SI5XX-PROG-EVB Datasheet, PDF (6/20 Pages) Silicon Laboratories – Windows-compatible software control and device programming

3.1. Power Supply
The Si5xx-PROG-EVB is pre-configured to accept 5 V from the USB connector at J2. The DUT is powered from
the VDD regulator by default, but could be changed to an external supply introduced through J1. To do this, simply
move jumper J11 from pins 2-3 to 1-2 and apply power to J1. (Ensure the voltage range of the DUT is obeyed, and
it is also good practice to set a current limit on the power supply).
It is also possible for the microcontroller (U9) to adjust the VDD regulator through the software. The microcontroller
has pull-downs configured at P0.0 and P0.1 that grounds R18 and R19, respectively, adjusting VDD_DUT to 1.8,
2.5, or 3.3 V. It is also possible to install jumpers in J5 to manually force a VDD_DUT voltage. Table 2 illustrates the
settings of J5:
Table 2. J5 settings for VDD_DUT
Jumper
VDD_DUT
Open
1–2
3–4
1.8 V
3.3 V
2.5 V
3.2. Reset Circuit
The Si5xx-PROG-EVB MCU may be reset by momentarily pressing pushbutton SW1.
3.3. USB
A 4-pin USB receptacle is provided at location J2. The Si5xx-PROG-EVB is compatible with USB Specification 2.0.
When the USB link is in use, the MCU drives LED D4.
3.4. MCU
The Silicon Laboratories MCU, P/N C8051F342, provides the following functions:
 Supports I²C communication to the DUT on behalf of the host PC per the Programmable Oscillator Software
 Drives a number of status indicator LEDs (see Table 3)
 Supplies 3.3 V to peripheral ICs on the motherboard but not to the DUT
 Controls DUT power (see Section “3.1. Power Supply” )
 Auto-detects the part type (e.g., Si51x/Si57x/Si59x)
There is a provision for in-circuit programming at connector J4. This provision should not be needed in normal
operation. The host PC operates the software and communicates to the Si5xx-PROG-EVB through the MCU via
USB connector J2. When the USB link is in use, LED D4 should flash. The MCU may be reset by momentarily
pressing pushbutton (SW1).
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Rev. 0.3