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ADM1192 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM1192
Beschreibung Digital Power Monitor
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 21 Seiten
ADM1192 Datasheet, Funktion
Data Sheet
Digital Power Monitor
with Clear Pin and ALERT Output
ADM1192
FEATURES
Powered from 3.15 V to 26 V
Precision current sense amplifier
Precision voltage input
12-bit ADC for current and voltage readback
ALERT output allows basic P-channel FET hot swap up to 26 V
SETV input for setting overcurrent alert threshold
Programmable overcurrent filtering via TIMER pin
CLRB input pin
I2C fast mode-compliant interface (400 kHz maximum)
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunications and data communications equipment
PCs/servers
GENERAL DESCRIPTION
The ADM1192 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
and in 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. Alternatively, the ADC can run continuously, and
the user can read the latest conversion data whenever it is
required. Up to four unique I2C addresses can be created,
depending on the way the ADR pin is 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. This
event is detected at the ALERT block. The ALERT block then
charges up the external TIMER capacitor with a fixed current.
When this timing cycle is complete, the ALERT output asserts.
FUNCTIONAL BLOCK DIAGRAM
ADM1192
VCC
SENSE
V
0
I
A1
CURRENT
SENSE
AMPLIFIER
MUX
12-BIT
ADC
SDA
I2C SCL
ADR
SETV
COMPARATOR
ALERT
GND
CLRB TIMER
Figure 1.
ALERT
3.15V TO 26V
RSENSE
VCC SENSE
ALERT
ADM1192
SETV
SDA
SCL
CLRB
TIMER
GND ADR
CONTROLLER
INTERRUPT
P = VI
SDA
SCL
CLRB
Figure 2. Applications Diagram
The ALERT output can be used as a flag to warn a micro-
controller or field programmable gate array (FPGA) of an
overcurrent condition. ALERT outputs of multiple ADM1192
devices can be tied together and used as a combined alert.
A basic P-channel FET hot swap circuit can be implemented
with the ALERT output. The value of the TIMER capacitor
should be set so that the charging time of this capacitor is much
longer than the period during which a higher than nominal
inrush current may be flowing.
The ADM1192 is packaged in a 10-lead MSOP.
Rev. D
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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 ©2006–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






ADM1192 Datasheet, Funktion
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VCC Pin
SENSE Pin
TIMER Pin
CLRB Pin
SETV Pin
ALERT Pin
SDA Pin, SCL Pin
ADR Pin
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering 10 sec)
Junction Temperature
Rating
30 V
30 V
−0.3 V to +6 V
−0.3 V to +6 V
30 V
30 V
−0.3 V to +6 V
−0.3 V to +6 V
−65°C to +125°C
−40°C to +85°C
300°C
150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ADM1192
THERMAL CHARACTERISTICS
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
10-Lead MSOP
θJA
137.5
Unit
°C/W
ESD CAUTION
Rev. D | Page 5 of 20

6 Page









ADM1192 pdf, datenblatt
Data Sheet
ADM1192
1
SCL
91
9
SDA
01
START BY MASTER
SCL
(CONTINUED)
1
01
1 ADRA ADRB R/W
D7
FRAME 1
SLAVE ADDRESS
ACKNOWLEDGE BY
SLAVE
9
D6 D5 D4 D3 D2 D1 D0
FRAME 2
COMMAND CODE
ACKNOWLEDGE BY
SLAVE
1
9
SDA
(CONTINUED)
D7 D6 D5 D4 D3 D2 D1 D0
FRAME 3
DATA BYTE
ACKNOWLEDGE BY
SLAVE
D7 D6 D5 D4 D3 D2 D1 D0
FRAME N
DATA BYTE
ACKNOWLEDGE BY
SLAVE
STOP
BY
MASTER
Figure 18. General I2C Write Timing Diagram
1
SCL
91
9
SDA
01
START BY MASTER
SCL
(CONTINUED)
1
01
1 ADRA ADRB R/W
D7
FRAME 1
SLAVE ADDRESS
ACKNOWLEDGE BY
SLAVE
9
D6 D5
1
D4 D3 D2
FRAME 2
DATA BYTE
D1 D0
ACKNOWLEDGE BY
MASTER
9
SDA
(CONTINUED)
D7 D6 D5 D4 D3 D2 D1 D0
FRAME 3
DATA BYTE
ACKNOWLEDGE BY
MASTER
D7 D6 D5 D4 D3 D2 D1 D0
FRAME N
DATA BYTE
NO ACKNOWLEDGE
STOP
BY
MASTER
Figure 19. General I2C Read Timing Diagram
SCL
tLOW
tR
tHD;STA
tHD;DAT
SDA
tBUF
PS
tF
tHIGH
tSU;DAT
tHD;STA
tSU;STA
S
Figure 20. Serial Bus Timing Diagram
tSU;STO
P
Rev. D | Page 11 of 20

12 Page





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