LM8300-REF-01 National Semiconductor, LM8300-REF-01 Datasheet - Page 19

• Manufacturer Part Number: LM8300-REF-01
• Description: BOARD EVALUATION LM8300
• Manufacturer: National Semiconductor

Specifications of LM8300-REF-01

• Main Purpose: Interface, Touch Screen Controller
• Utilized Ic / Part: LM8300
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

Jumper settings
The board was designed to work with a voltage of 7-16V DC (J3). This voltage will be dropped
down to 5V for the LM8500 and 3V for the LM8300/8400 using the onboard regulator chip. For
proper operation, a jumper block must be placed on J7 pin 1 and 2. Current measurement can be
performed by removing the jumper block and inserting an ammeter between J7-1 and J7-2.
The controller is set to low power standby enabled by default. A jumper block must be place on
J12 in the J12-2 and J12-3 on the evaluation board for proper operation.
The controller has the external filter options enabled by default. The board has two kinds of
filter: active and passive. The active filter is based on an op-amp design and the passive filter is
a simple low pass RC filter. To set the board with active filter enabled, a jumper block must be
placed on J5-2 and J5-3; and between J4-2 and J4-3. To set the board with passive filter enabled,
a jumper block must be placed on J5-1 and J5-2; and between J4-1 and J4-2.
The touch screen panel that is enclosed with the board is design to plug into J20. If other
connectors are required, then additional connectors can be placed on J18, J19, and J8.
Three jumpers blocks must be placed on J1, position J1-3, J1-4, position J1-5, J1-6, and position
J1-7, J1-8.
The default jumper setting is shown in figure 1.
Fig. 1