UM621A is a GNSS dual-frequency + MEMS integrated navigation module developed by Unicore Communications for the automotive market. Based on the proprietary multi-system dual-frequency high-performance SoC-UC6580A, and equipped with a 6-axis MEMS device, the module supports multi-system dual-frequency joint positioning or single- system standalone positioning, and can directly output GNSS+MEMS integrated positioning results, which ensures the continuity of positioning even in tunnels or underground parking lots.
Ordering Information
Supply at multiples of 500 pieces
Automotive grade dual-frequency GNSS+MEMS integrated navigation and positioning module
Supports GPS L1 C/A, L5; BDS B1I, B1C*, B2a; GLONASS G1; Galileo E1, E5a; NavIC L5*; QZSS and SBAS
Supports multi-system dual-frequency positioning, multi-system single-frequency positioning or single-system standalone positioning
Built-in MEMS to output integrated positioning results with a single module
Supports odometer pulse input
Supports the output of integrated positioning results and GNSS-only positioning results through one serial port
100% continuous navigation even in tunnels or underground parking lots
GNSS chip qualified according to AEC-Q100; production process conforms to IATF16949
| Channel | 96 channels, based on UFirebirdII |
| Frequency | GPS L1C/A, L5 |
| BDS B1I, B1C*, B2a | |
| GLONASS G1 | |
| Galileo E1, E5a | |
| NavIC L5* | |
| QZSS L1, L5 | |
| SBAS L1C/A | |
Positioning Mode | Single-System Standalone Positioning |
Multi-System Joint Positioning | |
| Time to First Fix (TTFF)1 | Cold Start: < 26 s |
| Hot Start: < 2 s | |
| Re-acquisition: < 2 s | |
| Positioning Accuracy (CEP)2 | Horizontal:1.5 m (Dual-frequency quad-system, open sky) |
| Positioning Error of INS only | < 2 % of the distance traveled without GNSS signals |
| Velocity Accuracy(RMS)3 | 0.05 m/s (GNSS) |
| 1PPS | 20ns |
| Sensitivity | GNSS |
| Tracking -162 dBm | |
| Cold Start -148 dBm | |
| Hot Start -158 dBm | |
| Reacquisition -160 dBm | |
| GNSS Data Update Rate | 1Hz / 5 Hz* / 10 Hz* |
| INS Data Update Rate | 50 / 100 Hz |
| Data Format | NMEA 0183, Unicore |
Dimensions | 16.0 x 12.2 x 2.4 mm |
Package | 24 pin SMD |
Temperature | Operating -40 °C ~ +85 °C |
Storage -40 °C ~ +85 °C |
| Voltage | 2.7V ~ 3.6 V DC |
| LNA | 2.7V ~ 3.3 V, <100 mA |
| Power Consumption3 | 330 mW |
| 2 × UART (LVTTL) | |
| 1 × I2C* | |
| 1 × SPI* | |
| 1 × SPEED | |
| 1 × FWD | |
| 1 × 1PPS (LVTTL) |
| Passive Antenna, Active Antenna |
| AGNSS* |
Note: Items marked with * are only supported by specific firmware.
1 Open sky
2 68% at 30 m/s for dynamic operation,open sky
3 Open sky, continuous tracking