POWER SUPPLY REQUIREMENT
PX1120S requires a stable power supply, avoid ripple on VCC pin (<50mVpp). Power supply noise can affect the
receiver’s sensitivity. Bypass capacitors of 10uF and 0.1uF is recommended to be placed close to the module VCC pin;
the values could be adjusted according to the amount and type of noise present on the supply line.
BACKUP SUPPLY
The purpose of backup supply voltage pin (V_BCKP) is to keep the SRAM memory and the RTC powered when the
module is powered down. This enables the module to have a faster time-to-first-fix when the module is powered on
again. The backup current drain is less than 15μA. In normal powered on state, the internal processor access the SRAM
and current drain is higher in active mode
1PPS OUTPUT
A 1 pulse per second signal (100msec HIGH duration) is generated on 1PPS pin when the receiver has 3D position fix
using 4 or more satellites. The rising edge of the pulse is aligned with UTC second, with accuracy of about 10nsec. It
outputs constant LOW when no position fix is available initially.
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