Dear Sir
Good afternoon,
I used the MSP430F479 DAC, found a phenomenon,
it must be initialized twice, so that the output value is stable All products are available at + - 2 LSB.
If the initialization only once, there will be 15% of the products appear tolerance of 3 ~ 5 LSB,
I tried to adjust the timing of DAC12 CALON, but to no avail, I ask, how could this happen?
The following is my test initialization code:
//==========================================================================
// Repeat the following code twice will be stable DAC output..
//===========================================================================
void SD16A_DAC12_ON()
{
SET_AdPower_ON;
SD16CTL = SD16REFON+SD16VMIDON+SD16SSEL0+SD16DIV_3; // 1.2V ref, MCLK/8, Vref buffer ON
SD16CCTL0 = SD16SNGL+SD16BUF_3; // 0~32787, high speed current
__delay_cycles(614754);// delay cycles times
DAC12_0CTL = DAC12IR + DAC12SREF_3 + DAC12AMP_5 + DAC12OPS + DAC12ENC + DAC12CALON; // DAC12AMPx = 5 , Input Buffer Medium speed/current ; Output Buffer = Medium speed/current
DAC12_0DAT = g_uiDigiDAC0;
__delay_cycles(614754);// delay cycles times
}
//=================================================================================
thanks a lot.
Wilson_WT
