SI3215-BT - Programmable SLIC/Codec | Silicon Labs
Référence : SI3215-BT ✓ ActifSI3215-BT Présentation
A SLIC is the analog-facing circuit that connects a telephone line to a digital voice system, while a codec converts between analog voice signals and digital PCM data. The SI3215-BT combines these functions into one programmable device, placing line termination, voice conversion, ringing generation, and battery feeding in a single telecom interface IC.
Programmable internal balanced ringing is one of the device’s principal functions. The ringing engine can operate at 5 REN up to 4 kft or 3 REN up to 8 kft, with a maximum ringing voltage of 90 VPK. DTMF generation, BORSCHT line functions, and expanded support for Japan and China country requirements broaden its applicability to regional analog telephone systems.
An integrated battery supply and dynamically controlled DC-DC converter produce the negative battery voltage required by the line interface. The converter continuously adjusts its operating point to minimize power consumption. According to the manufacturer datasheet, the SI3215 also performs all BORSCHT functions and supports software migration considerations from the earlier Si3210 family.
Typical uses include single-line VoIP adapters, analog terminal adapters, embedded telephony gateways, voice-over-IP endpoint equipment, and legacy telephone interface designs that require PCM or GCI connectivity. The 38-pin TSSOP package is suitable for conventional surface-mount assembly where the system also requires high-voltage ringing and battery circuitry.
Designers must account for the line-side high voltage, isolated ringing requirements, analog impedance matching, digital codec timing, and power-supply sequencing. The exact hook state, DC feed, ringer threshold, and country-specific parameters should be programmed and validated against the target line and network requirements before production release.
This product page combines package, interface, ringing, supply, and application details with practical design considerations for engineers evaluating the SI3215-BT. It also identifies the limitations of cross-reference results so that a replacement is selected only when package, pinout, interface, and telephone-network behavior are confirmed together.
Alternatives de remplacement direct pour SI3215-BT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesSI3215-BT Spécifications
| Product Type | Programmable CMOS SLIC/codec |
| Channel Count | 1 channel |
| Integrated Codec | Yes |
| Supply Voltage Range | 3.13 V to 5.25 V |
| Operating Current | 41 mA |
| Signal Performance | 60 dB |
| Software-Configurable Ringing | Up to 5 REN |
| Maximum Ringing Voltage | 90 VPK |
| Ringing Load at 4 kft | 5 REN |
| Ringing Load at 8 kft | 3 REN |
| Battery Supply | Integrated with dynamic voltage output |
| DC-DC Converter | Integrated on-chip converter |
| Digital Interfaces | GCI, PCM, and SPI |
| Telephone Functions | All BORSCHT functions |
| DTMF Generation | Supported |
| Country Support | Expanded Japan and China requirements |
| Boîtier | 38-pin TSSOP |
| Package Type | Surface-mount gull-wing |
| Temperature Grade | Industrial |
| Total Pin Count | 38 pins |
Guide de configuration des broches du SI3215-BT surface-mount gull-wing
Configuration des broches du SI3215-BT (boîtier surface-mount gull-wing). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour SI3215-BT.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
SI3215-BT convient pour 6 applications: VoIP Analog Phone Adapters, Analog Terminal Adapter, Embedded Telephony Gateways, Legacy PSTN Interface Equipment, Voice Media Gateway, Industrial Telephony Control Panel.
VoIP Analog Phone Adapters
The SI3215-BT fits a single-line VoIP adapter because it combines one subscriber line interface, an integrated codec, DTMF generation, and digital connectivity through PCM, GCI, or SPI. Its 3.13 V to 5.25 V operating range supports conventional embedded telephony equipment, while the listed 41 mA operating current helps control power demand. The programmer can configure BORSCHT behavior and ringing for regional line conditions. The board still requires compliant high-voltage line protection, isolation, impedance matching, and careful separation between telephone-side and low-voltage circuitry.
Recommandé
Analog Terminal Adapter
The SI3215-BT is appropriate for an analog terminal adapter that must present one telephone line while passing voice digitally to a communications processor. Its integrated codec avoids a separate audio conversion block, and the BORSCHT functions support line supervision required by analog endpoints. Programmable ringing up to 90 VPK and 5 REN at 4 kft provides substantial line-loading capability. Engineers should program country-specific ring cadence and line parameters, then verify hook-state, DC-feed, and impedance behavior across temperature and production tolerances.
Recommandé
Embedded Telephony Gateways
The SI3215-BT can serve the analog line side of an embedded telephony gateway where a processor requires PCM or GCI connectivity. Its single-channel architecture matches gateways requiring one subscriber endpoint, while the integrated codec supports direct digital voice transfer. The programmable internal ringing generator provides up to 90 VPK without relying entirely on a discrete ringer source. Thermal and layout planning should account for the TSSOP power dissipation and the separation required between the 90 VPK ringing path and low-voltage digital interfaces.
Recommandé
Legacy PSTN Interface Equipment
The SI3215-BT is designed for legacy public switched telephone network interfaces that require BORSCHT line functions, DTMF generation, DC feed, and integrated ringing. Its software-programmable behavior permits adaptation to different ringing and line conditions, including expanded Japan and China country requirements identified in the manufacturer documentation. A PSTN product must still validate line-loop impedance, overvoltage protection, insulation coordination, and regional approval requirements. Those safety and network tests cannot be replaced by package compatibility alone.
Recommandé
Voice Media Gateway
The SI3215-BT can be used in a voice media gateway that connects a telephone line to a packet or PCM network. The integrated codec simplifies the voice path, while GCI and PCM interfaces provide options for communication with the gateway controller. Its 60 dB listed signal performance supports the device's intended telephony role, and programmable ringing allows the same hardware to be configured for different network requirements. Production validation should include line-state transitions, echo-path margin, ring detection, and synchronization across supported firmware revisions.
Recommandé
Industrial Telephony Control Panel
The SI3215-BT is suitable for an industrial telephony control panel that must support an analog line alongside supervisory and call-progress signaling. Its industrial temperature grade, integrated battery generation, programmable ringing, and complete BORSCHT support align with equipment expected to remain powered continuously. The 38-pin TSSOP package is compatible with conventional PCB assembly, although production designers must manage power dissipation and high-voltage creepage. Firmware configuration should be locked and tested for the selected country, line impedance, and approved ringing profile.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SI3215-BT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SI3215-GT | SI3215-C-FT |
|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | 38-pin TSSOP | 38-pin TSSOP | 38-pin TSSOP |
| Product Type | Programmable CMOS SLIC/codec | SLIC/codec | SLIC/codec |
| Drop-In Status | Reference device | Not confirmed as pin-to-pin compatible | Not confirmed as pin-to-pin compatible |
Principaux différenciateurs
- Integrated telephone subsystem reduces external line-interface blocks (vs SI3201)
- Programmable balanced ringing supports demanding line loads (vs SI3215-GT)
- Complete telephony signaling integration (vs SI3215-C-FT)
- Multiple digital interface options in one interface IC (vs SI3210)
Notes de conception
Separate the telephone-side, battery, and ringing paths from low-voltage codec and control traces. Route high-voltage nets with adequate creepage and clearance for the applicable insulation system, and place transient-protection components near the line interface. Keep the SPI, PCM, and GCI traces away from the line and ringing nodes to reduce capacitive coupling into digital communication.
Design the 3.13 V to 5.25 V supply path and decoupling around the operating modes that generate ringing and battery voltage. Follow the manufacturer datasheet for recommended capacitors, voltage limits, and power sequencing. Because the listed 41 mA operating current does not represent every transient or ringing condition, verify supply droop and converter behavior with worst-case line activity.
Use controlled clocking and grounding for the PCM or GCI connection to the host processor. Confirm input and output timing against the supported firmware and clocking configuration, and keep the codec interface traces short where practical. During validation, test line transitions, ringing activation, and hook-state changes while monitoring SPI and PCM communication for coupling-related errors.
Do not treat SI3215-GT or SI3215-C-FT as drop-in substitutes solely because the package descriptions are similar. Ordering suffixes can change packaging, grade, or configuration, and the cross-reference record indicates that circuit modifications may be required. Compare the complete pin list, electrical limits, ringing configuration, temperature grade, and required software before changing an approved design.
The 38-pin TSSOP must dissipate power generated by the codec, control logic, DC-DC converter, and line-driving functions. Calculate worst-case device dissipation using the actual supply voltage and operating-mode current, then compare the result with the package thermal limits in the manufacturer datasheet. Use adequate copper area and consider system airflow or enclosure temperature when operating continuously.
Informations de conformité
The industrial temperature grade is identified, but no specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declaration was identified. AEC-Q100 is not applicable to this telecom interface device.
