R5F564MLDDFC datasheet(212/228 Pages) RENESAS

212 / 228 page

R01DS0173EJ0110 Rev.1.10

Page 212 of 228

Oct 24, 2016

RX64M Group

5. Electrical Characteristics

5.10

Battery Backup Function Characteristics

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).

Figure 5.84

Battery Backup Function Characteristics

Table 5.52

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 5.84

Lower-limit VBATT voltage for power supply switching due to

VCC voltage drop

VBATTSW

2.70

—

VCC-off period for starting power supply switching

tVOFFBATT

200

—

μs

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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