Schematic diagrams and bill of material
UM1619
52/56
DocID024383 Rev 1
SMD
VAC
1
U1
ST7540
FSK power line
transceiver
SMD
HTSSOP28
ST
1
U2
STM32F103
CBT7TR
32-bit MCU
SMD
LQFP48
ST
1
U3
ST3232CTR
3 to 5.5 V, low
power, up to 400
kbps RS-232
drivers and
receivers
SMD
TSSOP16
ST
1
U4
USBUF02W
6
EMI filter and
line termination
for USB
upstream ports
SMD
SOTT323-6
ST
1
Y1
16MHz
3
ppm/Y
ear
HC-49 SMD Euroquartz
1
Y2
32.768KHz
5
ppm/Y
ear
SMD
Citizen
QD
1
Y3
8MHz
3
ppm/Y
ear
HC-49 SMD Euroquartz
Table 1. Bill of material (continued)
Qty
Ref.
Part / value Tol. %
Voltage /
current
Watts
Technology
information
PA
Manufact.