STMicroelectronics Evaluation board for STM32L1 series - with STM32L152ZD MCU STM32L152D-EVAL STM32L152D-EVAL Data Sheet

Doc ID 18141 Rev 2

15/42

The built-in IDD measurement circuit implemented allows the consumption measurement of 
the STM32L152C6T6 while the MCU is in Run or Low power saving modes. 

For IDD measurement the circuit below is implemented on STM32L152-EVAL.

In Run mode, IDD current is measured using the operational amplifier MAX9938FEUK+ 
(U10) connected to the 1 Ohm shunt resistor (R36).

In this case IDD_CNT_EN remains high during measurement, so R35 remains in short-
circuit during the measurement because of transistor T4 which remains ON permanently. 
Jumper JP4 must be connected between pins 2 and 3.

In Low power modes (Stop or Standby), the operational amplifier MAX9938FEUK+ (U10) is 
connected to the 1 KOhm shunt resistor (R35), controlled by the analogue switch T4.

In this case the counter 74HC4060 (U6) enabled by IDD_CNT_EN manages the 
measurement timing according to 

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