AN2491 datasheet(21/32 Pages) STMICROELECTRONICS

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AN2491

User scenarios

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6.2

SPI mode

// STW8110x declaration

t_stw8110x_Config Device_config;

t_stw8110x_error st_error;

double Fout;

// Device Driver Initilization

STW8110x_Init(&Device_config);

//******* Configuration I **********

// Set configuration structure of device

// Config set to ouput frequency 4467.1875MHz reference clock 60MHz

Device_config.DEFAULT_CONFIG = BOOL_FALSE;

Device_config.DEVICE_FUNCTIONAL_MODE = VCO_B_DIRECT_OUTPUT;

Device_config.VCO_CALIBRATION_EN = VCO_CAL_ENABLED;

Device_config.SWALLOW_COUNTER = 11;

Device_config.MAIN_COUNTER = 501;

Device_config.REF_CLOCK_DIV_RATIO = 128;

Device_config.VCO_AMPLITUDE_VOLTAGE = AMPL_2V1;

Device_config.CHARGE_PUMP_CURRENT = CURRENT_8_I_MIN;

Device_config.PRESCALER_MODULUS = PRESCALER_19;

st_error = STW8110x_Get_Fout_value(Device_config,60,&Fout);

if(st_error != OK)

{

STW8110x_ProcessError(st_error);

}

// Configure the device

st_error = Configure_STW8110x(Device_config);

if(st_error != OK)

{

STW8110x_ProcessError(st_error);

}

//******* Config II: Set in Power Down mode **********

// Set configuration structure of device

Device_config.DEFAULT_CONFIG = BOOL_FALSE;

Device_config.DEVICE_FUNCTIONAL_MODE = POWER_DOWN;

// Configure the device

st_error = Configure_STW8110x(Device_config);

if(st_error != OK)

{

STW8110x_ProcessError(st_error);

}

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