Data Sheet
Table Of Contents
- NKR-SWA54_User Manual_1121
- General Description
- Applications
- Ordering Options
- Features
- Revision History
- SWA54 Functional Description
- SWA54 Connector Information
- 1 Electrical, Audio and Timing Specifications
- 1.1 Module ESD spec.
- 1.2 Recommended Operating Range
- 1.3 Electrical Characteristics – DC Characteristics
- 1.4 Electrical Characteristics – RF PLL Characteristics
- 1.5 Electrical Characteristics – RF RX Characteristics
- 1.6 Electrical Characteristics – RF TX Characteristics
- 1.7 Electrical Characteristics – Audio C/CS
- 1.8 I2S Communication Interface Timing
- 1.9 I2C Master/Slave Communication Interface Timing (S_SCL, S_SDA)
- SWA54 integration manual_final
SWA54 Module Datasheet Rev 1.2
3
SWA54 Functional Description
The SWA54 module is available in 2 variations; digital input transmitter module or digital output receiver
module.
There are three available I2S digital audio data inputs/outputs, each of these can be configured to operate as
either a master or a slave - depending on the application, the I2S ports can operate simultaneously as either
inputs or outputs. When configured as slaves, the I2S inputs/outputs can be independently clocked by up to
two external masters. In addition, MCLK can be output from the module to provide a reference clock source to
an external ADC or DAC. MCLK can also be input to the module to provide a reference clock from an
external source.
Figure 1 shows the block diagram of the SWA54 module. The hardware for the audio input (transmit) and
audio output (receive) versions of the module is identical and only the firmware loaded onto the module
determines its function.
The highly integrated nature of the SKY76303-21 transceiver IC results in few external components being
required for the SWA54 module design. 2 printed PCB antennas are used to achieve increased range, and to
achieve antenna spatial diversity. The extended-range RF path consists of the antennas, associated tuning
components, shield can, the RF switch, RF power amplifer (PA) and two baluns, one connected to each of the
RF input/output ports on the SKY76303-21 IC.
A 16MHz crystal oscillator generates the SKY76303-21 fundamental system clock used as the basis for all RF
and digital audio clocks.
A 2Mb flash memory chip is used to store the module’s application firmware. The SKY76303-21 is able to
boot from internal ROM upon first power up, which enables programming the flash chip with the application
firmware through USB. In addition, Over-the-air Firmware upgrade capability can be enabled through the
application firmware. The module can be controlled from an external host device via the I2C Slave or the SPI
Slave data interfaces. The I2C master port allows the module to control other system audio devices such as a
sub-woofer amplifier system without having to add another MCU to the product design. Up to 9 additional
GPIOs are available on the SWA54 module (not including I2C and I2S signals) for implementing different UI
features on the target application. The resources mentioned above can be leveraged to implement low cost
sub-woofer designs as outlined below.
Typical Sub-Woofer Implementation
A basic SKY76303-21 Wireless Subwoofer system block Diagram is shown in Fig. 2.
Figure 1: SKY76303-21 Wireless Subwoofer Solution Block Diagram