73S8023C Demo Board User Manual
UM_8023C_027
6
Rev. 1.3
2 Basic Connections
The basic connections to the demo board are described below and shown in Figure 2.
1. Connect power supply: Apply 3.3 V to pin 10 of J4.
2. Control signals to the device can be connected through J2 and J4 (see Figure 2 and the Electrical
Schematic,
Figure 5
).
3. To set the clock frequency with an external clock source:
•
Set JP1 to the SCLK setting.
•
Apply clock source to pin 1 of J2.
•
Apply 3.3V (1) or GND (0) to CLKDIV1 and CLKDIV2 pins to set the desired clock rate as follows:
CLKDIV1 = CLKDIV2 = 0
clock frequency = SCLK/8
CLKDIV1 = 0, CLKDIV2 =1
clock frequency = SCLK/4
CLKDIV1 = 1, CLKDIV2 =0 clock frequency = SCLK
CLKDIV1 = CLKDIV2 = 1
clock frequency = SCLK/2
4. To set the clock frequency using crystal Y1:
•
The crystal included on the demo board is 12 MHz.
•
Set JP1 to XTAL position.
•
Apply 3.3V (1) or GND (0) to CLKDIV1 and CLKDIV2 pins to set the desired clock rate as follows:
CLKDIV1 = CLKDIV2 = 0
clock frequency = 1.5 MHz
CLKDIV1 = 0, CLKDIV2 =1
clock frequency = 3 MHz
CLKDIV1 = 1, CLKDIV2 =0
clock frequency = 12 MHz
CLKDIV1 = CLKDIV2 = 1
clock frequency = 6 MHz
Figure 2: 73S8023C Demo Board Basic Connections
