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ST STM32L152-EVAL User Manual

ST STM32L152-EVAL
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Hardware and layout UM1018
16/44 Doc ID 18141 Rev 1
2.16 IDD measurement
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.
Figure 4. STM32L152-EVAL IDD measurement circuit
2.16.1 Run mode
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.
2.16.2 Low power mode
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 Figure 5.
IDD_Measurement
IDD_CNT_EN
IDD_WAKEUP
2
3
4
5
U9
SN74L VC1G04DCKT
I/O
1
O/I
2
GND
3
C
4
VCC
5
U12
SN74L VC1G66DCKT
VDD
R36
1[1%]
R35 1K[1%]
3
4
5
G
S
D
1
2
6
T4
FDC606P
3
4
5
G
S
D
1
2
6
T3
FDC606P
4
5
2
3
1
U10
MAX9938FEUK+
VDD
Q11
1
Q12
2
Q13
3
Q5
4
Q4
5
Q6
6
Q3
7
GND
8
Ctc
9
Rtc
10
RS
11
MR
12
Q8
13
Q7
14
Q9
15
VCC
16
U6
74LV4060PW
VDD
VDD
R26
10K
R33
10K
C25
1uF
VDD
VDD_MCU
C6
1nF
R18
15K
R17
30K
Oscillator frequency 30KHz
VDD
C7
100nF
PA0
PC13
PA5
1
2
3
JP4
-36
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ST STM32L152-EVAL Specifications

General IconGeneral
BrandST
ModelSTM32L152-EVAL
CategoryMotherboard
LanguageEnglish

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