Silicon Laboratories C8051F35x User Manual page 8

C8051F35x-DK
6.5. Serial Interface (J5)
A RS232 transceiver circuit and DB-9 (J5) connector are provided on the target board to facilitate serial connec-
tions to UART0 of the C8051F350. The TX, RX, RTS and CTS signals of UART0 may be connected to the DB-9
connector and transceiver by installing shorting blocks on jumpers J3.
J3[7-8] - Install shorting block to connect UART0 TX (P0.4) to transceiver.
J3[9-10] - Install shorting block to connect UART0 RX (P0.5) to transceiver.
J3[11-12] - Install shorting block to connect UART0 RTS (P1.4) to transceiver.
J3[13-14] - Install shorting block to connect UART0 CTS (P1.5) to transceiver.
6.6. Analog I/O (J6)
Many of the C8051F350 target device's port pins are connected to the J6 terminal block. Connections for VDDA,
AGND, ADC external voltage refences, IDAC outputs and ADC inputs are available. Refer to Table 4 for the J6 ter-
minal block connections.
6.7. IDAC Connectors(J7, J11)
The C8051F350 target board also features two Current-to-Voltage 1 KΩ converting resistors that may be con-
nected to the 10-bit current-mode Digital-to-Analog Converters (IDACs) on port pins P1.6 and P1.7. Install a short-
ing block on J7 to connect the IDAC0/P1.6 pin of the target device to a converting resistor. Install a second shorting
block on J11 to connect the IDAC1/P1.7 pin of the target device to a converting resistor. The IDAC signals are then
routed to the J1 and J6 connectors.
6.8. Serial Adapter Target Board Power Connector (J8)
The Serial Adapter includes a connection to provide power to the target board. This connection is routed from
J4[10] to J8[1]. Place a shorting block at jumper J8[2-3] to power the board directly from an AC/DC power adapter.
Place a shorting block at jumper J8[1-2] to power the board from the Serial Adapter. Please note that the second
option is not supported with either the EC1 or EC2 Serial Adapters.
6.9. Thermistor Connector Block(J12)
A thermistor circuit is included on the board which allows for a ratiometric measurement of the included thermistor.
To use the circuit, remove the shorting blocks on the IDAC jumpers (J7, J11) and the External Voltage Reference
jumpers (J13, J14). Next, connect all of the signals on the thermistor connector block (J12). Software on the chip
can be written to use IDAC0 as a reference current source for the circuit. The current creates a voltage across R27
which is used as an external Voltage Reference input, while the voltage across the thermistor (R26) can be mea-
sured by connecting AIN0.0 to the AIN+ ADC input, and AIN0.1 to the AIN- ADC input.
8
Pin # Description
1 IDAC0
2 IDAC1
3 VREF+
4 VREF-
5 AIN0
6 AIN1
7 AIN2
Table 4. J6 Terminal Block Pin Descriptions
Rev. 0.1
Pin # Description
8 AIN3
9 AIN4
10 AIN5
11 AIN6
12 AIN7
13 AGND
14 VDDA