Maxim 公司的MAXQ7665A- MAXQ7665D 是基于MCU的智能系统级芯片(SoC)数据采集系统. MAXQ7665A- MAXQ7665D集成了高性能16位RISC核,带PGA的12位500ksps SAR ADC,支持数据速率高达1Mbps的CAN 2.0控制器．此外还集成了测量芯片温度的温度传感器和遥控温度传感器驱动器，多达128KB闪存和512B RAM以及多种外设接口．这些器件主要用在汽车转向传感器，基于CAN 和LIN的汽车传感器以及工业控制．本文介绍了MAXQ7665A- MAXQ7665D的主要特性，方框图和典型工作电路，以及MAXQ7665评估板的详细电路图和所用元件列表．

The MAXQ7665A–MAXQ7665D smart systems-on-a-chip (SoC) are data-acquisition systems based on a microcontroller (μC). As members of the MAXQ family of 16-bit, reduced instruction set computing (RISC) μCs, the MAXQ7665A–MAXQ7665D are ideal for low-cost, low-power, embedded applications such as automotive, industrial controls, and building automation. The flexible, modular architecture design used in these μCs allows development of targeted products for specific applications with minimal effort.

The MAXQ7665A–MAXQ7665D incorporate a high-performance 16-bit RISC core, a 12-bit 500ksps SAR ADC with a programmable gain amplifier (PGA), and a full CAN 2.0B controller supporting transfer rates up to 1Mbps. These devices include a 12-bit DAC with a buffered voltage output and on-chip oscillator circuitry to operate from an external high frequency (8MHz) crystal. There is also a built-in internal RC oscillator as an alternative to using an external crystal. The MAXQ7665A–MAXQ7665D contain an internal temperature sensor to measure die temperature and a remote temperature-sensor driver. The analog functions and digital I/O are powered from a +5V supply, while the internal digital core is powered from +3.3V, which can be supplied by an on-chip linear regulator. These devices also include a dual power-supply supervisor with reset and a JTAG interface for in-system programming and debugging. The 16-bit RISC μC includes up to 128KB (64K x 16) of flash memory and 512 bytes (256 x 16) of RAM.

The MAXQ7665A–MAXQ7665D are available in a 7mm x 7mm 48-pin TQFN package and are specified to operate from -40℃ to +125℃.

MAXQ7665A–MAXQ7665D 主要特性:

High-Performance, Low-Power, 16-Bit RISC Core

8MHz Operation, Approaching 1MIPS per MHz

Low Power (< 3mA/MIPS, DVDD = +3.3V)

16-Bit Instruction Word, 16-Bit Data Bus

33 Instructions (Most Require Only One Clock Cycle)

16-Level Hardware Stack

Three Independent Data Pointers with Automatic Increment/Decrement

Program and Data Memory

Up to 128KB (64K x 16) Internal Flash

512 Bytes (256 x 16) Internal RAM

Smart Analog Peripherals

Low-Power, Eight Differential-Channel, 12-Bit, 500ksps ADC

Programmable-Gain Amplifier, Software-Selectable Gain:

1V/V, 2V/V, 4V/V, 8V/V, 16V/V, 32V/V

12-Bit DAC with Buffered Voltage Output

External References for ADC and DAC

Internal (Die) and External Diode Temperature Sensing

Timer/Digital I/O Peripherals

Full CAN 2.0B Controller

15 Message Centers (256-Byte Dual Port Memory)

Programmable Bit Rates from 10kbps to 1Mbps

Standard 11-Bit or Extended 29-Bit Identification Modes

Two Data Masks and Associated IDs for DeviceNET, SDS and Other Higher Layer CAN Protocols

External Transmit Disable for Autobaud

SIESTA Low-Power Mode

Wake-Up on CANRXD Edge Transition

UART (LIN) with User-Programmable Baud Rate

16 x 16 Hardware Multiplier with 48-Bit Accumulator, Single Clock Cycle Operation

Three 16-Bit (or Six 8-Bit) Programmable Timer/Counter/PWM

Eight General-Purpose, Digital I/O Pins, with External Interrupt Capability

All Interrupts Can Be Used as a Wake-Up

Crystal/Clock Module

Internal Oscillator for Use with External Crystal

On-Chip RC Oscillator Eliminates External Crystal

External Clock-Source Operation

Programmable Watchdog Timer

Power-Management Module

Power-On Reset (POR)

Power-Supply Supervisor/Brownout Detection for Digital I/O and Digital Core Supplies

On-Chip +3.3V, 50mA Linear Regulator

JTAG Interface

Extensive Debug and Emulation Support

In-System Test Capability

Flash-Memory-Program Download

Software Bootstrap Loader for Flash Programming

Ultra-Low-Power Consumption

Low-Power, Stop Mode (CPU Shutdown)

MAXQ7665A–MAXQ7665D应用:

Automotive Steering Sensors

CAN- and LIN-based Automotive Sensors

Industrial Control



图1.MAXQ7665A–MAXQ7665D方框图



图2.MAXQ7665A–MAXQ7665D典型工作电路

MAXQ7665评估板

The MAXQ7665 evaluation kit (EV kit) is a convenient platform for evaluating the capabilities of the MAXQ7665 data-acquisition microcontroller (μC). The kit contains all the hardware needed to interface to a PC and run demo application software. The EV kit also includes external temperature sensors, along with the MAXQ7665 internal sensor, and a CAN transceiver for connecting to automotive networks.

EV Kit Contents

MAXQ7665 EV Kit PCB

RS-232 Serial-Port Cable for Programming and Debugging

12V, 1.5A DC Power Supply

MAXQ7665 EV Kit Quick Start CD

Additional Shunts for Jumper Configuration

MAXQ7665评估板主要特性:

MAXQ7665 16-Bit RISC Data-Acquisition μC 64KB (32K x 16) Flash Memory

512 Bytes (256 x 16) Data RAM

Magnetic Sensors

UART/LIN Physical Interface

RS-232

LIN

IIC EEPROM—2KBytes

External 4.096V Voltage Reference

Internal/External Temperature Sensors

MAXQ7665 Internal Temp Sensor

External Transistor Temp Sensor

External Linear Temp Sensor

Serial-to-JTAG Interface for Program/Debug

External Power Supplies with Brownout

CAN Interface

MAXQ7665评估板元件列表:









图1. MAXQ7665评估板电路图(1)



图2. MAXQ7665评估板电路图(2)



图3. MAXQ7665评估板电路图(3)



图4. MAXQ7665评估板电路图(4)



图5. MAXQ7665评估板电路图(5)



图6. MAXQ7665评估板电路图(6)



图7. MAXQ7665评估板电路图(7)



图8. MAXQ7665评估板电路图(8)