# 12–16 V Digital Sense Interface

## Description

Low\-quiescent\-current interface that converts a 12–16 V battery signal into a protected 5 V digital input using a common ground and a Molex 22\-05\-2061 input connector\.

## Project Details

- **Owner:** henda79
- **Created:** 9/3/2026
- **Last Updated:** 9/3/2026
- **Visibility:** Public

## Key Components

### J1 — [22052061](https://flux.ai/lcsc/22052061~xlvk.md)

- Role: Input Connector
- Manufacturer Name: MOLEX
- Part Type: Pin Headers
- Functional Group: Battery Signal Input
- Datasheet URL: https://assets\.lcsc\.com/datasheet/szlcsc/Download\-ISO9001\-Certification\.pdf
- Package or Case Code: HDR\-TH\_6P\-P2\.54\-H\-M\-W9\.5
- LCSC Part Number: C586989
- Product Info Url: https://lcsc\.com/product\-detail/Pre\-ordered\-Products\_MOLEX\_22052061\_MOLEX\-22052061\_C586989\.html
- Role Details: 12–16 V battery sense input on pin 1, common ground on pin 2; pins 3–6 intentionally unused
- JLCPCB Part Class: Extended Part
- Manufacturer Part Number: 22052061

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J2 — [Pin Header 01x03 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md)

- Role Details: Pin 1 \+5V input, pin 2 MCU\_SENSE\_N, pin 3 GND
- Functional Group: MCU Interface
- Part Type: Connector
- Role: Output Connector
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- Pin\_1 [pin 1]
- Pin\_2 [pin 2]
- Pin\_3 [pin 3]

### Q1 — [2N3904TA](https://flux.ai/lcsc/2n3904ta~z5rj.md)

- Product Info Url: https://lcsc\.com/product\-detail/Transistors\-NPN\-PNP\_ON\-Semicon\_2N3904TA\_ON\-Semicon\-ON\-2N3904TA\_C258184\.html
- Role Details: 40 V through\-hole common\-emitter inverter; TO\-92 pin 1 emitter, pin 2 base, pin 3 collector
- LCSC Part Number: C258184
- Role: Logic\-level Shifting
- JLCPCB Part Class: Extended Part
- Manufacturer Part Number: 2N3904TA
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2109100930\_onsemi\-2N3904TA\_C258184\.pdf
- Manufacturer Name: onsemi\(安森美\)
- Part Type: Bipolar Transistors \- BJT
- Functional Group: NPN Level Shifter
- Package or Case Code: TO\-92\-3\_L4\.9\-W3\.7\-P2\.54\-L

**Pins:**
- B [pin 2]
- C [pin 3]
- E [pin 1]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/henda79/12\-16\-v\-digital\-sense\-interface\~4a](https://flux.ai/henda79/12-16-v-digital-sense-interface~4a).*

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*Generated from [https://flux\.ai/henda79/12\-16\-v\-digital\-sense\-interface\~4a](https://flux.ai/henda79/12-16-v-digital-sense-interface~4a)*