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DLPC900_V01 Datasheet(Hoja de datos) 68 Page - Texas Instruments

No. de Pieza. DLPC900_V01
Descripción  DLPC900 Digital Controller for Advanced Light Control
Descarga  83 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 68 page
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MOSC
MOSCN
C1
Crystal
RFB
RS
CL1
CL2
68
DLPC900
DLPS037D – OCTOBER 2014 – REVISED MARCH 2019
www.ti.com
Product Folder Links: DLPC900
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Figure 40. Crystal Oscillator Configuration
10.1.5 Spread Spectrum Clock Generator Support
DLPC900 supports limited, internally controlled, spread spectrum clock spreading on the DMD interface. The
purpose is to frequency-spread all signals on this high-speed external interface to reduce EMI emissions. Clock
spreading is limited to triangular waveforms. The DLPC900 provides modulation options of 0%, ±0.5%, and
±1.0% (center-spread modulation).
10.1.6 GPIO Interface
The DLPC900 provides 9 software-programmable, general-purpose I/O pins. Each GPIO pin is individually
configurable as either input or output. In addition, each GPIO output can be either configured as push-pull or
open-drain. Some GPIO have one or more alternative use modes, which are also software configurable. The
reset default for all GPIO is as an input signal. However, any alternative function connected to these GPIO pins,
with the exception of general-purpose clocks and PWM generation, will be reset. When configured as open-drain,
the outputs must be externally pulled-up (to the 3.3-V supply). External pullup or pulldown resistors may be
required to ensure stable operation before software can configure these ports.
10.1.7 General Handling Guidelines for Unused CMOS-Type Pins
To avoid potentially damaging current caused by floating CMOS input-only pins, it is recommended tying unused
controller input pins through a pullup resistor to its associated power supply or through a pulldown to ground
unless noted in the Pin Functions. For controller inputs with an internal pullup or pulldown resistor, it is
unnecessary to add an external pullup or pulldown unless specifically recommended. Internal pullup and
pulldown 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 to configure unused bidirectional I/O pins 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 pulled-down) using an appropriate resistor unless noted in the Pin Functions.




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