Datasheet

Electrical characteristics STM32F334x4 STM32F334x6 STM32F334x8
80/121 DocID025409 Rev 8
Figure 24. 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 V
IL(NRST)
max level specified in
Table 53. Otherwise the reset is 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.
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Table 54. HRTIM1 characteristics
Symbol Parameter Conditions Min. Typ. Max. Unit
T
A
Timer ambient
temperature range
f
HRTIM
=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
f
HRTIM
=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
f
HRTIM
HRTIM input clock
for DLL calibration
As per T
A
conditions
128 - 144 MHz
t
HRTIM
6.9 - 7.8 ns
t
RES(HRTIM)
Timer resolution
time
f
HRTIM
=144MHz
(1)
, TA
from -40 to 105°C
- 217 - ps
f
HRTIM
=128MHz
(2)
,TA from
-10 to 105°C
- 244 - ps
Res
HRTIM
Timer resolution - - - 16 bit
t
DTG
Dead time
generator clock
period
-0.125-16t
HRTIM
f
HRTIM
=144MHz
(1)
0.868 - 111.10 ns
|t
DTR| / |
t
DTF|
max
Dead time range
(absolute value)
---511t
DTG
f
HRTIM
=144MHz
(1)
- - 56.77 µs
f
CHPFRQ
Chopper stage
clock frequency
- 1/256 - 1/16 f
HRTIM
f
HRTIM
=144MHz
(1)
0.562 - 9 MHz
t
1STPW
Chopper first
pulse length
-16-256t
HRTIM
f
HRTIM
=144MHz
(1)
0.111 - 1.77 µs
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