B&B Electronics RS-232 to Ethernet Converter ES1A Especificaciones Pagina 28
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Valorado. / 5. Basado en revisión del cliente
Si3216
28 Rev. 1.0
Not Recommended
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2.1.2. Linefeed Architecture
The ProSLIC is a low-voltage CMOS device that uses
either an Si3201 linefeed interface IC or low-cost
external components to control the high voltages
required for subscriber line interfaces. Figure 17 is a
simplified illustration of the linefeed control loop circuit
for TIP or RING and the external components used.
The ProSLIC uses both voltage and current sensing to
control TIP and RING. DC and ac line voltages on TIP
and RING are measured through sense resistors R
DC
and R
AC
, respectively. The ProSLIC uses linefeed
transistors Q
P
and Q
N
to drive TIP and RING. Q
DN
isolates the high-voltage base of Q
N
from the ProSLIC.
The ProSLIC measures voltage at various nodes in
order to monitor the linefeed current. R
DC
, R
SE
, and
R
BAT
provide access to these measuring points. The
sense circuitry is calibrated on-chip to guarantee
measurement accuracy with standard external
component tolerances. See 2.1.9."Linefeed Calibration"
on page 33 for details.
2.1.3. Linefeed Operation States
The ProSLIC linefeed has eight states of operation as
shown in Table 22. The state of operation is controlled
using the Linefeed Control register (direct Register 64).
The Open state turns off all currents into the external
bipolar transistors and can be used in the presence of
fault conditions on the line and to generate Open Switch
Intervals (OSIs). TIP and RING are tri-stated with a dc
output impedance of about 150 k
. The ProSLIC can
also automatically enter the Open state if it detects
excessive power being consumed in the external bipolar
transistors. See 2.1.5."Power Monitoring and Line Fault
Detection" on page 30 for more details.
In the Forward Active and Reverse Active states,
linefeed circuitry is on, and the audio signal paths are
disabled. In the forward and reverse on-hook
transmission states, audio signal paths are enabled to
provide data transmission during an on-hook loop
condition.
The TIP Open state turns off all control currents to the
external bipolar devices connected to TIP and provides
an active linefeed on RING for ground start operation.
The RING Open state provides similar operation with
the RING drivers off and TIP active.
The Ringing state drives programmable ringing
waveforms onto the line.
2.1.4. Loop Voltage and Current Monitoring
The ProSLIC continuously monitors the TIP and RING
voltages and external BJT currents. These values are
available in registers 78–89. Table 23 on page 30 lists
the values that are measured and their associated
registers. An internal A/D converter samples the
measured voltages and currents from the analog sense
circuitry and translates them into the digital domain. The
A/D updates the samples at an 800 Hz rate. Two
derived values are also reported—loop voltage and loop
current. The loop voltage, V
TIP
–V
RING
, is reported as a
1-bit sign, 6-bit magnitude format. For ground start
operation, the reported value is the RING voltage. The
loop current, (I
Q1
– I
Q2
+ I
Q5
–I
Q6
)/2, is reported in a 1-
bit sign, 6-bit magnitude format. In RING open and TIP
Open states, the loop current is reported as (I
Q1
– I
Q2
) +
(I
Q5
–I
Q6
).
- Features 1
- Applications 1
- Description 1
- Functional Block Diagram 1
- 2 Rev. 1.0 2
- TABLE OF CONTENTS 3
- 1. Electrical Specifications 4
- 8 Rev. 1.0 8
- Rev. 1.0 11 11
- 12 Rev. 1.0 12
- Rev. 1.0 13 13
- 14 Rev. 1.0 14
- Parameter 17
- Symbol Test Condition 17
- Max Unit 17
- Figure 9. SPI Timing Diagram 19
- Si3216(M) 20
- Rev. 1.0 21 21
- Rev. 1.0 23 23
- Component (s) Value Supplier 25
- , 1/10 W, ±5% 25
- 26 Rev. 1.0 26
- 2. Functional Description 27
- 2.1.2. Linefeed Architecture 28
- . The ProSLIC can 28
- Rev. 1.0 29 29
- Parameter Description/ 31
- Resolution Register 31
- Location* 31
- Closure Detection 32
- Switching 33
- 34 Rev. 1.0 34
- Figure 19. V 35
- in the Forward Active State 35
- 2.3. Tone Generation 36
- Tone Generator 1 38
- Tone Generator 2 38
- 2.4. Ringing Generation 39
- 2.4.2. Sinusoidal Ringing 40
- 2.4.3. Trapezoidal Ringing 40
- Location 40
- T=1/freq 41
- Figure 23. Ring Trip Detector 42
- 2.5. Audio Path 43
- 44 Rev. 1.0 44
- Rev. 1.0 45 45
- 2.7. Clock Generation 46
- 2.8. Interrupt Logic 46
- Rev. 1.0 47 47
- 48 Rev. 1.0 48
- 2.10. PCM Interface 49
- 50 Rev. 1.0 50
- Rev. 1.0 51 51
- 3. Control Registers 52
- Rev. 1.0 53 53
- 54 Rev. 1.0 54
- Rev. 1.0 55 55
- CALM1 CALM2 CALDAC CALADC 55
- 56 Rev. 1.0 56
- Rev. 1.0 57 57
- 58 Rev. 1.0 58
- Rev. 1.0 59 59
- 60 Rev. 1.0 60
- Rev. 1.0 61 61
- 62 Rev. 1.0 62
- Rev. 1.0 63 63
- 64 Rev. 1.0 64
- Rev. 1.0 65 65
- 66 Rev. 1.0 66
- Rev. 1.0 67 67
- 68 Rev. 1.0 68
- Rev. 1.0 69 69
- 70 Rev. 1.0 70
- Rev. 1.0 71 71
- 72 Rev. 1.0 72
- Rev. 1.0 73 73
- 74 Rev. 1.0 74
- Rev. 1.0 75 75
- 76 Rev. 1.0 76
- Rev. 1.0 77 77
- 78 Rev. 1.0 78
- Rev. 1.0 79 79
- 80 Rev. 1.0 80
- Rev. 1.0 81 81
- 82 Rev. 1.0 82
- Rev. 1.0 83 83
- 84 Rev. 1.0 84
- Rev. 1.0 85 85
- 86 Rev. 1.0 86
- Rev. 1.0 87 87
- 88 Rev. 1.0 88
- Rev. 1.0 89 89
- 90 Rev. 1.0 90
- Rev. 1.0 91 91
- 92 Rev. 1.0 92
- Rev. 1.0 93 93
- 94 Rev. 1.0 94
- Rev. 1.0 95 95
- 96 Rev. 1.0 96
- Rev. 1.0 97 97
- 98 Rev. 1.0 98
- Rev. 1.0 99 99
- 100 Rev. 1.0 100
- Rev. 1.0 101 101
- 102 Rev. 1.0 102
- Rev. 1.0 103 103
- 4. Indirect Registers 104
- Rev. 1.0 105 105
- 106 Rev. 1.0 106
- Rev. 1.0 107 107
- 108 Rev. 1.0 108
- Rev. 1.0 109 109
- 5. Pin Descriptions: Si3216 110
- Rev. 1.0 111 111
- 112 Rev. 1.0 112
- 6. Pin Descriptions: Si3201 113
- 7. Ordering Guides 114
- Rev. 1.0 115 115
- 116 Rev. 1.0 116
- Rev. 1.0 117 117
- 118 Rev. 1.0 118
- Rev. 1.0 119 119
- DOCUMENT CHANGE LIST 120
- Rev. 1.0 121 121
- CONTACT INFORMATION 122
- Mouser Electronics 123
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