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
Cinterion
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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 32 of 106
Note: PCM data is always formatted as 16-bit uncompressed two’s complement. Also, all PCM
data and frame synchronization signals are written to the PCM bus on the rising clock edge and
read on the falling edge.
The timing of a PCM short frame is shown in Figure 11.
Figure 11: PCM timing short frame (4096KHz, 16kHz sample rate)
Configured to short frame synchronization, the pulse on PCM_I2S_FSC should be one clock
period wide and occur one clock before the data, using long frame the pulse should have a duty
cycle of 50% starting with the first data bit.
Characteristics of Audio Modes
ELS31-VA/ELS51-VA has various audio modes selectable with AT^SNFS (for details on
AT^SNFS see [1]).
Audio mode 1 with its default settings is used for type approval with the Votronic handset via
the DSB75 codec adapter. The handset is adjusted for the type 3.2 low-leakage ear simulator
for narrowband and wideband calls.
The other modes are customer specific modes, and can as such be prepared for specific re-
quirements.
Table 5: Overview of PCM pin functions
Signal name on
B2B connector
SMT application
interface
Signal
configuration
inactive
Signal
direction:
Slave
Description
PCM_I2S_OUT PD O PCM data from ELS31-VA/ELS51-VA to external
codec
PCM_I2S_IN PD I PCM data from external codec to ELS31-VA/
ELS51-VA
PCM_I2S_FSC PD I Frame synchronization signal from external codec
PCM_I2S_CLK PD I Bit clock from external codec
MSB
MSB
LSB
LSB
14 13
14 13
1
1
12
12
2
2
MSB
MSB
62.5 µs
PCM_I2S_CLK
PCM_I2S_FSC
PCM_I2S_OUT
PCM_I2S_IN