User Guide

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GM500-U1G_A
Hardware Development Guide
Figures
Figure 1–1 System Connection Structure ..................................................................................... 14
Figure 2–1 Pin Assignment .......................................................................................................... 16
Figure 2–2 The input reference circuit of VBAT ............................................................................ 25
Figure 2–3 Reference circuit of DC-DC ........................................................................................ 26
Figure 2–4 Reference circuit of LDO ............................................................................................ 26
Figure 2–5 Reference circuit of POWER_ON ............................................................................... 27
Figure 2–6 Timing of Turning on Mode ......................................................................................... 28
Figure 2–7 Timing of Turning off Mode ......................................................................................... 29
Figure 2–8 reference circuit to reset module ................................................................................ 30
Figure 2–9 Timing of Reset Mode ................................................................................................ 30
Figure 2–10 Reference Circuit of the 8 Pin USIM Card ................................................................ 32
Figure 2–11 Reference Circuit of the 6 Pin USIM Card ................................................................ 32
Figure 2–12 Molex 91228 USIM Card Holder ............................................................................... 33
Figure 2–13 Amphenol C707 10M006 512 2 USIM Card Holder .................................................. 34
Figure 2–14 Reference Circuit of USB Application .......................................................................... 35
Figure 2–15 Reference Circuit of USB Communication between module and AP ......................... 36
Figure 2–16 Reference circuit of USB when USB is not the desired function ............................... 36
Figure 2–17 Schematic of 8-wire UART Connection..................................................................... 38
Figure 2–18 Schematic of 3-wire UART Connection..................................................................... 38
Figure 2–19 Schematic of 4-wire UART Connection..................................................................... 38
Figure 2–20 Recommended TXD circuit ....................................................................................... 39
Figure 2–21 Recommended RXD circuit ...................................................................................... 40
Figure 2–22 Recommended RTS circuit ....................................................................................... 41
Figure 2–23 Recommended CTS circuit ....................................................................................... 42
Figure 2–24 Recommended 8-wires UART level switch circuit ..................................................... 43
Figure 2–25 Recommended 4-wires UART level switch circuit ..................................................... 44
Figure 2–26 Recommended 2-wires UART level switch circuit ..................................................... 44
Figure 2–27 The test point of debug UART .................................................................................. 44
Figure 2–28 Reference Circuit of the Network Indicator ............................................................... 45
Figure 2–29 ADC internal structure ................................................................................................. 46