Maestro A2100-A Manual de usuario descargar pdf (Pagina 16)

V1.3 – Jul-12 User’s Manual Page 16 of 32

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. If later firmware

changes are considered in a design it is necessary to connect the BOOTSEL pin of

the A2035-H. BOOTSEL pin is used to control the mode of operation mentioned 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

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Maestro A2100-A Manual de usuario Pagina 16