Tx_Ctrl Signal For Tx Burst Indication; Electrical Characteristics; Tx_Ctrl Status - Sierra Wireless WISMO228 Product Technical Specification & Customer Design Manuallines

TX_CTRL Signal for TX Burst Indication

The TX_CTRL signal is a 2.8V indication signal for TX Burst with a 100KΩ pull‐up resistor
implemented inside the WISMO228 module.
WISMO228 State
During TX burst
No TX
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.

Electrical Characteristics

The following table describes the electrical characteristics of the TX_CTRL signal.
Parameters
VOH
VOL
Tadvance
WA_DEV_W228_PTS_002
Table 35. TX_CTRL Status
Low
High
Figure 40. TX_CTRL State During TX Burst
Table 36. Electrical Characteristics of the TX_CTRL Signal
Conditions
@500mA
Rev 001
Product Technical Specification &
Customer Design Guidelines

TX_CTRL Status

Minimum Typical
2.6 -
- -
- 18
Maximum Unit
2.95 V
0.4 V
- µs
Page 81 of 108