DATASHEET
TW2837
4-Channel Video and Audio Controller for Security Applications
The TW2837 has four high quality NTSC/PAL video
decoders, dual color display controllers and dual video
encoders. The TW2837 contains four built-in analog
anti-aliasing filters, four 10-bit 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
security system feature.
The TW2837 has flexible video
display/record/playback controller including basic
display and MUX functions. The TW2837 also has
excellent graphic overlay function, which 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 TW2837 contains two video encoders with three
10-bit Digital-to-Analog converters to provide 2
composite or S-video. The TW2837 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 TW2837 can be extended up to 8/16
channel video controller using chip-to-chip cascade
connection.
FN7742
Rev. 1.00
August 28, 2012
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
Proprietary fast video locking system for non-real-
time application
High performance horizontal and vertical scaler for
each path including playback input
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
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August 28, 2012
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TW2837
DUAL VIDEO CONTROLLERS
Supports full triplex function with 4 Ch live, 4 Ch
playback display and 4 Ch record output
Analog/Digital channel ID CODEC for record and
playback applications
Supports 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
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
256 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
Supports a standard I
2
S interface for record output
and playback input
PCM 8/16-bit and u-Law/A-Law 8-bit for audio word
length
Programmable audio sample rate that covers
popular frequencies of 8/16/32/44.1/48kHz
Changes from TW2835
TW2837 is very similar to its previous version chip
TW2835. The changes are as follows.
Provides higher quality video picture with a
complete re-design of front-end video decoders
Provides a new audio decoder with better audio
quality and also an extra audio PLL for accurate
8kHz/16kHz sampling rate
An enhanced OSD with 256 color look up table
Provides OSD Block Move / Block Fill / Bitmap Burst
Write function to enhance the OSD buffer write
performance. With these functions, MCU is relieved
from filling the OSD buffer pixel by pixel, therefore
achieving much faster OSD buffer update rate
Maintains backward compatibility to TW2835 on the
OSD features. All previous OSD control registers are
still available. To use the new feature, however, the
SAVE/RECALL feature is limited to 3 frames / 6
fields rather than 4 frames / 8 fields as was in
TW2835
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 10-bit video CMOS DACs
Applications
Analog QUAD/MUX System
4/8/16 Channel DVR System
Car Rear Vision System
Hair Shop System
Dental Care System
AUDIO CODEC
Integrated four audio ADCs and one audio DAC
Provides multi-channel audio mixed analog output
FN7742 Rev. 1.00
August 28, 2012
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TW2837
Table of Contents
Order Information ................................................................................... 5
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
208 QFP Pin Diagram (Top -> Bottom View) ......................... 13
256 LBGA Pin Diagram (Top->Bottom View) ......................... 14
Functional Description.......................................................................... 15
Video Input ................................................................................. 15
Analog Video Inputs.......................................................................................16
Video Input Formats ........................................................ 16
Analog Video Frontend .................................................... 17
Video Decimation Filter ................................................... 18
Automatic Gain Control and Clamping .......................... 18
Sync Processing ............................................................... 18
Y/C Separation ................................................................. 19
Color Decoding ................................................................. 20
Chrominance Processing ................................................ 21
Luminance Processing .................................................... 21
Digital Video Input ..........................................................................................23
Digital Video Input Format .............................................. 23
Channel ID Decoder ......................................................... 24
Cropping and Scaling Function ..................................................................25
Cropping Function for Live .............................................. 25
Scaling Function for Live ................................................. 26
Cropping and Scaling Function for Playback ................ 30
Motion Detection ...................................................................... 31
Mask and Detection Region Selection ....................................................32
Sensitivity Control ...........................................................................................33
Level Sensitivity................................................................ 33
Spatial Sensitivity ............................................................ 33
Temporal Sensitivity ........................................................ 33
Velocity Control................................................................................................34
Blind Detection ................................................................................................36
Night Detection................................................................................................36
Video Control ............................................................................. 37
Channel Input Selection............................................................................... 38
Channel Operation Mode ............................................................................ 39
Live Mode ......................................................................... 39
Strobe Mode ..................................................................... 40
Switch Mode ..................................................................... 42
Channel Attribute ........................................................................................... 46
Background Control ......................................................... 46
Boundary Control ............................................................. 46
Blank Control ................................................................... 46
Freeze Control .................................................................. 46
Last Image Captured ....................................................... 47
Horizontal / Vertical Mirroring ....................................... 47
Field to Frame Conversion .............................................. 47
Display Path Control...................................................................................... 47
Save and Recall Function ............................................... 47
Image Enhancement ....................................................... 48
Zoom Function ................................................................. 48
Picture Size and Popup Control ..................................... 49
Full Triplex Function ........................................................ 49
Playback Path Control.................................................................................. 50
Normal Record Mode ...................................................... 51
Frame Record Mode ........................................................ 52
DVR Normal Record Mode .............................................. 54
DVR Frame Record Mode ............................................... 55
Record Path Control ........................................................ 56
Normal Record Mode ...................................................... 57
Frame Record Mode ........................................................ 58
DVR Normal Record Mode .............................................. 59
DVR Frame Record Mode ............................................... 60
Noise Reduction ............................................................... 61
Channel ID Encoder....................................................................................... 61
Channel ID Information................................................... 62
Analog Type Channel ID in VBI ....................................... 64
Digital Type Channel ID in VBI........................................ 66
Digital Type Channel ID in Channel Boundary .............. 67
Chip-to-Chip Cascade Operation................................................................ 67
Channel Priority Control .................................................. 68
120 CIF/Sec Record Mode ............................................. 70
240 CIF/Sec Record Mode ............................................. 71
480 CIF/Sec Record Mode ............................................. 72
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August 28, 2012
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TW2837
Infinite Cascade Mode for Display Path ........................ 73
OSD (On Screen Display) Control...............................................................74
2 Dimensional Arrayed Box ............................................ 75
Bitmap Overlay ................................................................. 76
Single Box ......................................................................... 81
Mouse Pointer .................................................................. 82
Video Output .............................................................................. 83
Timing Interface and Control ......................................................................83
Analog Video Output......................................................................................85
Output Standard Selection .............................................. 85
Luminance Filter .............................................................. 85
Chrominance Filter .......................................................... 86
Digital-to-Analog Converter ............................................. 86
Digital Video Output .......................................................................................88
Single Output Mode ......................................................... 88
Dual Output Mode ............................................................ 90
Realtime Record Mode ................................................................................90
Audio Codec ............................................................................... 91
Audio Decimation Filter Response ...........................................................92
Audio Clock Master/Slave mode ..............................................................92
Multi-Chip Operation......................................................................................93
Serial Audio Interface....................................................................................97
Playback Input .................................................................. 97
Record Output .................................................................. 98
Mix Output ........................................................................ 99
Audio Clock Generation ............................................................................... 99
Host Interface ..................................................................................... 100
Serial Interface ....................................................................... 101
Parallel Interface .................................................................... 103
Interrupt Interface .................................................................. 104
MPP Pin Interface .................................................................. 105
Control Register ...................................................................... 106
Register Map ................................................................................................ 106
Recommended Value ............................................................................... 114
For Video Decoder ......................................................... 114
For Video Controller ....................................................... 117
For Motion Detector ...................................................... 119
Register Description ............................................................... 120
Parametric Information ..................................................................... 220
DC Electrical Parameters ...................................................... 220
AC Electrical Parameters ....................................................... 221
Application Schematic....................................................................... 228
Package Dimension ........................................................................... 229
208 QFP ................................................................................... 229
256 LBGA ................................................................................ 231
Revision History .................................................................................. 232
FN7742 Rev. 1.00
August 28, 2012
Page 4 of 232
TW2837
Ordering Information
PART
NUMBER
TW2837-BB1-GR (Note 1)
TW2837-PB1-GE (Note 2)
NOTE:
PART
MARKING
TW2837 DABB1-GR
TW2837 DAPB1-GE
PACKAGE
(Pb-free)
256 Ld PBGA (17mm x 17mm)
208 Ld PQFP (28mm x 28mm)
1.
These Intersil Pb-free BGA packaged products employ special Pb-free material sets; molding compounds/die attach
materials and SnAg -e2 solder ball terminals, which are RoHS compliant and compatible with both SnPb and Pb-free
soldering operations. Intersil Pb-free BGA packaged products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
2.
These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with
both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
FN7742 Rev. 1.00
August 28, 2012
Page 5 of 232
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