Datasheet

JP7

VDD33

JP7

VDD_EXT

Draft

Indicators

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• S2/S3 (IDx Select Inputs): Select required I2C address level for IDx input. Set only one switch to ‘L’

(0x18 is default address).

• SW1 (PDB Reset Button): PDB pull-down switch. Press to perform a DS90UB927Q (U1) device PDB

reset.

• SW2 (Onboard I2C Bridge Reset): Press to reset the onboard USB-to-I2C bridge controller.

3.9 Indicators

The INTB interrupt state may be observed from the on-board LED indicator. The LED turns off when an

interrupt is indicated (INTB = LOW).

3.10 Input/Output Connectors

The following jumpers and connectors are provided on the board:

• J1/J2 FPD-Link III SMA Output (optional) – These optional outputs may be used to evaluate the

FPD-Link III serial link with different STP or micro-coax configurations. To use, remove J4 and

populate R3 and R4 with 0Ω resistors.

• J3 20-pin FPD-Link (I) Input – Connect LVDS data and clock here. Required 100Ω terminations are

located on-board near U1. See DS90UB927Q device datasheet for input electrical characteristics and

requirements.

• J4 FPD-Link III HSD Automotive Output – Connect to automotive-grade STP cable here. Remove

the connector if the SMA outputs (J1/J2) are to be used.

• J5 4-pin I2C Input/Output – Connect SDA, SCL, VSS, and VDD33 to external I2C peripherals or

controls here. The EVM board provides the recommended 4.7KΩ pull-up resistors.

• J6 USB Connector for USB-to-I2C Controller – Connect USB cable to host PC to use EVM board

with ALP evaluation software.

• J7 5V External Power Input (optional) – Connect +5V center-positive 2.1mm barrel connector here

to supply board power. Onboard regulators will supply the board with 3.3V VDDIO and 3.3V/1.8V

VDDIO supplies. Do not connect J8/J9 if this connector is used.

• J8 +3.3V VDD33 Power Input – Connect to 3.3V power supply.

• J9 VSS Power – Connect to system GND.

• JP1/JP2 Reserved – Do not populate or connect to external inputs/outputs

• JP3 I2S/GPIO Input/output Header – Connect to I2S input pins or bidirectional GPIO pins. See

DS90UB927Q datasheet for detailed I2S and GPIO usage.

• JP4 VDD_I2C Power Enable – Short to provide 3.3V power to on-board I2C pull-ups.

• JP5 Reserved – Do not short or connect to external inputs/outputs

• JP6 VDDIO_EXT Power Input – Connect to independent external VDDIO supply if VDDIO = 1.8V

• JP7 VDDIO Select – Connect jumper to select VDDIO=VDD33 [2-3] or VDDIO=VDDIO_EXT [1-2]

Figure 3-2. VDDIO Select (JP7) Jumper Settings

• JP8 INTB Interrupt Output – Monitor INTB status or connect to external device utilizing link interrupt

options. See DS90UB927Q datasheet for additional details on INTB options

• JP9 Reserved – Do not populate or connect to external inputs/outputs

Evaluation Hardware Overview SNLU125–November 2012

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