4.2
Microcontroller power management
The JP34 allows selecting the voltage level to supply VDD_HV_IO_main (5 V or 3.3 V); as well as JP35 sets the
VDD_HV_IO_Flex level. The JP36 sets the VDD_HV_ADC supply level; JP37 sets the 3.3 V source (from linear
or switching regulator). These jumpers allow the evaluation of the current absorption.
The LEDs D5, D6, D7 and D8 provide feedback about the status of the power supply section.
Figure 5.
Power supply selector and LEDs
R79
2,2kΩ
V_Ext
1
2
3
JP34
Header 3x1
5V
3V3
VDD_HV_IO_Main
1
2
3
JP35
Header 3x1
LD5
3V3_LR
R76
470Ω
GND
3V3_LR
1
2
3
JP37
Header 3x1
1
2
3
JP36
Header 3x1
VDD_HV_ADC
3V
3_
Se
l
LD6
3V3
R77
470Ω
LD7
5V
R78
1kΩ
LD8
V_Ext
VDD_HV_IO_Flex
VDD_HV_IO_Main
VDD_HV_IO_Flex
VDD_HV_ADC
4.3
Integrated programmer/debugger
The integrated programmer/debugger allows the user to program the microcontroller, build, and debug the
software applications. The debugger works with the UDE PLS software.
The debugger serial number is a label applied on the PCB bottom side.
The integrated debugger SW is accessible via ST's free integrated development environment, SPC5Studio
(www.st.com/spc5studio). To download the debugger software and activate the license refer to the PLS website.
The core of the debugger is a single chip USB to dual serial/parallel ports. A portion of the device manages the
JTAG signals while the second part implements a UART communication channel; the level shifters are necessary
to balance the signals levels (3.3 V↔5 V).
The supply comes from the PC through the USB cable and a dedicated 3.3 V linear regulator supplies this
section.
The microcontroller can be programmed and debugged also by using external tools connected to a JTAG port
(2x7 pin). The solder jumper from SB8 to SB14 allows disconnecting the JTAG signal from the integrated
debugger.
Note:
An external debugger must be used with the USB cable disconnected and under this working condition; the
integrated debugger is not supplied. If the external programmer does not work properly, the jumpers SB8÷SB14
must be removed (open). It is suggested to perform some tests before removing the jumpers SB8÷SB14.
The SPC584B-DISP comes with the integrated programmer enabled (all solder jumpers from SB8 to SB14 are
present).
UM2462
Microcontroller power management
UM2462
-
Rev 3
page 6/25
