Reference Manual

Hardware Reference Manual
Version 1.0 - 56 - eInfochips Confidential
J22.15
CDC_LINE_OUT1_P
Line Output_2 Negative
J22.16
CDC_LINE_OUT2_M
Line Output_1 Negative
Table 21: IO Card Audio Header (J22) Pinout
6.3.9 Sensors
ERAGON660 supports multiple sensors as below,
 Magnetometer, Accelerometer& Gyrometer, Pressure sensor and ALSP (Ambient Light and
Proximity) sensor interfaced to SDA660 through LPI I2C and SPI.
6.3.10 Micro SD Card
The ERAGON660 SBC has push-push type Micro SD card slot for external storage device (SD
card). SD card is interfaced with SDA660 (on SBC) through 4-bit SDC2 data signals along with
SDC2 clock and SDC2 command signals. GPIO_54 of SDA660 is used to detect SD card insertion
and removal.
Figure 21 – SBC Micro SD card connector
6.3.11 DSI to HDMI
The Qualcomm SDA660 Processor does not include a built-in HDMI interface. The ERAGON660 has the
built-in MIPI-DSI 4 lanes interface, which is used, as a source for the HDMI output. A DSI to HDMI Bridge
Board performs this task and it supports a resolution from 480p to 720p at 30Hz.
While the ADV7533 on the DSI to HDMI Bridge board supports automatic input video format timing
detection (CEA-861E) and an I2C channel from the SDA660 allows the user to configure the operation of
this Bridge Board. The BLSP4_I2C interface is used from the SoC that connects to the Bridge board.
This Bridge Board supports audio as well. The ERAGON660 uses a single bit MI2S_1 interface from the
SNAPDRAGON 660 chip which is mentioned in the below block. The ERAGON660 contains the 14 pin
HDMI Audio Connector (J23) on the board. A 3-wire (audio out only) I2S channel is routed directly
from the SNAPDRAGON 660 SoC I2S interface pins to the DSI-HDMI bridge Board through HDMI Audio
connector.