Datasheet

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MT9D111__7_REV5.fm - Rev. B 2/06 EN
153 ©2004 Micron Technology, Inc. All rights reserved.
MT9D111 - 1/3.2-Inch 2-Megapixel SOC Digital Image Sensor
Start-Up and Usage
Micron Confidential and Proprietary
Figure 34: Hard Standby Sequence
Standby Hardware Configuration
While in standby, floating IO signals may cause the standby current to rise significantly.
Therefore, it is recommended that the following signals be maintained high or low dur-
ing standby and not floating: GPIO[11:0], D
OUT[7:0], PIXCLK, FRAME_VALID, and
LINE_VALID.
Output Enable Control
When the sensor is configured to operate in default mode, the DOUT, FRAME_VALID,
LINE_VALID, and PIXCLK outputs can be placed in High-Z under hardware or software
control, as shown in Table 38.
The pin transition between driven and High-Z always occurs asynchronously. Output-
enable control is provided as a mechanism to allow multiple sensors to share a single set
of interface pins with a host controller.
There
is no benefit in placing the pins in a High-Z while the part is in its low-power
standby state. Therefore, in single-sensor applications that use STANDBY to enter and
leave the standby state, programming R0x0D:0[6] = 1 is recommended.
Table 38: Output Enable Control
Standby
R0x0D:0[4]
(output_dis)
R0x0D:0[6]
(drive_pins) Output State
0 0 (default) 0 (default) Driven
1 0 (default) 0 (default) High-Z
“Don’t Care” 0 (default) 1 Driven
“Don’t Care” 1 “Don’t Care” High-Z
Power Up
Sequence
Completed
VDD, VDDQ,
VAA, VAAPIX
RESET#
CLKIN
SCLK/SDATA (SHIP)
STANDBY
When seq.state=3,
the sensor is back
in active state
Wait for
seq.state=9,
then bypass
PLL and set
all the
required
registers/
variables
described
Assert
STDBY
CLKIN
off
CLKIN
on
Reconfig output
and GPIO pads if
necessary, then
call seq.cmd=1
Wait for
seq.state=3,
then call
seq.cmd=3
De-
assert
STDBY
1 row-time
24-CLKIN
Low Power
State