Service Guide

LTE Standard Module Series

EG91_Series_Hardware_Design

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The following table describes the characteristics of ADC interface.

Table 19: Characteristics of ADC Interface

1. It is prohibited to supply any voltage to ADC pins when ADC pins are not powered by VBAT.

2. It is recommended to use resistor divider circuit for ADC application.

3.17. Behaviors of RI

AT+QCFG="risignaltype","physical" can be used to configure RI behavior. See document [3] for

details.

No matter on which port URC is presented, URC will trigger the behavior of RI pin.

URC can be outputted from UART port, USB AT port and USB modem port through configuration via

AT+QURCCFG. The default port is USB AT port.

The default behaviors of the RI are shown as below, and can be changed by AT+QCFG="urc/ri/ring".

See document [3] for details.

Table 20: Default Behaviors of RI

Parameter Min. Typ. Max. Unit

ADC0 Voltage Range 0.3 VBAT_BB V

ADC Resolution 15 bits

State Response

Idle RI keeps at high level

URC RI outputs 120 ms low pulse when a new URC returns

NOTE