R5F564MJGDFC datasheet(146/162 Pages) RENESAS

146 / 162 page

R01DS0173EJ0120 Rev.1.20

Page 146 of 162

Oct 20, 2022

RX64M Group

2. Electrical Characteristics

2.10

Battery Backup Function Characteristics

Note 1. The VBATT voltage must not fall below its lower limit VBATTSW when the source of supply is switched to VBATT from VCC due

to a drop in VCC.

Note 2. The VCC-off period in switching of the power supply indicates the period from VCC falling below the minimum value of the

battery backup switching threshold voltage (VDETBATT) until the source of power is switched to VBATT. If VCC recovers within

this period, the source may not be switched to VBATT and supply from VCC is continued instead.

Figure 2.95

Battery Backup Function Characteristics

Table 2.55

Battery Backup Function Characteristics

Conditions: VCC = AVCC0 = AVCC1 = VCC_USB = 2.7 to 3.6 V, 2.7

≤ VREFH0 ≤ AVCC0,

VCC_USBA = AVCC_USBA = 3.0 to 3.6 V,

VSS = AVSS0 = AVSS1 = VREFL0 = VSS_USB = VSS1_USBA = VSS2_USBA = PVSS_USBA = AVSS_USBA = 0 V,

VBATT = 2.0 to 3.6 V, Ta = Topr

Item

Symbol

Min.

Typ.

Max.

Unit

Test

Conditions

Voltage level for switching to battery backup

VDETBATT

2.50

2.60

2.70

Figure 2.95

Lower-limit VBATT voltage for power supply switching due to

VCC voltage drop*1

VBATTSW

2.70

—

VCC-off period for starting power supply switching*1

tVOFFBATT

200

—

µs

VCC

Guaranteed

voltage range

for VCC

Battery backup

power domain

tVOFFBATT

VDETBATT

VBATT

Guaranteed

voltage range

for VBATT

VBATTSW

VCC is supplied

VBATT is supplied

VCC is supplied

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