My customer need assistance.
Wiring as follows: AinP connected to analog voltage input; AinN to grounding; AGnd is connected to analog ground; Vbias is floating; CS connected to MCU; DSYNC connected to + 5V; Xin input 2MHz active crystal oscillator signal; Xout is floating; DGND to digital grounding; DVDD is connected to + 5V; SCLK\ SDIO\ SDOUT\ DRDY are connected to MCU; MODE to analog ground; AVDD connected to + 5V; REFin and REFout are grounded through capacitors.
According to the datasheet, if the voltage rising rate at 50V / s, ADS1212 will be automatically initialized. I failed, DRDY remained high. And I used the method recommended from datasheet, to input special SCLK signal. But I failed, DRDY remained high). The SCLK pulse time was 512txin < T1 < 800txin; 10txin < t2; 1024txin < t3 < 1800txin; 2048txin < t4 < 2400txin. I set the time as: T1 = 350us; t2 = 20us; t3 = 700us; T4 = 1100us (ADS1212 crystal oscillator 2MHz); No data was written to the CMR register (For DRDY never low).
Please help. Thanks.