SiI9437/SiI9438 ARC/Enhanced ARC
Receiver and Transmitter
Data Brief
SiI-DB-02013-B
October 2017
SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
Data Brief
2 © 2016-2017 Lattice Semiconductor SiI-DB-02013-B
All rights reserved.
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SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
Data Brief
3 © 2016-2017 Lattice Semiconductor SiI-DB-02013-B
All rights reserved. CONFIDENTIAL
1. General Description
The SiI9437/SiI9438 ARC/Enhanced ARC
receiver/transmitter from Lattice Semiconductor adds
higher bandwidth Enhanced Audio Return Channel
(eARC) capability to HDMI®-based designs.
The SiI9437/SiI9438 ARC/Enhanced ARC
receiver/transmitter support audio bit rates up to
98 Mb/s (36.8 Mb/s payload). Manufacturers of
televisions, audio/video receivers, and sound bars can
use these devices to implement eARC with up to 8-
channels of 24-bit, 192 kHz audio.
This new high bit rate, low jitter audio interface
transmits over standard HDMI with Ethernet cable
using the available differential twisted pair of pins 14
and 19. The devices are backward-compatible with
HDMI 1.4 Audio Return Channel, for connectivity with
legacy ARC devices.
Implementing eARC into consumer electronics
products helps to ensure greater interoperability and
forward-compatibility without compromise. This is
especially important as new devices with Dynamic
HDR, Variable Refresh, and other HDMI 2.1 features
come to market.
The SiI9437/SiI9438 include support for the eARC
Common Mode Data Channel, used for Discovery,
Capabiity Detection, Heartbeat, and Lipsync features of
eARC.
The SiI9437/SiI9438 design enables integration in
conjunction with existing HDMI transmitters and
receivers, and operates independently of the HDMI
frequency, mode, and encoding format. No HDMI 2.1
or HDMI 2.0 dependency exists; the devices can be
integrated with HDMI transmitter/receivers using any
version of HDMI.
Figure 1.1 on the next page shows a typical systems
diagram of SiI9437/SiI9438 ARC/Enhanced ARC
receiver/transmitter
1.1. Applications
Televisions (SiI9438 Transmitter)
AVRs (SiI9437 Receiver)
Home Theater-in-a-Box (SiI9437 Receiver)
Soundbars (SiI9437 Receiver)
1.2. Audio Interfaces
SiI9438 Transmitter:
Four-lane I2S inputs
IEC60958 (S/PDIF) input
HDMI eARC (differential signal) transmitter
HDMI Legacy ARC (Single Mode) output
compatibility
SiI9437 Receiver:
Four-lane I2S outputs
IEC60958 (S/PDIF) output
HDMI eARC (differential signal) receiver
HDMI Legacy ARC (single mode or Common
mode) input compatibility
1.3. Audio Support
Dolby® Digital
Dolby Digital PlusTM
Dolby® TrueHD
DTSTM
DTS-HD
DTS HD Master AudioTM
Dolby AtmosTM
DTS:XTM
PCM audio, up to 8 channels, 24-bit, 192 kHz
1.4. Programming Interface
Local I2C bus
1.5. Packaging
32-pin, 4 mm × 4 mm, 0.4 mm pitch QFN package
with an exposed pad (ePad)
SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
Data Brief
4 © 2016-2017 Lattice Semiconductor SiI-DB-02013-B
All rights reserved. CONFIDENTIAL
AVR
SiI9437
TV
HDMI Video
AUDIO OUT AUDIO IN
HDMI
Source
HDMI
SINK
Differential eARC
Common Mode
Communication
SiI9438
Audio Data
HPD
UTIL
Figure 1.1. Typical System Diagram
SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
Data Brief
SiI-DB-02013-B © 2016-2017 Lattice Semiconductor 5
All rights reserved.
2. Pin Diagram
Figure 2.1 shows the pin assignments of the SiI9437/SiI9438 device. The package is a 4 mm × 4 mm 32-pin QFN with an
ePad. For best performance, the ePad should be soldered to a pad on the PC board that is electrically connected to
ground, but it is not required to make an electrical ground connection since the package also has GND pins.
Pin names are generalized by type for this document. The list below the diagram describes the purpose of each type.
CI2CA/GPIO
GPIO
GPIO
CTRL_SIG_I
CTRL_SIG_O
1.2V
GND
I2C_BUS
SiI9437/SiI9438
(Top View)
1
2
3
4
5
24
23
22
21
20
ePad (GND)
RSVD
1.2V 619
I2C_BUS
GPIO
RSVD/HPD
Diff_Audio
1.2V
3.3V
32
31
30
29
28
25
GND
7
8
GND
AUDIO_CTRL_IO
15
16
AUDIO_IF_IO
3.3V 1.2V
26
Diff_Audio
27
AUDIO_CTRL_IO
18
17 AUDIO_IF_IO
GPIO
GPIO General Purpose Input/Output
AUDIO_CTRL_IO Audio Control Input/Output
AUDIO_IF_IO Audio Interfacel Input/Output
CTRL_SIG_I Control Input
CTRL_SIG_O Control Output
I2C_BUS I2C Bus, 5 V Tolerant
HPD Hot Plug Detect
RSVD Reserved
GND Ground
Figure 2.1. Pin Diagram
SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
Data Brief
6 © 2016-2017 Lattice Semiconductor SiI-DB-02013-B
All rights reserved. CONFIDENTIAL
3. Package Information
3.1. ePad Requirements
The SiI9437/SiI9438 receiver/transmitter is packaged in a 32-pin, 4 mm × 4 mm QFN package with an exposed pad
(ePad) that is 2.7 mm × 2.7 mm (±0.1 mm). Soldering the ePad to the ground plane of the PCB is recommended for
improved grounding and thermal transfer but is not required for typical applications.
Figure 3.1 on the next page shows the package dimensions of the SiI9437/SiI9438 receiver/transmitter.
SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
Data Brief
SiI-DB-02013-B © 2016-2017 Lattice Semiconductor 7
All rights reserved.
3.2. Package Dimensions
These drawings are not to scale.
C
MA B
eee
K
32X L
J
e/2
16
17
32
Bottom View
View M M
32X b
AB
PIN 1 CORNER
aaa C
SEATING PLANE
C
A1
A
(A3)
1
32
D
E
Top View
ccc C
// bbb C
A2
M
M
C
MA B
eee
25
24
9
8EXPOSED DIE
ATTACH PAD
PIN 1 I.D.
1
e
C
MA B
ddd
JEDEC Package Code- MO-220
Item
Description
Min
Max
Item
Description
Min
Typ
Max
A
Total Thickness
0.80
0.90
J
Exposed Pad Size
2.6
2.7
2.8
A1
Stand Off
0
0.05
K
2.6
2.7
2.8
A2
Mold Thickness
0.67
L
Lead Length
0.25
0.3
0.35
A3
L/F Thickness
0.203 REF
aaa
Package Edge Tolerance
0.1
D
Body Size
4 BSC
bbb
Mold Flatness
0.1
E
4 BSC
ccc
Coplanarity
0.08
b
Lead Width
0.15
0.25
ddd
Lead Offset
0.1
e
Lead Pitch
0.4 BSC
eee
Exposed Pad Offset
0.1
Note: All dimensions are in millimeter.
Figure 3.1. Package Diagram
SiI9437/SiI9438 ARC/Enhanced ARC Receiver and Transmitter
Data Brief
8 © 2016-2017 Lattice Semiconductor SiI-DB-02013-B
All rights reserved. CONFIDENTIAL
3.3. Marking Specification
The marking diagram for SiI9437 is shown in Figure 3.2. This drawing is not to scale.
9437CNUC
Pin 1 ID
DATECODE
Figure 3.2. SiI9437 Marking Diagram
The marking diagram for SiI9438 is shown in Figure 3.3. This drawing is not to scale.
9438CNUC
Pin 1 ID
DATECODE
Figure 3.3. SiI9438 Marking Diagram
3.4. Ordering Information
Production Part Numbers:
Device
Part Number
SiI9437 Enhanced ARC Receiver
SiI9437CNUC
SiI9438 Enhanced ARC Transmitter
SiI9438CNUC
7th Floor, 111 SW 5th Avenue
Portland, OR 97204, USA
T 503.268.8000
www.latticesemi.com