STM32L021D4 datasheet(79/114 Pages) STMICROELECTRONICS

Part #	STM32L021D4

Description	Access line ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, 16KB Flash, 2KB SRAM, 512B EEPROM, ADC, AES

PDF	114 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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STM32L021x4

Electrical characteristics

Figure 24. I/O AC characteristics definition

6.3.14

NRST pin characteristics

The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up

resistor, RPU , except when it is internally driven low (see Table 52).

Unless otherwise specified, the parameters given in Table 52 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 17.

Table 52. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)(1) NRST input low level voltage

0.3VDD

VIH(NRST)(1) NRST input high level voltage

0.39VDD+

0.59

VOL(NRST)(1) NRST output low level voltage

IOL = 2 mA

2.7 V < VDD < 3.6 V

0.4

IOL = 1.5 mA

1.65 V < VDD < 2.7 V

Vhys(NRST)(1)

NRST Schmitt trigger voltage

hysteresis

10%VDD(2)

-mV

RPU

Weak pull-up equivalent

resistor(3)

VIN = VSS

VF(NRST)(1)

NRST input filtered pulse

VNF(NRST)(1) NRST input not filtered pulse

350

1. Guaranteed by design, not tested in production.

2. 200 mV minimum value

3. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series

resistance is around 10%.

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