BS2824 Holtek Semiconductor Inc., BS2824 Datasheet - Page 2

• Manufacturer Part Number: BS2824
• Description: Touch Key Mcu
• Manufacturer: Holtek Semiconductor Inc.

BS2824/BS2854/BS2868
Touch Key MCU
General Description
Selection Table
Block Diagram
Rev. 1.00
BS2824
BS2854
BS2868
Part No.
Program
Memory
2K 15
2K 15
4K 15
The BS2824/BS2854/BS2868 are a series of 8-bit high performance, RISC architecture touch key
microcontrollers specifically designed for a wide range of touch key applications. The usual Holtek
microcontroller features of low power consumption, I/O flexibility, timer functions, oscillator
options, power down and wake-up functions, watchdog timer and low voltage reset, combine to
provide devices with a huge range of functional options while still maintaining a high level of cost
effectiveness. The fully integrated system oscillator HIRC, which requires no external components
and which has three frequency selections, opens up a huge range of new application possibilities for
these devices.
The special features of the BS2824/BS2854/BS2868 devices lie in their touch key functions which
can detect human body contact using external touch pads. The high level of device integration
enable full touch key applications to be implemented with a minimum number of external
components. The devices are equipped with a One-line serial interface to allow easy communication
for device setup and for touch pin monitoring and setup purposes.
Special internal circuitry is also employed to ensure excellent power noise rejection to reduce the
possibility of false detections, increasing the touch switch application reliability under adverse
environmental conditions. With auto-calibration, low standby current and a choice of wake-up
features, this touch key MCU device range provides a simple, reliable and highly cost-effective
means of implementing touch switches in a wide variety of user applications.
The following block diagram illustrates the main functional blocks.
Memory
224 8
Data
96 8
96 8
I/O
20
31
8
Timer
8-bit
2
1
2
Base
Time
1
1
1
Internal
(MHz)
4/8/12
4/8/12
4/8/12
Osc.
2
(LXT)
RTC
SCOM
LCD
4
4
8-bit 2
PWM
PFD
Touch
Keys
4
4
8
January 27, 2010
Stack
6
4
6
24/28SOP
Package
16NSOP
44QFP