DLPC6421 datasheet(32/48 Pages) TI1

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CL = Crystal load capacitance (Farads)

CL1 = 2 * (CL ± CStray-MOSC)

CL2 = 2 * (CL ± CStray-MOSCN)

CStray-MOSC = Sum of Package & PCB capacitance at the crystal

pin associated with ASIC signal MOSC.

CStray-MOSCN = Sum of Package & PCB capacitance at the crystal

pin associated with ASIC signal MOSCN.

MOSC

MOSCN

CL1

CL2

RFB

DLPC6421

DLPS117 – JULY 2018

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Product Folder Links: DLPC6421

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Table 8. Recommended Crystal Configuration (continued)

PARAMETER

RECOMMENDED

UNIT

(1)

Typical drive level with the XSA020000FK1H-OCX Crystal (ESRmax = 40 Ω) = 50 µW.

Crystal frequency temperature stability

+/- 30

PPM

Overall crystal frequency tolerance (including

accuracy, stability, aging, and trim sensitivity)

+/- 100

PPM

Crystal Equivalent Series Resistor (ESR)

50 max

Crystal load

Crystal shunt load

7 max

RS drive resistor (nominal)

100

RFB feedback resistor (nominal)

MΩ

CL1 external crystal load capacitor (MOSC)

See (1)

CL2 external crystal load capacitor (MOSCN)

See (1)

PCB layout

TI recommends a ground isolation ring

around the crystal oscillator.

Figure 12. Recommended Crystal Oscillator Configuration

It is assumed that the external crystal oscillator will stabilize within 50 ms after stable power is applied.

8.2.2 Detailed Design Procedure

For connecting the DLPC6421 controller and the DLP470TP DMD together, see the reference design schematic.

Layout guidelines should be followed to achieve a reliable projector. To complete the DLP system, an optical

module or light engine is required that contains the DLP470TP DMD, associated illumination sources, optical

elements, and necessary mechanical components.

8.2.3 General Handling Guidelines for Unused CMOS-type Pins

To avoid potentially damaging current caused by floating CMOS input-only pins, it is recommended that unused

ASIC input pins be tied through a pull-up resistor to its associated power supply or a pull-down to ground. For

DLPC6421 inputs with an internal pull-up or pull-down resistors, it is unnecessary to add an external pull-up/ pull

down unless specifically recommended. Note that internal pull-up & pull-down resistors are weak and should not

be expected to drive the external line.

Unused output-only pins can be left open. When possible, it is recommended that unused Bi-directional I/O pins

be configured to their output state such that the pin can be left open. If this control is not available and the pins

may become an input, then they should be pulled-up (or down) using an appropriate resistor

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