【经验】具备看门狗功能的国产处理器监控芯片SGM823在电梯运行监控产品中的应用及使用要点

时间： 2020-12-05 来源：世强

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SGM823是圣邦微电子推出的处理器监控芯片，具备上电复位、电压监控、看门狗输入和手动复位输入功能，非常适合于需要高可靠工作的工业类产品设计选用，并具备复位门限4.63V、3.08V、2.93V、2.63V 4种版本供灵活选择。SGM823典型应用电路如图1所示。

图1、SGM823典型应用电路

SGM823手动复位输入管脚nMR低电平有效，通常连接常开型手动复位按键开关，并且SGM823内部可消除按键抖动导致的复位不稳定性。看门狗输入管脚WDI通常连接系统主控芯片的IO，并需要主控定时进行IO输出电平改变来实现“喂狗”。当WDI管脚处于悬空或连接三态输出IO时， SGM823的“看门狗”功能将关闭。

SGM823复位输出时序如图2、3所示，该时序图描述了SGM823上电复位输出、下电电压监控功能和看门口输入复位功能。

图2、SGM823上下电复位输出时序图

图3、SGM823看门狗输入复位时序图

图2中SGM823上电复位输出功能，当VCC电压低于复位门限电压VnRST时，SGM823的复位输出nRESET管脚持续输出低电平；当VCC电压上升高于复位门限电压VnRST后，nRESET管脚经过Trp时间后拉高，Trp时间通常为200ms。图2 中SGM823下电电压监控功能，当VCC电压跌落低于复位门限电压VnRST后，经过trd延迟时间，SGM823的复位输出nRESET管脚拉低复位主控，Trd时间通常为110uS。

图3中SGM823看门狗输入复位功能，当主控端软件出现工作异常后，主控端将不能定时“喂狗”，当“喂狗”间隔时间超过 Twd时间，SGM823将拉低nRESET对主控进行复位，并对内部计时器进行复位清零。Twd通常为1.6s，但在-40℃到+125℃工作温度范围内，最小值为1.1s，最大值为2.4s，主控软件通常需要设置小于1.1s的“喂狗”间隔。

SGM823上电复位、输入电压监控功能和看门口输入复位功能，非常适合于系统需要进行上电复位，系统电源监控，主控软件监控的工业级产品设计选用。笔者有参与一款电梯运行监控产品设计，就选用了2.93V 复位门限版本SGM823-SXN5G芯片来实现主控端上电复位控制、电压监控和软件看门狗功能，设计电路如图4。RESET管脚输出WFM-RESET信号连接主控芯片复位管脚，看门狗输入WDI管脚连接主控IO输出，实现看门狗功能。

图4、SGM823实际应用电路

在使用SGM823时候需要注意SGM823的Twd通常为1.6s，如果主控IC上电启动时间超过1.6s，而且在上电过程中无法“喂狗”，SGM823将不停对主控进行复位，导致系统启动失败，可以采用在主控boot程序启动时候就进行喂狗规避该问题；并且如果主控芯片需要在线烧写程序，也需要注意避免因为“喂狗”超时导致的程序烧写失败。

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SGM DFAE训练负荷开关-OVP-Supervisor

描述- 本文详细介绍了高性能模拟负载开关及其在电源管理、监控、复位等系统中的应用。内容涵盖负载开关的定义、工作原理、数据手册参数、应用场景、保护特性、功耗和热管理等方面。同时，文章还列举了多种负载开关产品及其特性，如SGM25062、SGM2575A、SGM2566C等。

型号- SGM2594CD,SGM48757,SGM48111,SGM8544,SGM853,SGM452,SGM450,SGM2564,SGM2522A,SGM2594BD,SGM812C,SGM2040-3.3,SGM48220,SGM836,SGM61220,SGM8773,SGM2591B,SGM8252,SGM2591C,SGM8770,SGM2591A,SGM4578,SGM2553,SGM2036,SGM2575A,SGM809B,SGM48017,SGM2592AD,SGM803B,SGM2580F,SGM259X 系列,SGM2580G,SGM2580D,SGM2580E,SGM61430,SGM2580K,SGM2580I,SGM2592C,SGM2580B,SGM2580,SGM2580C,SGM2592A,SGM8713A,SGM2592B,SGM2580A,SGM8713B,SGM3157,SGM2576B,SGM2588,SGM66051,SGM2207,SGM802B,SGM25701,SGM61280,SGM40642,SGM25661,SGM2572,SGM7220,SGM2571,SGM485211,SGM4995,SGM2574,SGM2210,SGM8958,SGM2576,SGM706B,SGM2212,SGM25701B,SGM8558,SGM72204,SGM7227,SGM8955,SGM25701A,SGM7229,SGM8956,SGM809,LM2904,SGM2591AD,SGM803,SGM804,SGM2592CD,SGM61135,SGM801,SGM802,SGM40666S,SGM2594A,SGM810,SGM2594B,SGM811,SGM41518,SGM41512,SGM2594C,SGM6602,SGM4027,SGM2521,SGM259X,SGM7200X,SGM2523,SGM2566B,SGM2522,SGM2566C,SGM3699,SGM2525,SGM2578A,SGM2566A,SGM2528A,SGM41511,SGM61020,SGM2592BD,SGM48541,SGM2590,SGM2592,SGM2591,SGM2594,SGM2593,SGM2596,SGM3206,SGM37892,SGM4535,SGM2567A,SGM811C,SGM2594AD,SGM851A,SGM851B,SGM2539,SGM708,SGM829,SGM41542,SGM41543,SGM42633,SGM827,SGM706,SGM828,SGM851C,SGM825,SGM61232,SGM826,SGM48211,SGM2591CD,SGM823,SGM824,SGM2572A,SGM40666AS,SGM2572B,SGM2584A,SGM2572C,SGM431,SGM460141,SGM2528B,SGM2528C,SGM2028,SGM3756,SGM810B,SGM2527,SGM2526,SGM48524D,SGM818,SGM816,SGM25062,SGM814,SGM2591BD,SGM815,SGM812,SGM8270N,SGM821,SGM8967-1,SGM40666BS,SGM8477,SGM41528,SGM8631,SGM708-S,SGM820,SGM708-T,SGM8197,SGM708-R,SGM8750,SGM4066X,SGM708-M,SGM6610,SGM708-L,SGM2531,SGM2521A,SGM2534,SGM708-J,SGM2533

2023/3/25 - SGMICRO - 商品及供应商介绍代理服务技术支持批量订货

SGMICRO-TI/ADI/MAXIM/MPS/SILERGY/ST等信号链电源芯片对照表

描述- 圣邦微SGMICRO与TI/ADI/MAXIM/LT/Onsemi/ST/Microchip/Nexperia/MPS/TOSHIBA/ROHM/RICHTEK/SILERGY/ABLIC/Renesas/Diodes/NXP/NJM/Infineon/Allegro 等品牌的信号链、电源芯对照表。

型号- SY8388,SN74HC541,A3981,IR44273,74AVC8T245Q,TS3A24159,TS3A24157,FAN3100,SLG88103,ADA4622-2,SLG88104,ADA4622-1,SGM2560,NA199,SGM2564,TSL6002,LMR23620,SGM48017C,LM431,FAN49103,MAX4282,SGM61220,BD9A201,74HC595,TLV3542,TLV3541,TS3A4751,TLV522,LMR23630,FAN53611,TC7SZ14FU,74LCX04,NCS21803,HCF4051,NCS21801,HCF4052,74LCX08,HCF4053,TSC214I,TLV3544,LMP2022,TSB611,NL27WZ04,SGM2588,FAN53601,SN74HC573,SN74HC574,INA333,TSU101,TSC213I,TSU102,NTMFS4C10N,UCC27531-Q1,TSU104,RT8293,74HC573,74HC574,SGM621,RT8290,SGM41600,TSB621,SGM620,SGM2572,SGM41603,SGM2571,SGM2576,SGM2575,SGM2578,SGM8T245S,RT8296,NL17SG07,SGM8557-1,TSU111,SGM8557-2,TSU112,ESD103-B1-02,INA321,TLV2242,TLV2241,SGM2205-12XK3G,ISL28118,OPA2277,BU30TD2,LM5109,BQ25619,SGM48013C,BQ25618,INA317,BQ25611,SGM62110,SGM62112,FSA4157,TPS76933,SGM2593,XB6091IS,BQ25601,TPS76950,BQ25600,SGM61230,TXS0104,TXS0102,SGM61232,SGM61234,TLV8801,TXS0101,SGM61233,74HC123,SGM5349-16,TLV62084,SGM431V,LTC2054,TPS51200,LTC2050,TLV8812,TLV8811,SGM61235,TLV8802,RT8253,BD9D323,BD9D322,AD5541,PMPB27EP,TPS54302,SGM4553YXET,LM7322,SGM8706,LM7321,SGM8707,SGM8701,MAX4664,LPV7215,SGM12UB1D2,AP2191,SGM3001,SGM42513,74LVC245A,SGM3005,TPS61099,SGM3002,SGM8276-2,TPS7A8300,SGMOP17C,TPS2553,ISL28130,TPS2556,TPS2557,SGM42403Q,SGM42553,BD6222,SGM8255B-2,ISL28134,74AHC1G08GV,TPS2551,74HC165,SGM62116,SGM62118,SGM62117,TPS3852-Q1,MAX4684,74HC164,AP2172,A3916,AP2171,TPS560430,A3918,BQ25638,SGM8709,U74LVC126,MP8676,SGM61280,MCP6V16,SGM42544,NCP718,LMX331,LMR36520,LM27761,TC7SZ32FU,SN74LVTH162373,ADM708,ADM707,SGM38042,SGM38046,TPS54340,MAX4230,TPS3823,LM2904,TC74VHC138,LM2902,LM2903,SGM8740,SGM2077A,SGM8742,SGM2077B,SGM8743,PESD5V0F1BSF,SGM41515A,MIC5209,LPV802,LPV801,SGM8748,SGM8749,NLAS44599,TPS54336,SGM40666A,SGM8746,TC74VCX16245,TPS54331,74LCX32,TPS54335,SGM41513D,SGM41513A,MCP6406,FTL75939,OPA548,SGM8957-1,MCP6402,SGM8957-2,TLV6208,SGM5223,MAX4232,TC74LCX16244,MAX4231,TPS3808,SN74LVC2T45,OPA2333P,MAX4236,SGM8551XN,TPS3840,TPS54320,SGM48018C,OPA990,RT4730,SGM41512A,SGM8745X,SN74AHC1,MAX9938,74LVTN16244,74LVTN16245,LPV821,SGM48019C,MCP6V52,MCP6V51,RT4723,OPA2210,TLV755P,SN74AC244,MCP6V54,AW2027,SGM8604-2XTDU8G,SGM8750,LPV812,LPV811,AD8534,SGM41283,SGM5353-16,AP2120,AD8539,AD8538,74LVC125,MCP6V69,74LVC126,SGM41285,DRV8313,MCP6V67,SN74LVC2G66,SGM7SZ244S,CAT4104,TS321,SGM8429C-4,AD5593R,SGM61430A,MP28373,MP5121,TMP108,74LVT16373,SGM8304,MAX40078,AD8541,74LVT16374,MCP6442,TMP103,TMP102,MP9943,MP9942,AP2112,MCP6V79,NCV890100,SGM13003A,MCP6V76,STSPIN250,MCP6V77,74LVTH125,SGM8770,AP2114,SGM38042B-1,LM2841,AD8513,AD621,AD620,NCS20034,SGM65230,NCS20032,AD623,AD8515,SGM65231,AD627,TC7SPN334,SGM13002A,SGM8477-1,SGM2035C,SGM41291,SGM2036S,MCP6V96,TUSB320,74LVC138,SGM7SZ245S,SGM8958-2,SGM41296,SN74CBT3245,MP9928,SGM41298,SGM8958-1,SGM6132,MAX4736,SGM6130,AD8532,AD8531,MAX4730,TPS3422,SGM833A,MCP6472,SGM833B,TLV1702,SGM7SZ32,SQ27403,MC74LVC74,TPS3420,TPS3421,TP2011,SGM2037H,MUX36S08,BISS0002,MC74AHC08,74LVC373A,TPS2595XXDSG,MCP6001,TPS3895,AD8502,TPS3896,TPS3897,AD8500,MCP6002,TPS3898,AP2151,SGM41282C,TPS3899,AD8506,AD8505,TLV7021,SGM832A,TP2025,MC33074,TP2021,MCP6004,MCP6006,LT7183,74LVC374A,AP2141,SN74LVC2G04,MCP6492,74LVC1G126,74LVC1G125,SGM48535B,SGM7SZ14,SGM48535A,SGM48752X,TPS2596,BU28TD2WNVX,AS179,XC6201,SGM15CB1A4,XC6206,TC7WZ04,SN74LVC2G14,MCP6022,SGM2210P,SGM7SZ08,MCP6024,SGM834A,SN74LVC2G17,MCP6021,SGM834B,SGM7SZ04,MP2497,SGM7SZ00,IRL44273LPBF,SGM48753X,SGM48754X,AD5592R,TLV61046A,TPS7A8400,SGM48753,SY8301,SGM48754,SQ24335,SGM2211S,SGM48757,ISL21080,SGM48759,SY8303,MCP6032,MCP6031,SGM48751,SGM48752,SGMNQ07430,SGM61720,TSV911,TSV912,TSV914,SN74AVC16T245,MP2490,SGM05UB1B3,LPV324,OPA4379,OPA4374,HD3SS3412,MCP6044,OPA4376,OPA2192,MCP6041,74VHC244,LMR16030,74AHCT595,APD7118,OPA2197,TPS62730,MCP6042,OPA2196,SN74AVC8T245,SN74LVC157,OPA2191,ADG509,ADG508,SGM8478-1C,FSA2457,TMUX415,TC7SZ00,LM1117,AD8599,TPS62743,TSV6192,SN74LVC125,SGM706S,SN74LVC126,RT6160,TPS76901,TC7SZ07,SGM2564A,TLV707P,NTMFS4C06N,MP2451,TS393,LMH6643,TC74VCX164245,SN74LVC138,SGM48760,SGM25662,MIC708,MCP6061,MP2460,LME49726,RT6150,MIC706,SN74AHCT86,MCP6074,TC7SH125F,STSPIN220,APD196,SGMOP07,74HC541,TC7SET08,LMC7211,BQ25890H,MAX706,MAX9119,MAX708,MCP6071,SGM2566C,74AHC573D,TC7SZ32,BU33TD2,74LVC157,YDA145,BD9G341,SGM2567S,NJMOP2277,INA828,LPV358,NCP382,NE5532,SGM2217Q,LMG1025-Q1,NCV6324,SGMNQ40430,NCV6334,SGM48536BQ,SGM21102G,74AHCT86,BGA524N6,SGM21102C,FSA2466,SGM21102B,INA818,SGM21102A,SGM05FB1E2,SN74AHC244,TLV74118,TC7SZ32F,NC7WZ04,74AVC8T245BQ,TSV991,TSV992,TSV994,SGM3851A,SGM48536CQ,TC913,74AHC244,AD8571,74AVC2T45,SGM2521A,TLV74128,SN74LVC541,AZ1117,LMV881,BU28TD2,MAX14589,TLV2316,SGM61330,SGM724,TS5V330,SGM5209-14,74LV541A,SGM3758,NJU7076,MAX4163,MAX4162,PESD15VW1BCSF,TLV74133,TPS25921A,OP213,TLV74130,SGM722,TLV2333,SGM723,SGM721,SGM8610-2,NLAS3899,OPA2140,EL5420,MAX4174,MAX4173,SGM15UB1E2,TC7SH126FU,SGM41100A,SGM61310,SKY13351,A4980,SGM41100V,SGM61306,SGM61305,SGM61308,SGM61307,SGM8262-2,TC7PZ14,SGM3795,74LCX126,74LCX125,74LVC541A,SGM3799,SA4159

对照表 - SGMICRO

SGMICRO（圣邦微）ADC/DAC选型指南

型号- SGM51242R8,SGM5353-16,SGM8634C,SGM71612R82Z,SGM71612R81ZXG/TR,SGM51652H8,SGM58200,SGM61720,SGM5209-14,SGM58201,SGM71612R82,SGM51652H4,SGM42403,SGM452,SGM5347-12,SGM51652H4XTS38G/TR,SGM51652HXTS16G-S/TR,SGM58602,SGM71612R82M,SGM2048,SGM58600,SGM71612R81,SGM58601,SGM5347-10,SGM58031Q,SGM42402,SGM42401,SGM8T245XS,SGM71612R81Z,SGM48751X,SGM12UB1D2,SGM51652HX,SGM4029A,SGM6143X,SGM4573,SGM7SZ244,SGM8253,SGM2033,SGM51242R4,74LVC245A,SGM51652H4XTS38G-S/TR,SGMXXXXX,SGM51242R2,SGM58600XTRL20G/TR,SGM5351-16,SGM61030,SGM51622S8XLFH64G/TR,SGM4875XX,SGM58600XSS20G/TR,SGM25701,SGM8270,SGM51610S,SGM58601XSS28G/TR,SGM2050,SGM58031,SGM5200,SGM862,SGM71612R8XX,SGM6130X,SGM2054,SGM860,SGM8277,SGM,SGM51622H,SGM204X,SGM2059,SGM51622D,SGM51610C,SGM89XB,SGM5202-14,74AHC14,SGM61410,SGM5353,SGM51613HXTS16G/TR,SGM71612R8,SGM51652HBXTS38G-S/TR,74AHC08,SGM61411,SGM5208-14,SGM8610,SGM51652H,SGM58601XTQK28GITR,SGM71612R81ZXTSG16G/TR,SGM51652D,SGM5348-10,SGM51652S8XLFH64G/TR,SGM5348-8,SGM5348-12,SGM5349,SGM5355-16,GRM2030,SGM51613HXTQE16G/TR,SGM823,SGM61630,SGM71612R81ZXTS16G/TR,SGM51613H,SGM51622S8,SGM5349-16,SGM8249,SGM51613D,SGM8255B,SGM5860X,SGM5352-16,SGM05FB4D2,SGM4027A,SGM51652H8XTS38G/TR,SGM4551,SGM05FB8D2,SGM5200Q,SGM51652S8,SGM5347-8,SGM80XB

May 2024 - SGMICRO - 选型指南代理服务技术支持批量订货

带看门狗定时器和手动复位的SGM823 5针微处理器监控电路

描述- SGM823是一款五引脚微处理器监控电路，集成了复位、看门狗定时器和手动复位功能。该器件采用SOT-23-5封装，具有超低供电电流（典型值小于1μA），并具备优异的抗瞬态电压能力。它提供四种固定的VCC复位阈值电压选项，能够在-40℃至+125℃的温度范围内工作。SGM823适用于计算机、便携式设备和汽车设备等领域。

型号- SGM823-L,SGM823-TXN5G/TR,SGM823-SXN5G/TR,SGM823-LXN5G/TR,SGM823-R,SGM823-T,SGM823-RXN5G/TR,SGM823-S,SGM823

NOVEMBER 2023 - SGMICRO - 数据手册 - REV. A. 3 代理服务技术支持批量订货查看更多版本

带看门狗定时器和手动复位的SGM823S微处理器监控电路

描述- SGM823S是一款集成了复位、看门狗定时器和手动重置功能的微处理器监控电路。该器件采用SOT-23-5封装，具有超低供电电流（典型值为0.8μA），并具备优异的抗瞬态干扰能力。它提供七个固定的VCC复位阈值电压选项，可在-40℃至+125℃的温度范围内工作。

型号- SGM823S-TXN5G/TR,SGM823S-SXN5G/TR,SGM823S-RXN5G/TR,SGM823S-VXN5G/TR,SGM823S-WXN5G/TR,SGM823S-T,SGM823S-LXN5G/TR,SGM823S-S,SGM823S-R,SGM823S-Y,SGM823S-YXN5G/TR,SGM823S-W,SGM823S,SGM823S-V,SGM823S-L

OCTOBER 2023 - SGMICRO - 数据手册 - REV. A.1 代理服务技术支持批量订货

【选型】可替换TI TPS3823-33DBVR的SGM823-SXN5G/TR助力便携式监测仪，0.5uA更低静态电流

在便携式监测仪设计时，监控MCU供电电压状态一般需要颗集成电压检测+看门狗的监控IC。之前不少客户会选择TI的TPS3823-33DBVR进行设计，但随着国产化和低成本需求日益增多，急需找一颗高性价国产监控IC替换。推荐圣邦微圣邦微监控IC SGM823-SXN5G/TR，本文从电性能参数、封装等方面分析SGM823-SXN5G/TR可完美替换TI TPS3823-33DBVR。

2020-06-25 - 器件选型代理服务技术支持批量订货

SGMICRO微处理器复位芯片选型表

SGMICRO微处理器复位芯片包含复位芯片、看门狗和计时器和电压检测器；手动复位、看门狗复位、电压排序，推挽/开漏输出，复位时间可调，最大10S复位时，复位电压可调。

产品型号	品类	Package	Reset Active Timeout Period (ms)	SupplyCurrent (μA)	VCC (Max)(V)	VCC (Min)(V)	Manual Reset
SGM708	Reset ICs	SOIC-8	200	20	5.5	1	Manual Reset