SI57X-EVB Silicon Laboratories Inc, SI57X-EVB Datasheet - Page 4

• Manufacturer Part Number: SI57X-EVB
• Description: MCU, MPU & DSP Development Tools Si570/Si571 Eval Board
• Manufacturer: Silicon Laboratories Inc

Specifications of SI57X-EVB

• Processor To Be Evaluated: Si570, Si571, C8051F320
• Interface Type: USB, I2C
• Operating Supply Voltage: 1.8 V to 3.3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si57x-EVB
1.3. Reset Circuit
The Si57x-EVB MCU may be reset by pressing momentary pushbutton SW1. It may also be held in reset by
installing a jumper at J7. MCU outputs are open drain and are tri-stated during reset. They remain tri-stated unless
otherwise directed under program control.
There is no hardware reset for the Si57x/598/599 itself. The Si57x/598/599 is reset only on power-up or through
software. Pressing the Si57x-EVB motherboard pushbutton SW1 in an attempt to reset the Si57x/598/599 may
result in unexpected behavior.
1.4. USB
A 4-pin USB receptacle is provided at location J15. The Si57x-EVB, via the MAC’s USB Function Controller, is
compatible with USB Specification 2.0. When the USB link is in use the MCU drives LED D7.
1.5. MCU
The MCU, Silicon Laboratories P/N C8051F320, provides the following functions:



The MCU comes pre-loaded with firmware. While there is a provision for in-circuit programming at connector J12
located on the back, this should not be necessary. The host PC operates the Si57x/598/599 software and
communicates to the Si57x/598/599 through the MCU via USB connector J15. When the USB link is in use, LED
D7 should be illuminated.
As mentioned earlier, the MCU may be reset by pressing momentary pushbutton (SW1) or held in reset by
installing a jumper at J7.
1.5.1. Status Signals
There are seven LEDs on the Si57x-EVB that report visual status as listed in Table 2 and as highlighted in Figure 2.
Upon power up, D1–D2 and only one of D3–D5 should be illuminated. D6 and D7 are only illuminated when in use.
4
Supports I
Drives a number of status indicator LEDs (see Table 2)
Supplies 3.3 V to peripheral ICs on the motherboard but not to the DUT
2
Designation
C communication to the DUT on behalf of the host PC per the Si57x-EVB software
Reference
D1
D2
D3
D4
D5
D6
D7
Green OE active
Green USB active
Color
Red
Red
Red
Red
Red
5 V present
MCU 3.3 V present
VREG 3.3 V selected
VREG 2.5 V selected
VREG 1.8 V selected
Signal or Status Indicated
Table 2. Si57x-EVB LEDs
Rev. 0.2
Connected to filtered 5 V
Under MCU control
Connected to MCU 3.3 V output
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