To prevent excess current, the supply voltage
delta |VBIAS – VOFFSET| must be less than
specified in the Recommended Operating Conditions. OEMs may find that the most reliable way
to ensure this is to power VOFFSET prior to VBIAS
during power-up and to remove VBIAS prior to
VOFFSET during power-down. Also, the TPS99001-Q1 is capable of managing
the timing between VBIAS and VOFFSET.
To prevent excess current, the supply voltage
delta |VBIAS – VRESET| must be less than specified
than the limit shown in the Recommended Operating Conditions.
When system power is interrupted, the TPS99001-Q1 initiates hardware
power-down that disables VBIAS, VRESET, and
VOFFSET after the Micromirror Park Sequence.
LS_CLK and LS_WDATA signals are ignored until
DMD_DEN_ARSTZ is released.
The drawing is not to scale and details are
omitted for clarity. For example, the DLPC231-Q1 will read
information from DLP4621-Q1 during
initialization and activity on LS_CLK, LSWDATA,
and DMD_DEN_ARSTZ may toggle multiple times prior
to displaying information on DLP4621-Q1.
Figure 7-2 Power Supply Sequencing
Requirements (Power Up and Power Down)