PCM1865: Power-Down Mode Settings

Hello,

I'd like to know about the right procedure to have PCM1865 go into power-down mode. The supply voltages of the PCM1865 are 3.3 V.

Questions

1. The section 13.3.77 of the data sheet says 01110b must always be written to RSV bits [7:3] of the register 112 (0x70) while the example in the section 11.5.1 shows 0x70=0x14 that writes 00010b to the RSV bits. Which is correct?
2. The PCM1865's current consumption in power-down mode becomes different between the above two procedures. It's about 1.5 mA (4.95 mW) when 01110b is written to the RSV bits while it's roughly 0.4 mA (1.32 mW) when 00010b is set. This result indicates that the bits[6:5] of the register 112 makes the difference. What's the function of these bits?
3. The PCM1865's current consumption in power-down mode won't go down as low as 0.59 mW as written in the section 11.5.1. The section 7.6 Electrical Characteristics: DC also specifies the typical total power of 0.644 mW under AVDD = DVDD = IOVDD = 3.3 V in standby mode for software device. What is correct?
   • Measurement results
     • 4.95 mW according to the section 13.3.77 (01110b to RSV bits of the register 112)
     • 1.32 mW according to the section 11.5.1 (00010b to RSV bits of the register 112)
   • Data sheet descriptions
     • 0.59 mW in the section 11.5.1
     • 0.644 mW (typical) in the section 7.6 Electrical Characteristics: DC

Best regards,
Shinichi Yokota