STM32F334 datasheet(79/115 Pages) STMICROELECTRONICS

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STM32F334x4 STM32F334x6 STM32F334x8

Electrical characteristics

100

Figure 23. Recommended NRST pin protection

1. The reset network protects the device against parasitic resets.

2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in

Table 53. Otherwise the reset will not be taken into account by the device.

3. The external capacitor on NRST must be placed as close as possible to the device.

4. Place the external capacitor 0.1u F on NRST as close as possible to the chip.

6.3.16

High-resolution timer (HRTIM)

The parameters given in Table 54 are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 19.

Table 54. HRTIM1 characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Timer ambient

temperature range

fHRTIM=144MHz (1)

1. Using HSE with 8MHz XTAL as clock source, configuring PLL to get PLLCLK=144MHz, and selecting

PLLCLKx2 as HRTIM clock source. (Refer to Reset and clock control section in RM0364.)

-40

105

°C

fHRTIM=128MHz (2)

2. Using HSI (internal 8MHz RC oscillator), configuring PLL to get PLLCLK=128MHz, and selecting

PLLCLKx2 as HRTIM clock source. (Refer to Reset and clock control section in RM0364.

-10

105

°C

fHRTIM

HRTIM input clock

for DLL calibration

As per TA conditions

128

144

MHz

tHRTIM

6.9

7.8

tRES(HRTIM)

Timer resolution

time

fHRTIM=144MHz (1), TA

from -40 to 105°C

-217

fHRTIM=128MHz (2),TA

from -10 to 105°C

-244

ResHRTIM Timer resolution

bit

tDTG

Dead time

generator clock

period

0.125

tHRTIM

fHRTIM=144MHz (1)

0.868

111.10

|tDTR| / |tDTF|

max

Dead time range

(absolute value)

511

tDTG

fHRTIM=144MHz (1)

56.77

µs

fCHPFRQ

Chopper stage

clock frequency

1/256

1/16

fHRTIM

fHRTIM=144MHz (1)

0.562

MHz

t1STPW

Chopper first

pulse length

-16

256

tHRTIM

fHRTIM=144MHz (1)

0.111

1.77

µs

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