【选型】可pin to pin替代复位芯片ST STM6822的国产芯片推荐
复位是MCU工作的起点,良好的复位系统才能正常运行,对要求不高的场合可以采用电阻加电容的方式实现复位,但是需要稳定可靠复位,还要监控电源电压和程序是否跑飞,那就需要复位芯片了。
而芯片短缺不仅表现在MCU,还在继续围绕MCU蔓延。最近有些客户咨询复位芯片ST的STM6822的替代,需要做pin to pin的替代,复位芯片国产厂家还是比较多的思瑞浦、创瑞科技、圣邦微,经过一番对比,可以满足要求的有思瑞浦TPV6823和圣邦微SGM823,下图1为对主要参数对比,图2为引脚图对比。
图1 参数对比
图2(左为ST 中为圣邦微 右为思瑞浦)
芯片中的WDI引脚是看门狗计数器输入引脚,看门狗芯片检测这个引脚上是否发生了电平翻转,如果在看门狗的计时周内发生反转,看门狗计时器清零;如果没有发生则单片机程序存在异常,RST引脚输出复位信号,单片机复位。所以WDI引脚需要连接MCU,不能悬空,并且要在看门狗的定时周期达到前喂狗,这样程序才会正常运行。
带有WDI功能的复位芯片近期也是缺货严重,如果设计中没有使用WDI功能,可以考虑使用下图2的SGM804的复位芯片,也是在缺货现状下的一种备选方案,但是要调整引脚接线。SGM804的4脚没有和内部连接,可以接地或者保持开路。
图2
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目录- 线性产品 接口产品 隔离器件 数据转换器 线性稳压器与基准 电源监控 驱动器 DCDC 电池管理
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描述- 3PEAK is committed to the research and development of high-performance, high-quality, and highly reliable integrated circuit products, including signal chains, power analog chips, mixed-signal frontends, and embedded processors to provide customers with all-around solutions.
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【应用】思瑞浦电源监控复位芯片TPV706SL1-SR用在环境传感器上,功耗低至4μA,具有按键复位功能
关于外部看门狗芯片,市面上有非常多的选择,出于成本考虑,只能在国产品牌中选择。思瑞浦作为国内老牌的半导体厂商,其诸多产品均已饱经市场的考验,其质量和可靠性均已获得广泛认可。在本设计中,选择了电源监控复位芯片TPV706SL1-SR来环境传感器。
思瑞浦汽车行驶记录仪解决方案,一站式满足外围芯片需求
从信号链和电源管理角度出发,思瑞浦可为汽车行驶记录仪解决方案提供外围芯片全套解决方案。
TPV6823 Low Voltage Supervisory Circuit with Watchdog and Manual Reset
型号- TPV6823W-TR,TPV6823V-TR,TPV6823M-TR,TPV6823L-TR,TPV6823R-TR,TPV6823,TPV6823S-TR,TPV6823T-TR,TPV6823Z-TR,TPV6823Y-TR
思瑞浦(3PEAK)电源监控芯片选型表
功耗低至0.4μA,均可以保证电源低于1V时稳定输出复位信号,提供合业界标准的各种复位电压版本。
产品型号
|
品类
|
Status
|
Rating
|
Package
|
VCC (V)
|
Timing Control
|
Power-up Sequence Control
|
Power-down Sequence Control
|
Output Voltage (V)
|
Channel
|
TPK1032AFL1-S6TR
|
电源时序控制器
|
Production
|
Industrial
|
SOT23-3
|
2.7 ~ 5.5
|
11ms, 30ms, 60ms, 120ms, 2ms, 16ms
|
FLAG1->FLAG2->FLAG3
|
FLAG3->FLAG2->FLAG1
|
0 ~ VCC
|
3
|
选型表 - 思瑞浦 立即选型
思瑞浦参加汽车电子创新大会荣获“汽车电子创新企业“奖,6款汽车产品入选《国产车规芯片可靠性分级目录》
日前,AEIF2023汽车电子创新大会在无锡成功召开。思瑞浦致力于成为受尊重的模拟芯片和嵌入式处理器的领行者,聚焦汽车电子创新研发,携旗下全系列汽车电子产品与应用方案亮相AEIF2023。
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可支持TI AM335x/AM5718 和NXP iMX6/iMX8芯片定制核心板和计算单板;支持NXP iMX6核心模组X / F / H系列、TI AM335x核心模组X / N / H系列,与兼容的底板组合定制单板计算机。
最小起订量: 1pcs 提交需求>
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