Trenz Electronic GmbH Support Forum

Q: What are the differences between GlobalTop FGPMMOPA6B (PA6B) and GlobalTop FGPMMOPA6C (PA6C)?

There are some common and some different features.

Common features:

• size: 16.0 x 16.0 x 6x2 mm
• nominal acquisition sensitivity: -148 dBm
• nominal tracking sensitivity: -165 dBm
• typical cold start time: 35 s
• typical hot start time: 1 s
• pins: Vcc, GND, Vbackup, 3D-fix, GND, TX, RX

Different features:

feature / model	PA6B	PA6C	unit	notes
chip	MT3329	MT3339	-	MediaTek
supply voltage	3.2 3.3 5.0	3.0 3.3 4.3	V	min typ max
current consumption	48 37	25 20	mA	@ 3.3V, 1 Hz update rate, acquisition @ 3.3V, 1 Hz update rate, tracking
back-up current consumption	10	7	µA	@ 3.0 V, 25 °C
shut-down current consumption	15	not available	µA	25 °C
timing accuracy	100	10	ns	PA6B needs custom firmware to reprogram 3D-fix output as 1PPS
RX high	2.1 2.8	2.0 Vcc	V	min max
RX low	0.0 0.9	0.0 0.8	V	min max
TX high	2.1 2.8	2.4 2.8	V	min max
TX low	0.0 0.8	0.0 0.4	V	min max
pins	enable Dplus Dminus 2 x NC	2 x NC 3 x GND	-	-

Pin-out comparison

pin / model	PA6B	PA6C	row
1	Vcc	Vcc	1
2	enable	NC	1
3	GND	GND	1
4	Vbackup	Vbackup	1
5	3D-fix	3D-fix	1
6	Dplus	1PPS	1
7	Dminus	NC	1
8	GND	GND	1
9	TXD	TXD	1
10	RXD	RXD	1
11	NC	GND	2
12	-	GND	2
13	NC	GND	2

In addition, please read the following post:
"Features peculiar to GlobalTop GPS receivers based on MediaTek MT3339 chip"
http://forum.trenz-electronic.de/index.php/topic,163.0.html