Datasheet

DocID029968 Rev 3 173/210
STM32L452xx Electrical characteristics
186
6.3.23 V
BAT
monitoring characteristics
6.3.24 Timer characteristics
The parameters given in the following tables are guaranteed by design.
Refer to Section 6.3.14: I/O port characteristics for details on the input/output alternate
function characteristics (output compare, input capture, external clock, PWM output).
Table 88. V
BAT
monitoring characteristics
Symbol Parameter Min Typ Max Unit
R Resistor bridge for V
BAT
-39-k
QRatio on V
BAT
measurement - 3 - -
Er
(1)
1. Guaranteed by design.
Error on Q -10 - 10 %
t
S_vbat
(1)
ADC sampling time when reading the VBAT 12 - - µs
Table 89. V
BAT
charging characteristics
Symbol Parameter Conditions Min Typ Max Unit
R
BC
Battery
charging
resistor
VBRS = 0 - 5 -
k
VBRS = 1 - 1.5 -
Table 90. TIMx
(1)
characteristics
1. TIMx
,
is used as a general term in which x stands for 1,2,3,4,5,6,7,8,15,16 or 17.
Symbol Parameter Conditions Min Max Unit
t
res(TIM)
Timer resolution time
-1-t
TIMxCLK
f
TIMxCLK
= 80 MHz 12.5 - ns
f
EXT
Timer external clock
frequency on CH1 to CH4
-0f
TIMxCLK
/2 MHz
f
TIMxCLK
= 80 MHz 0 40 MHz
Res
TIM
Timer resolution
TIMx (except
TIM2)
-16
bit
TIM2 - 32
t
COUNTER
16-bit counter clock
period
- 1 65536 t
TIMxCLK
f
TIMxCLK
= 80 MHz 0.0125 819.2 µs
t
MAX_COUNT
Maximum possible count
with 32-bit counter
- - 65536 × 65536 t
TIMxCLK
f
TIMxCLK
= 80 MHz - 53.68 s
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