M20 EVB User Guide
3.8.1 J1 test points
Figure 13: J1 test points
Table 10: Pins of J1
Pin Signal I/O Description
1 VDD_EXT O
Supply 2.8V voltage for external
circuit
2 RXD1 I Receive data
3 PWRKEY I Turn on/off the module
4 TXD1 O Transmit data
5 EMERG_OFF I
Shutdown the power in case of
emergency
6 CTS1 O Clear to send of Serial Port 1
7 VCHG I
Voltage input for the charge circuit
8 RTS1 I Request to send of Serial Port1
9 VBAT I Power supply for module
10 GND Digital ground
M20_EVB_UGD_V1.01 - 19 -
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