S3A7 datasheet(52/133 Pages) RENESAS

Nome de Peças	S3A7

Descrição Electrónicos	32-bit ARM Cortex-M4 microcontroller

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R01DS0263EU0100 Rev.1.00

Page 52 of 130

Feb 23, 2016

S3A7

2. Electrical Characteristics

2.2.10

VCC Rise and Fall Gradient and Ripple Frequency

Note 1.

When OFS1.LVDAS = 0.

Note 2.

Turn the power supply voltage on according to the normal startup rising gradient because the register settings set by OFS1 are

not read in boot mode.

Figure 2.25

Ripple waveform

Table 2.15

Rise and fall gradient characteristics

Conditions: VCC = AVCC0 = 0 to 5.5 V

Item

Symbol Min

Typ

Max

Unit

Test conditions

Power-on VCC

rising gradient

Voltage monitor 0 reset disabled at startup

SrVCC

0.02

-

2

ms/V

-

Voltage monitor 0 reset enabled at startup*1, *2

0.02

-

Table 2.16

Rising and falling gradient and ripple frequency characteristics

Conditions: VCC = AVCC0 = VCC_USB = 1.6 to 5.5 V

The ripple voltage must meet the allowable ripple frequency fr(VCC) within the range between the VCC upper limit (5.5 V) and lower limit

(1.6 V).

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

Item

Symbol

Min

Typ

Max

Unit

Test conditions

Allowable ripple frequency

fr (VCC)

--10

kHz

Figure 2.25

Vr (VCC) ≤ VCC × 0.2

--1

MHz

Figure 2.25

Vr (VCC) ≤ VCC × 0.08

--10

MHz

Figure 2.25

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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