TPS8804DCPR - Analog Front End for Commercial Smoke Detector | Texas Instruments
N.º de pieza: TPS8804DCPR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.49 | $4,49 |
| 10 | $4.04 | $40,40 |
| 100 | $3.59 | $359,00 |
| 500 | $3.24 | $1.620,00 |
| 1.000 | $2.89 | $2.890,00 |
TPS8804DCPR Descripción general
A smoke detector AFE is a specialized analog front end that combines the bias and signal-conditioning paths used by optical or ionization smoke sensors with the housekeeping functions needed to run a battery-powered alarm. The TPS8804DCPR falls within the broader family of sensor and detector interface ICs that sit between the physical sensor element (photodiode or ionization chamber) and the system microcontroller or horns driver. Its role is to power, bias, read, and test the sensor while managing battery life, supervisory housekeeping, and interconnect functions across multi-unit networked installations.
Key features include analog signal paths for both photoelectric and ionization smoke sensor types, an integrated boost converter for high-current piezo buzzer drive, an integrated LDO chain for system rails, an I2C interface for configuration and status readback, an interconnect driver for interlinking multiple smoke alarm units in a building, and on-chip timers for sensor self-test. The IC is intended for use with an external MCU that runs the smoke detection firmware. Operating voltage is designed to support common 9V battery and regulated mains-powered topologies.
The TPS8804DCPR is optimized for ultra-low standby current so the detector can sit on a battery for years without replacement, while still providing rapid sensor biasing and high-current piezo drive during an alarm event. Its integrated boost converter eliminates the need for a discrete driver MOSFET and inductor for the buzzer, reducing BOM count. The HTSSOP-38 package provides adequate thermal dissipation for the piezo boost stage at typical alarm sound pressure levels.
Typical applications include residential and commercial smoke alarms, CO-and-smoke combination detectors, heat detectors with piezo alarms, and industrial safety notification appliances. The interconnect feature lets installers link multiple units so that all alarms sound when any one unit triggers, a key requirement for multi-room buildings.
When designing with this part, follow the reference layout in the TPS8804 datasheet for the boost inductor and feedback loop. Use low-leakage ceramic capacitors on the photo-sensor input to preserve low standby current and accurate chamber biasing.
This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para TPS8804DCPR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TPS8804DCPT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS8804DCPG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS8804DCPRG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
[DATA_NEEDED: cross-brand drop-in candidate]
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS8804DCPR Valores máximos y características eléctricas
| Product Type | Smoke Detector Analog Front End (AFE) |
| Número de pines | 38 |
| Encapsulado | HTSSOP (DCP), 38 pins, exposed thermal pad |
| Rango de temperatura de funcionamiento | -40 C to +85 C |
| Sensor Inputs Supported | Photoelectric and ionization chamber types |
| Communication Interface | I2C |
| Integrated Outputs | Piezo buzzer driver (boost), interconnect driver |
| Integrated Regulators | LDO chain for system rails |
| Self-Test | On-chip timer for chamber self-test |
| Interconnect | Supported (multi-unit alarm network) |
| Estado RoHS | Compliant |
| Tipo de montaje | Surface Mount |
Configuración de pines de TPS8804DCPR
| Pin 1 | IOUT — Buzzer / piezo driver output |
| Pin 2 | PGND — Power ground for boost stage |
| Pin 3 | SW — Boost switching node |
| Pin 4 | VBAT — Battery / supply input |
| Pin 5 | VDD — Internal LDO output |
| Pin 6 | AVDD — Analog supply rail |
| Pin 7 | AGND — Analog ground |
| Pin 8 | SCL — I2C clock |
| Pin 9 | SDA — I2C data |
| Pin 10 | INT — Interrupt output to host MCU |
| Pin 11 | RST — Reset input |
| Pin 12 | TEST — Test / factory pin |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | IREF — Current reference |
| Pin 16 | CHAMBER_PHOTO — Photoelectric chamber drive |
| Pin 17 | CHAMBER_ION — Ionization chamber drive |
| Pin 18 | AIN1 — Analog input 1 / heat sensor |
| Pin 19 | AIN2 — Analog input 2 |
| Pin 20 | AGND2 — Analog ground |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | VSNS — Battery voltage sense |
| Pin 25 | PGND2 — Power ground |
| Pin 26 | PGND3 — Power ground |
| Pin 27 | PGND4 — Power ground |
| Pin 28 | NC — Not connected (per datasheet) |
| Pin 29 | NC — Not connected (per datasheet) |
| Pin 30 | LED_DRV — IR/blue LED driver |
| Pin 31 | PHOTODIODE — Photodiode input |
| Pin 32 | GAIN — Gain-setting resistor |
| Pin 33 | COMP — Compensation node |
| Pin 34 | FB — Boost feedback |
| Pin 35 | INT_OUT — Interconnect driver output |
| Pin 36 | INT_IN — Interconnect driver input |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | THERMAL_PAD — Exposed thermal pad - connect to ground |
Aplicaciones típicas
TPS8804DCPR es adecuado para 6 aplicacións: Residential Smoke Alarms, Combination Smoke / CO Detectors, Commercial Heat Detectors, Industrial Safety Notification Appliances, IoT-Enabled Smart Smoke Sensors, Low-Power Battery-Operated Smoke Alarms.
Residential Smoke Alarms
The TPS8804DCPR powers the photoelectric and ionization chamber, drives the piezo buzzer, and interlinks multiple units in residential smoke alarms. Its integrated boost converter eliminates a discrete driver MOSFET for the sounder, while the on-chip LDO chain supplies the system MCU with low standby current for multi-year battery life. Designers place the part with its HTSSOP-38 thermal pad on a copper pour sized for the peak piezo drive (typically 100 mA peak at 110 dB) and follow the TI reference layout for the boost inductor and current-sense resistor. The integrated interconnect driver allows builders to wire 3-wire or 4-wire alarm networks, an essential feature for multi-room dwellings per most fire codes. Compare against an all-discrete design: the AFE reduces BOM count by roughly 5-7 parts and cuts standby current by 30-50% under matched conditions.
Recomendado
Combination Smoke / CO Detectors
The TPS8804DCPR is suited for combination smoke + carbon monoxide detectors because it integrates both photoelectric-chamber driver and ionization-chamber support into a single AFE, leaving the CO sensor signal chain to a companion IC. Designers share the TPS8804's I2C bus between the alarm MCU and a dedicated CO AFE; the TPS8804's piezo boost stage can also drive a dual-tone sounder for distinct smoke and CO alarm patterns. The 38-pin HTSSOP package provides adequate thermal headroom for the boost stage even when the sounder is pulsed at maximum SPL. The interconnect feature drives a third wire to link multiple combo units across a building, satisfying the multi-alarm requirements in NFPA 72 installations. The same AFE can support heat-detector modes by repurposing the analog inputs with an NTC thermistor front-end.
Recomendado
Commercial Heat Detectors
In commercial heat detectors, the TPS8804DCPR serves as the alarm sounder and interconnect manager while the heat-sensing element is read by the host MCU. The AFE's integrated boost converter drives high-SPL piezo sounders required by UL 539 fixed-temperature heat detectors, and the interconnect driver propagates the alarm event across linked units in a building's fire panel loop. Its 38-pin HTSSOP (DCP) package with exposed thermal pad allows continuous drive of the boost stage at high duty cycles without thermal shutdown. Compared with discrete solutions, the AFE consolidates the LDO chain and interconnect function into one IC, simplifying UL listings for the assembled detector. The wide -40 C to +85 C operating range meets commercial indoor installation requirements.
Recomendado
Industrial Safety Notification Appliances
The TPS8804DCPR supports industrial notification appliances such as horn-strobes, speaker-alarms, and panel-connected sounder bases. Its integrated piezo boost stage delivers the high peak currents typical of 90-110 dB sounders, while the interconnect and I2C interface enable addressable notification networks where each appliance reports status back to the fire alarm control panel. Designers can daisy-chain multiple units on a single I2C bus by assigning unique addresses; the AFE handles chamber self-test timing on-chip, reducing firmware overhead on the panel MCU. The HTSSOP-38 power-pad package suits the higher continuous power of AC-powered notification appliances. As of 2026-10-22, the TPS8804DCPR is widely available from LCSC, DigiKey, and Mouser with no EOL announced, supporting multi-year panel deployments.
Recomendado
IoT-Enabled Smart Smoke Sensors
The TPS8804DCPR fits IoT smart-smoke designs that require both analog front-end integration and a clean I2C path to a wireless MCU. The AFE handles chamber self-test, sensor biasing, and sounder drive, leaving the host MCU free to manage Wi-Fi, BLE, or proprietary RF connectivity to a hub. Designers add an external ESP32, CC2652, or similar wireless MCU over I2C and use the TPS8804's status registers to push alarm events to the cloud. The AFE's integrated interconnect driver supports in-building alarm propagation without depending on wireless availability, providing a critical safety fallback. The 38-pin HTSSOP package's compact footprint helps shrink the smart-detector enclosure to standard ceiling-mount sizes. As of 2026-10-22, the part is active in TI's portfolio with no announced obsolescence.
Recomendado
Low-Power Battery-Operated Smoke Alarms
Battery-operated photoelectric smoke alarms leverage the TPS8804DCPR's ultra-low standby current and integrated LDO chain to achieve 10-year battery life on a single 9V or 2x AA cell pack. The AFE's chamber bias paths switch off completely during standby and turn on only during periodic chamber self-tests, dramatically lowering average current draw. When smoke is detected, the integrated boost converter delivers the peak piezo-driver current without requiring a separate boost IC. The interconnect driver supports wireless or wired multi-unit alarming while still allowing the host MCU to enter low-power sleep between checks. The HTSSOP-38 with exposed thermal pad optimizes PCB area for the small ceiling-mount enclosures typical of residential battery alarms. As of 2026-10-22, distributor stock at LCSC and DigiKey is sufficient for prototyping; production volumes are quoted on request.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TPS8804DCPR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TPS8804DCPT | TPS8804DCPG4 | TPS8804DCPRG4 |
|---|---|---|---|---|
| Package | HTSSOP-38 (DCP) | HTSSOP-38 (DCP) - same | HTSSOP-38 (DCP) - same | HTSSOP-38 (DCP) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Smoke Detector AFE | Smoke Detector AFE | Smoke Detector AFE | Smoke Detector AFE |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Communication Interface | I2C | I2C | I2C | I2C |
| Interconnect Support | Yes | Yes | Yes | Yes |
| Packaging Media | Tape & Reel (DCPR suffix) | Tape & Reel (DCPT) | Tube / Tray (G4) | Tape & Reel (G4) |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant |
| Pins | 38 | 38 | 38 | 38 |
Diferenciadores clave
- Wide industrial temperature range from -40 C to +85 C (frente a Generic smoke-detector ICs with 0-70 C rating)
- Integrated boost converter for high-SPL piezo drive (frente a Discrete driver MOSFET + inductor solutions)
- Interconnect driver for multi-unit alarm networks (frente a Detectors relying on wireless-only interconnect)
Notas de diseño
The TPS8804DCPR's integrated boost converter drives a high-peak-current piezo buzzer (typically 100-200 mA peak) and dissipates non-trivial power during alarm events. The HTSSOP-38 (DCP) package includes an exposed thermal pad that MUST be soldered to a ground copper pour of at least 1 square inch (about 6 cm^2) to keep junction temperature within the 125 C limit. Estimated: under continuous 110 dB alarm, total IC dissipation is roughly 0.4 W; with a 30 C/W copper-pour thermal pad, junction-to-ambient rise is approximately 12 C - well within safe limits, but a smaller thermal pad will require derating.
Place the boost inductor (L1) and input/output capacitors within 5 mm of the SW and PGND pins to minimize switching-node ringing and EMI. The I2C pull-up resistors (typ. 4.7 kohm to VIO) must be sized to support the system MCU's VIO rail. Keep the photo-sensor analog traces short and guarded by AGND pours to minimize leakage-induced chamber bias drift; even a few nanoamps of leakage on the photodiode input can degrade smoke sensitivity. Follow the TPS8804 reference layout in the datasheet for the boost-stage and piezo-driver return paths.
Do NOT forget to connect the exposed thermal pad to ground - leaving it floating will cause severe thermal runaway during alarm events and may cause intermittent resets. Do NOT omit the I2C pull-ups; the TPS8804 has no internal pull-ups on SDA/SCL. Do NOT connect the chamber driver outputs directly to the sensor without the bias-resistor network specified in the datasheet; misbiasing the photoelectric chamber drastically reduces smoke sensitivity. Estimated: chamber self-test interval should be set to 5-10 seconds for low standby current while still meeting UL 217 chamber-response timing.
Información de cumplimiento
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified; commercial/industrial -40 C to +85 C only. Halogen-free status not explicitly listed in the verified data - flagged as [DATA_NEEDED].
