Siemens 1218RF Bedienungsanleitung

1218RF USER'S MANUAL

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Siemens Industry Software B.V.

1218RF User's manual

Release date: 2016-02a

1218RF USER'S MANUAL

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Contents

1 Overview.................................................................................................................................................... 3

2 Operation................................................................................................................................................... 3

3 Performance .............................................................................................................................................. 3

4 Approval and usage ................................................................................................................................... 4

4.1 FCC compliance ................................................................................................................................. 4

4.2 FCC ID................................................................................................................................................. 4

4.3 FCC labeling requirements ................................................................................................................ 4

5 Adaptive Frequency Hopping .................................................................................................................... 4

6 Active Channel Selection / Listen-Before-Talk .......................................................................................... 5

7 Mechanical ................................................................................................................................................ 6

8 Mounting ................................................................................................................................................... 6

9 Pinout ........................................................................................................................................................ 7

10 Module types......................................................................................................................................... 8

10.1 Master module .................................................................................................................................. 8

10.2 Slave module ..................................................................................................................................... 8

11 Programming ......................................................................................................................................... 9

11.1 Output power .................................................................................................................................... 9

11.2 Antenna diversity............................................................................................................................... 9

11.3 RF data rate ....................................................................................................................................... 9

12 Integration............................................................................................................................................. 9

13 Antenna ................................................................................................................................................. 9

1218RF USER'S MANUAL

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1Overview

The 1218RF module is a wireless lossless audio interface based on the Texas Instruments CC8520 PurePath™ Wireless

SoC. The module incorporates the crystal, the required RF matching, power supply filtering and filtering on the digital

interface for FCC compliance. The module incorporates a CC2590 range extender with power amplifier for increased

output power and LNA for improved receiver sensitivity.

The module has two antenna options:

- Single antenna

- Dual antenna with antenna diversity using an AS222-92 switch.

The module can be programmed to act both as master and as slave where the master dictates the audio sample rate

and selects the rf channels, antenna diversity is only available on slave modules.

2Operation

The 1218RF is a wireless lossless digital audio link based on the Texas Instruments CC8520 PurePath™ Wireless SoC.

It uses multiple techniques for excellent robustness and co-existence.

-Adaptive frequency hopping

-Forward error correction

-Buffering and retransmission

-Error concealment

It interfaces to audio ADCs, DACs and CODECs through an I2S digital audio interface.

The 1218RF module incorporates a CC2590 range extender with power amplifier that has a gain of 14dB, maximum

output power equals +14 dBm (25 mW). Antenna diversity is available on slave modules to reduce effects of RF

multipath fading. The 1218RF module is based on the Texas Instruments CC85XX-CC2590EM_Antenna_Diversity

reference design.

All CC8520 SoC signals are available on 1218RF pins, allowing access to all features of the CC8520 SoC. A complete

overview of the features can be found in the “CC85xx Family User’s Guide”.

3Performance

The power supply on the 1218RF module is filtered but not regulated. To comply with FCC regulations the carrier must

provide a regulated supply.

Recommended operating conditions

Parameter

Min

Max

Unit

Operating ambient temperature range, TA

-40

+85

°C

Operating supply voltage

2.4

3.6

RF characteristics, CC8520 + CC2590

Parameter

Test condition

MIN

TYP

MAX

Unit

RF frequency range

2400

2483.5

MHz

Data rate

Shaped 8FSK

Mbps

Output power

Maximum output power setting

dBm

Receiver sensitivity

5 Mbps

-87

dBm

Occupied bandwidth

99% energy bandwidth, 5 Mbps

3.8

MHz

1218RF USER'S MANUAL

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Channel list

Channel

Center Frequency

(MHz)

Channel

Center Frequency

(MHz)

2406

2442

2410

2446

2414

2450

2418

2454

2422

2458

2426

2462

2430

2466

2434

2470

2438

2474

4Approval and usage

The 1218RF module has been designed to meet FCC (US) and ETSI (Europe) regulations.

4.1 FCC compliance

This device complies with part 15 of the FCC rules

Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and

(2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s

authority to operate the equipment. This in particular is applicable for the antenna which has been delivered with the

system.

To comply with FCC RF exposure requirements for mobile transmitting devices, this transmitter should only be used or

installed at locations where there is at least 20cm separation distance between the antenna and all persons.

4.2 FCC ID

The FCC ID for the 1218RF module is: 2AF88-1218RF.

4.3 FCC labeling requirements

The 1218RF modules are labelled with their own FCC ID; if this FCC ID is not visible from the outside of the finished

product, the finished product must be labelled with the FCC ID.

Contains FCC ID: 2AF88-1218RF

5Adaptive Frequency Hopping

The purpose of using frequency hopping in a radio system is to provide diversity that allows data throughput to be

maintained even if interfering radio systems or the physical environment (multipath fading) renders some RF channels

unusable. In the 2.4 GHz ISM band, the sheer amount of radio systems and the severity and dynamic nature of indoor

fading phenomena in typical operating environments require the use of this kind of diversity if a minimum data

throughput is to be assured (as audio streaming requires)

Frequency hopping systems can either implement a fixed sequence of channel hops or adapt its hopping sequence

dynamically to the changing environment it operates in. In order to maximize its own chances of delivering audio data

1218RF USER'S MANUAL

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in time and to co-exist amicably with other fixed-frequency or adaptive frequency hopping systems, PurePath Wireless

uses an advanced adaptive frequency hopping (AFH) scheme that adapts to changing conditions within tens of

milliseconds.

The PurePath Wireless RF Communication System divides the 2.4 GHz ISM band into 18 RF channels with 4 MHz

bandwidth. The protocol master controls the adaptive frequency hopping scheme for the audio network, and

maintains a table with an entry for each RF channel and an associated quality-of-service (QoS) estimate for each. Each

time an RF channel is used the QoS estimate is updated based on what happens during the timeslot.

The frequency hopping algorithm separates the 18 RF channels into two sets:

-A set of 4 active channels

-A set of 14 trial channels

The active channel set contains the preferred RF channels that have proven that they provide sufficiently good quality-

of-service. The trial channel set contains the remaining RF channels that are only evaluated occasionally in order to be

able to maintain an accurate picture of their quality-of-service. If the QoS estimate of an RF channel in the active set

goes beyond a minimum threshold this channel is swapped out with the RF channel in the trial channel set that has

the best QoS estimate. Other factors play in when selecting a new RF channel to the active channel set, such as trying

to maintain a certain minimum distance in frequency between the different active channels.

The frequency hopping algorithm, employs the following macro-sequence, when no swaps between the active and

trial channel sets occur, it goes through a sequence of 70 frequency hops over the course of which every RF channel

has been used.

This 70-hop macro-sequence consists of 14 repetitions of 5-hop micro-sequence during which:

-Each of the four active RF channels is used once

-One of the trial RF channels is used once (cycling through all trial channels over the course of a macro-

sequence)

Four active channels are selected randomly at start-up seeded by a unique 32-bit device address, which is stored in

the hardware by Texas Instruments during chip production.

6Active Channel Selection / Listen-Before-Talk

In addition to AFH, listen-before-talk (LBT) is used by the master at the start of every timeslot to determine the energy

in the current channel and these measurements are compared against a threshold and are used to detect a “bad”

channel. In addition, at the end of every timeslot one will detect if one or more slave packets are missing.

-Two failing LBTs in a row for a given channel will mark the channel as bad / occupied.

-Three failing LBTs during the last five timeslots at a given channel will mark the channel as bad / occupied.

-If three timeslots in a row for a given channel has missing slave packets, the channel is marked as bad.

If any of the active channels are marked as bad they are replaced by the best channel that is furthest away from the

remaining three good channels.

1218RF USER'S MANUAL

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7Mechanical

The 1218RF module measures 40 by 40 mm.

Two antenna options are available on the 1218RF module.

J1 and J2: Dual antenna option with antenna diversity (slave only).

J3: Single antenna option (master and slave).

Antennas are connected through U.FL connectors.

8Mounting

The 1218RF module is mounted on the carrier using two 20-pin connectors and fixed using an M3 screw.

P1 and P2 are SAMTEC TFM-110-02-L-D-A-K.

1218RF USER'S MANUAL

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9Pinout

The pinout of the two 20-pin connectors is shown below.

GND

GIO1

SDA

GIO2_RESET

SCL

SPI_CSN

GIO12

SPI_CLK

GIO13

SPI_MOSI

GND

GIO0_SPI_MISO

GND

GIO9_AD2

P3V3

GIO8_AD1

P3V3

GIO7_AD0

GIO6_WCLK

GIO4_MCLK

RSTN

GIO5_BCLK

GIO3

1218RF USER'S MANUAL

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10 Module types

Two 1218RF modules are available: One that acts a master and one that acts as a slave. The slave module supports

antenna diversity.

10.1 Master module

The master module dictates the sample rate and decides which RF channels are used. The following connections are

required on the master:

Signal

Direction

Function

P3V3

Input

3.3V power supply

RSTN

Input

Module reset

AD1

Output

I2S data

BCLK

Output

I2S data clock

WCLK

Output

I2S word clock

MCLK

Output

I2S Master clock

GIO2

Output

Audio device reset

SCK

Input

SPI clock

GIO1

Input

SPI select

MISO

Output

SPI data (slave out)

MOSI

Input

SPI data (slave in)

CSN

Input

Network pairing start

10.2 Slave module

The slave module derives its sample rate from the wireless interface. The following connections are required on the

slave:

Signal

Direction

Function

P3V3

Input

3.3V power supply

RSTN

Input

Module reset

AD1

Output

I2S data

BCLK

Output

I2S data clock

WCLK

Output

I2S word clock

MCLK

Output

I2S Master clock

GIO2

Output

Audio device reset

SCK

Input

SPI clock

GIO1

Input

SPI select

MISO

Output

SPI data (slave out)

MOSI

Input

SPI data (slave in)

CSN

Input

Network pairing start

1218RF USER'S MANUAL

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11 Programming

The 1218RF module can be configured and programmed using the “PurePath Wireless Configurator” from Texas

Instruments. A manual is available from inside the configurator.

While configuring the modules using the “PurePath Wireless Configurator” take notice of the following:

11.1 Output power

Maximum output power of the 1218RF module is 25mW (without cables loss and antenna gain), well within the limits

of FCC and ETSI. Make the following settings in the radio settings tab:

Range extender: CC2590 (HGM)

Target TX power (excl. CC259x): 5 dBm

11.2 Antenna diversity

In the radio settings tab of slave configurations antenna diversity can be enabled. Make sure to only program this

configuration into a module that supports antenna diversity.

11.3 RF data rate

The 1218RF module was approved in 5Mbps mode which translates into 8FSK modulation. In order to use the FCC

approval of the 1218RF module the RF data rate must be set to 5 Mbps.

12 Integration

The 1218RF module is not available for resale. The module was developed by Siemens Industry SoftWare (SISW) to

ease integration of the purepath wireless protocol in several hardware platforms. SISW has integrated the 1218RF

module as master in the “Pass By Noise conditioner”and as slave in a wireless microphone. Future implementations

of the 1218RF module will be designed by SISW or must be approved by SISW.

13 Antenna

The following antennas have been approved for the 1218RF module.

Manufacturer

Model

Order code

Gain

Laird Technologies

WRR2400-RPSMA-B

MAF94028

1.3 dBi

Laird Technologies

WRR2400-RPSMA-G

MAF94026

1.3 dBi

Any compatible antenna with a gain of less than 2 dBi is allowed.

FCC requires the use of a non-standard antenna connector. The following connectors have been considered

acceptable for meeting the requirement in Section 15.203: MMCX, MCX, and reverse polarity, SMA, BNC and TNC.

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