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Unused bidirectional signals can be configured as outputs in order to avoid floating controller inputs after

RESETZ is set high.

The following signals are forced to a logic low state while RESETZ is asserted and the corresponding I/O power

is applied:

• LED_SEL_0

• LED_SEL_1

• DMD_DEN_ARSTZ

After power is stable and the PLL_REFCLK_I clock input to the DLPC1438 controller is stable, then RESETZ

should be deactivated (set to a logic high). The DLPC1438 controller then performs a power-up initialization

routine that first locks its PLL followed by loading self configuration data from the external flash. Upon release of

RESETZ, all DLPC1438 I/Os will become active. Immediately following the release of RESETZ, the HOST_IRQ

signal will be driven high to indicate that the auto initialization routine is in progress. However, since a pullup

resistor is connected to signal HOST_IRQ, this signal will have already gone high before the controller actively

drives it high. Upon completion of the auto-initialization routine, the DLPC1438 controller will drive HOST_IRQ

low to indicate the initialization done state of the controller has been reached.

To ensure reliable operation, during the power-up initialization sequence, GPIO_08 (PROJ_ON) must not be

deasserted. In other words, once the startup routine has begun (by asserting PROJ_ON), the startup routine

must complete (indicated by HOST_IRQ going low) before the controller can be commanded off (by deasserting

PROJ_ON).

Note

No I2C or DSI (if applicable) activity is permitted until HOST_IRQ goes low.

9.4 DMD Fast Park Control (PARKZ)

PARKZ is an input early warning signal that must alert the controller at least 32 µs before DC supply voltages

drop below specifications. Typically, the PARKZ signal is provided by the DLPAxxxx interrupt output signal.

PARKZ must be deasserted (set high) prior to releasing RESETZ (that is, prior to the low-to-high transition on

the RESETZ input) for normal operation. When PARKZ is asserted (set low) the controller performs a Fast Park

operation on the DMD which assists in maintaining the lifetime of the DMD. The reference clock must continue

running and RESETZ must remain deactivated for at least 32 µs after PARKZ has been asserted (set low) to

allow the park operation to complete.

Fast Park operation is only intended for use when loss of power is imminent and beyond the control of the host

processor (for example, when the external power source has been disconnected or the battery has dropped

below a minimum level). The longest lifetime of the DMD may not be achieved with Fast Park operation.

The longest lifetime is achieved with a Normal Park operation (initiated through GPIO_08). Hence, PARKZ

is typically only used instead of a Normal Park request if there is not enough time for a Normal Park. A

Normal Park operation takes much longer than 32 µs to park the mirrors. During a Normal Park operation, the

DLPAxxxx keeps on all power supplies, and keeps RESETZ high, until the longer mirror parking has completed.

Additionally, the DLPAxxxx may hold the supplies on for a period of time after the parking has been completed.

View the relevant DLPAxxxx datasheet for more information. The longer mirror parking time ensures the longest

DMD lifetime and reliability. The DMD Parking Switching Characteristics section specifies the park timings.

9.5 Hot Plug I/O Usage

The DLPC1438 controller provides fail-safe I/O on all host interface signals (signals powered by VCC_INTF).

This allows these inputs to externally be driven even when no I/O power is applied. Under this condition, the

controller does not load the input signal nor draw excessive current that could degrade controller reliability.

For example, the I2C bus from the host to other components is not affected by powering off VCC_INTF to the

DLPC1438 controller. The allows additional devices on the I2C bus to be utilized even if the controller is not

powered on. TI recommends weak pullup or pulldown resistors to avoid floating inputs for signals that feed back

to the host.

DLPC1438

DLPS216A – JULY 2021 – REVISED AUGUST 2021

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DLPA2005 Datasheet(PDF) 42 Page - Texas Instruments

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