This smart bicycle tail light and alarm system enables the user to select different blinking patterns for different riding situations such as stops, braking and emergency situations. Users can also trigger a horn as an alarm system and theft deterrent. A Bluetooth® Low Energy (LE) system-on-chip (SoC) is used as a central control unit, reading data from a connected accelerometer and controlling the connected LEDs and horn. To maximize the horn's sound pressure, it is driven by an H-bridge equipped, I2C controlled high-voltage GreenPAK™ (HVPAK™) programmable mixed-signal matrix, supplied from the reverse boost voltage of the charger PMIC. Additionally, different LED configurations can be selected, taking advantage of the Bluetooth LE SoC's integrated ADC and the PMIC's adjustable boost output voltage in combination with the HVPAK's second H-bridge to control e.g., two different LED colors without any additional discrete switches.

System Benefits​:

  • Ultra-compact design comprised of a Bluetooth LE SoC, switching charger with reverse boost and I2C controlled 2x H-bridge power control and driver device
  • Situation-aware LED light control (brightness, color, blink pattern)
  • Improved horn sound pressure through full-bridge driver
  • Automatic alarm/theft deterrent function using a Bluetooth LE received signal strength indicator (RSSI)




  • Ebikes, bicycles, scooters

Winning Combinations Interactive Diagram

Select a block to discover products for your design

4:3 ratio Sheet.1 Sheet.2 Sheet.3 Sheet.4 US247 US247 US247 Antenna Sheet.10 Sheet.11 Sheet.12 Sheet.13 Sheet.14 Inductor Coreless (Air conductor) Sheet.16 Sheet.17 Sheet.18 Sheet.19 Sheet.20 Sheet.21 Sheet.22 Sheet.23 Sheet.24 Non-Electric Cap Sheet.26 Sheet.27 Sheet.28 Sheet.29 Sheet.30 Non-Electric Cap.31 Sheet.32 Sheet.33 Sheet.34 Sheet.35 Sheet.36 Ground (earth) Sheet.38 Sheet.39 Sheet.40 Sheet.41 Sheet.42 Sheet.43 Sheet.44 Sheet.45 Sheet.46 Sheet.47 Sheet.48 USB-C Label Text 10pt.768 Sheet.51 Sheet.52 Sheet.53 Sheet.54 Sheet.55 Sheet.56 Sheet.57 Sheet.58 Sheet.59 Sheet.60 Sheet.61 Sheet.62 Sheet.63 Ground (earth).73 Sheet.74 Sheet.75 Sheet.76 Sheet.77 Sheet.78 Shunt.244 Sheet.80 Sheet.81 Sheet.82 Sheet.83 Sheet.84 Sheet.85 Sheet.86 Label Text 10pt.254 + + Label Text 10pt.255 - - Battery Li-ion Sheet.95 Sheet.96 Label Text 10pt.70 LI-ION LI-ION Sheet.98 Sheet.99 Sheet.100 Darlington.131 Sheet.102 Sheet.103 Darlington.254 Sheet.105 Sheet.106 Darlington.254 Inductor Coreless (Air conductor).120 Sheet.121 Sheet.122 Sheet.123 Sheet.124 Sheet.125 Sheet.126 Sheet.127 Sheet.128 Sheet.129 Non-Electric Cap.130 Sheet.131 Sheet.132 Sheet.133 Sheet.134 Sheet.135 Ground (earth).136 Sheet.137 Sheet.138 Sheet.139 Sheet.140 Non-Electric Cap.141 Sheet.142 Sheet.143 Sheet.144 Sheet.145 Sheet.146 Ground (earth).147 Sheet.148 Sheet.149 Sheet.150 Sheet.151 Sheet.210 Sheet.202 Sheet.203 Sheet.204 Sheet.205 Sheet.206 Negative Power Rail.207 Line.758 Line.759 Ground (earth).211 Sheet.212 Sheet.213 Sheet.214 Sheet.215 Non-Electric Cap.216 Sheet.217 Sheet.218 Sheet.219 Sheet.220 Sheet.221 Ground (earth).222 Sheet.223 Sheet.224 Sheet.225 Sheet.226 Sheet.247 Sheet.238 Transformer.324 Line.841 Line.842 Sheet.242 Inductor.300 Sheet.244 Sheet.245 Sheet.246 Sheet.248 Sheet.249 Sheet.250 Darlington.131 Sheet.252 Sheet.253 Darlington.254 Sheet.255 Sheet.256 Darlington.254 Sheet.258 Sheet.259 Sheet.260 Darlington.131 Sheet.262 Sheet.263 Darlington.254 Sheet.265 Sheet.266 Darlington.254 Shunt.268 Sheet.269 Sheet.270 Sheet.271 1Mbit SPI Flash Memory 1Mbit SPI Flash Memory 1MbitSPI Flash Memory Accelerometer Accelerometer Accelerometer Sheet.302 Sheet.303 Sheet.304 Sheet.305 Sheet.306 Sheet.307 Sheet.308 Sheet.309 Sheet.310 Sheet.311 Sheet.312 Sheet.313 Sheet.314 VBAT VBAT VBAT Sheet.316 Sheet.317 Sheet.318 Sheet.319 Sheet.320 VMID 4.4-5.5V VMID 4.4-5.5V VMID4.4-5.5V Sheet.322 Sheet.323 Sheet.324 Sheet.325 Sheet.326 Sheet.328 Sheet.329 Sheet.330 VDD -3V VDD -3V VDD -3V I2C nINT I2C I2C Sheet.334 Sheet.335 Sheet.338 VDD – 3V VDD-3V VDD-3V Sheet.346 VMID 4.4-5.5V VMID 4.4-5.5V VMID4.4-5.5V Sheet.367 Shunt Sheet.228 Sheet.229 Sheet.230 Ground (earth).231 Sheet.232 Sheet.233 Sheet.234 Sheet.235 LEDs LEDs LEDs Sheet.369 Sheet.370 Sheet.371 Sheet.372 Sheet.373 Sheet.374 Sheet.375 Sheet.376 Sheet.377 Sheet.378 Sheet.379 Sheet.380 Sheet.381 Sheet.382 Sheet.383 Sheet.384 Sheet.385 Sheet.386 Sheet.387 Sheet.388 Sheet.389 Sheet.390 Connector 1 Connector 1.392 Connector 1.393 Sheet.394 Sheet.395 Sheet.396 VMID 4.405.5V VMID 4.405.5V VMID 4.405.5V LEDs LEDs LEDs I-LED/sns I-LED_sns I-LED_sns LED/EN LED_EN LED_EN Sheet.402 Sheet.403 Sheet.404 Sheet.405 Sheet.406 Sheet.407 Sheet.418 Shunt.358 Sheet.359 Sheet.360 Sheet.361 Ground (earth).362 Sheet.363 Sheet.364 Sheet.365 Sheet.366 Sheet.419 Shunt.349 Sheet.350 Sheet.351 Sheet.352 Ground (earth).353 Sheet.354 Sheet.355 Sheet.356 Sheet.357 Sheet.438 Sheet.408 Sheet.409 Sheet.410 Darlington.131 Sheet.412 Sheet.413 Darlington.254 Sheet.415 Sheet.416 Darlington.254 Sheet.420 Sheet.421 Sheet.422 Darlington.131 Sheet.424 Sheet.425 Darlington.254 Sheet.427 Sheet.428 Darlington.254 Sheet.430 Sheet.431 Sheet.432 Connector 1.433 Sheet.434 Connector 1.435 Sheet.436 Sheet.437 Sheet.439 Alarm/Horn Alarm/Horn Alarm/Horn Tail Light LEDs Tail Light LEDs Tail Light LEDs Connector 1.443 Connector 1.444 Switching Charger Reverse Boost Switching Charger Reverse Boost Switching Charger Reverse Boost Switching Charger Reverse Boost VBUS VBUS VBUS VBAT VBAT VBAT TMP/SNS TMP_SNS TMP_SNS VMID VMID VMID CHG/LX VSYS CHG_LX VSYS CHG_LX VSYS Wakeup Wakeup Wakeup I2C I2C I2C LDO LDO LDO Buck-Charger Reverse Boot Buck-Charger Reverse Boot Buck-Charger Reverse Boot I2C nINT.447 nINT nINT Ground (earth).448 Sheet.449 Sheet.450 Sheet.451 Sheet.452 Sheet.590 Sheet.397 Sheet.577 Sheet.559 Sheet.278 Sheet.283 Sheet.285 Sheet.569 Sheet.287 Sheet.277 Sheet.279 Sheet.280 Sheet.454 Sheet.455 Bluetooth Low Energy Bluetooth Low Energy SoC Bluetooth Low Energy SoC Bluetooth Low Energy SoC I2C I2C I2C ARM MO+ Arm MO+ Arm MO+ SPI SPI SPI nINT nINT nINT ADC ADC ADC GPIOs GPIOs GPIOs H-Bridge H-Bridge Driver & Control HVPAK 2x H-BridgeDriver &ControlHVPAK 2x I2C I2C I2C Control CLK OCP Control CLK OCP Control CLK OCP I-SNS I-SNS I-SNS H-Bridge H-Bridge H-Bridge H-Bridge H-Bridge H-Bridge
Exiting Interactive Block Diagram