Datasheet
Table Of Contents
- applications
- features
- key specifications
- table of contents
- list of figures
- list of tables
- 1 signal descriptions
- 2 system level description
- 3 block level description
- 4 image sensor core digital functions
- 4.1 mirror and flip
- 4.2 image windowing
- 4.3 test pattern
- 4.4 50/60Hz detection
- 4.5 AEC and AGC algorithms
- 4.6 AEC/AGC steps
- 4.7 black level calibration (BLC)
- 4.8 strobe flash and frame exposure
- 4.9 xenon flash control
- 4.10 frame exposure (FREX) mode
- 4.11 FREX strobe flash control
- 4.12 one-time programmable (OTP) memory
- 5 image sensor processor digital functions
- 6 image sensor output interface digital functions
- 7 register tables
- table 7-1 system control registers (sheet 1 of 5)
- table 7-2 SCCB registers (sheet 1 of 2)
- table 7-3 group hold control registers
- table 7-4 AEC/AGC 1 registers
- table 7-5 system timing registers (sheet 1 of 3)
- table 7-6 AEC/AGC 2 registers (sheet 1 of 3)
- table 7-7 STROBE/frame exposure control registers (sheet 1 of 2)
- table 7-8 50/60 HZ DETECTION registers
- table 7-9 OTP control registers (sheet 1 of 2)
- table 7-10 BLC registers (sheet 1 of 3)
- table 7-11 frame control registers
- table 7-12 DVP registers (sheet 1 of 2)
- table 7-13 MIPI top registers (sheet 1 of 11)
- table 7-14 ISPFC registers
- table 7-15 ISP TOP control registers (sheet 1 of 6)
- table 7-16 AWB registers (sheet 1 of 3)
- table 7-17 average registers (sheet 1 of 2)
- table 7-18 DPC registers
- table 7-19 LENC registers (sheet 1 of 4)
- table 7-20 cluster DPC registers (sheet 1 of 2)
- table 7-21 windows registers
- table 7-22 AEC/AGC 3 registers
- 8 operating specifications
- 9 mechanical specifications
- 10 optical specifications
- revision history
Confidential for truly Only
11.03.2009 PRELIMINARY SPECIFICATION proprietary to OmniVision Technologies
4-17
4.10 frame exposure (FREX) mode
4.10.1 FREX control
In FREX mode, whole frame pixels start integration at the same time, rather than integrating row by row. After the
user-defined exposure time (0x3B01, 0x3B04, 0x3B05), the shutter closes, preventing further integration and the image
begins to read out. After the readout finishes, the shutter opens again and the sensor resumes normal mode, waiting for
the next FREX request.
The OV5647 supports two modes of FREX (see figure 4-13):
• mode 1: Frame exposure and shutter control requests come from the external system via the FREX pin. The sensor
will send a strobe output signal to control the flash light
• mode 2: Frame exposure request comes from the external system via the SCCB register 0x3B08[0]. The sensor
will output two signals, shutter control signal through the FREX pin and strobe signal through the STROBE pin
figure 4-13 FREX modes
In mode 1, the FREX pin is configured as an input while it is configured as an output in mode 2. In both mode 1 and mode
2, the strobe output is irrelevant with the rolling strobe function. When in rolling shutter mode, the strobe function and
this FREX/shutter control function do not work at the same time.
sensor
FREX
STROBE
mode 1
sensor
FREX
STROBE
SCCB
mode 2
5647_DS_4_13