Digilent recommends that the included lens never be fully removed unless a different lens is being
swapped in. This will help prevent damage to the image sensor, which is very delicate. If swapping
in a different lens, the procedure should be done in a clean environment and the time in which the
image sensor is exposed should be minimized.
Power-up and Reset
The PWUP signal on the 15-pin FFC connector is used by the host to turn the Pcam 5C on and off. It
directly controls the power supplies found on the Pcam 5C, disconnecting power to the OV5640
when it is not driven high. The PWUP signal must be driven high in order to use the Pcam 5C.
The power-up sequence for the Pcam 5C includes a number of steps. These steps are implemented
in the source code for the Pcam 5C demo described in the Software Support section, however they
are also provided here for reference purposes:
1. Execute a power-cycle by applying a low pulse of 100ms on CAM_PWUP, then driving it
high.
2. Wait for 50ms.
3. Read sensor ID from registers 0x300A and 0x300B and check against 0x56 and 0x40,
respectively.
4. Choose system input clock from pad by writing 0x11 to register address 0x3103.
5. Execute software reset by writing 0x82 to register address 0x3008.
6. Wait for 10ms.
7. De-assert reset and enable power down until configuration is done by writing 0x42 to register
address 0x3008.
8. Choose system input clock from PLL by writing 0x03 to register address 0x3103.
9. Set PLL registers for desired MIPI data rate and sensor timing (frame rate).
10. Set imaging configuration registers.
11. Enable MIPI interface by writing either 0x45 for two-lane mode or 0x25 for one-lane mode to
register address 0x300E.
12. Let MIPI clock free-run, and force LP11 when no packet transmission by writing 0x14 to
register address 0x4800.
13. Set output format to RAW10 by writing 0x00 to register address 0x4300 and 0x03 to register
address 0x501F.
14. Wake up sensor by writing 0x02 to register address 0x3800.
The procedure above can be repeated at any time during execution to perform a reset on the
sensor.
Auxiliary Signals
The unloaded header labeled J3 on the Pcam 5C can be used to access some additional signals of
the OV5640. This is so that those with access to the OV5640 datasheet can use some of the
additional functionality they provide. These signals will not be useful to those without access to the
OV5640 datasheet, as they are otherwise undocumented. Most will not need to have any use for the
functionality provided on these signals, and their use is not required for normal function of the Pcam
5C.