STM32WLE4JC datasheet(120/145 Pages) STMICROELECTRONICS

120 / 145 page

Electrical characteristics

STM32WLE5/E4xx

120/145

DS13105 Rev 8

5.3.21

VBAT monitoring characteristics

5.3.22

Voltage reference buffer characteristics

Table 81. VBAT monitoring characteristics(1)

Symbol

Parameter

Min

Typ

Max

Unit

Resistor bridge for VBAT(2)

-3 * 39

kΩ

Ratio on VBAT measurement

Er(3)

Error on Q

-10

tS_vbat(3)

ADC sampling time when reading VBAT

µs

1. 1.55 V

< VBAT < 3.6 V.

2. VDD on STM32WLE5/4UxYx devices.

3. Guaranteed by design.

Table 82. VBAT charging characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

RBC

Battery charging resistor

VBRS = 0

kΩ

VBRS = 1

1.5

Table 83. VREFBUF characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply

voltage

Normal mode

VRS = 0

2.4

3.6

VRS = 1

2.8

3.6

Degraded mode(2)

VRS = 0

1.62

2.4

VRS = 1

1.62

2.8

VREFBUF_

OUT

Voltage

reference output

Normal mode

ILOAD=100 μA,

TJ = 30 °C

VRS = 0

2.044

2.048

2.052

VRS = 1

2.495

2.5

2.505

Normal mode

ILOAD=100 μA,

-40 °C < TJ < 125 °C

VRS = 0

2.030

2.048

2.057

VRS = 1

2.478

2.500

2.509

Degraded mode(2)

VRS = 0

VDDA - 250 mV

VDDA

VRS = 1

VDDA - 250 mV

VDDA

TRIM

Trim step

resolution

±0.05

±0.1

Load capacitor

0.5

1.5

µF

esr

Equivalent

series resistor

of Cload

Ω

Iload

Static load

current

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