GUIDE K35 Series Pin Definitions & Interfaces

Review the 24-pin LCC package assignments, signal directions, voltage levels, serial interfaces, timing output, RF input, antenna-power output, and dead-reckoning inputs required for GUIDE K35 Series carrier-board integration.

Pinout diagram

The diagram below shows the GUIDE K35 Series 24-pin LCC package from the top view. Confirm the package orientation before finalizing the PCB footprint and carrier-board layout.

Kalmix GUIDE K35 Series RTK GNSS module 24-pin LCC pinout diagram, top view
GUIDE K35 Series 24-pin LCC module pinout diagram, top view.

Interface summary

GUIDE exposes module-level interfaces for host communication, timing, antenna integration, power design, and optional dead-reckoning inputs.

Main host interface

UART0_TX and UART0_RX provide the primary serial interface for host communication and receiver configuration.

Additional serial buses

UART1 is multiplexed with I²C SDA and SCL. UART2 provides an additional transmit and receive pair for system-level integration.

Timing and control

PPS, CHIP_EN, RTC_EINT, EINT_IN, and EINT_OUT support timing output, reset, wake-up, and host-control workflows.

RF and DR inputs

RF_IN and ANT_POWER support external GNSS antenna integration. SPEED and FWD are used by K35E dead-reckoning workflows.

Pin descriptions

Use the following assignments when designing the carrier board. Leave unused NC pins unconnected. Verify the interface level of each signal before completing the schematic and PCB layout.

Pin Name I/O Description Voltage / level
1 RTC_EINT I External interrupt input. Hold high for > 10 ms to exit RTC mode. Leave unconnected if unused. 3.3 V
2 NC — Leave unconnected. —
3 PPS O Timepulse output. Provides a 1 PPS timing signal. 2.8 V
4 SPEED I Wheel-speed pulse input for dead-reckoning workflows. Leave unconnected if unused. 2.8 V
5 NC — Leave unconnected. —
6 NC — Leave unconnected. —
7 EINT_IN I External interrupt input for sleep-mode wake-up. 1.8 V
8 CHIP_EN I Module enable and reset control. Active low. 3.3 V
9 ANT_POWER O Active-antenna power-supply output. 3.3 V
10 GND G Ground. GND
11 RF_IN I GNSS antenna signal input. Use a 50 Ω RF path. —
12 GND G Ground. GND
13 GND G Ground. GND
14 EINT_OUT O External host-enable output. 1.8 V
15 FWD I Forward / backward direction input for dead-reckoning workflows. Leave unconnected if unused. 2.8 V
16 UART2_TX O UART2 transmit output. 2.8 V
17 UART2_RX I UART2 receive input. 2.8 V
18 TXD1 / SDA O / I/O UART1 transmit output, multiplexed with I²C serial data (SDA). 2.8 V
19 RXD1 / SCL I UART1 receive input, multiplexed with I²C serial clock (SCL). 2.8 V
20 UART0_TX O UART0 transmit output. Primary serial port. 2.8 V
21 UART0_RX I UART0 receive input. Primary serial port. 2.8 V
22 V_BCKP P Backup-battery supply input. 2.2–3.6 V
23 VCC P Main power-supply input. 3.0–3.6 V
24 GND G Ground. GND
I Input O Output I/O Bidirectional interface P Power supply G Ground — Not connected

Continue with the documentation

Continue with the module specifications, package-layout references, or receiver-level protocol documentation.

Specifications Review GNSS performance, power consumption, electrical limits, and environmental parameters. Mechanical & Dimensions Review package dimensions, recommended footprint, and surface-mount assembly references. Protocol Review NMEA output, RTCM correction input, and PAIR configuration commands.
Product evaluation

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Review the product page or discuss a module-level integration requirement with the Kalmix team.

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