Pl3307 Electrical Information; Power Supply Requirements - Motorola PL3307 Integration Manual

2 - 4 PL3307 Decoder Integration Guide

PL3307 Electrical Information

Power Supply Requirements

The PL3307 decoder board can be powered from one of three possible sources: Host 3.3 VDC, Host 5 VDC, or
Micro USB 5 VDC. The PL3307 uses an intelligent hardware multiplexer to configure the most efficient power
supply arrangement for the combined PL3307/imager engine system.
supply multiplexer.
PL3307
SUPPLY
SOURCES
5V DC
Host
Connector
5V DC
Micro USB
Connector
3.3V DC
Host
Connector
PL3307 Power Supply Multiplexer
Figure 2-2
The multiplexers are low resistance switches that automatically select between A and B inputs. If both inputs
are present (e.g., Host 5 VDC and Host 3.3 VDC) the A input takes precedence.
This arrangement allows powering the PL3307 using 3.3 V, 5 V, or combined supply voltages that offer
improved efficiency for the overall system due to the different supplies that the PL3307 decoder and imager
engine require internally.
NOTE Host 5 VDC and Micro USB 5 VDC can not be applied simultaneously to the PL3300 input as these lines
are tied together internally.
PM Supply
A
B
A
3.3V
B
REG
AT91Power Control
Figure 2-2 shows a block diagram of the
ENGINE
INTERFACE
Illumination
Power
3.3V or 5V
Engine Power
Enable
(AT91 GPIO)
Sensor and
Microcontroller
Power
AT91
GPIO Supply
3.3V