Maestro A2200-A User Manual download pdf (Page 17)

V1.0 – Aug-13

User’s Manual

Page 17 of 37

For self-start mode, full power operation will be activated once Vcc applied. No power

saving mode (PTF/MPM/Hibernation) will be supported. While using external

EEPROM or SPI Flash power supervision chip (Maxim, MAX809SEUR+T) is

mandatory in order to prevent any memory corruption if the Vcc removes abruptly.

3.6 Configure the baud rate

Baud rate and protocol selection can be set upon start up through GPIO configura-

tion.A2235-H can be configured to output NMEA at standard baud rates, if

the A2235-H is using the UART host interface.

Table 4 lists the settings for GPIO 0 and GPIO 1 to configure the baud rate at start-up.

After start-up, the GPIOs can be used for other purposes.

GPIO 0 (I2C_DIO)

GPIO 1(I2C_CLK)

Protocol

Baud Rate

Pull high

NMEA

4800

Pull high

Pull low

NMEA

9600

Pull low

Pull high

NMEA

38400

Pull low

OSP

115200

Remark: Pull high/low =2.2K

Table 4: GPIO 0 and GPIO 1 Settings

Note: This feature is not available if any MEMS or non-volatile memory devices

are attached to the auxiliary serial bus. The internal software default baud rate

is NMEA 4800 when an EEPROM is connected.

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Maestro A2200-A User Manual Page 17