

• Used for white LED intensity (on/off) control

4.7.2 Wake-Up timer

The Wake-up timer can be programmed to wake up the

DA14581 from power down mode after a prepro-

grammed number of GPIO events.

Features

• Monitors any GPIO state change

• Implements debouncing time from 0 upto 63 ms

• Accumulates external events and compares the

number to a programmed value

• Generates an interrupt to the CPU

4.7.3 Watchdog timer

The Watchdog timer is an 8-bit timer with sign bit that

can be used to detect an unexpected execution

sequence caused by a software run-away and can

generate a full system reset or a Non-Maskable Inter-

rupt (NMI).

Features

• 8 bits down counter with sign bit, clocked with a

10.24 ms clock for a maximum 2.6 s time-out.

• Non-Maskable Interrupt (NMI) or WDOG reset.

• Optional automatic WDOG reset if NMI handler fails

to update the Watchdog register.

• Non-maskable Watchdog freeze of the Cortex-M0

Debug module when the Cortex-M0 is halted in

Debug state.

Maskable Watchdog freeze by user program. Note that

if the system is not remapped, i.e. SysRAM is at

address 0x20000000, then a watchdog fire will trigger

the BootROM code to be executed again.

4.8 CLOCK/RESET

4.8.1 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/

Deep Sleep modes. The 16 MHz oscillator can be

trimmed.

The principle schematic of the two oscillators is shown

in Figure 6 below. No external components to the

DA14581 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 DA14581: one provid-

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

and one providing a frequency in the range of 10.5 kHz

(RCX).

4.8.2 Reset

The DA14581 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

16, 8, 4, 2 MHz or 32 kHz



------------------------------------------------------------------------





-------------------------------------------- 100



16, 8, 4, 2 MHz or 32 kHz



ON 1



------------------------------------------------------------------------

fIN

sys_clk

-------------------

fOUT

fIN

------



 to

fIN

–

------------------







Figure 6: Crystal oscillator circuits

clock16MHz

16 MHz

clock32kHz

32.768 kHz

0-22.4 pF

DA14581 Datasheet(PDF) 13 Page - Dialog Semiconductor

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