Hardware Design

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SIM8200EA-M2 card Hardware Design _V1.01 30 2019-06-27
MODULE
I2S_DIN
I2S_WS
I2S_CLK
I2S_DOUT
33pF
ADCOUT
FS
BCLK
DACIN
MCLK
VDD_1V8
2.2K
2.2
K
SCLK
SDIO
I2C1_SCL
I2C1_SDA
VDDA
VDDSPK
VDDD
3.3V 3.3V VDD_1V8
MIC+
MIC-
MICBIAS
MOUT
MIC
Receiver
NAU88U10
2.2K
2.2K
1uF
1uF
47uF
47uF
I2S_MCLK
Figure 16: Audio codec reference circuit
3.11 DPR*
DPR (Dynamic Power Reduction) signal is used by SIM8200EA-M2 to assist in meeting
regulatory SAR (Specific Absorption Rate) requirements for RF exposure. The signal is provided
by a host system proximity sensor to the wireless device to provide an input trigger causing a
reduction in the radio transmit output power.
User can use AT command to active this function, if do not need this function, this pin can be
keep floating.
Table 15: DPR interface
Pin no
Pin Name
Pin status
Function
25
DPR
Low
Max
transmitting power will be reduced
High
Max transmitting power will
not be reduced (default)
Floating
Max transmitting power will not be reduced
Note:* means the DRP function is under developing.
3.12 I2C Interface
Module provides an I2C interface compatible with I2C specification, version 5.0, with clock rate
up to 400 kbps. Its operation voltage is 1.8V.
The following figure shows the I2C bus reference design.
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