4.4. Layout Guidelines. Silicon Laboratories Si2493, Si2404, Si2415, Si2434, Si2494, Si2439, Si2457, Si2443
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A N 9 3
4.4. Layout Guidelines
The key to a good layout is proper placement of the components. It is best to copy the placement shown in
1. All traces, open pad sites, and vias connected to the following components are considered to be in the DAA section and must be physically separated from non-DAA circuits by 5 mm to achieve the best possible surge performance: R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R15, R16, U2, Z1, D1, FB1, FB2, RJ11, Q1, Q2,
Q3, Q4, Q5, C3, C4, C5, C6, C7, C8, C9, C10, RV1, C1 pin 2 only, C2 pin 2 only, C8 pin 2 only, and C9 pin 2 only.
2. The isolation capacitors, C1, C2, C8 and C9, are the only components permitted to straddle between the DAA section and non-DAA section components and traces. This means that for each of these capacitors, one of the terminals is on the DAA side, and the other is not. Maximize the spacing between the terminals (between pin 1 and pin 2) of each of these capacitors.
3. Place and group the following components: U1, U2, R12*, R13*, C1, C2.
*Note: Do not use ferrite beads in place of R12 and R13.
a.U1 and U2 are placed so that the right side of U1 faces the left side of U2.
b.C1 and C2 are placed directly between U1 and U2.
c.Keep R12 and R13 close to U1.
d.Place U1, U2, C1, and C2 so that the minimum creepage distance for the target application is met.
e.Place C1 and C2 so that traces connected to U2 pin 5 (C1B) and U2 pin 6 (C2B) are physically separated from traces connected to: i.C8, R15, FB1 ii.C9, R16, FB2 iii.U2 pin 8, R7 iv.U2 pin 9, R9
4. Place and group the following components around U2: C4, R9, C7, R2, C5, C6, R7, R8. These components should form the critical “inner circle” of components around U2.
a.Place C4 close to U2 pin 3. This is best achieved by placing C4 northwest of U2.
b.Place R9 close to U2 pin 4. This is best achieved by placing R9 horizontally, directly to the north of U2.
c.Place C7 close to U2 pin 15. This is best achieved by placing C7 next to R9.
d.Place R2 next to U2 pin 16. This is best achieved by placing R2 northeast of U2.
e.Place C6 close to U2 pin 10. This is best achieved by placing C6 southeast of U2.
f.Place R7 and R8 close to U2. This is best achieved by placing these components to the south of U2.
g.Place C5 close to U2 pin 7. This is best achieved by placing C5 southwest of U2.
5. Place Q5 next to R2 so that the base of Q5 can be connected to R2 directly.
6. Place Q4 so that the base of Q4 can be routed to pin 13 of U2 easily and the emitter of Q4 can be routed to U2 pin 12 easily. Route these two traces next to each other so that the loop area formed by these two traces is minimized.
7. Place and group the following components around the RJ11 jack: FB1, FB2, RV1, R15, R16, C8, and C9.
a.Use 20-mil-wide traces on this grouping to minimize impedance.
b.Place C8 and C9 close to the RJ11 jack, recognizing that a GND trace will be routed between C8 and C9 back to the Si24xx GND pin through a 20-mil-wide trace. The GND trace from C8 and C9 must be isolated from the rest of the Si3018/10 traces.
c.The trace from C8 to GND and the trace from C9 to GND must be short and of equal lengths.
52 Rev. 1.41
AN93
8. After the previous step, there should be some space between the grouping around U2 and the grouping of components around the RJ11 jack. Place the rest of the components in this area, given the following guidelines: a.Space U2, Q4, Q5, R1, R3, R4, R10 and R11 away from each other for best thermal performance.
b.The tightest layout can be achieved by grouping R6, C10, Q2, R3, R5, and Q1.
c.Place C3 next to D1.
d.Make the size of the Q1, Q3, Q4, and Q5 collector pads each sufficiently large for the transistor to safely dissipate 0.5 W under worst case conditions. See the transistor data sheet for thermal resistance and maximum operating temperature information. Implement collector pads on both the component and solder side, and use vias between them to improve heat transfer for best performance. When ambient conditions are a moderate 50 deg or less, use 0.05 square inches of copper at the collectors of Q1, Q3, Q4, Q5. Both sides of the PCB can be used to double the available area.
9. U2, IGND, is the return path for many of the discrete components and requires special mention: a.Traces associated with IGND should be 20 mils wide.
b.U2's IGND should not be a large ground plane and should only occupy the space under U2. Beyond this area, use traces and avoid getting close to the components on the other side of the diode bridge.
c.C5, C6, C7 IGND return path should be direct.
10.The traces from R7 to FB1 and from R8 to FB2 should be well matched. This can be achieved by routing these traces next to each other as much as possible. Ensure that these traces are not routed close to the traces connected to C1 or C2.
11. Minimize all traces associated with Y1, C40, and C41.
12.Decoupling capacitors (0.22 µF and 0.1 µF capacitors connected to V
DA
, V
DB
, V
DD
) must be placed next to those pins. Traces of these decoupling capacitors back to the Si24xx GND pin should be direct and short.
Figure 20. Reference Placement
Rev. 1.41
53
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Table of contents
- 1 1. Introduction
- 9 1.1. Selection Guide
- 11 2. Modem (System-Side) Device
- 11 2.1. Resetting the Device
- 11 2.1.1. Reset Sequence
- 12 2.1.2. Reset Strapping: General Considerations
- 13 2.1.3. Reset-Strap Options for 16-Pin SOIC Package
- 13 2.1.4. Reset-Strap Options for 24-Pin TSSOP Package
- 14 2.1.4.1. Reset Strapping Options for TSSOP-24 with UART-Interface
- 14 2.1.4.2. Reset Strapping Options for TSSOP-24 with Parallel-Interface
- 15 2.1.4.3. Reset Strapping Options for TSSOP with SPI-Interface
- 15 2.1.5. Reset Strapping Options for QFN Parts
- 15 2.1.5.1. Reset Strapping Options for QFN Parts with UART Operation
- 16 2.1.5.2. Reset Strapping Options for QFN Parts with SPI Operation
- 16 2.1.5.3. Reset Strapping Options for QFN Parts with Parallel Operation
- 17 2.2. System Interface
- 17 2.2.1. Interface Selection
- 19 2.2.2. Interface Signal Description
- 19 2.2.3. UART Interface Operation
- 19 2.2.3.1. UART Options
- 20 2.2.3.2. Autobaud
- 21 2.2.3.3. Flow Control
- 23 2.2.4. Parallel and SPI Interface Operation
- 25 2.2.4.1. Hardware Interface Register
- 25 2.2.4.2. Hardware Interface Register
- 26 2.2.4.3. Parallel Interface Operation
- 28 2.2.4.4. SPI Interface Operation
- 28 2.2.4.5. Interface Communication Modes
- 29 2.3. Isolation Capacitor Interface
- 29 2.4. Low-Power Modes
- 29 2.4.1. Power-Down Mode
- 29 2.4.2. Wake-on-Ring Mode
- 29 2.4.3. Sleep Mode
- 30 2.5. Controlling GPIOs (38-Pin QFN Only)
- 33 2.6. SSI/Voice Mode (24-Pin TSSOP and 38-Pin QFN Only)
- 34 2.7. EEPROM Interface (24-Pin TSSOP and 38-Pin QFN Only)
- 34 2.7.1. Supported EEPROM Types
- 36 2.7.2. Three-Wire SPI Interface to EEPROM
- 36 2.7.3. Detailed EEPROM Examples
- 36 2.7.4. Boot Commands (Custom Defaults)
- 37 2.7.5. AT Command Macros (Customized AT Commands)
- 37 2.7.6. Firmware Upgrades
- 37 2.7.6.1. Boot Command Example
- 38 2.7.6.2. AT Command Macro Example
- 38 2.7.6.3. Autoloading Firmware Upgrade Example
- 39 2.7.6.4. Combination Example
- 41 3. DAA (Line-Side) Device
- 41 3.1. Hookswitch and DC Termination
- 42 3.2. AC Termination
- 42 3.3. Ringer Impedance and Threshold
- 42 3.4. Pulse Dialing and Spark Quenching
- 42 3.5. Line Voltage and Loop Current Sensing
- 45 3.6. Legacy-Mode Line Voltage and Loop Current Measurement
- 45 3.7. Billing Tone Detection
- 46 4. Hardware Design Reference
- 46 4.1. Component Functions
- 46 4.1.1. Power Supply and Bias Circuitry
- 46 4.1.2. Hookswitch and DC Termination
- 46 4.1.3. Clocks
- 47 4.1.4. Ringer Network
- 47 4.1.5. Optional Billing-Tone Filter
- 50 4.2. Schematic
- 51 4.3. Bill of Materials
- 52 4.4. Layout Guidelines
- 54 4.4.1. ISOmodem Layout Check List
- 57 4.4.2. Module Design and Application Considerations
- 57 4.4.2.1. Module Design
- 57 4.4.2.2. Motherboard Design
- 58 4.5. Analog Output
- 58 Required Modem Reset Time
- 59 4.5.2. Audio Quality
- 59 4.5.3. Power Dissipation in the Si3018 DAA
- 61 5. Modem Reference Guide
- 61 5.1. Controller
- 62 5.2. DSP
- 62 5.3. Memory
- 62 5.4. AT Command Set
- 83 5.5. Extended AT Commands
- 95 5.6. S Registers
- 98 5.7. U Registers
- 103 5.7.1. U-Register Summary
- 104 5.7.2. U00–U16 (Dial Tone Detect Filter Registers)
- 105 5.7.3. U17–U30 (Busy Tone Detect Filter Registers)
- 108 5.7.4. U31–U33 (Ringback Cadence Registers)
- 108 5.7.5. U34–U35 (Dial Tone Timing Register)
- 108 5.7.6. U37–U45 (Pulse Dial Registers)
- 109 5.7.7. U46–U48 (DTMF Dial Registers)
- 110 5.7.8. U49–U4C (Ring Detect Registers)
- 110 5.7.9. U4D (Modem Control Register 1—MOD1)
- 112 5.7.10. U4E (Pre-Dial Delay Time Register)
- 112 5.7.11. U4F (Flash Hook Time Register)
- 112 5.7.12. U50–U51 (Loop Current Debouncing Registers)
- 112 5.7.13. U52 (Transmit Level Register)
- 113 5.7.14. U53 (Modem Control Register 2)
- 113 5.7.15. U54 (Calibration Timing Register)
- 113 5.7.16. U62–U66 (DAA Control Registers)
- 115 5.7.17. U67–U6A (International Configuration Registers)
- 119 5.7.18. U6C (Line-Voltage Status Register)
- 119 5.7.19. U6E–U7D (Modem Control and Interface Registers)
- 129 5.7.20. U80 (Transmit Delay for V.22 Fast Connect)
- 130 5.7.21. U87 (Synchronous Access Mode Configuration Register)
- 131 5.7.22. UAA (V.29 Mode Register)
- 133 5.8. Firmware Upgrades
- 133 5.8.1. Method 1 (Fastest)
- 133 5.8.2. Method
- 133 5.8.3. Method
- 134 5.9. Escape Methods
- 134 5.9.1. +++ Escape
- 135 5.9.2. “9th Bit” Escape
- 135 5.9.3. “Escape Pin” Escape
- 136 5.10. Data Compression
- 136 5.11. Error Correction
- 136 5.12. Wire Mode
- 137 5.13. EPOS (Electronic Point of Sale) Applications
- 137 5.13.1. EPOS Fast Connect
- 137 5.13.2. EPOS V.29 Fast Connect
- 137 5.14. Legacy Synchronous DCE Mode/V.80 Synchronous Access Mode
- 138 5.15. V.80 Mode
- 144 6. Programming Examples
- 144 6.1. Quick Reference
- 145 6.2. Country-Dependent Setup
- 145 6.2.1. DC Termination
- 146 6.2.2. Country Configuration
- 146 6.2.2.1. Country Initialization Table
- 157 6.2.2.2. Country-Setting Register Tables
- 158 6.2.2.3. Special Requirements for Serbia and Montenegro
- 159 6.2.3. Blacklisting
- 159 6.3. Caller ID
- 160 6.3.1. Force Caller ID Monitor (Always On)
- 160 6.3.2. Caller ID After Ring Only
- 160 6.3.3. UK Caller ID with Wetting Pulse
- 160 6.3.4. Japan Caller ID
- 160 6.3.5. DTMF Caller ID
- 161 6.4. SMS Support
- 163 6.5. Type II Caller ID/SAS Detection
- 173 6.6. Intrusion/Parallel Phone Detection
- 173 6.6.1. On-Hook Condition
- 173 6.6.1.1. Line Not Present/In Use Indication (Method 1—Fixed)
- 174 6.6.1.2. Line Not Present/In Use Indication (Method 2—Adaptive)
- 174 6.6.2. Intrusion Explanation
- 176 6.7. Modem-On-Hold
- 176 6.7.1. Initiating Modem-On-Hold
- 177 6.7.2. Receiving Modem-On-Hold Requests
- 177 6.8. HDLC: Bit Errors on a Noisy Line
- 181 6.9. Overcurrent Detection
- 181 6.10. Pulse/Tone Dial Decision
- 182 6.10.3. Method 3: Adaptive Dialing
- 182 6.10.4. Automatic Phone-Line Configuration Detection
- 182 6.10.5. Line Type Determination
- 183 6.11. Telephone Voting Mode
- 183 6.12. V.92 Quick Connect
- 184 6.13. Abort the Dialing Operation in Voice Mode
- 185 7. Handset, TAM, and Speakerphone Operation
- 185 7.1. Software Reference
- 185 7.1.1. AT Command Set
- 185 7.1.2. AT+ Extended Commands
-
190
7.1.3.
Commands (DTE-to-DCE) -
191
7.1.4.
Events (DCE-to-DTE) - 191 7.1.4.1. Simple Event Reporting
- 193 7.1.4.2. Complex Event Reporting
- 193 7.1.5. U Registers
- 199 7.2. Voice Reference—Overview
- 199 7.2.1. Abort the Dialing Operation in Voice Mode
- 204 7.3. Si3000 Configuration
- 204 7.3.1. Microphone and Speaker Ports
- 204 7.3.2. Register Settings
- 204 7.3.3. System Voice Modes
- 204 7.3.3.1. TAM Hands-Free
- 204 7.3.3.2. TAM Handset
- 204 7.3.3.3. Speakerphone
- 204 7.3.3.4. Handset
- 204 7.3.3.5. Si3000 Control Register Overview
- 206 7.3.3.6. TAM PSTN
- 207 7.4. Initialization
- 209 7.5. Handset
- 209 7.5.1. Overview
- 209 7.5.2. Handset Configuration
- 211 7.5.3. Call – Automatic Tone Dial
- 211 7.5.4. Call – Manual Off-Hook Tone Dial
- 211 7.5.5. Call – Automatic Pulse Dial
- 211 7.5.6. Answer
- 212 7.5.7. Terminate
- 213 7.5.8. Speakerphone Transition
- 214 7.6. Telephone Answering Machine
- 214 7.6.1. Overview
- 214 7.6.2. TAM Hands-Free—Idle
- 215 7.6.2.1. Record OGM
- 216 7.6.2.2. Review OGM
- 216 7.6.2.3. Record Local ICM
- 216 7.6.2.4. Review ICM
- 216 7.6.2.5. Speakerphone Transition
- 216 7.6.2.6. Handset Transition
- 216 7.6.3. TAM Handset
- 216 7.6.3.1. Record OGM
- 219 7.6.3.2. Review OGM
- 221 7.6.3.3. Record Local ICM
- 221 7.6.3.4. Review ICM
- 221 7.6.4. TAM PSTN
- 221 7.6.4.1. Normal Answer – OGM Playback with ICM Record
- 223 7.6.4.2. Interrupted Answer – OGM Playback with DTMF Menu Entry
- 225 7.6.4.3. Speakerphone Transition
- 225 7.6.4.4. Handset Transition
- 225 7.7. Speakerphone
- 225 7.7.1. Overview
- 225 7.7.2. External Microphone/Speaker Calibration
- 225 7.7.2.1. Transmit Gain Calibration—Speakerphone Disabled
- 228 7.7.2.2. Receive Gain Calibration—Speakerphone Disabled
- 229 7.7.2.3. Speakerphone Calibration—AEC Gain Calibration
- 231 7.7.3. Speakerphone Configuration
- 232 7.7.4. Simplex Speakerphone Configuration
- 233 7.7.5. Call—Automatic Tone Dial
- 233 7.7.6. Call—Manual Off-Hook Tone Dial
- 234 7.7.7. Call—Automatic Pulse Dial
- 234 7.7.8. Answer
- 234 7.7.9. Handset Transition
- 235 7.7.10. Termination
- 235 7.8. Glossary
- 235 7.9. References
- 236 8. Security Protocols
- 236 8.1. Implementing the SIA Protocol
- 236 8.1.1. Modem-Specific Implementation Details
- 236 8.1.1.1. Listen-In and V-channel Periods (Voice Pass-Through)
- 236 8.1.1.2. Inserting a V.32bis period (e.g., SIA Level-3 Video Block Support)
- 237 8.1.1.3. Considerations when Disconnecting the Session
- 240 8.2. Implementing the Ademco® Contact ID Protocol
- 241 8.2.1. Modem Specific Implementation Details
- 242 8.2.1.1. Handshake Tone Detection
- 242 8.2.1.2. Session Example
- 244 9. Chinese ePOS SMS
- 244 9.1. Introduction
- 245 9.2. SMS AT Command Set
- 248 9.2.1. SMS User Registers
- 249 9.2.2. Procedure
- 250 9.2.2.1. Example
- 251 9.2.2.2. Response
- 251 9.2.2.3. Response
- 251 9.2.2.4. Response
- 252 9.3. Example Session
- 255 10. Testing and Diagnostics
- 255 10.1. Prototype Bring-Up (Si3018/10)
- 255 10.1.1. Introduction
- 255 10.1.2. Visual Inspection
- 255 10.1.3. Basic Troubleshooting Steps
- 257 10.1.4. Host Interface Troubleshooting
- 257 10.1.5. Isolation Capacitor Troubleshooting
- 257 10.1.6. Si3018/10 Troubleshooting
- 257 10.1.7. Component Troubleshooting
- 262 10.2. Self Test
- 263 10.3. Board Test
- 265 10.4. Compliance Testing
- 266 10.4.1. EMI
- 267 10.4.2. Safety
- 267 10.4.3. Surges
- 268 10.5. AM-Band Interference
- 269 10.6. Debugging the DTE interface
- 270 Appendix A—EPOS Applications
- 270 VISA II (7E1)
- 271 Recommendation V
- 273 The ISOmodem in EPOS Applications
- 274 A V.29 FastPOS Sample Program
- 286 Appendix B—Line Audio Recording
- 286 When to Use Audio Recording
- 286 Times When Audio Recording May Not Help
- 286 Hardware Setup
- 288 Audio Playback and Analysis
- 297 Examples of Line Impairments
- 302 Appendix C—Parallel/SPI Interface Software Implementation
- 303 Software Description
- 306 Document Change List