1.1 General Description

TC305K is a high-performance Controller for capacitive touch keys. Its engine is an 8-bit 80C51
compatible Processor.

TC305K has two timer/counters, maximum 8-channel of fine turned touch sensors, maximum 11
programmable /O pins, 4-channel 8-bit PWMs, 1 Watchdog timer, POR (Power-On Reset), I°C
and LVD (Low Voltage Detector) as peripherals. In addition, it contains an internal ring oscillator,
which can generate the 25 MHz system clock signal.

TC305K has its own architecture for fast sensing. With the hardware filter, it provides noise
immunity and excellent sensitivity. The firmware algorithm supports smart sensitivity and
compensates for changes in the sensitivity due to environmental factors such as temperature and
humidity.

To effectively manage power, TC305K enables low power consumption by using scan interval
and clock control methods after last touch.

TC305K operates over the extended -25°C to +85°C temperature range, and is available in the
16-pin QFN package.

1.2 Features

@ Capacitive touch key controller
= Supports up to 8 single-type fine turned touch keys
= Supports scroll bar-type touch keys
= Supports wheel-type touch keys
= Supports Grip Sensor

4 Response Time
= The latency of < 20ms for touch, subject to configuration
= Programmable sensing rate for power saving.
* cPU
= 8-bit Turbo 80C52 Architecture
=4 Cycles / 1 Machine Cycle
= Instruction Level Compatible with Intel 80C52
* Memory
= 16KB Flash
= 7688 Internal Aux. RAM
= 2568 Internal RAM
* Power Supply
= Operating Voltage : +1.75V to +3.60V
# Operating Frequency: Max. 25MHz
4 11 Programmable I/O Pins
# 4-channel 8-bit PWMs
¢ Communication interfaces
= 1-channel I2C Communication (Slave)
# Interal Ring OSC with Calibration function
® Supporting ISP/IAPIMDS
# 7 Internal Interrupt Sources and 3 External Interrupt Sources
# 3 Reset Sources
@ Power Down Wake-up Sources
= Reset Sources + 3 External Interrupt (Both Levels)
= Watchdog Timer Interrupt
® Power Consumption
=Active Current < Max. 1mA @+3.3V, 2MHz
= Sleep Current Typ. 150A @+3.3V(ST on)
= Deep Sleep Current: Typ. 3uA @+3.3V
# E.S.D. Protection up to
=8,000v
# Latch-up Protection Up to +200mA
Package
= 16-pin QFN (0.50T)

1.3 Applications
4 Home appliance: TV, Monitor, Home Theater
4 Mobile Phones
4 Portable MP3, MP4
@ Digital Cameras
4 Battery power applications