DA16200 datasheet(28/154 Pages) RENESAS

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DA16200

Ultra Low Power Wi-Fi SoC

Datasheet

Revision 3.6

04-Jan-2023

CFR0011-120-00

28 of 153

5.7

Brown-Out and Black-Out

The device enters a brown-out condition whenever the input voltage dips below VBROWN (see

Table 23). This condition must be considered during design of the power supply routing, especially if

the SoC is operated from a battery. High-current operations, like TX operation, cause a dip in the

supply voltage, potentially triggering a Brown-Out. The resistance includes the internal resistance of

the battery, contact resistance of the battery holder (for example, four contacts for two AA batteries),

wiring resistance, and PCB routing resistance.

VBAT(V)

Time(sec)

BR_OUT_VBAT(V)

BL_OUT_VBAT(V)

Black-Out Detector

Hysteresis

Brown-Out Detector Hysteresis

Battery Discharge

-> Battery Voltage is down

Enter ＂Brown-Out＂ Condition

Enter ＂Black-Out＂ Condition

Exit ＂Black-Out＂ Condition

Exit ＂Brown-Out＂ Condition

Normal operated Condition

Brown-Out

Operated

Condition

Black-Out Operated Condition

Brown-Out

Operated

Condition

Normal operated Condition

Figure 6: Brown-Out and Black-Out Levels

Brown-out and black-out conditions only operate in normal mode. The black-out condition is

equivalent to a hardware reset event in which all states within the device are lost. Table 23 lists the

brown-out and black-out voltage levels.

Table 23: Brown-Out and Black-Out Voltage Levels

Condition

Voltage

Hysteresis

Operation

Vbrown-out

2.10 V (Note 1)

90 mV

S/W Control

Vblack-out

1.75 V (Note 1)

90 mV

Full boot

Note 1

Recommended voltage level. Adjustable depending on the application condition.

5.8

Clock Electrical Characteristics

DA16200 needs two clock sources. One is the 32.768 kHz clock used by the RTC block, and the

other is the 40 MHz clock for the internal processor and Wi-Fi system. More specifically, the 40 MHz

clock is used as a source clock for the internal PLL, while the PLL output is used for the internal

processor and Wi-Fi system block.

5.8.1

RTC Clock Source

The 32.768 kHz RTC clock source is necessary for the free-running counter in the RTC block. The

RTC block of the SoC contains an internal 32.768 kHz RC oscillator as well, which is used as a clock

for chip initialization before the external 32.768 kHz crystal reaches the stable time in the initial stage.

It is necessary to convert it into an external clock for accurate clock counting after the initialization

stage. This process is executed through the register setting. Table 24 shows the suitable loading

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