Table 29. Comp Differences Between Stm32L1 Series And Stm32L4 Series - ST STM32L1 Series Application Note

AN4612
4.21 COMP
The table below presents the differences between the COMP interface of STM32L1 Series
and STM32L4 Series:

Table 29. COMP differences between STM32L1 Series and STM32L4 Series

COMP
COMP1 fixed threshold
Type
COMP2 rail-to-rail
COMP1:
– 25 (Cat.1,2)
– 32 (Cat.3,4,5) (29 ext IO + T sensor +
Inputs
COMP2:
Non inverting:
– 2 (Cat.1,2) (PB4, PB5)
– 4 (Cat3,4,5) (PB4, PB5, PB6, PB7)
Inverting:
– 7 (PB3, DAC_OUT1/2, V
1/2, 1/4)
Generation of input capture and OCREF clear
signals for TIM2, TIM3, TIM4 and input
capture for TIM10.
Outputs
Generation of wakeup interrupt or events
(EXTI line).
Features
Programmable speed/consumption (COMP2)
Supply
1.65 V to 3.6 V
requirement
Input range
Color key:
= New feature or new architecture (difference between STM32L1 and STM32L4 Series)
= Same feature, but specification change or enhancement
= Feature not available (NA)
STM32L1 Series
(24 ext IO + T sensor)
OPAMP1/2)
ₓ 1, 3/4,
REFINT
Window comparator
NA
V
REF-
DocID027094 Rev 3
STM32L4 Series
COMP1, COMP2 rail-to-rail
COMP1:
Non Inverting:
– 2 (PC5, PB2)
Inverting:
– 8 (PB1,PC3, DAC_OUT1/2, V
3/4, 1/2, 1/4)
COMP2:
Non Inverting:
– 2 (PB4, PB6)
Inverting:
– 8 (PB3, PB7, DAC_OUT1/2, V
3/4, 1/2, 1/4)
Generation of break input signals for timers
through GPIO alternate function.
TIM1/TIM8 (Cat. 2 devices)
TIM1 (Cat. 4 devices)
Generation of wakeup interrupt or events
(EXTI line).
Output with blanking source
Programmable hysteresis
Programmable speed/consumption
(COMP1/COMP2)
1.62 V to 3.6 V
≤ V ≤ V
IN REF+
Peripheral migration
ₓ 1,
REFINT
ₓ 1,
REFINT
55/58
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