SI5040-EVB Datasheet, PDF (3/24 Pages) Silicon Laboratories – Four selectable on-chip reference frequencies

Si5040-EVB
1. Functional Description
The Si5040-EVB and software allow for a complete and
simple evaluation of the functions, features, and
performance of the Si5040 transceiver.
1.1. Input Power
This evaluation board requires three power inputs,
+1.8 V, +3.3 V, and V_DDIO(1.8 V or 3.3 V), as well as a
ground connection. J8 and J9 are used for connecting
power to the EVB (see Figure 1).
1.2. LEDs
Three LEDs indicate that power has been properly
applied to the EVB. These are +3.3 V, V_DDIO, and
+1.8 V. Since these LEDs are driven by the MCU (not
the power itself), the V_DDIO and +1.8 V LEDs will not
function unless +3.3 V is first applied to the EVB (see
Figure 1).
The 3.3 V LED will be on solid when the 3.3 V input is
within the 2.97 to 3.63 V range. The 1.8 V LED will be
on solid when the 1.8 V at the Si5040 V_DD pins is within
the 1.62 to 1.89 V range.
The V_DDIO LED will be on solid when this input voltage
is between 1.89 and 3.63 V. The V_DDIO LED will flash on
and off when this voltage is between 1.62 and 1.89 V.
The REF ON LED indicates that the Si534 clock
reference chip is powered up and applying a clock
signal to the Si5040. JP16 must be set to the ON
position in order to power up the Si534.
Table 1. LED Status and Description
LED
Status
Description
3.3 V
ON
When 3.3 V supply is between
2.97 and 3.63 V.
1.8 V
ON
When Si5040 V_DD pins are
between 1.62 and 1.89 V.
VDDIO
ON
When Si5040 V_DDIO pin is
between 1.89 and 3.63 V.
FLASHING
When Si5040 V_DDIO pin is
between 1.62 and 1.89 V.
REF
ON
ON
When the Reference clock
source Si534 is powered up.
USB
ON
Flashes when USB Access is
occurring.
SPSEL
ON
When the Si5040 SPSEL pin is
high.
INTRPT
ON
When the Si5040 INTRPT pin
is high.
RXLOS
ON
When the Si5040 RXLOS pin
is high.
RXLOL
ON
When the Si5040 RXLOL pin is
high.
Since the 1.8 V LED indicates the voltage at the Si5040
V_DD pins, the jumper, JP12, must be in place for this
LED to function and for the Si5040 to receive its core
supply voltage. However, the V_DDIO LED will function
without the jumper on JP13.
Figure 1. LED
1.3. Jumpers and Headers
For the EVB to function, there are five jumpers that
must be installed.
There must be jumpers on JP12 and JP13 because
they apply power to the Si5040 (see Figure 2). The next
three required jumpers are three positions on J17,
labeled SS, SD, and SCK on one side and SS_U,
SD_U, and SCK_U on the other side (see Figure 3).
Connecting jumpers between SS to SS_U, SD to SD_U,
and SCK to SCK_U enables the onboard MCU to
communicate with the Si5040 using the 3-wire serial
interface.
Figure 2. JP12 and JP13
Figure 3. J17
Rev. 0.4
3