V1.4
– Apr-13
User’s Manual
Page 16 of 34
3.2 Antenna
The A2035-H through the LNA connected to a ceramic passive GPS patch antenna.
3.3 Serial Port Settings
The default configuration within the custom-specific GPS firmware is:
Serial 0 (NMEA) 4800 baud, 8 data bits, no parity, 1 stop bit, no flow control
3.4 Improved TTFF
In order to improve the TTFF (Time To First Fix), it is recommended to keep Vcc
supplied at all times. This will allow taking advantage of sophisticated low power
mode features of the SiRFstarIV chip set. More details can be found in chapter
“Application Notes”.
3.5
Firmware Updates
(Flash-based module only)
Firmware upgrade function is only valid for Flash-based module.
3.5.1 Hardware Bootstrap
We do recommend this type of procedure for firmware upgrade and it should be
considered in the design before hand as it is necessary to connect the BOOTSEL pin
of A2035-H. BOOTSEL pin is used to control the mode of operation on table below:
BOOTSEL
Operating mode
Leave open
Normal operation
Pull up to 1.8V
Boot loader active for firmware upgrade
Table 4: BOOTSEL operating mode
A specific tool (SiRFFlash) is required for firmware upgrade upon request to Maestro.
Recommended circuitry on application board was indicated below.
Figure 7: BOOTSEL application
