Product Info

LTE Standard Module Series
EC21 Hardware Design
EC21_Hardware_Design 63 / 120
In order to improve the accuracy of ADC, the trace of ADC should be surrounded by ground.
Table 17: Pin Definition of ADC Interfaces
Pin Name Pin No. Description
ADC0 45 General purpose analog to digital converter
ADC1 44 General purpose analog to digital converter
The following table describes the characteristic of ADC function.
Table 18: Characteristic of ADC
Parameter Min. Typ. Max. Unit
ADC0 Voltage Range 0.3 VBAT_BB V
ADC1 Voltage Range 0.3 VBAT_BB V
ADC Resolution 15 bits
1. ADC input voltage must not exceed that of VBAT_BB.
2. It is prohibited to supply any voltage to ADC pins when VBAT power supply is removed.
3. It is recommended to use a resistor divider circuit for ADC application.
3.16. SGMII Interface
EC21 includes an integrated Ethernet MAC with an SGMII interface and two management interfaces. The
key features of the SGMII interface are shown below:
 IEEE802.3 compliant
 Support 10M/100M/1000M Ethernet work mode
 Support VLAN tagging
 Support IEEE1588 and Precision Time Protocol (PTP)
 Can be used to connect to external Ethernet PHY like AR8033, or to an external switch
 Management interfaces support dual voltage 1.8V/2.85V
NOTES