Overview

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The BK1661 is a fully integrated single-chip L1 GNSS solution designed for applications that require low power and high

performance. The BK1661 significantly improves the actual positioning and TTFF performance by optimizing multi-mode

signal tracking, advanced anti-multipath techniques and anti-interference RF front.

The BK1661 uses an advanced firmware and hardware low power design. It delivers ultra-low power consumption without

compromising performance.

The BK1661 The device powered with 1.8V enables the on-chip voltage regulators to internally supply the RF front-end,

core logic and the backup logic. I/O pins are compatible with 1.8V, 2.5V and 3.3V.

Features

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GNSS

- 120 tracking channels with fast search engine

- Supports GPS L1, Beidou B1, Galileo E1, QZSS L1, GLONASS G1

- Cold acquisition sensitivity: -148 dBm

- Hot acquisition sensitivity: -159 dBm

- Re-acquisition sensitivity: -159 dBm

- Tracking sensitivity: -163 dBm

- Update rate: 1 ~ 20 Hz (BK1661S support 1Hz only)

- Horizontal position accuracy: 1.5 m CEP

- Ground speed accuracy: 0.1 m/s CEP

- Cold TTFF: 28 s

- AGPS TTFF: 1.5 s

- Hot TTFF: 1.0 s

- Supports SBAS

- Supports AGPS

- Supports batch data report mode

- Supports NMEA0183

Core and Memory

- 32-bit DSP at up to 350 MHz

- Single and double floating point support

- Embedded Flash

- RAM/ROM

- 32 KB Cache

- 256-bit eFuse

- UART/JTAG for downloading and debugging

Clock Management

- External oscillator: 26 MHz TCXO

- Internal oscillator: 26 MHz crystal oscillator (X26M), 32 kHz crystal oscillator (X32K) and ring oscillator (ROSC32K)

- 350 MHz PLL

Power Management

- 1.8 to 3.6 V VBAT supply

- On-chip power-on reset (POR) and brown-out detector (BOD)

- Embedded LDO regulators

- Embedded DC-DC converter

- Low power consumption:

- Continuous L1 mode: 12 mA

- Sleep mode: 14 μA

Peripherals

- 17 GPIOs

- 3x UART, 1 with Flash download support

- 1x I2C

- 1x SPI

- 10-bit SAR ADC, 1 channel

- 1x Watchdog

- 2x general-purpose 32-bit timer/counter

- 1x low power RTC timer

- 1x temperature sensor

Packaging

- QFN32 package, 4 mm x 4 mm

- Operating temperature range: -40 to +85°C