mangOH Yellow, Hardware Architecture Manual

Page: 27 / 41

Hardware
Rev 2 Oct.19 27 41113116
Figure 2-16: CF3 module RF Connections
2.4.12 NFC
The mangOH Yellow provides an integrated NFC (Near Field Communication) transponder (U700) and antenna
(ANT700) that connect to the CF3 module via I2C, as shown in
Figure 2-11 on page 24 .
2.4.13 Battery
The mangOH Yellow can be powered by an external 3.7 V rechargeable Li-Ion/Li-polymer battery. The battery
powers the mangOH Yellow if the selected primary power source is not connected (USB or expansion connector),
and recharges automatically if the selected primary power source is connected.
Battery-related components on the mangOH Yellow include:
• External battery connector (CN1000)
• Integrated battery charger (U1000)
• Battery gauge (U1002) that reports the battery’s charge level via I2C to the CF3 module
• Voltage supervisor (U1003) that monitors the battery’s voltage and, when the voltage level is out of range
(<3.1V or >3.6V), will assert RESET_IN to hold the CF3 module in reset until the battery is sufficiently
recharged.
The CF3 module interacts via I2C with both the battery charger and the battery gauge, as shown in Figure 2-11 on
page 24 .
2.4.14 RTC
The mangOH Yellow provides a low power consumption CMOS Real-Time Clock (RTC) (U701) that connects to
the CF3 module via I2C, as shown in
Figure 2-11 on page 24 .
CF3
RF_MAIN
RF_DIV
Main u.FL
(CN307)
Diversity
(CN304)
Integrated
(ANT300)
RF_GPS
GPS u.FL
(CN306)
Integrated
(ANT301)
CELL_ANT_CNTR
GPS_ANT_CNTR