DLPC3470 datasheet(5/70 Pages) TI1

5 / 70 page

DLPC3470

www.ti.com

DLPS110 – APRIL 2018

Product Folder Links: DLPC3470

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(1)

If operation does not call for an external pullup and there is no external logic that might overcome the weak internal pulldown resistor,

then this I/O can be left open or unconnected for normal operation. If operation does not call for an external pullup, but there is external

logic that might overcome the weak internal pulldown resistor, then an external pulldown resistor is recommended to ensure a logic low.

(2)

External pullup resistor must be 8 kΩ, or less, for pins with internal pullup or down resistors.

(3)

If operation does not call for an external pullup and there is no external logic that might overcome the weak internal pulldown resistor,

then the TSTPT I/O can be left open/ unconnected for normal operation. If operation does not call for an external pullup, but there is

external logic that might overcome the weak internal pulldown resistor, then an external pulldown resistor is recommended to ensure a

logic low.

Pin Functions – Board Level Test, Debug, and Initialization

I/O

DESCRIPTION

NAME

NUMBER

HWTEST_EN

C10

Manufacturing test enable signal. This signal should be connected directly to ground on the

PCB for normal operation.

PARKZ

C13

DMD fast PARK control (active low Input) (hysteresis buffer). PARKZ must be set high to

enable normal operation. PARKZ should be set high prior to releasing RESETZ (that is, prior to

the low-to-high transition on the RESETZ input). PARKZ should be set low for a minimum of 32

µs before any power is removed from the DLPC3470 controller such that the fast DMD PARK

operation can be completed. Note for PARKZ, fast PARK control should only be used when

loss of power is eminent 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 the fast PARK operation. The

longest lifetime is achieved with a normal PARK operation. Because of this, PARKZ is typically

used in conjunction with a normal PARK request control input through GPIO_08. The difference

being that when the host sets PROJ_ON low, which connects to both GPIO_08 and the

DLPA2000 device PMIC device , the DLPC3470 controller takes much longer than 32 µs to

park the mirrors. The DLPA2000 device holds on all power supplies, and maintains the

RESETZ voltage high, until the longer mirror parking has completed. This longer mirror parking

time, of up to 500 µs, ensures the longest DMD lifetime and reliability.

The DLPA2000 device monitors power to the DLPC3470 controller and detects an eminent

power loss condition and drives the PARKZ signal accordingly.

Reserved

P12