BS85B12-3 HOLTEK [Holtek Semiconductor Inc], BS85B12-3 Datasheet - Page 8

• Manufacturer Part Number: BS85B12-3
• Description: Touch Key Flash Type 8-Bit MCU with LCD/LED Driver
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

General Description
Selection Table
Block Diagram
Rev. 1.00
BS85B12-3
BS85C20-3
Part No.
Internal
12MHz
16MHz
12MHz
16MHz
Clock
8MHz
8MHz
These devices are a series of Flash Memory type 8-bit high performance RISC architecture
microcontrollers with fully integrated touch key functions and LCD/LED drivers. With all touch key
functions provided internally and with the convenience of Flash Memory multi-programming
features, this device range has all the features to offer designers a reliable and easy means of
implementing Touch Keys within their products applications. The touch key functions are fully
integrated completely eliminating the need for external components. The inclusion of both LCD and
LED driver functions allows for easy and cost effective solutions in applications that require to
interface to these display types.
In addition to the flash program memory, other memory includes an area of RAM Data Memory as
well as an area of EEPROM memory for storage of non-volatile data such as serial numbers,
calibration data etc. Protective features such as an internal Watchdog Timer, Low Voltage Reset and
Low Voltage Detector functions coupled with excellent noise immunity and ESD protection ensure
that reliable operation is maintained in hostile electrical environments.
All devices include fully integrated low and high speed oscillators which require no external
components for their implementation. The ability to operate and switch dynamically between a range
of operating modes using different clock sources gives users the ability to optimise microcontroller
operation and minimise power consumption. Easy communication with the outside world is provided
using the internal I
Timer Modules and many other features further enhance device functionality and flexibility.
These touch key devices will find excellent use in a huge range of modern Touch Key product applications
such as instrumentation, household appliances, electronically controlled tools to name but a few.
V
V
VDD
5.5V
5.5V
LVR
LVR
~
~
System
8MHz~
16MHz
8MHz~
16MHz
Clock
Touch Key Flash MCU with LCD/LED Driver
Program
Memory
2K 15
4K 15
2
C and SPI interfaces, while the inclusion of flexible I/O programming features,
Memory
256 8
384 8
Data
EEPROM
128 8
Data
64 8
2
I/O
22
38
Module
Timer
2
3
BS85B12-3/BS85C20-3
Touch
Key
12
20
Driver
4 14
4 22
LCD
Driver
8 14
LED
6 8
SPI/
I
2
1
1
C
Stack
4
8
February 1, 2011
24/28SKDIP/SOP
28SSOP, 44QFP
28SKDIP/SOP
24/28SSOP
Package