R5F5671CDDLE datasheet(161/179 Pages) RENESAS

161 / 179 page

R01DS0373EJ0120 Rev.1.20

Page 161 of 179

Sep 30, 2024

RX671 Group

2. Electrical Characteristics

2.11

Battery Backup Function Characteristics

Note 1. The VCC-off period for switching power supply indicates the period from VCC falling below the minimum value of the battery

backup switching threshold voltage (VDETBATT) until the source of supply is switched to VBATT. When the VCC recovers within

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

Note 2. When the VBKP recovers within this period, the backup domain reset signal may not be generated.

Figure 2.98

Battery Backup Function Characteristics

Table 2.60

Battery Backup Function Characteristics

Conditions: VCC = AVCC0 = AVCC1 = VCC_USB = 2.7 to 3.6 V, 2.7 V ≤ VREFH0 ≤ AVCC0,

VSS = AVSS0 = AVSS1 = VREFL0 = VSS_USB = 0 V,

VBATT = 1.62 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 2.98

Lower-limit VBATT voltage for power supply switching due to

VCC voltage drop

VBATTSW

2.00

—

VCC-off period for starting power supply switching*1

tVOFFBATT

200

—

µs

Backup domain power-down detection level

VPDR(BKP)

1.45

1.5

1.55

Figure 2.99

Time delay in assertion of the reset signal for the backup

domain*2

tp(PDRL)

—

2000

µs

Time delay in negation of the reset signal for the backup

domain

tp(PDRH)

—

1000

µs

Temper input pulse width

tw(TAMPI)

200

—

Figure 2.100

VBATT

VCC

VDETBATT

VBATTSW

tVOFFBATT

VBATT

Switching prohibited

VBATT

Switching prohibited

VCC supply

VBATT supply

VCC voltage

guaranteed range

VBATT voltage

guaranteed range

Backup power

area

The VBATT voltage when the supplied power source switches from VCC to VBATT should not be lower than

VBATTSW, the lower-limit VBATT voltage for switching between power supplies due to a drop in the VCC voltage.

Note.

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