- 您现在的位置：买卖IC网 > PDF目录358627 > 33390 (Motorola, Inc.) Class B Serial Transceiver PDF资料下载
参数资料
| 型号： | 33390 |
| 厂商： | Motorola, Inc. |
| 英文描述： | Class B Serial Transceiver |
| 中文描述： | B级串行收发器 |
| 文件页数： | 11/16页 |
| 文件大小： | 450K |
| 代理商： | 33390 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33390
11
Receiver Protocol
The Class B communication scheme uses a variable pulse
width (VPW) protocol. The microcontroller provides the VPW
decoding function. Once the receiver detects a transition on Rx,
it starts an internal counter. The initial “start of frame” bit is a
logic [1] and lasts 200 μs. For subsequent bits, if there is a bus
transition before 96 μs, one logic state is inferred. If there is a
bus transition after 96 μs, the other logic state is inferred. The
“end of data” bit is a logic [0] and lasts 200 μs. If there is no
activity on the bus for 280 μs to 320 μs following a broadcast
message, multiple unit nodes may arbitrate for control of the
next message. During an arbitration, after the “start of frame” bit
has been transmitted, the secondary node transmitting the
most consecutive logic [0] bits will be granted sole transmission
access to the bus for that message.
Loss of Assembly Ground Connection
The definition of a loss of assembly ground condition at the
device level is that all pins of the 33390, with the exception of
BUS and LOAD, see a very low impedance to V
BAT
.
The LOAD pin of the device has an internal transistor switch
connected to it that is normally saturated to ground. This pulls
the LOAD-side of the external resistor (tied from BUS to LOAD)
to ground under normal conditions. The LOAD pin switch is
essentially that of an “upside down” FET, which is normally
biased “on” so long as module ground is present and biased
“off” when loss-of-ground occurs. When a loss of assembly
ground occurs, the load transistor switch is self-biased “off”,
allowing no more than 100 μA of leakage current to flow in the
LOAD pin. During such a loss of assembly ground condition, the
BUS and LOAD pins exhibit a high impedance to V
BAT
; all other
pins will exhibit a low impedance to V
BAT
. During this condition
the BUS pin is prevented from sourcing any current or loading
the bus, which would cause a corruption of any data being
transmitted on the bus. While a particular assembly is
experiencing a loss of ground, all other assembly nodes are
permitted to function normally. It should be noted that with other
nodes existing on the bus, the bus will always have some
minimum/maximum impedance to ground as shown in Table 1,
page 10.
Loss of Assembly Battery Connection
The definition of a loss of assembly battery condition at the
device level is that the V
BAT
pin of the 33390 sees an infinite
impedance to V
BAT
, but there is some undefined impedance
between these pins and ground.
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
相关PDF资料 |
PDF描述 |
|---|---|
| 333G25PP580R | POLYPROPYLENE-FOIL SELF CASED AXIAL LEADS |
| 333GD | 5.0 MM ROUND TYPE LED LAMPS |
| 333HD | 5.0 MM ROUND TYPE LED LAMPS |
| 335824B00034 | TAPE Attachment Method |
| 33661 | LIN Enhanced Physical Interface |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 33390 010250 | 功能描述:HOOK-UP STR 1/0AWG SILICONE 制造商:belden inc. 系列:* 零件状态:在售 标准包装:1 |
| 3339-00 | 制造商:PEREGRINE 制造商全称:PEREGRINE 功能描述:3.0 GHz Integer-N PLL for Low Phase Noise Applications |
| 33391 | 功能描述:CUBITRON DISC 制造商:3m 系列:* 零件状态:在售 标准包装:6 |
| 3-3391 | 制造商:MAYTAG 功能描述: |
| 3339-11 | 制造商:PEREGRINE 制造商全称:PEREGRINE 功能描述:3.0 GHz Integer-N PLL for Low Phase Noise Applications |
发布紧急采购，3分钟左右您将得到回复。