参数资料
型号: UPSD3213B-40T6T
厂商: 意法半导体
英文描述: Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
中文描述: 闪存可编程系统设备与8032微控制器核心和64Kbit SRAM的
文件页数: 97/176页
文件大小: 1081K
代理商: UPSD3213B-40T6T
97/176
μ
PSD323X
Transceiver
USB Physical Layer Characteristics.
The
lowing section describes the
μ
PSD323X Devices
compliance to the Chapter 7 Electrical section of
the USB Specification, Revision 1.1. The section
contains all signaling, and physical layer specifica-
tions necessary to describe a low speed USB
function.
Low Speed Driver Characteristics.
The
μ
PSD323X Devices use a differential output driver
to drive the Low Speed USB data signal onto the
USB cable. The output swings between the differ-
ential high and low state are well balanced to min-
imize signal skew. The slew rate control on the
driver minimizes the radiated noise and cross talk
on the USB cable. The driver’s outputs support
three-state operation to achieve bi-directional half
duplex operation. The
μ
PSD323X Devices driver
fol-
tolerates a voltage on the signal pins of -0.5V to
3.6V with respect to local groundreference without
damage. The driver tolerates this voltage for
10.0
μ
s while the driver is active and driving, and
tolerates this condition indefinitely when the driver
is in its high impedance state.
A low speed USB connection is made through an
unshielded, untwisted wire cable a maximum of 3
meters in length. The rise and fall time of the sig-
nals onthis cable are well controlled to reduce RFI
emissions while limiting delays, signaling skews
and distortions. The
μ
PSD323X Devices driver
reaches the specified static signal levels with
smooth rise and fall times, resulting in segments
between low speed devices and theports to which
they are connected.
Figure 44. Low Speed Driver Signal Waveforms
AI06629
Signal
pins
pass output
spec levels
with
minimal
reflections
and
ringing
One Bit
Time
1.5 Mb/s
V
SS
Driver
Signal Pins
V
SE
(min)
V
SE
(max)
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