SK5340 - User-Programmable HID-over-I2C Multimedia Keyboard Encoder with 8x20 Scan, PWM Backlight, Key Lock and Secure Upgradable Bootloader
SK5340-LT
48-pin QFN, 0.4 mm pitch, 6 x 6 x 0.75 mm
SK5340-LP
48-pin LQFP, 0.5 mm pitch, 7 x 7 x 1.6 mm
Overview
The SK5340 is a user-programmable HID-over-I2C keyboard encoder ASIC with an 8-row by 20-column matrix, one PWM backlight brightness output, a BLEN backlight enable output, and five keyboard lock-status LEDs. It supports multimedia, user-defined function, macro, Fn, FnLock, NumLock-impacted and KeyLock keys.
It connects directly to a host I2C bus or works with an FTDI FT260 HID-over-I2C-to-USB bridge. Its field-upgradable bootloader provides version anti-rollback and LMS post-quantum firmware signature authentication to support EU Cyber Resilience Act requirements.
SK5340-LT and SK5340-LP provide the same functions and 48-pin assignment in QFN and LQFP package options. Matrix settings, signed releases, firmware programming and design testing are supported by Sprintek FlexSuite tools.
Features
- Microsoft HID-over-I2C device-side protocol interface
- Optional FTDI FT260 HID-over-I2C-to-USB bridge support
- Field-upgradable bootloader with anti-rollback and LMS post-quantum firmware authentication
- EU Cyber Resilience Act ready firmware-update design
- 8 x 20 keyboard scan for up to 160 keys
- 1 programmable 8-bit PWM backlight output and BLEN backlight enable
- 5 keyboard lock-status LEDs and up to 16 generic LED drive pins
- Fn, FnLock, NumLock-impacted, KeyLock, multimedia, function and macro key support
- Advanced ghost-key detection
- Built-in oscillator; no external crystal required
- 5.9 mA typical operating current; 540 µA typical suspend current
- 3.0 to 5.5 V operating voltage
- Industrial temperature range: -40°C to +85°C
- Pb-free and RoHS-compliant QFN48 and LQFP48 packages
Package and Ordering Information
| Part Number | Package | Pitch | Body Size (L x W x H) |
|---|---|---|---|
| SK5340-LT | 48-pin QFN | 0.4 mm | 6 x 6 x 0.75 mm |
| SK5340-LP | 48-pin LQFP | 0.5 mm | 7 x 7 x 1.6 mm |
Support Software
Download the Sprintek keyboard design tools.
FlexEditor
Edit the keyboard matrix, scan-code mapping, macro keys and feature settings.
FlexSign
Sign released matrix files to protect the approved configuration.
FlexProgrammer
Program matrix settings and securely upgrade SK5340 firmware.
FlexTester
Verify key events and the completed keyboard design.