User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 UICC/SIM/USIM Interface
- 2.1.7 Digital Audio Interface
- 2.1.8 Pulse Code Modulation Interface (PCM)
- 2.1.9 Inter IC Sound Interface (I2S)
- 2.1.10 GPIO Interface
- 2.1.11 I2C Interface
- 2.1.12 SPI Interface
- 2.1.13 Pulse Counter
- 2.1.14 HSIC Interface (ELS51-VA Only)
- 2.1.15 SDIO Interface (ELS51-VA Only)
- 2.1.16 Control Signals
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 2.1 Application Interface
- 3 Operating Characteristics
- 3.1 Operating Modes
- 3.2 Power Up/Power Down Scenarios
- 3.3 Power Saving
- 3.4 Power Supply
- 3.5 Operating Temperatures
- 3.6 Electrostatic Discharge
- 3.7 Blocking against RF on Interface Lines
- 3.8 Reliability Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
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ELS31-VA/ELS51-VA Hardware Interface Description
2.1 Application Interface
56
ELS31-VA_ELS51-VA_HID_v01.000 2017-01-04
Confidential / Preliminary
Page 31 of 106
2.1.7 Digital Audio Interface
ELS31-VA/ELS51-VA supports a digital audio interface that can be employed either as pulse
code modulation interface (see Section 2.1.8) or as inter IC sound interface (see Section 2.1.9).
Operation of these interface variants is mutually exclusive, and can be configured by AT com-
mand (see [1])). Default setting is pulse code modulation.
2.1.8 Pulse Code Modulation Interface (PCM)
Note: ELS31-VA/ELS51-VA's PCM interface is reserved for future use. Usage as digital audio
interface is currently not supported.
ELS31-VA/ELS51-VA's PCM interface can be used to connect audio devices capable of pulse
code modulation. The PCM functionality is limited to the use of covers the use of narrowband
codecs with 8kHz sample rate and wideband codecs with 16kHz sample rate onlyas well. Con-
figured for wideband the The PCM interface runs at 16 kHz sample rate (62.5µs frame length),
while the signal processing maintains this rate in a wideband AMR call or samples automati-
cally down to 8kHz in a narrowband call. Therefore, the PCM sample rate is independent of the
audio bandwidth of the call.
The PCM interface has the following implementation:
•Slave mode
• Short frame synchronization, long frame synchronization
• 8kHz and 16kHz sample rate
• 256kHz, 512kHz, 2048kHz bit clock at 8kHz sample rate
• 256kHz, 512kHz, 1024kHz, 4096kHz bit clock at 16kHz sample rate
For the PCM configuration the AT^SAIC command parameters <clock>, <mode>, <frame_-
mode>, <ext_clk_mode> and <sample_rate> (see [1]) cannot be configured in any combina-
tion. The following notes, must be considered while configuring the PCM interface:
ELS31-VA/ELS51-VA’s digital audio interface can only be operated in slave mode. Therefore,
the <mode> parameter must be set to <1>, and the <ext_clk_mode> be set to not permanent
resp. off. Further, while in slave mode the <clock>, <frame_mode> and <sample_rate> must
be set according to the characteristics of the external master. There is no automatic detection
of the received clock frequency, frame length and sample rate.
Four GPIOs can be configured by AT command as PCM signals: GPIO20 --> PCM_I2S_OUT,
GPIO21--> PCM_I2S_IN, GPIO22 --> PCM_I2S_FSC and GPIO23 --> PCM_I2S_CLK. The
setting is non-volatile and becomes active after a module restart (see also [1]).
Table 5 describes the available DAI/PCM lines at the digital audio interface. For electrical de-
tails see Section 2.1.2.