STM32L152-EVAL STMicroelectronics, STM32L152-EVAL Datasheet - Page 18

• Manufacturer Part Number: STM32L152-EVAL
• Description: BOARD EVALUATION FOR STM32L
• Manufacturer: STMicroelectronics
• Type: MCUr

Specifications of STM32L152-EVAL

• New! Us2012 Catalog Page: STM8L-Discovery_STM32L152-EVAL
• Contents: Board
• Processor To Be Evaluated: STM32L1xxx
• Interface Type: UART
• Operating Supply Voltage: 2 V to 3.6 V
• For Use With/related Products: STM32L
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-10842

Hardware and layout
2.16.3
Note:
Note:
18/44
Ibias current measurement procedure
In Low power mode the bias current of operational amplifier input (U10 pin 4) is not
negligible compared to IDD current (typical Ibias is ~240 nA). To obtain a reliable MCU IDD
measurement it is possible to subtract the bias current from the IDD low power
measurement since this current is not sinked by the MCU.
The procedure for accurate IDD measurement is:
1.
2.
3.
4.
5.
Table 12.
When jumper JP4 is removed the current consumption of the STM32L can be measured by
connecting an ammeter between jumper JP4 pin 1 and pin 2.
RDS (on) typical value of analog switch T4 = 50 micro Ohm, so to improve measurement
accuracy it is recommended to take into account the RDS in series with R36 (1 Ohm) in the
Idd Run mode current calculation.
JP14
JP4
Jumper
Set jumper on JP4 pins 1 and 2.
Follow the Low power mode procedure to measure I1 = I bias.
Remove jumper on JP4 pins 1 and 2 and place it on JP4 pins 2 and 3.
Follow the low power mode procedure to measure I2 = IDD + I bias.
Calculate actual IDD: IDD = I2 - I1.
PA5 is connected to IDD_measurement, the output of IDD measurement circuit
when JP14 is closed (default).
PA5 is disconnected from IDD_measurement but remains connected to BNC
connector CN13 when JP14 is open.
STM32L is powered through IDD measurement circuit (default)
STM32L is powered directly by +3V3, IDD measurement circuit is bypassed.
Please refer to
IDD measurement related jumpers
Section 2.2: Power supply
Doc ID 18141 Rev 1
Description
for details.
Setting
UM1018
1
1
2
2
3
3