探索ADM1184 ±0.8%精确四通道电压监测评估套件

一、引言

在电子设计中，电压监测是确保系统稳定运行的关键环节。ADM1184作为一款 ±0.8%精确的四通道电压监测器，为我们提供了可靠的电压监测解决方案。而EVAL - ADM1184评估套件则是我们深入了解和应用ADM1184的重要工具。今天，就让我们一起来详细了解这个评估套件。

文件下载：EVAL-ADM1184EBZ.pdf

二、评估套件特点

直观的状态指示

该评估套件配备了LED灯，能清晰直观地显示设备的运行状态。无论是主电源电压、四个被监测的电压轨，还是四个输出（OUT1到OUT3）以及系统电源正常信号（PWRGD），都能通过LED灯一目了然地呈现出来。这对于工程师快速判断设备状态非常有帮助，你是否在实际设计中也经常使用LED来指示状态呢？

便捷的操作开关

套件设有专用的电源开关和启用/禁用开关，方便工程师对设备进行控制。同时，板载的测试点允许对ADM1184的运行情况进行检查，为调试和测试提供了便利。

三、评估套件内容

主要评估板

套件包含ADM1184主评估板，这是整个评估的核心部分。

样品芯片

还提供了2个ADM1184样品，方便工程师进行测试和验证。如果评估板上没有焊接芯片，在通电前将一个样品放入标记为U6的插座即可。

四、评估板硬件功能

连接器

Pin	Name	Function
J1 J3	Power connector Terminal block	J1 - 1: Connects the positive terminal of the bench power supply to the evaluation board J1 - 2: Connects the ground terminal of the bench power supply to the evaluation board J3 - 1: Connects a 9 V power supply to the evaluation board
		J3 - 2: Connects a 9 V power supply to ground

通过J1可以连接台式电源，J3可以连接9V电源，为评估板提供不同的供电方式。

开关

Switch	Description	Position	Function
S0	Switch for powering board on/off	9 V V CC	Set to this position when powering the board via J3 Set to this position when powering the board via J1
S1	Switch for turning on/off the 3.3 V rail which is monitored by the VIN1 pin	On position Off position	Enables Regulator U1 Disables Regulator U1
S2	Switch for turning on/off the 2.5 V rail which is monitored by the VIN2 pin	On position Off position	Enables Regulator U2 Disables Regulator U2
S3	Switch for turning on/off the 1.8 V rail which is monitored by the VIN3 pin	On position Off position	Enables Regulator U3 Disables Regulator U3
S4	Switch for turning on/off the 1.5 V rail which is monitored by the VIN4 pin	On position Off position	Enables Regulator U4 Disables Regulator U4
VR1	Rotary switch	N/A	Reduces the 3.3 V supply level when the switch is turned clockwise
VR2	Rotary switch	N/A	Reduces the 2.5 V supply level when the switch is turned clockwise
VR3	Rotary switch	N/A	Reduces the 1.8 V supply level when the switch is turned clockwise
VR4	Rotary switch	N/A	Reduces the 1.5 V supply level when the switch is turned clockwise

这些开关可以方便地控制各个电压轨的开启和关闭，以及调节电压水平。你在设计中如何选择合适的开关来满足不同的控制需求呢？

跳线

Jumper	Description	Default
J2	Connects J1 - 1 to J3 - 1	Not inserted
J5	Connects VR2 to the feedback pin of Regulator U2	Inserted
J6	Connects VR3 to the feedback pin of Regulator U3	Inserted
J8	Connects VR1 to the feedback pin of Regulator U1	Inserted
J12	Connects VR4 to the feedback pin of Regulator U4	Inserted

跳线的设置可以改变电路的连接方式，从而实现不同的功能。

LED

LED	Name	Function
D1	VCC	A red LED indicates that the board is powered on
D2	3.3 V (VIN1)	A yellow LED indicates the status of the 3.3 V supply voltage
D3	2.5 V (VIN2)	A yellow LED indicates the status of the 2.5 V supply voltage
D4	1.8 V (VIN3)	A yellow LED indicates the status of the 1.8 V supply voltage
D5	1.5 V (VIN4)	A yellow LED indicates the status of the 1.5 V supply voltage
D6	OUT1	A green LED indicates when the OUT1 output is asserted
D7	OUT2	A green LED indicates when the OUT2 output is asserted
D8	OUT3	A green LED indicates when the OUT3 output is asserted
D9	PWRGD	A green LED indicates when the PWRGD output is asserted

LED灯的状态可以实时反映设备的运行情况，为工程师提供直观的反馈。

测试点

Test Point	Function
1_5V	Connected to the 1.5 V rail
1_8V	Connected to the 1.8 V rail
2_5V	Connected to the 2.5 V rail
3_3V	Connected to the 3.3 V rail
GND	Connected to ground
GND1	Connected to ground
GND2	Connected to ground
GND3	Connected to ground
OUT1	Connected to the OUT1 pin of the ADM1184 device
OUT2	Connected to the OUT2 pin of the ADM1184 device
OUT3	Connected to the OUT3 pin of the ADM1184 device
PWRGD	Connected to the PWRGD pin of the ADM1184 device
VIN1	Connected to VIN1 pin of the ADM1184 device
VIN2	Connected to VIN2 pin of the ADM1184 device
VIN3	Connected to VIN3 pin of the ADM1184 device
VIN4	Connected to VIN4 pin of the ADM1184 device

测试点可以方便工程师对各个电压轨和输出信号进行测量和监测。

五、评估板操作

供电方式

评估板有两种供电方式：通过J3连接9V电源或通过J1连接台式电源。使用9V电源时，需将S2置于9V位置；使用台式电源时，将S2调整到VCC位置。

工作原理

ADM1184监测四个独立的电压轨，VIN1、VIN2、VIN3和VIN4引脚外部的电阻网络设置了被监测电压轨（3.3V、2.5V、1.8V和1.5V）的触发点。输出OUT1到OUT3仅取决于其关联的输入。当VINx输入电压达到0.6V时，经过30μs延迟后，相应的OUTx输出被置位。当所有四个被监测电源超过其编程阈值时，系统电源正常信号（PWRGD）被置位，该输出有190ms的内部延迟。如果任何一个被监测电源低于其编程阈值，相应的OUTx输出和PWRGD输出将被复位。

模拟上电序列

将四个旋转开关完全逆时针旋转，然后通过切换相关的专用开关S1到S4将四个电压轨上电，上电顺序可以任意。黄色LED（D2、D3、D4和D5）显示四个电压轨的状态，绿色LED（D6、D7、D8和D9）显示OUT1到OUT3输出和系统PWRGD信号的置位情况。可以很容易观察到电源正常信号置位的190ms延迟。

观察故障条件

通过四个旋转开关VR1到VR4可以模拟故障条件。顺时针旋转旋转开关会降低关联的输入电压。当VINx输入引脚的电压低于0.6V时，OUTx输出接地，PWRGD输出也立即复位。

六、评估板原理图

评估板的原理图详细展示了电路的连接方式，为工程师深入了解电路原理和进行调试提供了重要依据。

七、订购信息

物料清单

Qty	Reference Designator	Description	Part No. 1
2	C1, C16	0.1 μF, 0603 capacitor	FEC 432210
8	C2, C4, C5, C7, C9, C10, C11, C13	1 μF, 0603 capacitor	FEC 3188840
4	C3, C6, C8, C12	470 pF, 0402 capacitor	FEC 3019366
2	C14, C15	10 μF, 0603 capacitor	FEC 9753893
1	D1	0805 red LED	FEC 1021302
4	D2, D3, D4, D5	0805 yellow LED	FEC 1318247
4	D6, D7, D8, D9	0805 green LED	FEC 1318243
1	J1	2 - pin terminal block, connector/power	FEC 151789
5	J2, J5, J6, J8, J12	Jumper, SIP - 2P	FEC 1022247
1	J3	DC barrel power connector, connectorbarrel	FEC 224959
8	Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8	NPD SMD transistor, SOT - 23	FEC 1081239
21	R1, R2, R3, R8, R14, R17, R25, R26, R27, R28, R29, R30, R31, R32, R33, R36, R40, R41, R49, R53, R54	1 kΩ, 0805 resistor	FEC 9332383
1	R4	162 kΩ, 0805 resistor	FEC 1160272
2	R5, R7	36 kΩ, 0805 resistor	FEC 1108905
1	R6	115 kΩ, 0805 resistor	FEC 1140356
1	R9	76.8 kΩ, 0805 resistor	FEC 1141007
2	R10, R21	140 kΩ, 0805 resistor	FEC 1160268
1	R11	390 kΩ, 0805 resistor	FEC 9333185
2	R12, R48	200 kΩ, 0805 resistor	FEC 9332782
3	R13, R19, R52	100 kΩ, 0805 resistor	FEC 9332405
2	R15, R20	110 kΩ, 0805 resistor	FEC 9332464
1	R16	470 kΩ, 0805 resistor	FEC 9333282
1	R18	150 kΩ, 0805 resistor	FEC 9332626
1	R22	75 kΩ, 0603 resistor	FEC 9331522
1	R23	620 kΩ, 0805 resistor	FEC 9333444
1	R24	39 kΩ, 0805 resistor	FEC 9333177
1	R43	220 kΩ, 0805 resistor	FEC 9332839
1	R44	62 kΩ, 0805 resistor	FEC 9333436
1	R46	910 kΩ, 0805 resistor	FEC 9333657
1	R47	1.8 kΩ, 0805 resistor	FEC 9332715
5	S0, S1, S2, S3, S4	SPDT slide switch, SW - SPDT - SLIDE	FEC 1123875
4	VR1, VR2, VR3, VR4	Trimmer potentiometer, 1 M, VRES_ROTARY	FEC 9608290
16	1_5V, 1_8V, 2_5V, 3_3V, GND, GND1, GND2, GND3, OUT1, OUT2, OUT3, PWRGD, VIN1, VIN2, VIN3, VIN4	Testpoint	FEC 8731144
4	U1, U2, U3, U4	ADP3334ARM adjustable LDO regulator, MS08	Free issue by Analog Devices
1	U5	ADM1184 quad voltage monitor MS010	Free issue by Analog Devices
1	U6	10 - pin MSOP socket, MS010 - SKT	Abrel Products 6560102211
1	U7	3 - terminal 0.1 A positive voltage regulator, TO - 92	FEC 9489444

订购指南

Model	Description
EVAL - ADM1184EBZ 1	ADM1184 Evaluation Kit

ESD注意事项

该设备对静电放电（ESD）敏感，尽管产品具有专利或专有保护电路，但高能量ESD仍可能对设备造成损坏。因此，在操作时应采取适当的ESD预防措施，以避免性能下降或功能丧失。

总之，EVAL - ADM1184评估套件为我们提供了一个全面了解和应用ADM1184四通道电压监测器的平台。通过对该套件的深入研究和使用，我们可以更好地掌握电压监测技术，为电子设计提供更可靠的保障。你在使用类似评估套件时遇到过哪些问题呢？欢迎在评论区分享你的经验。