STM32WL55JC datasheet(131/145 Pages) STMICROELECTRONICS

131 / 145 page

DS13293 Rev 1

131/145

STM32WL55/54xx

Electrical characteristics

135

All I2C SDA and SCL I/Os embed an analog filter (refer to the table below for its

characteristics).

USART characteristics

Unless otherwise specified, the parameters given in the table below are derived from tests

performed under the ambient temperature, fPCLKx frequency and supply voltage conditions

summarized in Table 25: General operating conditions, with the following configuration:

•

OSPEEDRy[1:0] set to 10 (output speed)

•

capacitive load C = 30 pF

•

measurement points at CMOS levels: 0.5 x VDD

Refer to Section 5.3.16: I/O port characteristics for more details on the input/output alternate

function characteristics (NSS, CK, TX, and RX for USART).

Table 93. I2C analog filter characteristics(1)

Symbol

Parameter

Min

Max

Unit

tAF

Maximum pulse width of spikes that are suppressed by the analog filter

50(2)

100(3)

1. Guaranteed by characterization.

2. Spikes with widths below tAF(min) filtered.

3. Spikes with widths above tAF(max) not filtered.

Table 94. USART characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fCK

USART clock frequency

Master mode

MHz

Slave mode

tsu(NSS)

NSS setup time

Slave mode

tker + 5

th(NSS)

NSS hold time

Slave mode

tw(CKH)

CK high time

Master mode

1 / fCK / 2 - 1

1 / fCK / 2

1 / fCK / 2 + 1

tw(CKL)

CK low time

tsu(RX)

Data input setup time

Master mode

Slave mode

th(RX)

Data input hold time

Master mode

Slave mode

tv(TX)

Data output valid time

Master mode

Slave mode

0.5

th(TX)

Data output hold time

Master mode

Slave mode

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