RA4W1 datasheet(42/105 Pages) RENESAS

42 / 105 page

R01DS0359EJ0100 Rev.1.00

Page 42 of 105

Mar 31, 2020

RA4W1 Datasheet

2. Electrical Characteristics

2.2.10

VCC Rise and Fall Gradient and Ripple Frequency

Note 1.

When OFS1.LVDAS = 0.

Note 2.

At boot mode, the reset from voltage monitor 0 is disabled regardless of the value of the OFS1.LVDAS bit.

Figure 2.22

Ripple waveform

Table 2.16

Rise and fall gradient characteristics

Conditions: VCC = AVCC0 = 0 to 3.6 V

Parameter

Symbol Min

Typ

Max

Unit

Test conditions

Power-on VCC

rising gradient

Voltage monitor 0 reset disabled at startup (normal

startup)

SrVCC

0.02

ms/V

Voltage monitor 0 reset enabled at startup*1

0.02

SCI/USB Boot mode*2

0.02

Table 2.17

Rising and falling gradient and ripple frequency characteristics

Conditions: VCC = AVCC0 = VCC_USB = 1.8 to 3.6 V

The ripple voltage must meet the allowable ripple frequency fr(VCC) within the range between the VCC upper limit (3.6 V) and lower limit

(1.8 V).

When VCC change exceeds VCC ±10%, the allowable voltage change rising/falling gradient dt/dVCC must be met.

Parameter

Symbol

Min

Typ

Max

Unit

Test conditions

Allowable ripple frequency

fr (VCC)

--10

kHz

Figure 2.22

Vr (VCC) ≤ VCC × 0.2

--1

MHz

Figure 2.22

Vr (VCC) ≤ VCC × 0.08

--10

MHz

Figure 2.22

Vr (VCC) ≤ VCC × 0.06

Allowable voltage change rising and

falling gradient

dt/dVCC

1.0

ms/V

When VCC change exceeds VCC ±10%

Vr(VCC)

VCC

1/fr(VCC)

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