RA4M3 datasheet(75/98 Pages) RENESAS

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tVOFF

Vdet2

VCC

tdet

tLVD2

Td(E-A)

LVCMPCR.LVD2E

LVD2

Comparator output

LVD2CR0.CMPE

LVD2SR.MON

Internal reset signal

(active-low)

When LVD2CR0.RN = 0

When LVD2CR0.RN = 1

VLVH

tLVD2

Figure 2.59

Voltage detection circuit timing (Vdet2)

2.10

VBATT Characteristics

Table 2.44

Battery backup function characteristics

Conditions: VCC = AVCC0 = VCC_USB = 2.7 to 3.6 V, 2.7 ≤ VREFH0/VREFH ≤ AVCC0, VBATT = 1.65 to 3.6 V*1

Parameter

Symbol

Min

Typ

Max

Unit

Test conditions

Voltage level for switching to battery backup

VDETBATT

2.50

2.60

2.70

Figure 2.60

Lower-limit VBATT voltage for power supply

switching caused by VCC voltage drop

VBATTSW

2.70

—

VCC-off period for starting power supply

switching

tVOFFBATT

200

—

µs

VBATT low voltage detection level

Vbattldet

1.8

1.9

2.0

Figure 2.61

Minimum VBATT down time

tBATTOFF

200

—

µs

Response delay

tBATTdet

—

200

µs

VBATT monitor operation stabilization

time (after VBATTMNSELR.VBATTMNSEL is

changed to 1)

td(E-A)

—

µs

VBATT current increase (when

VBATTMNSELR.VBATTMNSEL is 1 compared

to the case that VBATTMNSELR.VBATTMNSEL

is 0)

IVBATTSEL

—

140

350

Note:

The VCC-off period for starting power supply switching indicates the period in which VCC is below the minimum value of the voltage

level for switching to battery backup (VDETBATT).

Note 1. Low CL crystal cannot be used below VBATT = 1.8 V.

RA4M3 Datasheet

2. Electrical Characteristics

R01DS0368EJ0150 Rev.1.50

Apr 25, 2025

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