参数资料
型号: MAXQ7667AACM/V+
厂商: Maxim Integrated Products
文件页数: 13/40页
文件大小: 0K
描述: IC MCU-BASED DAS 16BIT 48-LQFP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 250
系列: MAXQ®
核心处理器: RISC
芯体尺寸: 16-位
速度: 16MHz
连通性: LIN,SPI,UART/USART
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 16
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
RAM 容量: 2K x 16
电压 - 电源 (Vcc/Vdd): 2.25 V ~ 2.75 V
数据转换器: A/D 5x12b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 48-LQFP
包装: 托盘
MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
20
______________________________________________________________________________________
SAR ADC Analog Input Track-and-Hold (T/H)
Figures 6 and 7 show the equivalent input circuit of the
MAXQ7667 analog input architecture. During acquisi-
tion (track), a sampling capacitor charges to the posi-
tive input voltage at AIN0–AIN4 in single-ended mode
or AIN0 and AIN2 in differential mode while a second
sampling capacitor connects to AGND in single-ended
mode or AIN1 and AIN3 in differential mode. The ADC
conversion start source and the ADC dual mode selec-
tion bits control the T/H timing.
Voltage Reference
The MAXQ7667 supports three possible voltage refer-
ence sources for ADC conversion; 2.5V internal
buffered bandgap reference, external source, and
AVDD. The internal 2.5V bandgap reference has high
initial accuracy and temperature coefficient of typically
less than 100ppm/°C. When operating in internal refer-
ence mode, either the buffered output of the internal
reference or AVDD connects to the SAR ADC while the
buffered output of the internal reference connects to the
sigma-delta ADC. When operating in external reference
mode, an external source ranging between 1V and
VAVDD applied at either the REF or REFBG inputs pro-
vides the reference to the SAR ADC and sigma-delta
ADC. Bypass REFBG and REF to AGND with a 0.47F
capacitor for optimum performance. See Section 14 of
the
MAXQ7667 User’s Guide.
Schedule Timer
The MAXQ7667’s schedule timer provides general time-
keeping and software synchronization to an external I/O.
The schedule timer features include the following:
16-bit autoreload up-counter for the timer
Programmable 16-bit alarm register
Alarm interrupts
Schedule timer incremented by a programmable
system clock prescaler (1, 1/2, 1/4, 1/8, 1/16, 1/32,
1/64, 1/128)
Schedule timer up-counter resettable through an
external I/O pin, which allows synchronization of a
schedule timer to an external event
Wake-up alarm to pull the system clock from stop-
mode to normal operation
Figure 8 shows a simplified block diagram of the
schedule timer.
AGND
AIN+
AIN-
CIN+
AVDD
CIN-
RIN+
RIN-
Figure 6. Equivalent Input Circuit (Track/Acquisition Mode)
AGND
AIN+
AIN-
CIN+
CIN-
RIN+
RIN-
AVDD
Figure 7. Equivalent Input Circuit (Hold/Conversion Mode)
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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
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