Built-In Idd Measurement Circuit; Dd Measurement Circuit - STMicroelectronics UM1079 User Manual

Hardware and layout
Three pairs of I/O ports are assigned to the linear touch sensor / touchkeys. Each pair must
belong to the same analog switch group:
•
PA6, PA7 (group 2)
•
PC4, PC5 (group 9)
•
PB0, PB1 (group 3)
To minimize the noise, these pairs are dedicated to the linear touch sensor / touchkeys and
are not connected to external headers.
To design a touch sensing application, refer to the following documentation and firmware:
•
For details concerning I/O ports, refer to the STM32L152RCT6 datasheet.
• For information on software development, see discovery application software on
www.st.com/mcu.
•
For more detail concerning touch sensing application design and layout, refer to
Guidelines for designing touch sensing applications with surface sensors (AN4312).
•
STM32 touch sensing library available from www.st.com/mcu
4.7 Built-in I
The 32L152CDISCOVERY built-in I
consumption of the STM32L152RCT6 and to display the value on the LCD glass while the
MCU is in Run or Low-power modes.
•
JP1 ON: the STM32L152RCT6 is powered through the I
(default).
•
JP1 OFF: the STM32L152RCT6 is directly powered. The I
bypassed.
Note: When jumper JP1 is removed, the current consumption of the STM32L152RCT6 can be
measured by connecting an ammeter between jumper pin 1 and pin 2 of JP1.
To perform the I
implemented on the 32L152CDISCOVERY. The solder bridges SB1, SB2 and SB14 must
be closed and JP1 must be ON.The low IDD range procedure (see
recommended when the MCU is in Low-power mode and the IDD current does not exceed
60 μA. The high IDD range procedure (see
operates in Run mode and can sink up to 30 mA.
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measurement circuit
DD
measurement by the MCU itself, the circuit shown in
DD
DocID018789 Rev 4
measurement circuit allows to measure the
DD
Section 4.7.1)is applicable when the MCU
measurement circuit
DD
measurement circuit is
DD
Figure 10 is
Section 4.7.2) is
UM1079