Hardware Guide
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FIBOCOM MC116-NA Series Hardware Guide Page 22 of 63
Table 4-2 shows the filter capacitors design of power supply:
Table 4-2 Filter capacitors design of power supply
Recommended Capacitor
Application Description
220uF×2 Regulating capacitor
Reduce power fluctuations during
module operation, requiring low ESR
capacitor
LDO or DCDC power requires not
less than 440uF capacitor
Battery power can be properly
reduced to 100uF ~ 220uF capacitor
1uF, 100nF Digital signal noise
Filter clock and digital signal
interference
33pF 700, 850/900MHz bands Filter low band RF interference
8.2pF
1700/1800/1900, 2100/2300,
2500/2600MHz bands
Filter middle/high band RF
interference
The power stability can ensure the normal operation of MC116-NA module. The power supply ripple limit
for the module is no more than 300mV (the circuit ESR < 100mΩ) requires special attention when design
circuit. The power voltage needs to be at least 3.3V. Otherwise, the module may power off or restart. The
power limit is shown in Figure 4-2:
Burst transmit Burst transmit
min:3.3V
VBAT
Ripple≤300mV
Drop
VBAT≥3.3V
Figure 4-2 Power limit
4.3 1.8V Output
The MC116-NA series module outputs a 1.8V voltage through the VDD_EXT for the use of the internal
digital circuit of module. The voltage is the logic level of the module and can be used to indicate module
Power on/off, or for external low current (< 80mA) circuits. Leave the signal floating if no use. The logic