MC9RS08KB4CSG

Overview

The MC9RS08KB4CSG is an 8-bit microcontroller from the RS08KA family, designed for low-cost applications. It features a HC9RS08 CPU core operating at up to 20 MHz bus frequency. The device includes 4 KB of FLASH memory and 256 bytes of RAM. Key peripherals consist of a 10-bit ADC with 8 channels, two Timer/PWM modules (TPM), and a Serial Communication Interface (SCI). It operates within a voltage range of 2.3 V to 5.5 V and supports temperatures from -40 °C to 125 °C.

Feature Summary

• Supports software sigma-delta analog-to-digital conversion for PIR sensing
• Includes configurable pull-up devices and hysteresis on input pins
• Features breakpoint capability for in-circuit debugging

Applications

• Passive infrared motion detectors
• Low-cost digital appliance switching
• Lighting control systems

Procurement Notes

Verify the specific suffix 'CSG' against official NXP documentation to confirm package type and temperature grade. Ensure the component matches the RS08KA family specifications rather than generic S08 series data. Cross-reference the datasheet revision date to confirm current manufacturing status and pinout compatibility.

Selection Notes

Select this MCU for cost-sensitive designs requiring basic analog sensing capabilities without external ADCs. The integrated sigma-delta conversion support simplifies PIR sensor interfaces. Consider the limited peripheral count and memory size when evaluating complex application requirements compared to higher-end S08 variants.

Part Context

This component belongs to the RS08KA family, optimized for ultra-low-cost implementations. It shares architectural similarities with the broader S08 family but focuses on reducing bill-of-materials costs for simple control tasks. The design emphasizes efficient use of internal resources for signal processing tasks like motion detection.

FAQ

How does the MC9RS08KB4CSG handle analog signals from PIR sensors?

It utilizes a software sigma-delta analog-to-digital conversion method implemented via its timer and GPIO peripherals, eliminating the need for dedicated external ADC hardware.

What is the maximum operating frequency of the CPU core?

The HCS08 CPU core supports a maximum bus frequency of 20 MHz.