RA4W1 datasheet(87/105 Pages) RENESAS

87 / 105 page

R01DS0359EJ0100 Rev.1.00

Page 87 of 105

Mar 31, 2020

RA4W1 Datasheet

2. Electrical Characteristics

2.10

VBATT 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 2.72

Power supply switching and LVD0 reset timing

Table 2.54

Battery backup function characteristics

Conditions: VCC = AVCC0 = 1.8V to 3.6V, VBATT = 1.6 to 3.6 V

Parameter

Symbol

Min

Typ

Max

Unit

Test conditions

Voltage level for switching to battery backup (falling)

VDETBATT

1.99

2.09

2.19

Figure 2.72,

Figure 2.73

Hysteresis width for switching to battery back up

VVBATTH

100

VCC-off period for starting power supply switching

tVOFFBATT

300

μs-

Voltage detection level

VBATT_Power-on reset (VBATT_POR)

VVBATPOR

1.30

1.40

1.50

Figure 2.72,

Figure 2.73

Wait time after VBATT_POR reset time cancellation

tVBATPOR

Level for detection of voltage drop on

the VBATT pin (falling)

VBTLVDLVL[1:0] = 10b VDETBATLVD

2.11

2.2

2.29

Figure 2.74

VBTLVDLVL[1:0] = 11b

1.92

2.08

Hysteresis width for VBATT pin LVD

VVBATLVDTH

VBATT pin LVD operation stabilization time

td_vbat

300

μs

Figure 2.74

VBATT pin LVD response delay time

tdet_vbat

350

μs

Allowable voltage change rising/falling gradient

dt/dVCC

1.0

ms/V

VCC voltage level for access to the VBATT backup registers

V_BKBATT

1.8

VDETBATT

VVBATH

VCC supplied

VBATT

VCC

VVBATPOR

VBATT supplied

VCC supplied

Backup power area

Internal reset signal

(active-low)

tLVD0

Vdet0

VLVH

tdet

VPOR

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