u-blox MAX-7 Series - Page 32

MAX-7 / NEO-7 / LEA-7 - Hardware Integration Manual
GPS.G7-HW-11006-1 Design
Page 32 of 55
3.4.3.4 External active antenna supervisor using customer uP (NEO-7N, MAX-7Q, MAX-7C)
Figure 28: External active antenna supervisor using ANT_ON
RFVcc
R
RR
R
I
bias
_
32
2
•






+
=
Equation 2: Calculation of threshold current for open circuit detection
For recomended parts, see section 3.5.
3.4.3.5 External active antenna control (NEO-7N, MAX-7Q, MAX-7C)
The ANT_ON signal can be used to turn on and off an external LNA. This reduces power consumption in Power Save Mode (Backup
mode).
Figure 29: External active antenna control (MAX-7Q / MAX-7C)
For recomended parts, see section 3.5.