Figure 19. Digital Section Schematic - ST STM32L073Z-EVAL User Manual

UM1878
MFX_IRQOUT
PE6 can also be used to wake-up the MCU
RESET#
MFX_WKUP
Warning:

Figure 19. Digital section schematic

VDD
PE6
R166 0
VDD
R155
D8 [N/A]
TP27 [N/A]
TP26 [N/A] XN
TP29 [N/A]
C95
BAT60JFILM
[N/A]
R158
0
R157
100K
PB6
MFX_I2C_SCL
PB7
MFX_I2C_SDA
R169
10K
To avoid current injection from STM32 to components on the
board during IDD measurement it is strongly recommended
to keep V
DD_MCU
powered by 3.3 V so that, if V
current can be injected.
MFX
Multi Function eXpander
VDD
L7
BEAD
C90
C93
1uF
100nF
TP31
14
SPARE
[N/A]
10
TSC_XP/GPO0
XP
11
TSC_XN/GPO1
12
TSC_YP/GPO2
YP
13
TSC_YN/GPO3
R174
44
BOOT0
510 46
IRQOUT
7
NRST
2
WAKEUP
MFX_V3
34
MFX_SWDIO
SWDIO
37
MFX_SWCLK
SWCLK
R179 0 42
I2C_SCL
R177 0 43
I2C_SDA
45
I2C_ADDR
IDD_SH1/GPO5
21
USART_TX IDD_SH2/GPO6
22
USART_RX IDD_SH3/GPO7
IDD_CAL/GPO4
R176 [N/A]
IDD_VDD_MCU
≤ 3.3 V. Some components on the board are
DD_MCU
UM1878 Rev 2
Hardware layout and configuration
VDD one capacitor close to each MFX pins:
VDD, VDD_1, VDD_2, VDD_3
C106 C94 C116 C91
100nF 100nF 100nF 100nF
U25
STM32L152CCT6
MFX
18
GPIO0 JOY_SEL
MFX
19
GPIO1 JOY_DOWN
MFX
20
GPIO2 JOY_LEFT
MFX
39
GPIO3 JOY_RIGHT
MFX
40
GPIO4 JOY_UP
MFX
15
GPIO5 MFX_MicroSD_detect
16
GPIO6
17 R171 10K
GPIO7
29
GPIO8
30 R189 10K
GPIO9
31
GPIO10
32 R190 10K
GPIO11
33
GPIO12
26 R191 10K
GPIO13
27
GPIO14
28 R188 10K
GPIO15
4 SH0
IDD_SH0
5 SH1
6 SH2
38 SH3
3 CAL
25 IDD_MEAS
IDD_MEAS
41 R180 0
VDD_MCU
is higher than 3.3 V, a
C99
100nF
43/64
63