AN2573 Freescale Semiconductor / Motorola, AN2573 Datasheet - Page 5

• Manufacturer Part Number: AN2573
• Description: LINkits LIN Evaluation Boards
• Manufacturer: Freescale Semiconductor / Motorola

Freescale Semiconductor, Inc.
AN2573/D
Hardware
The other slaves are very similar to the EY16. The 48-pin GR60 is intended for
use in high-end LIN nodes. It does not have an on-chip clock generator and
thus the PCB incorporates a crystal and its associated passive components.
The QY4 is aimed at low-end nodes and, like the EY16, has an on-chip clock
and thus does not require an external crystal. It has an additional jumper (J3)
to isolate PTA1 because it is required to be high for monitor mode entry. This
jumper should be fitted for normal use and removed only when entering monitor
mode.
The GZ60 master board is similar to the GR60 slave, but the GZ60 includes an
MC33388 CAN interface. The master boards also have a co-axial socket to
allow the connection of the 12-V power supply included in the accessory kit.
This is primarily intended for use with the demonstration application because
all the LIN kits boards have two 4-pin, 8-amp Molex connectors (LIN, 12 volts
and 2 grounds). These are intended for daisy-chaining multiple slaves but can
also be used to supply power.
The 9S12C32 master board is similar to the GZ60, but the MON08 interfaces
of the 9S12C32 are replaced by a 6-pin background debug mode (BDM)
connector. As a possible low-cost alternative to the use of the BDM interface,
the 9S12 PCB includes an RS-232 interface. This will, however, only be
convenient to use if the MCU fitted is an 9S12D64 (which has a second SCI)
rather than an 9S12C32.
All the HC08 PCBs have two debug interfaces which allow engineering use of
®
®
the boards in monitor mode. These are the 16-pin Cyclone
/MultiLink
interface and an RS-232 connection directly to the PC via a 9-pin D connector.
The RS-232 connection uses a level translator and an oscillator module. These
are powered up using the appropriate jumper (J3 for the EY16 board). This
jumper also supplies a pullup on the enable line to the MC33399 to prevent a
power down when the reset button is pressed in the absence of LIN activity.
With no LIN activity, the node would normally be powered down, but this jumper
prevents this from happening in debug mode. This debug jumper should also
be inserted when using the Cyclone/MultiLink interface. Although this supply
may not be required, applying 5 V to the RS-232 interface chip prevents
contention on PTA0 I/O line. The inclusion of the jumper also ensures that the
oscillator module, which can optionally be used in this mode, is powered up.
When using the RS-232 MON08 interface, 9 V is required on the IRQ pin in
order to enter monitor mode. To achieve this, the appropriate jumper (J2 on the
EY16 board) should be fitted. This mode also requires a clock source and an
additional jumper (J4 on the EY16 board) should be used to connect the
oscillator module to the OSC1 pin. This jumper is also required when using the
Cyclone/MultiLink interface with an external clock selected.
Cyclone
®
and MultiLink
®
are registered trademarks of P&E Microcomputer Systems, Inc.
MOTOROLA
LINkits LIN Evaluation Boards
5
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