MatchX LPWAN, Руководство пользователя

Страница: 8 / 41

8 Chapter 2. Hardware Architecture - SoM module
Pin
num-
ber
Name Description
1 V3P3_LDO 3.3V output of the internal LDO
2 GND Ground
3 VDD_RFS Supply voltage of the radio front-end
4 LED1 Open drain output type, LED driver
5
LED2 Open drain output type, LED driver
6 LED3 Open drain output type, LED driver
7 RESET Reset signal, active high
8 P1_6 General Purpose I/O P1_6 / NTC resistor for battery temperature sensing
9 P1_4 General Purpose I/O P1_4 / ADC1 / battery temperature sensing
10 P4_2 General Purpose I/O P4_2
11 P4_3 General Purpose I/O P4_3
12 P2_3 General Purpose I/O P2_3
13 P1_3 General Purpose I/O P1_3 / ADC2
14 P0_7 General Purpose I/O P0_7 / ADC3
15 SWD_DIO Serial Wire Debug interface I/O signal / GPIO P0_6 / ADC4
16 SWD_CLK Serial Wire Debug interface clock signal / GPIO P2_4 / ADC7
17 P3_3 General Purpose I/O P3_3
18 P3_4 General Purpose I/O P3_4
19 P3_2 General Purpose I/O P3_2
20 VBATT Battery voltage input
21 GND Ground
22 VBUS 5V supply, charging voltage
Table 2.1: USB-C connector pins description.
The module can be powered in two ways:
1. By connecting the VBATT to a battery voltage (2.7V to 4.2V).
2. By sup5V on the VBUS pin.
If both power sources are present, the battery will be charged form +5V power supply. The charging
current and charging characteristics for different battery types is software configurable. The module
provides
V3P3_LDO voltage, it is a output of internal LDO of the DA14680 MCU, and it can be
used to supply external devices, but the maximum current drawn can’t be grater than 100mA. By
default
VDD_RFS is connected to V3P3_LDO with an external 0R resistor. The current draw of
VDD_RFS is around 35mA during transmission with +14dBm power output and around 90mA
with +17dBm power. This has to be taken in consideration when planning the power budget of
V3P3_LDO . When even higher RF transmission power is required it is advisable to use different
power source for VDD_RFS . On the Evaluation Board it can be done by using 3.3V output of the
low power converter.
The source of V3P3_LDO is VBUS when present or VBATT otherwise. As it is a output of a
LDO, when VBUS is not present, and VBATT drops below 3.3V the V3P3_LDO will follow the
battery voltage. By default all GPIO are referenced to V3P3_LDO (it is also possible to configure
1.8V as the GPIO level, each GPIO can be configured individually) so care must be taken to ensure