component
TSS721ADR
Public Made by Adomby adom
Texas Instruments Interface - Specialized, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownTSS721ADR
Texas Instruments · Interface - Specialized · SOIC-16
TSS721ADR from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BUSL2 | bidirectional | Meter-Bus differential line for power and data communication, receives bus voltage 10.8V to 42V in receiver mode, polarity independent. |
| 2 | VB | power_in | Rectified bus voltage supply from internal bridge rectifier delivering bus voltage less 1.5V rectifier drop, minimum 9.3V for receive operation. |
| 3 | STC | power_in | Support capacitor connection charged by internal constant current source CS1 to 3.8V to 7.5V with 1.8V voltage drop, stores energy for 3.3V regulator. |
| 4 | RIDD | input | Current adjustment input for STC charge current; external resistor 13kΩ to 80kΩ sets ISTC via voltage divider producing 1.23V to 1.33V at pin. |
| 5 | PF | output | Power fail output indicating critical bus voltage condition when VVB falls below VSTC + 0.3V, output 0V to 0.6V when power fail detected. |
| 6 | SC | output | Sampling capacitor pin driven by receiver charge/discharge currents to create dynamic reference level 5.7V to 8.2V for input voltage detection. |
| 7 | TXI | output | Inverted data output from receiver; logic level output 0V to 1.5V (low) or VBAT-0.6V (high) complementary to TX pin. |
| 8 | TX | output | Non-inverted data output from receiver; logic level output 0V to 1.5V (low) or VBAT-0.6V (high) representing detected meter-bus modulation. |
| 9 | BAT | power_in | Logic supply reference input voltage 2.5V to 3.8V maximum (≤ VSTC - 1V) setting thresholds for TX, TXI, RX, and RXI digital signals. |
| 10 | VS | power_in | Switched supply output connecting either meter-bus or battery supply to slave microcontroller, controlled by STC voltage comparator, 1MΩ resistance when off. |
| 11 | VDD | power_out | Regulated 3.3V output voltage 3.1V to 3.4V typical powered by charged STC capacitor, supplies slave microcontroller and sensors. |
| 12 | RX | input | Non-inverted data input to transmitter; logic input -0.3V to 5.5V with threshold 0V to 0.8V (low) controls modulation current for meter-bus transmission. |
| 13 | RXI | input | Inverted data input to transmitter; logic input -0.3V to 5.5V with threshold 0.8V to 5.5V (high) alternative control of modulation current. |
| 14 | RIS | input | Modulation current adjustment input; external resistor 100Ω to 1kΩ programs modulation current IMC 11.5mA to 19.5mA with voltage reference 1.4V to 1.8V. |
| 15 | GND | power_in | Ground reference; common ground return for all circuits and voltage measurements throughout the device. |
| 16 | BUSL1 | bidirectional | Meter-Bus differential line for power and data communication, receives bus voltage 10.8V to 42V in receiver mode, polarity independent to BUSL2. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Interface |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
TSS721ADR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
tss721adr-etched.step/tss721adr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tss721adr.step/tss721adr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (13 pp, sha256
a530245d185adae6, retrieved 2026-09-18, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).