10.1 Power Management

To minimize the power consumption of customer application, SNx5DP149 uses dual power supply. V_CC is 3.3-V with 10% range to support the I/O voltage. The V_DD is 1.00-V to 1.27-V range to supply the internal digital control circuit. SNx5DP149 operates in two different working states. See Table 14 for conditions for each mode. When OE is deasserted and then reasserted the device will rest to its default configurations. If different configurations were programmed using I²C then the device will have to be reprogrammed.

• Power-down mode:
  • OE = Low puts the device into its lowest power state by shutting down all function blocks
    • When OE is re-asserted the transitions from L → H will create a reset and if the device is programmed through I²C it will have to be reprogrammed.
    • OE = High, HPD_SNK = Low
    • Writing a 1 to register 09h[3]
• Normal operation: Working in redriver or retimer
• When HPD asserts, the device CDR and output will enable based on the signal detector circuit result
• HPD_SRC = HPD_SNK in all conditions. The HPD channel operational when V_CC over 3-V.

Table 14. Control Logic and Mode of Operation

INPUTS(1)		STATUS						MODE
HPD_SNK	OE	Mode of Operation	HPD_SRC	IN_Dx	SDA_CTL SCL_CTL	OUT_Dx OUT_CLK	DDC
H	L	X	H	High-Z	Disabled	High-Z	Disabled	Power-down mode
L	H	X	L	High-Z	Active	High-Z	Disabled	Power-down mode
H	H	X	H	High-Z	Active	High-Z	Disabled	Power-down mode when a one is written to 09h[3]
H	H	Redriver	H	RX active	Active	TX active	Active	Normal operation
H	H	Retimer	H	RX active	Active	TX active	Active	Normal operation

(1) L = LOW, H = HIGH

TMDS output termination control impacts the operating power.