Atmel SpW-10X user manual Electrical Characteristics, DC Characteristics

SpW-10X	Ref.:	UoD_SpW-10X_
SpaceWire Router		UserManual
	Issue:	3.4
User Manual
	Date:	11th July 2008

11. ELECTRICAL CHARACTERISTICS

The electrical characteristics for the SpaceWire router are defined in this section

11.1 DC CHARACTERISTICS

The operating conditions are listed in Table 11-1. For a detailed list of the operating conditions see [AD3].

Table 11-1 Operating Conditions

Symbol	Description	Value	Units
VDD	Supply voltage	3.0 to 3.6	V
TA	Ambient temperature	-55 to +125	°C
PST	Static power (CLK input is static, after reset)	1 max	W
POFF	Total OFF power (static and dynamic): Reset active	1.6 max	W
	power consumption (CLK input with 30 MHz signal,
	RSTN active)
POP(3)	Total operational power with all interfaces active	2.4 max at 10 Mb/s(2)	W
	including external ports.(1)
		3.0 max at 100 Mb/s(2)	W
		3.7 max at 200 Mb/s	W

(1)If a SpW IF is not active (clock and LVDS drivers switched off) assume a reduction of POP by: (POP - POFF) x 0.1 + 0.06;

Example: 2 SpW interfaces deactivated at 200 Mb/s:

Operational power = 3.7 – ((3.7 – 1.6) x 0.1 + 0.06) x 2 = 3.16 W max

(2)For the data rates < 200 Mb/s the setting for the lowest power consumption (i.e. lowest PLL and Tx clock frequency) is assumed.

(3)The actual data flow has a negligible influence on the power consumption (i.e. very little difference if NULLs or SpW packets are transferred).

All power figures in Table 11-1 are for maximum conditions, which means 3.6 V for the supply voltage. If the supply voltage is lower the power consumption sinks as well. The reduction fits to the power consumption with a resistive load. I.e. at 3.0 V the power consumption is 69.4% of the power consumption at 3.6V.

The lowest power consumption at a certain data rate is achieved if the PLL is set to the lowest possible frequency (setting of FEEDBDIV inputs) and the SpW Tx clock to the lowest possible frequency (setting of TXDIV in register) for that SpW data rate.

Preliminary 136