STM32U073RCT3TR datasheet(98/146 Pages) STMICROELECTRONICS

98 / 146 page

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply voltage

Normal mode

VRS = 1

2.8

3.6

Degraded mode(1)

VRS = 0

1.65

2.4

VRS = 1

1.65

2.8

VREFBUF_

OUT

Voltage reference output

Iload = 100 µA

T = 30 °C

VRS = 0

2.038

2.042 2.046

VRS = 1

2.497

2.5

2.503

VRS = 0

VDDA-150 mV

VDDA

VRS = 1

VDDA-150 mV

VDDA

TRIM

Trim step resolution

±0.05 ±0.1

Load capacitor

0.5

1.5

µF

esr

Equivalent Serial Resistor of Cload

Iload

Static load current

Iline_reg

Line regulation

2.8 V ≤ VDDA ≤ 3.6 V

Iload = 500 µA

200

1000

ppm/V

Iload = 4 mA

100

500

Iload_reg

Load regulation

500 μA ≤ Iload ≤4 mA Normal mode

500

ppm/mA

TCoeff_vrefbuf

Temperature coefficient of VREFBUF(2)

-40 °C < TJ < +125 °C

ppm/ °C

PSRR

Power supply rejection

100 kHz

tSTART

Start-up time

CL = 0.5 µF(3)

300

350

µs

CL = 1.1 µF(3)

500

650

CL = 1.5 µF(3)

650

800

IINRUSH

Control of maximum DC current drive on

VREFBUF_OUT during start-up phase(4)

IDDA(VREFBUF) VREFBUF consumption from VDDA

Iload = 0 µA

µA

Iload = 500 µA

Iload = 4 mA

1. In degraded mode, the voltage reference buffer can not maintain accurately the output voltage which will follow (VDDA - drop voltage).

2. The temperature coefficient at VREF+ output is the sum of TCoeff_vrefint and TCoeff_vrefbuf.

3. The capacitive load must include a 100 nF capacitor in order to cut-off the high frequency noise.

4. To correctly control the VREFBUF inrush current during start-up phase and scaling change, the VDDA voltage should be in the range [2.4 V

to 3.6 V] and [2.8 V to 3.6 V] respectively for VRS = 0 and VRS = 1.

STM32U073x8/B/C

Electrical characteristics

DS14548 - Rev 2

page 98/146

STM32U073RCT3TR Datasheet(PDF) 98 Page - STMicroelectronics

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