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Número de pieza | EMC1702 | |
Descripción | High-Side Current-Sense and Dual Temperature Monitor | |
Fabricantes | SMSC | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de EMC1702 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
No Preview Available ! EMC1702
High-Side Current-Sense and Dual
1°C Temperature Monitor
PRODUCT FEATURES
Datasheet
General Description
The EMC1702 is a combination high-side current sensing
device with precision temperature measurement. It
measures the voltage developed across an external sense
resistor to represent the high-side current of a battery or
voltage regulator. It also measures the source voltage and
uses these measured values to present a proportional
power calculation. The EMC1702 contains additional bi-
directional peak detection circuitry to flag instantaneous
current spikes with programmable time duration and
magnitude threshold. Finally, the EMC1702 includes an
external diode channel for temperature measurement as
well as an internal diode for ambient temperature
measurements.
The temperature measurement includes advanced features
such as Resistance Error Correction (REC), Beta
Compensation (to support CPU diodes requiring the
BJT/transistor model including 45nm and 65nm
processors), and automatic diode type detection.
Both current sensing and temperature monitoring include
two tiers of protection: one that can be masked and causes
the ALERT pin to be asserted, and the other that cannot be
masked and causes the THERM pin to be asserted.
Applications
Notebook and Desktop Computers
Industrial
Power Management Systems
Embedded Applications
Features
High-side current sensor
— Bi-directional current measurement
— Measures source voltage and indicates power ratio
— 1% current measurement accuracy
— Integrated over 82ms to 2.6sec with 11-bit resolution
— 3V to 24V bus voltage range
Independent hardware set instantaneous current peak
detector
— Software controls to program time duration and
magnitude threshold
Power supply options
— Bus or separately powered for low voltage operation
Wide temperature operating range: -40°C to +85°C
One external temperature monitor
— 1°C accuracy (20°C < TDIODE < 110°C) with 0.125°C
resolution
— Ideality factor setting
— Support for 45nm and 65nm CPU diodes requiring the
BJT/transistor model w/ beta compensation
— Determines external diode type and optimal settings
— Resistance Error Correction
Internal temperature monitor
— ±1°C accuracy (-5°C < TA < 85°C)
ALERT and THERM outputs for temperature, voltage,
and out-of-current limit reporting
SMBus 2.0 interface
— Pin-selectable SMBus Address
— Block Read and Write
Available in a 12-pin 4mm x 4mm QFN RoHS Compliant
Package
Block Diagram
Peak
Detection
DP External
Temp
Current Limits
DN Diode
Analog
13 - 15 bit
Σ Δ ADC
Current Registers
Mux
Internal
Temp
Diode
Configuration
11 - 15 bit
Σ Δ ADC
Power Register
Voltage and
Temp Registers
Voltage and
Temp Limits
SMBus
Slave
Protocol
ADDR_SEL
SMCLK
SMDATA
ALERT
THERM
SMSC EMC1702
DATASHEET
Revision 1.2 (09-27-10)
1 page High-Side Current-Sense and Dual 1°C Temperature Monitor
Datasheet
List of Figures
Figure 1.1
Figure 3.1
Figure 4.1
Figure 4.2
Figure 4.3
Figure 6.1
Figure 6.2
Figure 6.3
Figure 6.4
EMC1702 Pin Diagram 12-Pin QFN 4mm x 4mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
EMC1702 System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Peak Detection Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Diode Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
12-Pin QFN 4mm x 4mm Package Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12-Pin QFN 4mm x 4mm Package Dimensions and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . 54
12-Pin QFN 4mm x 4mm PCB Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
EMC1702 Package Markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
SMSC EMC1702
5
DATASHEET
Revision 1.2 (09-27-10)
5 Page High-Side Current-Sense and Dual 1°C Temperature Monitor
Datasheet
2.1 Electrical Specifications
Table 2.2 Electrical Specifications
VDD = VBUS = 3V TO 24V, VPULLUP = 3V TO 5.5V, TA = -40°C TO 85°C,
ALL TYPICAL VALUES AT VDD = VPULLUP = 3.3V, VBUS = 12V, AND TA = 27°C UNLESS OTHERWISE NOTED.
CHARACTERISTIC SYMBOL
MIN
TYP MAX UNIT
CONDITIONS
DC POWER
Supply Voltage
VDD
3
VDD Pin Supply
Current
IDD
VDD Pin Supply
Current
IDD_
T_STANDBY
VDD Pin Supply
Current
IDD_ALL_
STANDBY
SENSE+ Pin Bias
Current
ISENSE+
SENSE- Pin Bias
Current
ISENSE-
Pull-up Voltage
Leakage Current (±)
VPULLUP
ILEAK
3
24 V
Temp conversions at 0.0625
610
750
uA
conversions / second,
dynamic averaging disabled
current sense active
Temp conversions at 4
650
950
uA
conversions / second,
dynamic averaging disabled
current sense active
950 1100 uA
Temp conversions at 8
conversions / second,
dynamic averaging enabled
current sense active
Temp conversions disabled
750 uA
(TMEAS / STOP = ‘1’)
current sense active
Temp conversions disabled
300 uA
(TMEAS / STOP = ‘1’)
Current sense disabled
(IMEAS / STOP = ‘1’)
90
uA
VSENSE = 0V, VDD = 3V to 24V,
Current sense active
15
uA
VSENSE = 0V, VDD = 3V to 24V,
current sense disabled
10 20 uA
VDD = 0V
10
uA
VSENSE = 0V, VDD = 3V to 24V,
Current sense active
10
uA
VSENSE = 0V, VDD = 3V to 24V,
current sense disabled
0 uA VDD = 0V
5.5
V
Pull-up voltage for SMBus,
ALERT, and THERM pins
ALERT and THERM pins,
5
uA
SMDATA and SMCLK pins
powered or unpowered,
TA < 85°C
SMSC EMC1702
11
DATASHEET
Revision 1.2 (09-27-10)
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet EMC1702.PDF ] |
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