STM32U535NET6QTR datasheet(243/278 Pages) STMICROELECTRONICS

Part #	STM32U535NET6QTR

Description	Ultra-low-power Arm® Cortex®-M33 MCUTrustZone®FPU,240 DMIPS, up to 512 KB flash memory, 274 KB SRAM

PDF	278 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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DS14217 Rev 1

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STM32U535xx

Electrical characteristics

253

5.3.32

Delay block characteristics

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

performed under the ambient temperature, fHCLK frequency and VDD supply voltage

conditions summarized in Table 32.

Table 122. IWDG min/max timeout period at 32 kHz (LSI)(1)

Prescaler divider PR[2:0] bits Min timeout RL[11:0] = 0x000

Max timeout RL[11:0] = 0xFFF

Unit

0.125

512

0.250

1024

/16

0.500

2048

/32

1.0

4096

/64

2.0

8192

/128

4.0

16384

/256

6 or 7

8.0

32768

1. The exact timings still depend on the phasing of the APB interface clock versus the LSI clock, so that there is always a full

RC period of uncertainty.

Table 123. WWDG min/max timeout value at 160 MHz (PCLK)

Prescaler

WDGTB

Min timeout value

Max timeout value

Unit

0.025

1.638

0.051

3.276

0.102

6.553

0.204

13.107

0.409

26.214

0.819

52.428

1.177

75.366

128

3.276

209.715

Table 124. Delay block characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

tinit

Initial delay

350

750

1550

t∆

Unit delay

1. Evaluated by characterization. Not tested in production.

STM32U535NET6QTR Datasheet(PDF) 243 Page - STMicroelectronics

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