37.3.5 Power Saving

To save power consumption, the sensor can stop the image stream. In this case, proceed as follows to enter the image subsystem in Low-power mode:

1. Disable capture in ISC:
   • ISC_CTRLDIS.DISABLE = 1 (to end capture at next vertical synchronization detection)
   • Check ISC_CTRLSR.CAPTURE = 0
2. Power down DPHY:
   • CSI –> CSI2_RESETN = 0
   • CSI –> CSI2_PHY_SHUTDOWNZ = 0
   • CSI –> CSI2_DPHY_RSTZ = 0
3. Reset CSI2DC software:
   • CSI2DC –> CSI2DC_GCTLR = 1

The image subsystem is now in Low-power mode. Proceed as follows to restart the capture:

1. Enable capture in ISC:
   • With color profile update:
     • Write all required configuration registers.
     • ISC_CTRLEN = 0x3 (CAPTURE =1 and UPPRO =1)
   • Without color profile update:
     • ISC_CTRLDIS.CAPTURE = 1
2. Release CSI2DC software reset:
   • CSI2DC –> CSI2DC_GCTLR = 0
3. Enable image pipe:
   • CSI2DC –> CSI2DC_VPER = 1
   • CSI2DC –> CSI2DC_DPER = 1
   • CSI2DC –> CSI2DC_PUR = 0x3
4. Bring DPHY out of power down:
   • CSI –> CSI2_PHY_SHUTDOWNZ = 1
   • CSI –> CSI2_DPHY_RSTZ = 1
   • CSI –> CSI2_RESETN = 1
   • Wait for LP-11 on the clock lane and activate data lanes by probing the CSI2_PHY_STOPSTATE register.