DA16200 datasheet(31/154 Pages) RENESAS

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DA16200

Ultra Low Power Wi-Fi SoC

Datasheet

Revision 3.6

04-Jan-2023

CFR0011-120-00

31 of 153

Power Management

DA16200 has an RTC block which provides power management and function control for low power

operation. In normal operation, the RTC block is always powered on when RTC_PWR_KEY is

enabled. The RTC block als

o has a control function for DA16200’s internal power supplying

components, like LDOs, DC-DCs, and power switches.

6.1

Power On Sequence

The sequence after the initial switching from power-off to power-on is shown in Figure 11.

The RTC_PWR_KEY of DA16200 is a pin that enables the RTC block. Once RTC_PWR_KEY is

enabled after VBAT power is supplied, all the internal regulators are turned on automatically in the

sequence predefined by the RTC block.

Once RTC_PWR_KEY is turned on, LDOs for both XTAL and digital I/O are turned on shortly and

then the DC-DC regulator is turned on according to the predefined interval. The enabling intervals

can also be modified in the register settings after initial power-up.

CLK_32K

VBAT

POWER_KEY

IO Voltage

50% VBAT

50% IO

50% VBAT

Figure 11: Power On Sequence

Table 26: Power On Sequence Timing Requirements

Name

Description

Min

Typ

Max

Unit

VBAT power-on time from 10 % to 90 % of VBAT

IO voltage and VCC supply

RTC_PWR_KEY turn-on time from 50 % VBAT to

50 % POWER_KEY * Note 1

5*T0

Internal RC oscillator wake-up time

217

µs

Note 1

if the T0 = 10 ms to turn on VBAT, the recommended T2 is 50 ms for the safe booting operation. It

would be externally controlled by MCU or it would be implemented using RC filter at the input of

RTC_PWR_KEY. The recommended C is 470 nF or 1uF (not to exceed 1uF) and R value is chosen to

have T2 delay. For example, R and C values will be 82

kΩ and 1 uF when T0 = 10 ms.

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