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ALS3-US R4 Hardware Interface Overview
3.6 Analog Audio Interface
27
ALS3-USR4_HIO_v03.915
2017-03-27
Confidential / Preliminary
Page 26 of 44
3.6
Analog Audio Interface
ALS3-US R4 has an analog audio interface with a balanced analog microphone input and a
balanced analog earpiece output. A supply voltage and an analog ground connection are pro-
vided at dedicated pads.
balanced analog earpiece output. A supply voltage and an analog ground connection are pro-
vided at dedicated pads.
ALS3-US R4 offers six audio modes which can be selected with the AT^SNFS command. The
electrical characteristics of the voiceband part vary with the audio mode. For example, sending
and receiving amplification, sidetone paths, noise suppression etc. depend on the selected
mode and can be altered with AT commands (except for mode 1).
electrical characteristics of the voiceband part vary with the audio mode. For example, sending
and receiving amplification, sidetone paths, noise suppression etc. depend on the selected
mode and can be altered with AT commands (except for mode 1).
When shipped from factory, all audio parameters of ALS3-US R4 are set to audio mode 1. This
is the default configuration optimized for the Votronic HH-SI-30.3/V1.1/0 handset and used for
type approving the Gemalto M2M reference configuration.
is the default configuration optimized for the Votronic HH-SI-30.3/V1.1/0 handset and used for
type approving the Gemalto M2M reference configuration.
3.7
Digital Audio Interface
ALS3-US R4 supports a digital audio interface that can be employed either as pulse code mod-
ulation interface or as inter IC sound interface. Operation of these interface variants is mutually
exclusive, and can be configured by AT command (see
ulation interface or as inter IC sound interface. Operation of these interface variants is mutually
exclusive, and can be configured by AT command (see
). Default setting is pulse code mod-
ulation.
3.8
Analog-to-Digital Converter (ADC)
ALS3-US R4 provides three unbalanced ADC input lines: ADC1_IN, ADC2_IN and ADC3_IN.
They can be used to measure three independent, externally connected DC voltages in the
range of 0.3V to 3.075V.
They can be used to measure three independent, externally connected DC voltages in the
range of 0.3V to 3.075V.
3.9
GPIO Interface
ALS3-US R4 has 10 GPIOs for external hardware devices. Each GPIO can be configured for
use as input or output. All settings are AT command controlled.
use as input or output. All settings are AT command controlled.