Safety-Critical Features

Summary

Engineers are commonly are faced with the challenge of

complying with safety standards or the need to add a fail-safe

operation in their design, while keeping cost and complexity

to a minimum. Additionally, Microchip offers a family of 8-bit

MCUs which integrates fault-detecting hardware features to

assist you in developing your safety-critical applications. This

high level of integration makes these MCUs suitable for many

applications like home appliances, industrial machinery, RPM

indicators and power supplies.

The Window Watchdog Timer (WWDT), Cyclic Redundancy

Check with Memory Scan (CRC/SCAN) and Hardware Limit

Timer (HLT) help ease implementation of safety standards

or fail-safe features. In addition, the higher-memory products

include additional peripherals to support control and power

management applications. By eliminating code overhead

and external components, these features help reduce

design complexity and save costs, while also enabling faster

time-to-market.

Highlights

(CRC/SCAN): Automatically calculates CRC checksum

of Program/DataEE memory for non-volatile memory

integrity. Additionally provides a general purpose 16-bit

CRC for use with memory and communications data.

Monitoring is done in hardware with no interruption to

the CPU, reducing overall code.

supervisory circuit that generates a reset when

software timing anomalies are detected within a

configurable critical window. Gives engineers the

flexibility and ease to add monitoring to design.

high-resolution measurements of any digital signal

in hardware, resulting in more precise and accurate

measurements. This can be used as a standard timer,

ideal for speed control, range finding and RPM indicators.

timer/counter with hardware monitoring capabilities

for missed periodic events and fault detection of

external hardware.

AC signals at the lowest crossing. Simplifies TRIAC

and switching control, eliminating the need for

additional components.

non-overlapping complementary waveforms for various

inputs including Comparators and PWM, while offering

enhanced features like deadband control, auto

shutdown, auto reset, phase control, blanking control.

PWM which can be utilized to implement a variety of

motor control and lighting applications.

Development Tools

PICkit Low Pin Count Development Board

(DM164130-9)

8-bit PIC MCU

and ships with PIC18F14K22-I/P

(20-pin) MCU

prototyping circuits and bare board as well

new technologies

Featured 8-bit MCUs with Safety-Critical Features

Device

PIC12(L)F1612

3.5

256

6

4/1

1

4

1

2/0

1

0

2/1

0

ü

ü

0

–

0

0

PIC16(L)F1613

3.5

256

12

4/1

2

8

1

2/0

1

0

2/1

0

ü

ü

0

–

0

0

www.microchip.com/8-bit