MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
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MAXQ is a registered trademark of Maxim Integrated Products, Inc.
Type 2 Timers/Counters
The MAXQ7667 includes three 16-bit timers/counters
with programmable I/O (Figure 9). Each timer is a Type
2 timer implemented in the MAXQ family. The Type 2
timer is an autoreload 16-bit timer/counter offering the
following functions:
8-bit/16-bit timer/counter
Up/down autoreload
Counter function of external pulse
Capture
Compare
Clock Sources
The MAXQ7667 oscillator module supplies the system
clock for the C core and all of the peripheral modules.
The high-frequency oscillator operates with a 1MHz to
16MHz crystal. Use the internal RC oscillator as the
system clock for applications that do not require pre-
cise timing. See Section 15 of the
MAXQ7667 User’s
Guide.
The MAXQ7667 supports the following master clock
sources:
Internal high-frequency oscillator drives an exter-
nal 1MHz–16MHz crystal or ceramic resonator
Internal, fast-starting, 13.5MHz RC oscillator
(default oscillator at startup and in the event the
external crystal fails)
External 4MHz–16MHz clock input
Crystal Selection
The MAXQ7667 requires a crystal with the following
specifications:
Frequency: 1MHz–16MHz
CLOAD: 6pF (min)
Drive level: 5W
Series resonance resistance: 30
(max)
Note: Quartz crystal vendors often specify series reso-
nance resistance (R1). Series resonance resistance is
the resistance observed when the resonator is in the
series resonant condition. When a resonator is used in
the parallel resonant mode with an external load capac-
itance, as is the case with the MAXQ7667 oscillator cir-
cuit, the effective resistance at the loaded frequency of
oscillation is:
R1 x (1 + (CO/CLOAD))2
For typical shunt capacitance (CO) and load capaci-
tance (CLOAD) values, the effective resistance poten-
tially exceeds R1 by a factor of 2.
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相关代理商/技术参数
MAXQ7667AACM+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAXQ7667EVKIT 功能描述:开发板和工具包 - 其他处理器 RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
MAXQ7667EVKIT+ 功能描述:开发板和工具包 - 其他处理器 MAXQ7667 Eval Kit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
MAXQ7667EVKIT-1# 功能描述:开发板和工具包 - 其他处理器 MAXQ7667EVKIT-1# RoHS:否 制造商:Maxim Integrated 产品: 工具用于评估: 核心: 接口类型: 工作电源电压:
MAXQ7668AACM/V+ 功能描述:16位微控制器 - MCU Integrated Circuits (ICs) Embedded - Microcontrollers - ADC 12BIT 8CH SER 2.7V LQFP RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
MAXQ7668AACM/V+T 功能描述:16位微控制器 - MCU Integrated Circuits (ICs) Embedded - Microcontrollers - ADC 12BIT 8CH SER 2.7V LQFP RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
MAXQ7668AACM+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAXQ7670 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Microcontroller with 10-Bit ADC, PGA, 64KB Flash, and CAN Interface