參數(shù)資料
型號(hào)： SI3225PPTX-EVB
廠商： Silicon Laboratories Inc
文件頁數(shù)： 42/112頁
文件大?。?/td> 0K
描述： BOARD EVAL W/DISCRETE INTERFACE
設(shè)計(jì)資源： Si3225PPTX-EVB Schematics/Layout
標(biāo)準(zhǔn)包裝： 1
系列： ProSLIC®
主要目的： 接口，模擬前端（AFE）
已用 IC / 零件： Si3225
已供物品： 板，CD
Si3220/25 Si3200/02
Rev. 1.3
35
Not
Recommended
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ew
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s
Figure 16. Adaptive Linefeed V/I Behavior
When the Si3220/Si3225 is used with the Si3200/2
linefeed device, the source impedance of the dc feed is
640
before the adaptive linefeed transition and 320
after the adaptive linefeed transition, as shown in
Figure 16. On the other hand, when the Si3220/Si3225
is used with a discrete bipolar transistor linefeed, the
source impedance of the dc feed is 320
both before
and after the adaptive linefeed transition.
The loop closure thresholds are programmable via the
LCROFFHK and LCRONHK RAM addresses. The
LCRLPF
RAM
address
provides
filtering
of
the
measured loop current, and the LCRDBI RAM address
provides de-bouncing. The LCR status bit in register
LCRRTP indicates when a loop closure event has been
page 45 for additional details.
3.4.2. On-Hook to Off-Hook Transition
Referring to Figure 16, point 1 represents the open-
circuit voltage (VOC = –48 V) of the dc feed. At point 1,
the source impedance of the dc feed is 640
(320 for
discrete
bipolar
transistor
linefeed)
and
VTIP/
RING = VOC, since no current flows in the loop. When
a dc load is connected across TIP and RING and as dc
current begins to flow in the dc loop, the product of the
dc loop current and the 640
source impedance
(320
for a discrete bipolar transistor linefeed) causes
the
VTIP/RING
voltage
to
decline
linearly
with
increasing loop current. When the VTIP/RING voltage
reaches the VOCLTH threshold (point 2), adaptive
linefeed switches the source impedance of the dc feed
to 320
and simultaneously boosts the value of VOC
by VOCDELTA (point 3). The source impedance of the
dc feed will now remain at 320
until the programmed
current limit (ILIM) is reached (point 4). At point 4, the dc
feed has entered into the constant current mode of
operation.
Adaptive linefeed can be disabled by writing a value of
zero into the VOCDELTA RAM address. Writing a value
of zero to VOCDELTA simply eliminates the apparent
VOC
voltage
boost
associated
with
a
non-zero
VOCDELTA value. With VOCDELTA = 0 in the case of
the Si3200/2, the adaptive linefeed transition still
changes the source impedance from 640
to 320 ,
and there is a corresponding discontinuity at the
0
10
20
30
40
50
60
70
0.005
0.01
0.015
0.02
0.025
Iloop (A)
Vt
ip/
ri
n
g
(
V
)
320 Ohms
VOCHTH
VOCLTH
VOCDELTA
1
6
2
3
5
4
10 kOhms
2450 Ohms
1930 Ohms
1800 Ohms
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