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OBS421 series

Stand-alone dual-mode Bluetooth modules

OBS421 series is an older generation product. For new designs see:
NINA-B1 series modules
Stand-alone Bluetooth low energy modules with NFC
NINA-B221 + B222
Stand-alone dual-mode Bluetooth modules

Proven dual‑mode Bluetooth modules with best performance and multi‑point functionality

  • Bluetooth v4.0 with Bluetooth low energy and Bluetooth BR/EDR (dual‑mode Bluetooth)
  • Embedded stack (SPP, DUN, PAN, GATT)
  • Low Emission Mode® limits interference with other 2.4GHz RF
  • u‑blox Low Energy Serial Port Service
  • High throughput of 1.3 Mbps
  • Advanced multipoint capability with 7 slaves

Product variants

CB-OBS421i-24

Internal antenna

CB-OBS421x-24

U.FL antenna connector

Product variantsCB-OBS421i-24CB-OBS421x-24
Antenna 
Internal antenna-
Connector (active) for external antenna-
Area 
Global
Bluetooth profiles and services 
Bluetooth SPP
Bluetooth DUN
Bluetooth PAN
Bluetooth GATT
u-blox low energy serial port service
Microprocessor on board  
Standalone module
Interfaces 
UART1
GPIO9
Electrical data 
Minimum supply [V]3.00
Maximum supply [V]6.0
Environmental data, quality & reliability 
Maximum temperature [°C]85
Minimum temperature [°C]-30
Size [mm]16 x 36 x 2.6
Features 
AT command support
Bluetooth with enhanced data rate
Extended Data Mode protocol
Factory programmed MAC address(es)
Low emission mode
Other 
MarketsIndustry, Smart Cities, Healthcare, Retail, Smart Home & Buildings

Product Summary

OBS421 Product Summary

05-Jun-2018

188 KB

Data Sheet

Electrical Mechanical Data Sheet for OBS421

04-Nov-2016

2.74 MB

Getting Started

Bluetooth Serial Port Adapter Getting Started for OBS418, OBS419, and OBS421
410 KB
Bluetooth Serial Port Adapter Toolbox Getting Started for OBS418, OBS419, and OBS421
458 KB
OBS421 & OLS425 Bluetooth Low Energy SPA Getting Started
294 KB

Interface Manual

Bluetooth Serial Port Adapter AT Commands GATT for OBS421
48 KB
Bluetooth Serial Port Adapter AT Commands for OBS421, OBS418, OBS419 and OLS425
320 KB

Application Note

OBS418, OBS419, OBS421 series Solder down instructions

09-Feb-2017

1.01 MB
Bluetooth Serial Port Adapter Security Application Note for OBS418, OBS419, and OBS421
93 KB
OBS421 as a GATT Bluetooth Classic to Bluetooth Low Energy Gateway
122 KB
Bluetooth Low Energy (BLE) GATT Examples with OBS421 & OLP425
69 KB

Driver

Setup Toolbox (cB-2138-20) zip
509 KB

Information Note

Completed RED certification for Short Range Radio products

16-Jun-2017

196 KB
Label modification to comply with RED requirements

30-May-2017

123 KB
Updated ETSI regulations certifications

30-Nov-2016

162 KB
IN: OBS421-01B
116 KB
IN: OBS421i-24, OBS421x-24
113 KB
IN: OBS421i-i4, OBS421x-i4
113 KB

Conformity Declaration

OBS421 Declaration of Conformity (RED)

06-Jun-2017

97 KB

Firmware Update

cB-2254-12, FW_v5.3.2 for OBS421
267 KB

Overview

u-blox Package Information Guide

21-Aug-2018

2.55 MB

White Paper

Use case possibilities with Bluetooth low energy in IoT applications
637 KB
Short range low power wireless devices and Internet of Things (IoT)
688 KB