During
power-down, VDD and VDDI must be supplied until after VCC2
is discharged to within the specified limit of ground. Refer
to Section 5.4.
Power supply slew
rates during power-down are flexible, provided that the
transient voltage levels follow the requirements listed in
Section 5.1 and in Section 5.4.
During
power-down, LVCMOS input pins must be less than specified in
Section 5.4.
Figure 8-1 DMD Power
Supply Sequencing Requirements
A. See Pin
Configuration and Functions for pin functions.
B. VDD must be up
and stable prior to VCC2 powering up.
C. PWRDNZ has two
turn on options. Option 1: PWRDNZ does not go high until VDD
and VCC2 are up and stable, or Option 2: PWRDNZ must be
pulsed low for a minimum of TPWRDNZ, or 10ns
after VDD and VCC2 are up and stable.
D. There is a
minimum of TLVDS_ARSTZ, or
2μs,
wait time from PWRDNZ going high for the LVDS receiver to
recover.
E. After the DMD
micromirror park sequence is complete, the DLP controller
software initiates a hardware power-down that activates the
PWRDNZ and disables VCC2.
F. Under power-loss
conditions, where emergency DMD micromirror
park
procedures are being enacted by the DLP controller hardware,
PWRDNZ goes low.
G. VDD must remain
high until after VCC2 goes low.
H. To prevent excess
current, the supply voltage delta |VDDI – VDD| must be less
than specified limit in Section 5.4.