User's Manual

Cinterion
®
EHS6-A Hardware Interface Overview Page 17 of 41
2.1 Application Interface
22
 EHS6-A_HIO_v02.770 2014-08-13
Confidential / Preliminary
2.1.5 Analog Audio Interface
EHS6-A 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
provided at dedicated pads.
2.1.6 Digital Audio Interface
EHS6-A digital audio interface (DAI) can be used to connect audio devices capable of pulse
code modulation (PCM).
2.1.7 GPIO Interface
EHS6-A offers a GPIO interface with 22 GPIO lines. The GPIO lines are shared with other
interfaces or functions: Fast shutdown (see
Section 2.1.14), status LED (see Section 2.1.13),
the PWM functionality (see
Section 2.1.11), an pulse counter (see Section 2.1.12), ASC0 (see
Section 2.1.2), ASC1 (see Section 2.1.3), an SPI interface (see Section 2.1.9), an HSIC
interface (see
Section 2.1.10) and a PCM interface (see Section 2.1.11)
The following table shows the configuration variants for the GPIO pads. All variants are
mutually exclusive, i.e. a pad configured for instance as Status LED is locked for alternative
usage.
Table 2: GPIO lines and possible alternative assignment
GPIO Fast
Shutdown
Status
LED
PWM Pulse
Counter
ASC0 ASC1 SPI HSIC PCM
GPIO1 DTR0
GPIO2 DCD0
GPIO3 DSR0 SPI_CLK
GPIO4 FST_SHDN
GPIO5 Status
LED
GPIO6 PWM2
GPIO7 PWM1
GPIO8 COUNTER
GPIO11
GPIO12
GPIO13
GPIO14
GPIO15
GPIO16 RXD1 MOSI AP_WAKEUP