Silicon Laboratories C8051F064-EK, Руководство пользователя

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C 8 0 5 1 F 0 6 4 - E K
2 Rev. 0.4
The C8051F064EK has three purposes:
 Noise Performance Demonstration —Demonstrates 16-bit dc performance; displays FFT plot and key
parameters.
 Performance Evaluation —Facilitates easy programming and analog front end input for dynamic performance
evaluation of ac signals.
 Tools Test Drive —Allows easy evaluation of the Silicon Laboratories Integrated Development Environment
(IDE) (code download and on-chip debug function).
4. Evaluation Kit ADC Demo
The C8051F064 evaluation kit includes a demonstration of the noise performance of the 16-bit ADCs on the
C8051F064 device. A 1.25 V dc input signal is provided on the board as an input to the ADC input pins, AIN0 and
AIN1. The ADCs convert and store 32,768 samples (differential, 16-bit samples in 2s complement) in off-chip
SRAM. The PC application then downloads the data through the debug USB port. After processing these
conversions, the software generates a spectral plot (magnitude versus frequency) of the ADC input signal. The
spectral plot illustrates the C8051F064s noise floor for the given sample set. The minimum and maximum values
sampled, mean of values sampled, standard deviation, and dynamic range are displayed. To run the ADC Demo,
first configure the evaluation board and install the PC application.
4.1. ADC Demo Hardware Setup
Configure the evaluation board according to the instructions below. A diagram of the final configuration is shown in
Figure 2. Configuration shorting blocks may already be installed.
1. Place a shorting block on the J2 header connecting Pin 2 and Pin 3. This configures the evaluation board
to be powered from the DEBUG USB connector (J1).
2. Place a shorting block on the J4 header connecting Pin 2 and Pin 3. This configures the external voltage
reference to be powered from the DEBUG USB connector (J1).
3. Place shorting blocks on the "V+" (J6) and "V–" (J8) headers.
4. Configure SRAM(U5): Place shorting blocks on J11 and on J14 connecting Pin 2 and Pin 3.
5. Connect one end of the provided USB cable to any available USB port on the PC.
6. Connect the other end of the USB cable into the USB connector on the board labeled "DEBUG" (J1). This
connection should power the board. Evaluation board power is indicated by the "PWR" LED (D4).
Figure 2. ADC Demo Hardware Setup
J16
J11
J14
DATA
Pin 1
J4
J2
DEBUG
J5
C8051
F064
J12
J13
P3.6 RESET
Pin 1
Pin 2
PO
RT
0
J15
Pin 1
Pin 1
J1
J7
SRAM
ADC0
ADC1
J3
D1
P1.6 PWR
D3
D4
J4
Pin 1
D2
STOP/RUN
V+
V-
+3.3V
5VDD
J6
J8
USB Cable
To PC
USB Port