SK5340 / SK5341 - User-Programmable HID-over-I2C Multimedia Keyboard Encoders with 8x20 Scan, PWM Backlight, Key Lock, External PS/2 and Secure Upgradable Bootloader
SK5340-LT / SK5341-LT
48-pin QFN, 0.4 mm pitch, 6 x 6 x 0.75 mm
SK5340-LP / SK5341-LP
48-pin LQFP, 0.5 mm pitch, 7 x 7 x 1.6 mm
Overview
The SK5340 and SK5341 are user-programmable HID-over-I2C keyboard encoder ASICs with an 8-row by 20-column matrix, one PWM backlight brightness output, a BLEN backlight enable output, and five keyboard lock-status LEDs. They support multimedia, user-defined function, macro, Fn, FnLock, NumLock-impacted and KeyLock keys.
SK5341 adds a hot-pluggable external PS/2 port for a standard 3-button, wheel or 5-button mouse. SK5340 provides the core HID-over-I2C keyboard interface without the external PS/2 mouse port.
Each device connects directly to a host I2C bus or works with an FTDI FT260 HID-over-I2C-to-USB bridge. The field-upgradable bootloader provides version anti-rollback and LMS post-quantum firmware signature authentication to support EU Cyber Resilience Act requirements.
All four package and model options share the same 48-pin assignment. Matrix settings, signed releases, firmware programming, model upgrades 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
- Hot-pluggable external PS/2 port for 3-button, wheel or 5-button mice (SK5341)
- 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 | Host Interface | External Port | Package | Body Size (L x W x H) |
|---|---|---|---|---|
| SK5340-LT | HID-over-I2C | None | 48-pin QFN, 0.4 mm pitch | 6 x 6 x 0.75 mm |
| SK5340-LP | HID-over-I2C | None | 48-pin LQFP, 0.5 mm pitch | 7 x 7 x 1.6 mm |
| SK5341-LT | HID-over-I2C | PS/2 mouse | 48-pin QFN, 0.4 mm pitch | 6 x 6 x 0.75 mm |
| SK5341-LP | HID-over-I2C | PS/2 mouse | 48-pin LQFP, 0.5 mm pitch | 7 x 7 x 1.6 mm |
Order SK5340-LT for SK5341-LT, and SK5340-LP for SK5341-LP. Upgrade the device to SK5341 during production with the FlexSuite toolset.
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, securely upgrade firmware and configure SK5340 devices as SK5341.
FlexTester
Verify key events and the completed keyboard design.