Power Interfaces J4, J6, Vccsb, Pson

Chapter 3

Hardware

Power Interfaces (J4, J6)

The ReadyBoard 700 uses various voltages onboard, but only one voltage is required externally (+5 volts) through the external connector, which uses a 4-pin header with 0.200” spacing. The optional +12V volts is also provided on the input connector, but is not used on the board except for LCD panel power and for PCI or ISA bus power. All other onboard voltages are derived from the externally supplied +5 volts DC +/- 5%. The onboard voltages also provide the CPU core voltages.

Power In Interface (J4)

Table 3-27 list the pin outs and signals for Power interface connector (J4).

Table 3-27. Power Interface Pin/Signal Descriptions (J4)

Pin #	Signal	Description
1	+5V	+5.0 volts DC +/- 5%
2	GND	Ground
3	GND	Ground
4	+12V	This +12V is for bus power and LCD power only (optional).

Notes: The shaded area denotes power or ground. The +12V on the Power Interface connector (J4) is used for the LCD panel, PCI Bus and ISA Bus power, and is usually supplied externally.

Power-On Interface (J6)

The signals on this connector allow the ATX power supply to be turned off (soft off) by the ReadyBoard. If you use a non-ATX power supply (lab supply or AT power supply) you must connect J6 pin-1 to +5V (from the power interface connector, J4) to enable the ReadyBoard 700 to power on completely. However, if you use a non-ATX power supply, you won’t have the soft off feature normally provided by ATX power supplies.

Table 3-28. Power-On Header Pin/Signal Descriptions (J6)

Pin #	Signal	Description
1	VCCSB	+5V suspend voltage (+5V, 100mA Standby) – This voltage is supplied
		from ATX power supply. This voltage is required for normal operation.
2	GND	Ground
3	PS_ON*	Power Supply On – This signal is sent to the ATX power supply by the
		ReadyBoard 700 to turn On the ATX power supply. This signal can also
		be used to turn Off the ATX power supply or go into a suspended or
		standby state.

Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

NOTE	If the +5V suspend voltage is not present on the Power-On header
	(J6, pin-1) the ReadyBoard 700 will not completely power on. The
	board will have power (+5V), but it will not start the boot process
	and therefore will never power up completely.
	If you do not use an ATX power supply, you will have to provide
	the standby voltage (+5V) to J6 for the soft off function. Typically,
	this means shorting the +5V (pin-1, J4) to J6, pin-1.

ReadyBoard 700

Reference Manual

Chapter 3