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WA_DEV_W218_PTS_002 Rev 005 Page 76 of 109
Product Technical Specification &
Customer Design Guidelines
TX_CTRL Signal for TX Burst Indication
Features
The TX_CTRL signal is a 2.8V indication signal for TX Burst with a 100K pull-up resistor
implemented inside the WISMO218 module.
Table 33. TX_CTRL Status
WISMO218 State
TX_CTRL Status
During TX burst
Low
No TX
High
During TX burst, there will be higher current drain from the VBATT power supply which causes a
voltage drop. This voltage drop from VBATT is a good indication of a high current drain situation
during TX burst.
The blinking frequency is about 216Hz.
The output logic low duration, Tduration, depends on the number of TX slots and is computed as
follows:
Tduration = Tadvance + (0.577ms x number of TX slots) + Tdelay.
Figure 36. TX_CTRL State During TX Burst
Table 34. Electrical Characteristics of the Signal
Parameter
Condition
Minimum
Typ.
Maximum
Unit
V
OH
2.6
-
2.95
V
V
OL
-
-
0.4
V
T
advance
@500mA
-
18
-
µs
@1A
-
27
-
µs