SK5210 USB and HID over I2C Keyboard Encoder IC |Sprintek

Overview

The SK5210 is a low power USB and I2C dual interface keyboard encoder with 1 PWM backlight and 7 LEDs control. While the USB interface is connected to the main PC as normal keyboard, the secondary I2C interface can be used to communicate with a system embedded controller (EC) for EC to receive all user events and get full control of the system. It’s the best choice for customized keyboard design for tablet / PC / laptop / docking station / Instrument.

The SK5210 scans and encodes an 8-row by 20-column matrix. The key press events are translated to keyboard report. The encoder gets matrix information from on-chip matrix tables.

The backlight LED PWM brightness control and 7 LEDs can be controlled via the dual interfaces by commands or key press events.

The SK5210 provides an external PS/2 port that supports hot plug and hot swap of PS/2 devices such as touchpad, pointing stick, mouse including wheel mice, and keyboard. The host can send commands via SK5210 PS/2 command relay feature to the external PS/2 device to change default settings.

Features

Full speed USB 2.0 HID and HID over I2C 1.0 dual interfaces with Bootloader for field upgrade
One external PS/2 interface to PS/2 device such as mouse, touchpad, pointing stick, and keyboard
7 LEDs (4 shared with column scan pins)
1 PWM backlight brightness control
FN key support
8 x 20 matrix keyboard scan
User-Programmable keyboard matrix
4 Matrix Tables for LFn, RFn cases, NumLock On/Off cases
Support macro keys to generate like international characters “€, ¥, ♫”, “Ctrl+Alt+Del”, or “Coke Cola”, “000” sequential string outputs
USB and I2C can have different scan code reports for the same key event
PS/2 command relay support
Advanced ghost key detection algorithm to maximize the key combination without additional diodes
HID over I2C interface supports commands: RESET GET_REPORT SET_REPORT SET_POWER
Built-in oscillator and digital circuit. No external crystal is needed
LQFP 48 pin package: 7x7mm 1.6 Max (LxWxH)
Low power consumption: 0.3uA (no key pressed under I2C only), 240uA (under USB suspend)
Operation voltage range: 3.0 to 5.5V
Industrial temperature range: -40°C to +85°C
Custom versions available in small and large quantities