Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 58 / 134
PCM_DIN
PCM_DOUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
Module
4.7K
4.7K
BCLK
LRCK
DAC
ADC
SCL
SDA
BIAS
MICBIAS
INP
INN
LOUTP
LOUTN
Codec
1.8 V
Figure 24: Reference Circuit of PCM and I2C Application with Audio Codec
1. It is recommended to reserve an RC (R = 22 Ω, C = 22 pF) circuits on the PCM lines, especially for
PCM_CLK.
2. EC25 works as a master device pertaining to I2C interface.
3.13. SD Card Interface
EC25 supports SDIO 3.0 interface for SD card.
The following table shows the pin definition of SD card interface.
Table 15: Pin Definition of SD Card Interface
Pin Name
Pin No.
I/O
Description
Comment
SDC2_DATA3
28
IO
SD card SDIO bus DATA3
SDIO signal level can be
selected according to SD
card supported level,
please refer to SD 3.0
protocol for more details.
If unused, keep it open.
SDC2_DATA2
29
IO
SD card SDIO bus DATA2
SDC2_DATA1
30
IO
SD card SDIO bus DATA1
SDC2_DATA0
31
IO
SD card SDIO bus DATA0
NOTES