|
|
PDF ADM1178 Data sheet ( Hoja de datos )
| Número de pieza | ADM1178 | |
| Descripción | Hot Swap Controller and Digital Power Monitor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADM1178 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
Hot Swap Controller and
Digital Power Monitor with ALERTB Output
ADM1178
FEATURES
Allows safe board insertion and removal from a live
backplane
Controls supply voltages from 3.15 V to 16.5 V
Precision current sense amplifier
Precision voltage input
12-bit ADC for current and voltage readback
Charge pumped gate drive for external N-channel FET
Adjustable analog current limit with circuit breaker
±3% accurate hot swap current limit level
Fast response limits peak fault current
Automatic retry or latch-off on current fault
Programmable hot swap timing via TIMER pin
Active-high ON pin
ALERTB output for overcurrent interrupt
I2C® fast mode-compliant interface (400 kHz maximum)
10-lead MSOP
APPLICATIONS
Power monitoring/power budgeting
Central office equipment
Telecommunication and data communication equipment
PCs/servers
GENERAL DESCRIPTION
The ADM1178 is an integrated hot swap controller and 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 senses voltage across the sense
resistor in the power path via the VCC pin and the SENSE pin.
The ADM1178 limits the current through this resistor by control-
ling the gate voltage of an external N-channel FET in the power
path, via the GATE pin. The sense voltage (and, therefore, the
inrush current) is kept below a preset maximum.
The ADM1178 protects the external FET by limiting the time
that it spends with the maximum current running in it. This
current limit period is set by the choice of capacitor attached
to the TIMER pin. Additionally, the device provides protection
from overcurrent events that may occur after the hot swap event
is complete. In case of a short-circuit event, the current in the
sense resistor exceeds an overcurrent trip threshold, and the
FET is switched off immediately by pulling down the GATE pin.
FUNCTIONAL BLOCK DIAGRAM
ADM1178
VCC
SENSE
MUX
V
0
I
A1
12-BIT
SDA
ADC
I2C SCL
ADR
CURRENT
SENSE
AMPLIFIER
ALERT
ALERTB
ON
1.3V
UV COMPARATOR
GND
FET DRIVE
CONTROLLER
TIMER
Figure 1.
GATE
3.15V TO 16.5V
RSENSE N-CHANNEL FET
VCC SENSE
GATE
ADM1178
ON SDA
SCL
ALERTB
TIMER
GND ADR
CONTROLLER
P = VI
SDA
SCL
INTERRUPT
Figure 2. Applications Diagram
A 12-bit ADC can measure the current seen in the sense
resistor, as well as the supply voltage on the VCC pin. An alert
output can be set to trigger when the ADC current reading
exceeds a programmed overcurrent limit threshold.
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.
The ADM1178 is packaged in a 10-lead MSOP.
Rev. 0
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
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
DataSheet4 U .com
1 page  
www.DataSheet4U.com
ADM1178
Parameter
Setup Time for a Repeated Start Condition,
tSU;STA
SDA Output Data Hold Time, tHD;DAT
Setup Time for a Stop Condition, tSU;STO
Bus Free Time Between a Stop and a Start
Condition, tBUF
Capacitive Load for Each Bus Line
Min
600
100
600
1300
Typ
Max Unit Conditions
ns
900 ns
ns
ns
400 pF
1 Monitoring accuracy is a measure of the error in a code that is read back for a particular voltage/current. This is a combination of amplifier error, reference error, ADC
error, and error in ADC full-scale code conversion factor.
DataSheet4 U .com
Rev. 0 | Page 5 of 24
5 Page 
www.DataSheet4U.com
120
115
110
105
100
95
90
85
80
2 4 6 8 10 12 14 16 18
VCC (V)
Figure 22. Circuit Breaker Limit Voltage vs. Supply Voltage
110
108
VOCFAST
106
104
102
VLIM
100
98 VOCTIM
96
94
92
90
–40
–20
0 20 40
TEMPERATURE (°C)
60
Figure 23. VOCTIM, VLIM, VOCFAST vs. Temperature
80
11 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
10 DECODE
–20 –15 –10
01 DECODE 00 DECODE
–5 0
5 10
IADR (µA)
Figure 24. Address Pin Voltage vs. Address Pin Current
for Four Addressing Options
ADM1178
1000
900
800
700
600
500
400
300
200
100
0
2046
2047
2048
CODE
2049
2050
Figure 25. ADC Noise, Current Channel, Midcode Input, 1000 Reads
1000
900
800
700
600
500
400
300
200
100
0
779
780 781 782
CODE
783
Figure 26. ADC Noise, 14:1 Voltage Channel, 5 V Input, 1000 Reads
1000
900
800
700
600
500
400
300
200
100
0
3078
3079
3080
CODE
3081
3082
Figure 27. ADC Noise, 7:1 Voltage Channel, 5 V Input, 1000 Reads
DataSheet4 U .com
Rev. 0 | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADM1178.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADM1170 | Hot Swap Controller | Analog Devices |
| ADM1171 | Hot Swap Controller | Analog Devices |
| ADM1172 | Hot Swap Controller | Analog Devices |
| ADM1173 | 2.7V to 16.5V Hot Swap Controller | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |