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DLPC900_V01 Datasheet(Hoja de datos) 29 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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 29 page
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DLPC900
DMD
uP
Power
Regulation
POSENSE
PWRGOOD
USB/I2C
PWRLOSS
Power
Loss
Detection
Circuit
Voltage
Monitor
DC Power Supplies
External Host Interface
AC/DC
Power
29
DLPC900
www.ti.com
DLPS037D – OCTOBER 2014 – REVISED MARCH 2019
Product Folder Links: DLPC900
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Copyright © 2014–2019, Texas Instruments Incorporated
6.7.2 Power-Down
PWRGOOD can not be used as an early warning signal. DMDs require an enhanced power down where the
DLPC900 performs a sequence of memory loads to the DMD followed by the mirror park instruction so that the
mirrors end up in an un-landed state.
There are two scenarios to consider when powering down DMDs supported by the DLPC900. Figure 3 shows a
power distribution layout for a typical system, which provides the mechanisms for both scenarios.
The first scenario is an anticipated power down, which is during a typical power down of the system. Figure 4
shows a timing diagram where an external host sends a power down command to the microprocessor (µP). The
µP must send a Power Standby command to the DLPC900. The DLPC900 then performs the necessary
power down sequence on the DMD. The power may be safely removed once the minimum tePH is met.
The second scenario is an unanticipated power loss. In this case a power loss detection circuit must provide a
means of triggering a power loss. Figure 5 shows a timing diagram where the power loss detection circuit detects
a power loss and asserts PWRLOSS to the µP. The µP must send a Power Standby command to the
DLPC900. The DLPC900 then performs the necessary power down sequence on the DMD. The power supplies
may be allowed to drop below their specifications once the minimum tePH is met.
Refer to the DLPC900 Programmer's Guide for a description of the Power Standby command.
Figure 3. Power Distribution Layout Example




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