XE8805AMI028LF Semtech, XE8805AMI028LF Datasheet - Page 131
XE8805AMI028LF
Manufacturer Part Number
XE8805AMI028LF
Description
IC DAS 16BIT FLASH 8K MTP 64LQFP
Manufacturer
Semtech
Datasheet
1.XE8805AMI028LF.pdf
(156 pages)
Specifications of XE8805AMI028LF
Applications
Sensing Machine
Core Processor
RISC
Program Memory Type
FLASH (22 kB)
Controller Series
XE8000
Ram Size
512 x 8
Interface
UART, USRT
Number Of I /o
24
Voltage - Supply
2.4 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
64-LQFP
Supply Voltage Range
2.4V To 5.5V
Operating Temperature Range
-40°C To +85°C
Digital Ic Case Style
LQFP
No. Of Pins
64
For Use With
XE8000MP - PROG BOARD AND PROSTART2 CARD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
XE8805AMI028LF
Manufacturer:
SEMTECH/美国升特
Quantity:
20 000
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18.7 4-20mA loop
18.7.1
The amplifier can be used to build a 4-20mA loop externally. Figure 18-4 shows the principle of such a 2-wire loop
using a first order low pass filter.
In a 2-wire loop, the current consumption of the sensor and read-out electronics is drawn on the same wires as the
signal current. The current consumption of the sensor and read-out electronics should therefore remain below
4mA. The signal current is then added by the bipolar transistor. The resistors R
the bipolar transistor against high transient currents during power-up. R
of R
If V
up to the 4mA budget, a component with sufficiently low quiescent current has to be selected.
The resistor R
the gain and R
that the code 0 of the D/A corresponds to 4mA. The amplifier will force a current through the bipolar transistor so
that the voltage on the filter V
I
© Semtech 2006
loop
XE88xx
=(VSS-V
EXT
lim2
is larger than 5.5V, a voltage regulator has to be inserted. Since the quiescent current of the regulator adds
is chosen as a function of the external loop voltage V
R
lim
2-wire loop with first order filtering
EXT
2
=
sense
-)/R
f2
o
n
o
c
t
r
l
(
V
and C
sense
EXT
measures the total current in the loop (if R
.
−
f
V
to set the bandwidth of the filter. The resistor R
D
CEsat
f
−
and VSS on R
R
A
sense
Figure 18-3. Second order low pass filter.
⋅
20
amp
mA
)
sense
20
mA
is equal. This transforms the filter voltage into a loop current
DAS_AI_M
DAS_AI_P
DAS_OUT
18-10
DAS_AO
EXT
sense
and the transistor saturation voltage V
<<R
analog ground
f2
). The resistors R
R
nR
mC
lim1
offset
is generally set to a few kΩ. The value
adds an offset to the filter voltage so
kR
C
lim1
and R
f1
lim2
and R
XE8805/05A
are added to protect
f2
are used to set
www.semtech.com
CEsat
.
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