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Quad Power Supply Module for Netus G20 US$35.50

NETUSPS1
Quad Power Supply Module for Netus G20


This power supply module meets all the AT91SAM9G20 CPU power requirements and power-up and power-down sequences to guarantee reliable operations.

The AT91SAM9G20 CPU used on the Netus G20 module requires a power-up and power-down sequence to guarantee reliable operations. Any deviation from these sequences may lead to excessive current consumption during power-up or prevent the device from booting.

Moreover, a 1.8-volt BGA RAM is used to reduce the power consumption enabling low-power modes due to the mobile nature of the SDRAM used, so NetusG20 requires three different voltages -- 1.0, 1.8 and 3.3 volts -- to work.

This additional power supply module makes it easier to design a Netus G20 application board.

NetusPS1 schematic

Netus PS1 pinout:

Pin line in/out Notes
1 and 2 3V3 powerout main 3V3 out for Netus G20 power and peripherals who need to be powered at the same time of the Netus G20. Max current available for peripherals: 500mA
3 1V0 powerOut main 1V0 out for Netus G20. Not for powering other peripherals
4 1V8 powerOut main 1V8 out for Netus G20. Not for powering other peripherals
5 5V powerIN main input voltage 5Volts stabilized (connected also to pin 14)
6 GND ground ground (connected also to pins 9 and 15)
7 IN2 powerIN input for the spare Low DropOut regulator (normally connected to 5V)
8 PGD signalOUT output showing the 5V input is now stable
9 GND ground ground (connected also to pins 6 and 15)
10 OUT2 powerOUT output for the spare Low DropOut regulator (factory trimmed to 3.25V). Max power deliverable 250mA
11 EN2 signalIN enable input active High (+5V) for the spare Low DropOut regulator
12 POK signalOUT output signaling that the NetusPS1 outputs 3V3, 1V8 and 1V0 are now permitted to start (see figure 3)
13 SHDN signalIN shutdown input (active Low) When lowered to ground NetusPS1 outputs 3V3, 1V8 and 1V0 are switched off. Releasing this pin will restart the correct power up sequence for those three power outputs
14 VCC powerIN main input voltage 5Volts stabilized (connected also to pin 5)
15 GND ground ground (connected also to pins 6 and 9)
16 3V3Aux powerOUT auxiliary 3V3 power output always present even when SHDN is lowered to ground

Power-up sequence:


The image above shows the output voltages of the NetusPS1 power supply powering a NetusG20 board. You can see that when the POK signal (generated by the NetusPS1 itself) raises, the three voltages 1V0, 1V8 and 3V3 start to power up the Netus board. On the image below, there is an enlargement of the power-up sequence where it is possible to see that the 1V0 voltage is the first to start. When 1V0 reaches 0.5 Volts, the other two voltages (1V8 and 3V3) are enabled to start by the logic inside NetusPS1 itself. 3V3 and 1V8 reach 0.7 Volts within 50Ás and become steady well within 300Ás as per the Atmel AT91SAM9G20 specifications.



Power-down sequence:


Here above is the power-down sequence for the NetusPs1 powering a NetusG20 board. You can see that 3V3 and 1V8 are switched off at the same time as 1V0 voltage, per Atmel requirements.


This product was added to our catalog on Friday 27 November, 2009.

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