Rf Synchronization Signal; Antenna Interface - SimCom SIM800 Hardware Design

Table 32: KPLED specification
Pin name
KPLED

4.19. RF Synchronization Signal

The synchronization signal serves to indicate growing power consumption during the transmit burst.
Table 33: Definition of the RF_SYNC pin
Pin name
RF_SYNC
Note: Do not pull up RF_SYNC.
The timing of the synchronization signal is shown in the following figure. High level of the RF_SYNC signal
indicates increased power consumption during transmission.

4.20. Antenna Interface

SIM800_Hardware Design_V1.10
Module
KPLED
Figure 44: KPLED driver reference circuit
Min Typ
-
Pin number Description
67 Transmit synchronization signal
220us
Transmit burst
RF_SYNC
Figure 45: RF_SYNC signal during transmit burst
48
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VBAT
Max
60
577us
Unit
mA
2018-08-13