NETUSPS1 - Quad power supply module

NETUSPS1 is a power supply module designed to meet the power-up and power-down sequence requested by the Atmel AT91SAM9G20 CPU used on NETUSG20 module

Features

Pinout

Pin Line in/out Notes
1-2 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 5 Volts 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 sequences

Each power-out line have to follows a timing sequence, any deviation from these sequences may lead excessive current consumption during power-up or freeze the device while booting:

Power-up sequence

Power-down sequence

1V0 power out is the first to start, when it reaches 0.5 Volts, the other two power out line 1V8 and 3V3 go on.

These two power lines reach 0,7 Volts within 50 us and become steady up well within 300 us.

The POK signal is generated by an on-board power supervisor chip (CAT811TTBI) when the VCC input (5 Volt DC) is stable.

The 3V3 and 1V8 power out line switchs off at the same time of 1V0 voltage.

NETUSPS1
EUR 10.00


Quad power supply module

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

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