OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

DEMO9S08EL32AUTO

P1-P3P4-P6P7-P9P10-P12P13-P14
DEMO9S08EL32 AUGUST 7, 2008
USER GUIDE
10
TIMING
The DEMO9S08EL32 is configured to use the target MCU’s internal clock source by default.
Space is provided for an external, 32 kHz XTAL oscillator; however, the external timing source
is not populated. The internal timing source is active out of RESET. Default configuration sets
the internal bus to run at 8.4MHz. The internal clock source is trimmable to ± 0.2%. Refer to
the MC9S08EL32 Data Sheet for further details.
COMMUNICATIONS
The DEMO9S08EL32 board applies a single Serial Communications Interface (SCI) port
configurable between either SCI or LIN functionality. RS-232 communications are supported
through a DB9 connector. LIN communications are supported through a pair of 4-pin Molex
connectors. A 2x3 option header selects the desired communications protocol.
RS-232
An RS-232 translator provides RS-232 to TTL/CMOS logic level translation on the COM
connector. The COM connector is a 9-pin Dsub, right-angle connector. A ferrite bead on
shield ground provides conducted immunity protection. Communication signals TXD and RXD
are routed from the transceiver to the MCU. Hardware flow control signals RTS and CTS are
available on the logic side of the transceiver. These signals are routed to vias located near the
transceiver. RTS has been biased properly to support 2-wire RS-232 communications.
Table 2 below details the SCI connections to the target MCU.
Table 2: COM Connections
MCU Port COM Signal I/O PORT
CONNECTOR
PTB1/PIB1/SLTXD/TXD/ADP5 TXD J1-5
PTB0/PIB0/SLRXD/RXD/ADP4 RXD J1-7
COM Connector
A standard 9-pin Dsub connector provides external connections for the SCI0 port. The Dsub
shell is connected to board ground through a ferrite bead. The ferrite bead provides noise
isolation on the RS-232 connection. Figure 4 below details the DB9 connector pin-out.
Figure 4: COM Connector
4, 6
1
6
1, 4
TXD
2
7
RTS
RXD
3
8
CTS
1, 6
4
9
NC
GND
5
Female DB9 connector that interfaces to the MCU internal SCI0 serial
port via the RS232 transceiver. Flow control is provided at test points on
the board.
Pins 1, 4, and 6 are connected together.
DEMO9S08EL32 AUGUST 7, 2008
USER GUIDE
11
LIN Communications
The DEMO9S08EL32 applies a fault tolerant, Local Interconnect Interface (LIN) physical layer
(PHY) for use in developing automotive control applications. The PHY supports LIN bus
functionality for input voltages between +12V and +18V. Only power applied to the PWR
connector or through the LIN bus enable LIN functionality. Two, 4-pin, Molex connectors
provide off-board connectivity. Figure 5 below shows the pin-out of the LIN connector looking
into the connector.
Figure 5: LIN Connector
LIN I/O
4 3
V
SUP
GND
2 1
GND
REF: Mating Connector, Molex P/N,
39-01-2040, Housing
39-00-0039, Socket
NOTE: +12V must be applied to the PWR connector when using the LIN functionality.
LIN_EN
The LIN_EN option header can be used to disable the LIN PHY under MCU control. The LIN
PHY is enabled by default if this header is removed. Figure 6 shows the LIN_EN shunt
positions.
Figure 6: LIN_EN Option Header
ON OFF
1 2
Enabled Disabled
VX_EN
COM_SEL
The COM_SEL option header connects the MCU SCI port to either the SCI PHY or the LIN
PHY. Figure 7 below shows jumper setting selecting between SCI or LIN signalling.
DEMO9S08EL32 AUGUST 7, 2008
USER GUIDE
12
Figure 7: COM_SEL Option
COM LIN
2 4 6
1 3 5
Select LIN communications
COM_SEL
COM LIN
5 3 1
6 4 2
Select COM communications
COM_SEL
USER I/O
User I/O includes 1 potentiometers, 1 Light Sensor, 2 push button switches, and 2 green LEDs
for user I/O. The User option header block enables or disables each User I/O function
individually. Table 3 and Figure 8 below show the USER enable position and associated
signals for each USER option.
Switches
The DEMO9S08EL32 provides 2 push button switches for user input. Each push button switch
provides an active low input with a pull-up resistor bias to prevent indeterminate input
conditions. Pressing a push-button switch causes a low logic input on the associated input.
Refer to Table 3 below.
LED’s
The DEMO9S08EL32 target board provides 2 green LEDs for output indication. Each LED is
an active low output. Writing a low logic level to an LED output causes the associated LED to
turn on. A series, current-limit resistor prevents excessive diode current. Refer to Table 3
below.
Potentiometer
The DEMO9S08EL32 target board provides a 5K ohm potentiometer (POT) to simulate analog
input. The POT is decoupled to minimize noise during adjustment. Potentiometer RV1
connects to analog input PTA0. Refer to Table 3 below.
P1-P3P4-P6P7-P9P10-P12P13-P14

DEMO9S08EL32AUTO

Mfr. #:
Buy DEMO9S08EL32AUTO
Manufacturer:
NXP / Freescale
Description:
Development Boards & Kits - S08 / S12 EL32 DEMO BOARD AUTO
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet