DA16200 datasheet(38/154 Pages) RENESAS

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DA16200

Ultra Low Power Wi-Fi SoC

Datasheet

Revision 3.6

04-Jan-2023

CFR0011-120-00

38 of 153

7.4

RTC

Among the pins in DA16200, four special pins are directly connected to the RTC block, which are

RTC_PWR_KEY, RTC_GPO, RTC_WAKE_UP, and RTC_WAKE_UP2.

Table 28: RTC Pin Description

Pin Name

Pin Number

Description

QFN

fcCSP

RTC_PWR_KEY

RTC_PWR_KEY represents a power key for the RTC block. When

this pin is enabled, the RTC starts to work by following a

predefined power-up sequence and eventually all the necessary

power is supplied to all the sub-blocks including the main digital

block in DA16200. When disabled, all blocks are powered off and

this mode is defined as Sleep mode 1. DA16200 consumes

minimum leakage current in Sleep mode 1.

RTC_GPO

This pin is an output and high level is 'VBAT'.

It has three different functions:

● GPO function: its output value can be set as ‘1’ or ‘0’ via

● Flash control function: when in Sleep mode, it becomes ‘0’;

when in Active

mode, it is ‘1’

● Sensor wake-up function: when the sensor wake-up function

is used (Section 9.8.4), a programmable periodic signal is

provided for an external device. Inside the RTC, there are

registers to set count values

RTC_WAKE_UP

This pin is an input pin for receiving an external event signal from

an external device like a sensor. The RTC block detects an

external event signal via this pin and wakes up DA16200 from

Sleep mode 2 or Sleep mode 3.

RTC_WAKE_UP2

DA16200 contains not only an on-chip oscillator that uses a 32.768 kHz external crystal but also an

internal 32.768 kHz RC oscillator for faster initialization, which leads to prompt clock generation after

power-up and is used until the external crystal becomes stable. Afterwards, the input source can be

switched to the external crystal via a register setting.

The RTC block has a 36-bit real time counter. Its resolution is equal to one clock period of 32.768

kHz. The count value can be read via the register read command.

7.4.1

Wake-up Controller

The wake-up controller is designed to wake up DA16200 from a Sleep mode by an external signal. It

detects an edge trigger of the wake-up signal and selects either the rising edge or the falling edge.

Also, the wake-up signal must be maintained for at least 200 µs upon occurrence of transition on one

side.

When it comes to the source of wake-up, 11 digital I/Os in addition to the two pins directly connected

to the RTC block can be used. Although up to 11 digital I/Os are available for use, the maximum

number of digital I/Os that are simultaneously available is eight. Table 29 describes the digital I/Os

that are available for simultaneous use.

Table 29: Wake-up Sources

QFN and fcCSP Package

Input Selection = 0

Input Selection = 1

GPIOA4

GPIOA5

GPIOA6

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