18
I/O Voltage
Table 3-2
VDD=3.3 V, VSS=0 V, T=23°C
Parameter
Minimum
Maximum
Unit
VIL
-0.3
0.8
V
VIH
2.0
3.6
V
VOL
VSS
0.4
V
VOH
2.4
VDD
V
Timing Sequence
Power Up and Power Down Timing Sequence
Figure 3-1
1. In the diagram above, it takes
A+B
(about 970ms) for the engine to power up:
A
is reset time (about 298ms),
B
is time
needed to start the engine (including bootloader execution, kernel boot and decoding chip initialization). The engine is
ready to receive commands via its serial/USB port after the power-up sequence completes.
2.
C
is the time it takes to power down the engine (during power-down, all voltages in the engine ramp down, with all
communication stopped and all signals at a low level). To ensure that all voltages are fully down and signals on the
interfaces at a low level, the minimum interval between removing and resupplying the power must exceed 700ms.
Содержание NLS-EM2037 V4
Страница 1: ...NLS EM2037 V4 OEM Scan Engine Integration Guide...
Страница 4: ......
Страница 13: ...7 Mechanical Mounting Dimensions for the All in one Type Unit mm Front View Figure 2 2 Bottom View Figure 2 3...
Страница 14: ...8 Side View Figure 2 4 Mechanical Mounting Dimensions for the Imager Unit mm Front View Figure 2 5...
Страница 15: ...9 Top View Figure 2 6 Bottom View Figure 2 7 Side View Figure 2 8...
Страница 20: ...14 SR version Horizontal Vertical Figure 2 13...
Страница 21: ...15 HD version Horizontal Vertical Figure 2 14...
