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PDF ( 数据手册 , 数据表 ) ADM1191

零件编号 ADM1191
描述 Digital Power Monitor
制造商 Analog Devices
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ADM1191 数据手册, 描述, 功能
Data Sheet
Digital Power Monitor
with Convert Pin and ALERTB Output
ADM1191
FEATURES
Powered from 3.15 V to 26 V
Precision current sense amplifier
Precision voltage input
12-bit ADC for current and voltage readback
Convert (CONV) pin for commanding an ADC read
SETV input for setting overcurrent alert threshold
ALERTB output provides an overcurrent interrupt
I2C fast mode-compliant interface (400 kHz maximum)
2 address pins allow 16 devices on the same bus
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunications and data communications equipment
PCs/servers
GENERAL DESCRIPTION
The ADM1191 is an integrated current sense amplifier that
offers digital current and voltage monitoring via an on-chip
12-bit analog-to-digital converter (ADC), communicated
through an I2C® interface.
An internal current sense amplifier measures voltage across the
sense resistor in the power path via the VCC pin and the SENSE pin.
A 12-bit ADC can measure the current seen in the sense
resistor, as well as the supply voltage on the VCC pin.
An industry-standard I2C interface allows a controller to read
current and voltage data from the ADC. Measurements can be
initiated by an I2C command or via the convert (CONV) pin.
The CONV pin is especially useful for synchronizing reads on
multiple ADM1191 devices. Alternatively, the ADC can run
continuously, and the user can read the latest conversion data
whenever it is required. Up to 16 unique I2C addresses can be
created, depending on the way the A0 pin and the A1 pin are
connected.
A SETV pin is also included. A voltage applied to this pin is
internally compared with the output voltage on the current
sense amplifier. The output of the SETV comparator asserts
when the current sense amplifier output exceeds the SETV
voltage. When this event occurs, the ALERTB output asserts.
FUNCTIONAL BLOCK DIAGRAM
ADM1191
CONV
VCC
V
0
SENSE
A
CURRENT
SENSE
AMPLIFIER
I
1
MUX
12-BIT
ADC
SDA
I2C SCL
A1
A0
SETV
COMPARATOR
ALERT
GND
Figure 1.
ALERTB
3.15V TO 26V
RSENSE
VCC SENSE
ALERTB
ADM1191
SETV
SDA
SCL
CONV
GND
A1
A0
CONTROLLER
INTERRUPT
P = VI
SDA
SCL
CONV
Figure 2. Applications Diagram
The ALERTB output can be used as a flag to warn a micro-
controller or field programmable gate array (FPGA) of an
overcurrent condition. ALERTB outputs of multiple ADM1191
devices can be tied together and used as a combined alert.
The ADM1191 is packaged in a 10-lead MSOP.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2006–2012 Analog Devices, Inc. All rights reserved.







ADM1191 pdf, 数据表
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
ADM1191
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 4 8 12 16 20 24
VCC (V)
Figure 4. Supply Current vs. Supply Voltage
28
1000
900
800
700
600
500
400
300
200
100
0
2046
2047
2048
CODE
2049
2050
Figure 7. ADC Noise with Current Channel, Midcode Input, and 1000 Reads
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–40
–20 0
20 40 60
TEMPERATURE (°C)
Figure 5. Supply Current vs. Temperature
80
1000
900
800
700
600
500
400
300
200
100
0
779
780 781 782
CODE
783
Figure 8. ADC Noise with 14:1 Voltage Channel, 5 V Input, and 1000 Reads
00 DECODE
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–35 –30
–25
01 DECODE
–20 –15 –10
IA0/IA1 (µA)
10 DECODE 11 DECODE
–5 0
5 10
Figure 6. Address Pin Voltage vs. Address Pin Current
for Four Addressing Options on Each Address Pin
1000
900
800
700
600
500
400
300
200
100
0
3078
3079
3080
CODE
3081
3082
Figure 9. ADC Noise with 7:1 Voltage Channel, 5 V Input, and 1000 Reads
Rev. C | Page 7 of 16







ADM1191 equivalent, schematic
Data Sheet
APPLICATIONS INFORMATION
ALERTB OUTPUT
The ALERTB output is an open-drain pin with 30 V tolerance.
This output can be used as an overcurrent flag by connecting it
to the general-purpose logic input of a controller. During normal
operation, this output is pulled high (an external pull-up resistor
should be used because this is an open-drain pin). When an
overcurrent condition occurs, the ADM1191 pulls this output low.
The ALERTB pin is disabled by default on power up. See the
ALERT_EN register to enable.
3.15V TO 26V
RSENSE
VCC SENSE
ALERTB
ADM1191
SETV
SDA
SCL
CONV
GND
A1
A0
CONTROLLER
INTERRUPT
P = VI
SDA
SCL
CONV
Figure 25. Using the ALERTB Output as an Interrupt
SETV PIN
The SETV pin allows the user to adjust the current level that
trips the ALERTB output. The output of the current sense amplifier
is compared with the voltage driven onto the SETV pin. If the
current sense amplifier output is higher than the SETV voltage,
the output of the comparator asserts. By driving a different
voltage onto the SETV pin, the ADM1191 detects an overcurrent
ADM1191
condition at a different current level, with a gain of 18. See
Figure 12 for an illustration of this relationship.
RSENSE
ILOAD
VCC
SENSE
A CURRENT
SENSE
AMPLIFIER
ADM1191
APPLIED
VOLTAGE
SETV
COMPARATOR
ALERT
ALERTB
Figure 26. SETV Operation
KELVIN SENSE RESISTOR CONNECTION
When using a low value sense resistor for high current
measurement, the problem of parasitic series resistance can
arise. The pad and solder resistance can be a substantial fraction
of the rated resistance, making the total resistance larger than
expected. This error problem can be largely avoided by using a
Kelvin sense connection. This type of connection separates the
high current path through the resistor and the voltage drop
across the resistor. A 4-pad resistor may be used or a split pad
layout can be used with a 2-pad sense resistor to achieve Kelvin
sensing.
Rev. C | Page 15 of 16










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