includes common-mode ratings of 1500 V rms between input
and output and input and power, 250V rms between power and
output – no return path is required between the power and
signal output commons.
Accurate and Stable Performance
– The 5B42 maintains
accuracy over the wide operating temperature range of -40
o
C to
+85
o
C through design for low parameter drift. This enables the
module to provide output offset drift of only +5 uV/
o
C and gain
drift of just +25 ppm/
o
C
Why an Internal Current Sense Resistor?
– The 5B42 offers
significant advantages over signal conditioners that require an
external current sense resistor. First, an external resistor is not
protected from accidental connection to a 240 V rms power
line. Next, the external resistor tolerance must be added to the
.
conditioners specified errors. In contrast, the 5B42 is calibrated
and specified with its internal 25Ω sense resistor. Further, the
5B42 signal input, loop supply and the sense resistor are all
protected against accidental application of excess voltages up to
240V rms. Finally, there is no need to install an external sense
resistor on the backplane, but if one is installed it will not affect
5B42 performance.
Filtering and Protection
– The 5B42 contains an optimized
five-pole low-pass filter with a -3 dB bandwidth at 100Hz that
provides a low-overshoot step response and exceptionally low
noise of 200 uV pk-pk in a 100kHz bandwidth. Attenuation
(normal mode rejection) increases at a 90 dB/decade rate
beyond 100 Hz.
The module protects the computer side from damage due to
field-side over-voltage faults. The module withstands 240 V rms
at the input terminals without damage, thereby shielding the
internal computer-side circuitry from field-side over-voltage
conditions. In addition, the 5B42 is mix-and-match and hot-
swappable with all other 5B Series modules, so can be inserted
or removed from any socket in the same backplane without
disrupting system power.
A series output switch eliminates the need for external
multiplexing in many applications. The switch is turned on by
an active-low enable input. If the switch is to be on at all times,
the enable-input should be grounded to power common as it is
on the 5B01 and 5B08 backplanes..
.
Figure 2
Rev. 0 | Page 2 of 8
5B42
5B42 Models Available
Model
5B42-01
5B42-02
5B42-Custom
* Custom Input/Output ranges are available.
4 mA to 20 mA
4 mA to 20 mA
*
Input Range
Output Range
+1 V to +5 V
+2 V to +10 V
*
5B42 Specifications
(typical @ +25°C and V
s
= +5 V dc)
Description
Input Ranges
Standard Ranges
Custom Ranges
Isolated Loop Supply Voltage
Output Ranges (R
L
> 50 k
Ω)
4 mA to 20 mA (Refer to Model Table)
0 mA to 20 mA (Refer to Ordering Section)
20 V @ 4 mA to 20 mA Input
+1 V to +5 V; +2 V to +10 V
Accuracy
1
Initial @ +25°C
Nonlinearity
Input Offset vs. Temperature
Output Offset vs. Temperature
Gain vs. Temperature
Input Sense Resistor
2
±0.05% Span ±4 µA RTI
±0.01% Span
±0.5 µV/°C
±5 µV/°C
±0.0025% of Reading/°C
25
Ω
Noise
Input, 0.1 Hz to 10 Hz Bandwidth
Output, 100 kHz Bandwidth
Bandwidth, -3 dB
Output Step Rise Time, 10% to 90% Span
10 nA rms
200 µV peak-peak
100 Hz
4 ms
Common-Mode Voltage (CMV)
Output-to-Input, Continuous
Input-to-Power, Continuous
Output-to-Power, Continuous
3
Transient
1500 V rms, maximum
1500 V rms, maximum
250 V rms, maximum
ANSI/IEEE C37.90.1-1989
Common Mode Rejection (CMR)
1 k
Ω
Source Imbalance, 50/60 Hz
Normal Mode Rejection (NMR)
140 dB
-3 dB @ 100 Hz (90 dB per decade > 100 Hz)
Input, Excitation, and Sense Resistor Protection
Continuous
Transient
240 V rms, maximum
ANSI/IEEE C37.90.1-1989
Rev. 0 | Page 3 of 8
Model 5B42
5B42
Output Resistance
Voltage Output Protection
Output Current Limit
Output Selection Time
25
Ω
Continuous Short to Ground
±20 mA
6 µs to ±1 mV of V
out
@ C
load
= 0 to 2,000 pF
Output Enable Control
3
Max Logic "0"
Min Logic "1"
Max Logic "1"
Input Current "0", "1"
Power Supply Voltage
+0.8 V
+2.4 V
+36 V
0.5 µA
+5 V dc ±5%
Power Supply Current
@ Transmitter Load of 20 mA
@ Transmitter Load of 4 mA
Power Supply Sensitivity, RTI
Mechanical Dimensions
200 mA
100 mA
±1 µV/% of V
s
2.275" x 2.375" x 0.595"
(57.8 mm x 59.1 mm x 15.1 mm)
Environmental
Temperature Range
Rated Performance
Operating
Storage
Relative Humidity
RFI Susceptibility
1
2
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0 to 95% @ +60°C, non-condensing
±0.5% Span error @ 400 MHz, 5 Watt, 3 ft
Includes the combined effects of repeatability, hysteresis, and nonlinearity error. Loads heavier than 50 k
Ω
will degrade nonlinearity and gain temperature coefficient.
A precision 25
Ω
current-sense input resistor is internal to the 5B42 - refer to block diagram.
3
The user's board layout must separate Power Common from Output Common. When the output switch is not used, connect the Enable Input to the Output Common. Output
common is connected to power common when the 5B42 is installed on a 5B Series backplane.
Specifications subject to change without notice.
Rev. 0 | Page 4 of 8
5B42
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 5B42 Input Field Connections
Table 1. Pin Function Descriptions—
Pin No.
3
4
Description
+IN
+EXC
Figure 4 . Model 5B Series Module, with pin-out assignments.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human
body and test equipment and can discharge without detection. Although this product features proprietary ESD
protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges.
Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
问题描述：使用STM32 cube生成usart2 DMA direct mode(不使用FIFO，normal模式，STM32f407)配置代码，usart2可以使用阻塞方式发送，使用DMA发送则只能发送第一次，复位后还只能发送一次。 单步调试发现DMA方式下的发送在发送第一次之后，husart- State 标志变为 HAL_USART_STATE_BUSY就再也不变了。比较直接的解...[详细]
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