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
