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FN7740
Rev. 1.00
May 22, 2017
TW2835
4-Channel Video and Audio Controller for Security Applications
The TW2835 has four high quality NTSC/PAL video decoders, dual color display controllers and
dual video encoders. The TW2835 contains four built-in analog anti-aliasing filters, four 10bit
Analog-to-Digital converters, and proprietary digital gain/clamp controller, high quality Y/C separator
to reduce cross-noise and high performance free scaler. Four built-in motion, blind and night
detectors can increase the feature of security system. The TW2835 has flexible video
display/record/playback controller including basic display and MUX functions. The TW2835 also has
excellent graphic overlay function that displays bitmap for OSD, single box, 2D array box, and
mouse pointer. The built-in channel ID CODEC allows auto decoding and displaying during
playback and the additional scaler on the playback supports multi-cropping function of the same
field or frame image. The TW2835 contains two video encoders with three 10bit Digital-to-Analog
converters to provide 2 composite or S-video. The TW2835 also includes audio CODEC that has
four audio Analog-to-Digital converters and one Digital-to-Analog converter. A built-in audio
controller can generate digital outputs for recording/mixing and accepts digital input for playback.
The TW2835 can be extended up to 8/16 channel video controller using chip-to-chip cascade
connection.
Features
Four Video Decoders
Accepts all NTSC(M/N/4.43) / PAL(B/D/G/H/I/K/L/M/N/60) standards with auto detection
Integrated four video analog anti-aliasing filters and 10 bit CMOS ADCs
High performance adaptive 4H comb filters for all NTSC/PAL standards
IF compensation filter for improvement of color demodulation
Color Transient Improvement (CTI)
Automatic white peak control
Programmable hue, saturation, contrast, brightness and sharpness
High performance horizontal and vertical scaler for each path including playback input
Fast video locking system for non-realtime application
Four built-in motion detectors with 16X12 cells and blind and night detectors
Additional digital input for playback with ITU-R BT.656 standard
Auto cropping / strobe for playback input with Channel ID decoder
Supports four channel full D1 record mode
Dual Video Controllers
Support full triplex function with 4ch live, 4ch playback display and 4ch record output
Analog/Digital channel ID CODEC for record and playback application
Support adaptive median filter for Record
Supports pseudo 8 channel and/or dual page mode
Horizontal/Vertical mirroring for each channel
Last image captured when video-loss detected
Auto sequence switch with 128 queues and/or manual switch by interrupt for record path
Channel skip in auto sequence switch for record path when video-loss detected
Image enhancement for zoomed or still image in display path
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May 22, 2017
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TW2835
High performance 2X zoom to horizontal and vertical direction for display path
Extendable up to 8/16 channel video controller using cascade connection
Quad MUX switch with 32 queues and/or manual control by interrupt for record path
64 color bitmap OSD overlay with 720x480 in NTSC / 720x588 resolution in PAL
Four programmable single boxes and four 2D arrayed boxes overlay
Mouse pointer overlay
Dual Video Encoders
Dual path digital outputs with ITU-R BT.656 standard
Dual path analog outputs with all analog NTSC/PAL standards
Programmable bandwidth of luminance and chrominance signal for each path
Three 10bit video CMOS DACs
Audio CODEC
Integrated four audio ADCs and one audio DAC
Provides multi-channel audio mixed analog output
Supports a standard I2S interface for record output and playback input
8/16 bit audio word length
Sample audio with 8/16KHz
Applications
Analog QUAD/MUX System
4/8/16 Channel DVR System
Car Rear Vision System
Hair Shop System
Dental Care System
FN7740 Rev. 1.00
May 22, 2017
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TW2835
Table of Contents
Block Diagram .................................................................................................................................... 6
Pin Description ................................................................................................................................... 7
Analog Interface Pins .................................................................................................................... 7
Digital Video Interface Pins .......................................................................................................... 8
Multi-purpose Pins ........................................................................................................................ 9
Digital Audio Interface Pins .......................................................................................................... 9
Memory Interface Pins ................................................................................................................ 10
System Control Pins ..................................................................................................................... 11
Power / Ground Pins .................................................................................................................... 12
Pin Diagram ..................................................................................................................................... 13
Functional Description ..................................................................................................................... 15
Video Input................................................................................................................................... 15
Analog Video Input .................................................................................................................... 16
Anti-aliasing Filter ................................................................................................................. 17
Analog-to-Digital Converter .................................................................................................. 17
Sync Processing ..................................................................................................................... 18
Color Decoding ...................................................................................................................... 19
Luminance Processing ............................................................................................................ 21
Chrominance Processing ........................................................................................................ 22
Realtime Record Mode ........................................................................................................... 23
Digital Video Input .................................................................................................................... 24
Digital Video Input Format .................................................................................................... 24
Channel ID Decoder ............................................................................................................... 25
Cropping and Scaling Function .................................................................................................. 27
Cropping Function for Live .................................................................................................... 27
Scaling Function for Live ....................................................................................................... 27
Cropping and Scaling Function for Playback ......................................................................... 32
Motion Detection .......................................................................................................................... 33
Mask and Detection Region Selection ........................................................................................ 34
Sensitivity Control ..................................................................................................................... 35
Level Sensitivity .................................................................................................................... 35
Spatial Sensitivity .................................................................................................................. 35
Temporal Sensitivity .............................................................................................................. 35
Velocity Control ........................................................................................................................ 36
Blind Detection .......................................................................................................................... 38
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May 22, 2017
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TW2835
Night Detection .......................................................................................................................... 38
Video Control ............................................................................................................................... 39
Channel Input Selection ............................................................................................................. 40
Channel Operation Mode ........................................................................................................... 41
Live Mode .............................................................................................................................. 41
Strobe Mode ........................................................................................................................... 42
Switch Mode .......................................................................................................................... 44
Channel Attribute ....................................................................................................................... 47
Background Control ............................................................................................................... 47
Boundary Control ................................................................................................................... 47
Blank Control ......................................................................................................................... 47
Freeze Control ........................................................................................................................ 47
Last Image Captured .............................................................................................................. 48
Horizontal / Vertical Mirroring .............................................................................................. 48
Field to Frame Conversion ..................................................................................................... 48
Display Path Control .................................................................................................................. 49
Save and Recall Function ....................................................................................................... 49
Image Enhancement ............................................................................................................... 50
Zoom Function ....................................................................................................................... 50
Picture Size and Popup Control .............................................................................................. 51
Full Triplex Function ............................................................................................................. 52
Playback Path Control ................................................................................................................ 53
Frame Record Mode ............................................................................................................... 55
DVR Normal Record Mode .................................................................................................... 57
DVR Frame Record Mode ...................................................................................................... 58
Record Path Control ................................................................................................................... 60
Normal Record Mode ............................................................................................................. 61
Frame Record Mode ............................................................................................................... 62
DVR Normal Record Mode .................................................................................................... 63
DVR Frame Record Mode ...................................................................................................... 64
Noise Reduction ..................................................................................................................... 65
Channel ID Encoder ................................................................................................................... 66
Channel ID Information ......................................................................................................... 66
Analog Type Channel ID in VBI ............................................................................................ 69
Digital Type Channel ID in VBI ............................................................................................ 70
Digital Type Channel ID in Channel Boundary ...................................................................... 71
Chip-to-Chip Cascade Operation ............................................................................................... 72
Channel Priority Control ........................................................................................................ 72
120 CIF/Sec Record Mode ..................................................................................................... 74
240 CIF/Sec Record Mode ..................................................................................................... 75
480 CIF/Sec Record Mode ..................................................................................................... 76
Infinite Cascade Mode for Display Path ................................................................................. 77
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May 22, 2017
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TW2835
OSD (On Screen Display) Control ............................................................................................. 78
2 Dimensional Arrayed Box ................................................................................................... 78
Bitmap Overlay ...................................................................................................................... 81
Single Box.............................................................................................................................. 85
Mouse Pointer ........................................................................................................................ 85
Video Output ................................................................................................................................ 86
Timing Interface and Control ..................................................................................................... 87
Analog Video Output ................................................................................................................. 89
Output Standard Selection ...................................................................................................... 89
Luminance Filter .................................................................................................................... 90
Chrominance Filter................................................................................................................. 90
Digital-to-Analog Converter .................................................................................................. 90
Digital Video Output .................................................................................................................. 92
Single Output Mode ............................................................................................................... 92
Dual Output Mode .................................................................................................................. 94
Audio CODEC ............................................................................................................................. 95
Multi-Chip Operation ................................................................................................................. 96
Serial Audio Interface ................................................................................................................ 98
Analog Audio Output ............................................................................................................... 101
Host Interface ................................................................................................................................. 102
Serial Interface ........................................................................................................................... 103
Parallel Interface ....................................................................................................................... 105
Interrupt Interface ..................................................................................................................... 107
MPP Pin Interface ..................................................................................................................... 108
Control Register ......................................................................................................................... 109
Register Map ............................................................................................................................ 109
Recommended Value ............................................................................................................... 118
Register Description................................................................................................................. 123
Parametric Information .................................................................................................................. 244
DC Electrical Parameters .......................................................................................................... 244
AC Electrical Parameters .......................................................................................................... 246
Application Schematic .................................................................................................................... 250
Package Dimension ........................................................................................................................ 251
Revision History .............................................................................................................................. 253
FN7740 Rev. 1.00
May 22, 2017
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