NSC ADC128D818CIMT 12-bit, 8-channel, adc system monitor with temperature sensor, internal/external reference, and i2c interface Datasheet

ADC128D818
12-Bit, 8-Channel, ADC System Monitor with Temperature
Sensor, Internal/External Reference, and I2C Interface
1.0 General Description
3.0 Features
The ADC128D818 I2C™ system monitor is designed for max-
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imum flexibility. The system monitor can be configured for
single-ended and/or pseudo-differential inputs. An on-board
temperature sensor, combined with WATCHDOG window
comparators, and an interrupt output pin, INT, allow easy
monitoring and out-of-range alarms for every channel. A high
performance internal reference is also available to provide for
a complete solution in the most difficult operating conditions.
The ADC128D818’s 12-bit delta-sigma ADC supports Standard Mode (Sm, 100 kbits/s) and Fast Mode (Fm, 400kbits/s)
I2C interfaces. The ADC128D818 includes a sequencer to
control channel conversions and stores all converted results
in independent registers for easy microprocessor retrieval.
Unused channels can be shut down independently to conserve power.
The ADC can use either an internal 2.56V reference or a variable external reference. An analog filter is included on the
I2C digital control lines to provide improved noise immunity.
The device also includes a TIMEOUT reset function on SDA
and SCL to prevent I2C bus lock-up.
The ADC128D818 operates from +3.0 to +5.5V power supply
voltage range, –40°C to 125°C temperature range, and the
device is available in a 16-pin TSSOP package.
2.0 Applications
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Communications Infrastructure
Thermal / Hardware Server Monitors
System Monitors
Industrial and Medical Systems
Electronic Test Equipment and Instrumentation
Power Supply Monitoring / Supervision
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12-bit Resolution Delta-Sigma ADC
Local Temperature Sensing
Configurable Single-Ended and/or Pseudo-Diff. Inputs
+2.56V Internal VREF or Variable External VREF
WATCHDOG Window Comparators with Status and Mask
Registers of All Measured Values
Independent Registers for Storing Measured Values
INT Output Notifies Microprocessor of Error Event
I2C Serial Bus Interface Compatibility
9 Selectable Addresses
TIMEOUT Reset Function to Prevent I2C Bus Lock-Up
Individual Channel Shutdown to Limit Power Consumption
Deep Shutdown Mode to Minimize Power Consumption
TSSOP 16-Lead Package
4.0 Key Specifications
■ ADC Resolution
12-bit
■ Supply Voltage Range
+3.0V to +5.5V
■ Total Unadjusted Error
–0.45/+0.2%
■ Integral Non-Linearity
±1LSb
■ Differential Non-Linearity
±1LSb
■ Operating Current
0.56 mA
■ Deep Shutdown Current
10 µA
■ Temperature Resolution
0.5°C/LSb
■ Temp. Accuracy (–40°C to 125°C)
± 3°C
■ Temp. Accuracy (–25°C to 100°C)
± 2°C
5.0 Typical Application
30096301
I2C® is a registered trademark of the Philips Corporation.
© 2010 National Semiconductor Corporation
300963
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ADC128D818 12-Bit, 8-Channel, ADC System Monitor with Temperature Sensor, Internal/
External Reference, and I2C Interface
April 1, 2010
ADC128D818
6.0 Ordering Information
Temperature Range
–40°C ≤ TA ≤ +125°C
Order Number
2
1-Rail
NS
Package
Number
Specified
Power
Supply
Voltage
MO-153
+3.0V to
+5.5V
Device Marking
ADC128D818CIMT1
ADC128D818CIMTX
Note:
6.0 Connection Diagram
ADC128D81
8CIMT
transport media, 61 parts per rail
and reel transport media, 2500 parts per reel
2-Tape
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7.0 Pin Descriptions
Pin
Number
Pin
Name(s)
ESD
Structure
Type
Description
1
VREF
Analog Input
ADC external reference.
ADC128D818 allows two choices for sourcing VREF:
internal or external. If the +2.56V internal VREF is used,
leave this pin unconnected. If the external VREF is used,
source this pin with a voltage between +1.25V and V+. At
Power-On-Reset (POR), the default setting is the internal
VREF.
Bypass with the parallel combination of 1 μF (electrolytic
or tantalum) and 0.1 μF (ceramic) capacitors.
2
SDA
Digital I/O
Serial Bus Bidirectional Data. NMOS open-drain output.
Requires external pull-up resistor to function properly.
3
SCL
Digital Input
4
GND
GROUND
5
V+
POWER
6
INT
Digital Output
Interrupt Request. Active Low, NMOS, open-drain.
Requires external pull-up resistor to function properly.
7-8
A0 - A1
Tri-Level Inputs
Tri-Level Serial Address pins that allow 9 devices on a
single I2C bus.
9 - 16
IN7 - IN0
Analog Inputs
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2
Serial Bus Clock. Requires external pull-up resistor to
function properly.
Internally connected to all of the circuitry.
+3.0V to +5.5V power. Bypass with the parallel
combination of 1 μF (electrolytic or tantalum) and
0.1 μF (ceramic) bypass capacitors.
The full scale range will be controlled by the internal or
external VREF. These inputs can be assigned as singleended and/or pseudo-differential inputs.
ADC128D818
8.0 Block Diagram
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9.0 Product Highlights
The maximum number of channels that can be enabled for each input mode are shown in the table below. Unusued channels may
be disabled through software.
TABLE 1. Input Modes
Modes of
Operation
Single-Ended Inputs
Pseudo-Differential
Inputs
0
7
-
1
88
1
8
-
-
96
2
-
4
1
52
3
4
2
1
76
3
Internal Temperature Cycle Time with Maximum
Measurement
Number of Channels Enabled
(ms - typ).
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ADC128D818
TABLE 2. Conversion Modes
Conversion Modes
Description
Continuous
Enabled channels are measured continuously.
Low Power
Enabled channels are measured, then the device is automatically placed into shutdown
mode. This cycle is repeated every 728 ms.
One-Shot
When One-Shot Register (address 09h) is programmed while the device is in shutdown or
deep shutdown mode, the device will initiate a single conversion and comparison cycle, after
which the device returns to the respective mode it was in.
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4
1, Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V+):
Voltage on SCL, SDA, A0, A1, INT:
Voltage on IN0-IN7, VREF:
Input Current at Any Pin (Note 3):
Package Input Current (Note 3):
Maximum Junction Temperature
(TJMAX): (Note 4)
ESD Susceptibility (Note 6)
Human Body Model:
Machine Model:
11.0 Operating Ratings
6.0V
–0.3V to 6.0V
–0.3V to (V+ + 0.3)V
and ≤ 6.0V
±5 mA
±30 mA
Supply Voltage (V+):
Voltage on SCL, SDA, A0, A1, INT:
Voltage on IN0-IN7, VREF:
3.0V to 5.5V
–0.05V to 5.5V
–0.05V to (V+ + 0.05)V and
≤ 5.5V
TMIN = –40°C
TMAX = 125°C
Temperature Range for Electrical
Characteristics:
150°C
(Note 1, Note 2)
–40°C ≤ TA ≤ +125°C
Operating Temperature Range:
Junction to Ambient Thermal
Resistance (θJA): (Note 5)
3,000V
300V
130°C/W
12.0 DC Electrical Characteristics
The following specifications apply for +3.0 VDC ≤ V+ ≤ +5.5 VDC , External VREF = +2.56V, unless otherwise specified. Boldface
limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C (Note 7).
Min
(Note 9)
Typical
(Note 8)
Max
(Note 9)
Units
Supply Voltage
3.0
3.3 or 5.0
5.5
V
External Reference Voltage
1.25
2.56
V+
V
Symbol
Parameter
Conditions
POWER SUPPLY CHARACTERISTICS
V+
VREF
I+
2.56
Internal Reference Voltage
Supply Current (see the "Power
Management" section for more
information).
V
23
ppm/°C
Interface Inactive, V+ = 5.5V, Mode 2
0.74
mA
Interface Inactive, V+ = 3.6V, Mode 2
0.56
mA
Shutdown Mode, V+ = 5.5V
0.65
mA
Shutdown Mode, V+ = 3.6V
0.48
mA
10
µA
±3
°C
±2
°C
Deep Shutdown Mode (Note 10).
TEMPERATURE-to-DIGITAL CONVERTER CHARACTERISTICS
Temperature Error
–40°C ≤ TA ≤ +125°C
–25°C ≤ TA ≤ +100°C
Resolution
0.5
°C
0.625
mV
ANALOG-to-DIGITAL CONVERTER CHARACTERISTICS
n
Resolution
12-bit with full-scale at VREF = 2.56V.
External VREF = 1.25V, PseudoDifferential, V+ = 3.0V to 3.3V. (Note
10)
INL
Integral Non-Linearity
External VREF = 2.56V, PseudoDifferential
External VREF = 5.0V, PseudoDifferential, V+ = 5.0V to 5.5V.
DNL
Differential Non-Linearity
(Note 13)
5
–1
0.36
1
LSb
–2
1.58
4
LSb
-1
±0.25
1
LSb
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ADC128D818
Charged Device Model:
1,000V
Storage Temperature
–65°C to +150°C
For soldering specifications,
see product folder at www.national.com and
www.national.com/ms/MS/MS-SOLDERING.pdf
10.0 Absolute Maximum Ratings (Note
ADC128D818
Symbol
Parameter
Conditions
Internal VREF, Single-Ended,
V+ = 3.0V to 3.6V.
Internal VREF, Single-Ended,
V+ = 4.5V to 5.5V (Note 12).
Internal VREF, Pseudo-Differential,
V+ = 3.0V to 3.6V or V+ = 4.5V to 5.5V
(Note 12).
TUE
Total Unadjusted Error (Note 11)
External VREF = 1.25V, Single-Ended,
V+ = 3.0V to 3.6V.
External VREF = 2.56V, Single-Ended,
V+ = 3.0V to 5.5V.
External VREF = 1.25V, PseudoDifferential, V+ = 3.0V to 3.6V.
External VREF = 2.56V, PseudoDifferential, V+ = 3.0V to 5.5V.
Min
(Note 9)
Typical
(Note 8)
Max
(Note 9)
Units
–0.5
0.5
% of FS
–0.3
0.5
% of FS
–0.6
0.1
% of FS
–0.45
0.2
% of FS
–0.25
0.45
% of FS
–0.45
0.2
% of FS
–0.15
0.2
% of FS
–0.5
0.1
% of FS
–0.2
0.15
% of FS
Internal VREF, V+ = 3.0V to 3.6V.
Internal VREF, V+ = 4.5V to 5.5V (Note
12)
GE
Gain Error
External VREF = 1.25V or 2.56V,
V+ = 3.0V to 3.6V.
External VREF = 2.56V or 5.0V,
V+ = 4.5V to 5.5V.
Internal VREF, PseudoDifferential, V+ = 4.5V to 5.5V (Note
12).
External VREF = 1.25V or 2.56V,
Single-Ended, V+ = 3.0V to 3.6V.
OE
Offset Error
External VREF = 2.56V or 5.0V, SingleEnded, V+ = 4.5V to 5.5V
External VREF = 1.25V or 2.56V,
Pseudo-Differential, V+ = 3.0V to 3.6V.
External VREF = 2.56V or 5.0V,
Pseudo-Differential, V+ = 4.5V to 5.5V
Continuous Conversion Mode
tC
Low Power Conversion Mode
Each Enabled Voltage Channel
12
ms
Internal Temperature Sensor
3.6
ms
Enabled Voltage Channel(s) and
Internal Temperature Sensor
728
ms
MULTIPLEXER / ADC INPUT CHARACTERISTICS
RON
On Resistance
ION
Input Current (On Channel
Leakage Current)
±0.005
μA
IOFF
Off Channel Leakage Current
±0.005
μA
2
10
kΩ
DIGITAL OUTPUTS: INT
VOUT(0)
Logical “0” Output Voltage
IOUT = +5.0 mA at V+ = +4.5V,
IOUT = +3.0 mA at V+ = +3.0V
0.4
V
OPEN DRAIN SERIAL BUS OUTPUT: SDA
VOUT(0)
Logical “0” Output Voltage
IOUT = +3.0 mA at V+ = +4.5V,
IOH
High Level Output Current
VOUT = V+
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0.005
6
0.4
V
1
μA
Parameter
Conditions
Min
(Note 9)
Typical
(Note 8)
Max
(Note 9)
Units
V
DIGITAL INPUTS: A0 and A1
VIN(1)
VIM
VIN(0)
Logical “1” Input Voltage
0.90 x V+
5.5
Logical Middle Input Voltage
0.43 x V+
0.57 x V+
GND 0.05
0.10 x V+
V
Logical “0” Input Voltage
SERIAL BUS INPUTS: SCL and SDA
VIN(1)
Logical “1” Input Voltage
0.7 × V+
5.5
v
VIN(0)
Logical “0” Input Voltage
GND 0.05
0.3 × V+
V
VHYST
Hysteresis Voltage
V+ = +3.3V
0.67
V
V+ = +5.5V
1.45
V
– 0.005
µA
ALL DIGITAL INPUTS: SCL, SDA, A0, A1
IIN(1)
Logical “1” Input Current
VIN = V+
IIN(0)
Logical “0” Input Current
VIN = 0 VDC
CIN
Digital Input Capacitance
−1
0.005
20
7
1
µA
pF
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ADC128D818
Symbol
ADC128D818
13.0 AC Electrical Characteristics
The following specifications apply for +3.0 VDC ≤ V+ ≤ +5.5 VDC , unless otherwise specified. Boldface limits apply for TA = TJ
= TMIN to TMAX; all other limits TA = TJ = 25°C.
Symbol
Parameter
Conditions
Min
(Note 9)
Typical
(Note 8)
Max
(Note 9)
Units
100
µs
SERIAL BUS TIMING CHARACTERISTICS
t1
SCL (Clock) Period
2.5
t2
Data In Setup Time to SCL High
100
ns
t3
Data Out Stable After SCL Low
0
ns
t4
SDA Low Setup Time to SCL Low (start)
100
ns
t5
SDA High Hold Time After SCL High (stop)
100
ns
tTIMEOUT
SCL or SDA time low for
I2C
bus reset
25
35
ms
30096326
FIGURE 1. Serial Bus Timing Diagram
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: All voltages are measured with respect to GND, unless otherwise specified.
Note 3: If the input voltage at any pin exceeds the power supply ( that is, VIN < GND or VIN > V +) but is less than the absolute maximum ratings, then the current
at that pin should be limited to 5mA. The 30 mA maximum package input current rating limits the number of pins that can safely exceed the power supply with
an input current of 5mA to six pins. Parasitic components and/or ESD protection circuitry are shown in the Pin Descriptions table.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA and the ambient temperature, TA. The maximum
allowable power dissipation at any temperature is PD = (TJMAX − T A) / θJA.
Note 5: For the given θJA, the device is on a 2-layer printed circuit board with 1 oz. copper foil and no airflow.
Note 6: Human body model (HBM) is a charged 100pF capacitor discharged into a 1.5kΩ resistor. Machine model (MM) is a charged 200pF capacitor discharged
directly into each pin. Charged Device Model (CDM) simulates a pin slowly acquiring charge (such as from a device sliding down the feeder in an automated
assembler) then rapidly being discharged.
Note 7: Each input and output is protected by an ESD structure to GND, as shown in the Pin Descriptions table. Input voltage magnitude up to 0.3V above V+ or
0.3V below GND will not damage the ADC128D818. There are diodes that exist between some inputs and the power supply rails. Errors in the ADC conversion
can occur if these diodes are forward biased by more than 50mV. As an example, if V+ is 4.50 VDC, INx (where 0 ≤ x ≤ 7) must be ≤ 4.55 VDC to ensure accurate
conversions.
Note 8: Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
Note 9: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
Note 10: Limit is guaranteed by characterization.
Note 11: TUE (Total Unadjusted Error) includes Offset, Gain and Linearity errors of the ADC.
Note 12: The range is up to 7/8 of full scale.
Note 13: Limit is guaranteed by design.
Note 14: Timing specifications are tested at the Serial Bus Input logic levels: VIN(0) = 0.3 × V+ for a falling edge and VIN(1) = 0.7 × V+ for a rising edge if the SCL
and SDA edge rates are similar.
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The following typical performance plots apply for the
internal VREF = 2.56V, V+ = 3.3V, Pseudo-Differential connection, unless otherwise specified. Boldface limits apply for TA =
TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. (Note 14)
TUE vs. Code
TUE vs. Code (External VREF = 1.25V)
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30096347
TUE vs. Code (External VREF = 2.56V)
TUE vs. Code (External VREF = 5V, V+ = 5V)
30096348
30096349
INL vs. Code (External VREF = 1.25V for 1 Unit)
INL vs. Code (External VREF = 1.25V for 28 Units)
30096350
30096371
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ADC128D818
14.0 Typical Performance Characteristics
ADC128D818
INL vs. Code (External VREF = 2.56V for 1 Unit)
INL vs. Code (External VREF = 2.56V for 28 Units)
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30096372
INL vs. Code (External VREF = 5V, V+ = 5V for 1 Unit)
INL vs. Code (External VREF = 5V, V+ = 5V for 28 Units)
30096352
30096373
DNL vs. Code (External VREF = 2.56V for 1 Unit)
DNL vs. Code (External VREF = 2.56V for 28 Units)
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30096355
10
ADC128D818
Offset Error vs. V+
Offset Error vs. Temperature
30096356
30096358
Gain Error vs. V+
Gain Error vs. Temperature
30096360
30096362
I+ vs. Temperature
I+ vs. V+ Typical
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30096365
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ADC128D818
I+ vs. V+ for Voltage Conversion
I+ vs. V+ for Temperature Conversion
30096367
30096366
I+ vs. V+ in Shutdown Mode
I+ vs. V+ in Deep Shutdown Mode
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30096369
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15.1 GENERAL DESCRIPTION
The ADC128D818 provides 8 analog inputs, a temperature
sensor, a delta-sigma ADC, an external or internal VREF option, and WATCHDOG registers on a single chip. An I2C
Serial Bus interface is also provided. The ADC128D818 can
perform voltage and temperature monitoring for a variety of
systems.
The ADC128D818 continuously converts the voltage input to
12-bit resolution with an internal VREF of 0.625mV LSb
(Least Significant bit) weighting, yielding input range of 0V to
2.56V. There is also an external VREF option that ranges from
1.25V to V+. The analog inputs are intended to be connected
to several power supplies present in a variety of systems.
Eight inputs can be configured for single-ended and/or pseudo-differential channels. Temperature can be converted to a
9-bit two's complement word with resolutions of 0.5°C per
LSb.
The ADC128D818 provides a number of internal registers.
These registers are summarized in the "ADC128D818 Internal Registers" section.
The ADC128D818 supports Standard Mode (Sm, 100kbits/s)
and Fast Mode (Fm, 400kbits/s) I2C interface modes of operation. ADC128D818 includes an analog filter on the I2C
digital control lines that allows improved noise immunity. The
device also supports TIMEOUT reset function on SDA and
SCL to prevent I2C bus lock-up. Two tri-level address pins
allow up to 9 devices on a single I2C bus.
At start-up, ADC128D818 cycles through each measurement
in sequence and continuously loops through the sequence
based on the Conversion Rate Register (address 07h) setting. Each measured value is compared to values stored in
the Limit Registers (addresses 2Ah - 39h). When the measured value violates the programmed limit, the ADC128D818
will set a corresponding interrupt bit in the Interrupt Status
Registers (address 01h). An interrupt output pin, INT, is also
available and fully programmable.
15.4 ANALOG INPUTS (IN0 - IN7)
The ADC128D818 allows up to 8 single-ended inputs or 4
pseudo-differential inputs as selected by the modes of operation. The input types are described in the next subsections.
15.4.1 Single-Ended Input
ADC128D818 allows a maximum of 8 single-ended inputs,
where the source's voltage is connected to INx (0 ≤ x ≤ 7).
The source’s ground should be connected to ADC128D818’s
GND pin. In theory, INx can be of any value between 0V and
(VREF-3LSb/2), where LSb = VREF/212.
To use the device single-endedly, refer to the "Modes of Operation" section and to bits [2:1] of the Advanced Configuration Register (address 0Bh). Figure 2 shows the appropriate
configuration for a single-ended connection.
30096331
FIGURE 2. Single-Ended Configuration
15.4.2 Pseudo-Differential Input
Pseudo-differential mode is defined as the positive input voltage applied differentially to the ADC128D818, as shown in
Figure 3. The input that is digitized is (ΔVIN = IN+ - IN-), where
(IN+ - IN-) is (IN0-IN1), (IN3-IN2), (IN4-IN5), or (IN7-IN6). Be
aware of this input configuration because the order is
swapped. In theory, ΔVIN can be of any value between 0V
and (VREF-3LSb/2),where LSb = VREF/212.
By using this pseudo-differential input, small signals common
to both inputs are rejected. Thus, operation with a pseudodifferential input signal will provide better performance than
with a single-ended input. Refer to the "Modes of Operation"
section for more information.
15.2 SUPPLY VOLTAGE (V+)
The ADC128D818 operates with a supply voltage, V+, that
has a range between +3.0V to +5.5V. Care must be taken to
bypass this pin with a parallel combination of 1 µF (electrolytic
or tantalum) capacitor and 0.1 µF (ceramic) bypass capacitor.
15.3 VOLTAGE REFERENCES (VREF)
The reference voltage (VREF) sets the analog input range.
The ADC128D818 has two options for setting VREF. The first
option is to use the internal VREF, which is equal to 2.56V.
The second option is to source VREF externally via pin 1 of
ADC128D818. In this case, the external VREF will operate in
the range of 1.25V to V+. The default VREF selection is the
internal VREF. If the external VREF is preferred, use the Advanced Configuration Register (address 0Bh) to change this
setting.
VREF source must have a low output impedance and needs
to be bypassed with a minimum capacitor value of 0.1 µF. A
larger capacitor value of 1 µF placed in parallel with the
0.1 µF is preferred. VREF of the ADC128D818, like all ADC
converters, does not reject noise or voltage variations. Keep
this in mind if VREF is derived from the power supply. Any
noise and/or ripple from the supply that is not rejected by the
external reference circuitry will appear in the digital results.
30096332
FIGURE 3. Pseudo-Differential Configuration
13
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ADC128D818
The use of a reference source is recommended. The LM4040
and LM4050 shunt reference families as well as the LM4120
and LM4140 series reference families are excellent choices
for a reference source.
15.0 Functional Description
ADC128D818
the Advanced Configuration Register (address 0Bh, bits
[2:1]).
15.4.3 Modes of Operation
ADC128D818 allows 4 modes of operation, as summarized
in the following table. Set the desired mode of operation using
TABLE 3. Modes of Operation
Ch.
Mode 0
Mode 1
Mode 2
Mode 3
1
IN0
IN0
IN0 (+) &
IN1 (-)
IN0
2
IN1
IN1
IN3 (+) &
IN2 (-)
IN1
IN2
IN4 (+) &
IN5 (-)
IN2
IN3
IN7 (+) &
IN6 (-)
3
4
IN2
IN3
IN3
5
IN4
IN4
IN4 (+) &
IN5 (-)
6
IN5
IN5
IN7 (+) &
IN6 (-)
7
IN6
IN6
8
nc*
IN7
Local
Temp
Yes
No
Yes
Yes
* nc = No Connect
the pseudo-differential configuration. In theory, ΔVIN can be
of any value between 0V and (VREF-3LSb/2). Any ΔVIN value outside of this range will produce a digital output code of
0 or 4095. Figure 4 shows a theoretical plot of DOUT vs. ΔVIN
and some sample DOUT calculation using the equation above.
15.5 DIGITAL OUTPUT (DOUT)
The digital output code for a 12-bit ADC can be calculated as:
DOUT = [ΔVIN / VREF] x 212
For the above equation, ΔVIN = INx - GND, where 0 ≤ x ≤ 7,
for the single-ended configuration, and ΔVIN = (IN+ - IN-) for
30096333
FIGURE 4. DOUT vs ΔVIN for a 12-bit ADC assuming VREF = 2.56V.
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30096345
FIGURE 5. I+ Equation
Where "a" is the number of local temperature available, and
"b" is the number of ENABLED voltage channel. Each mode
of operation has a different "a" and "b" values. The following
table shows the value for "a" and the maximum value for "b"
for each mode.
TABLE 4. "a" and "b" Values
15
a
b (Max)
Mode 0
1
7
Mode 1
0
8
Mode 2
1
4
Mode 3
1
6
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ADC128D818
15.6 POWER MANAGEMENT
To understand the average supply current (I+), the conversion
rates must be introduced. ADC128D818 has three types of
conversion rates: Continuous Conversion Mode, Low Power
Conversion Mode, and One Shot Mode. In the Low Power
Conversion Mode, the device converts all of the enabled
channels then enters shutdown mode; this process takes approximately 728 ms to complete. (More information on the
conversion rate will be discussed in the "Conversion Rate
Register (address 07h)" and "One-Shot Register (address
09h)" sections).
Each type of conversion produces a different average supply
current. The supply current for a voltage conversion will be
referred to as I+_VOLTAGE, a temperature conversion as
I+_TEMP, and the shutdown mode as I+_SHUTDOWN.
These values can be obtained from Typical Performance
Characteristics plots.
In general, I+ is the average supply current while
ADC128D818 is operating in the Low Power Conversion
Mode with all of the available channels enabled. Its plot can
be seen in the "Typical Performance Characteristic" section
and its equation is shown below.
ADC128D818
I2C bus. Examples to set each address bit low, high, or to
midscale can be found in the "Example Applications" section.
The Serial Bus Address can be set as follows:
15.7 INTERFACE
The Serial Bus control lines include the SDA (serial data),
SCL (serial clock), and A0-A1 (Serial Bus Address) pins. The
ADC128D818 can only operate as a slave. The SCL line only
controls the serial interface, and all of other clock functions
within ADC128D818 are done with a separate asynchronous
internal clock.
When the Serial Bus Interface is used, a write will always
consists of the ADC128D818 Serial Bus Address byte, followed by the Register Address byte, then the Data byte.
Figure 6 and Figure 7 are two examples showing how to write
to the ADC128D818.
There are two cases for a read:
1. If the Register Address is known to be at the desired
address, simply read the ADC128D818 with the Serial
Bus Address byte, followed by the Data byte read from
the ADC128D818. Examples of this type of read can be
seen in Figure 8 and Figure 9.
2. If the Register Address value is unknown, write to the
ADC128D818 with the Serial Bus Address byte, followed
by the desired Register Address byte. Then restart the
Serial Communication with a Read consisting of the
Serial Bus Address byte, followed by the Data byte read
from the ADC128D818. See Figure 10 and Figure 11 for
examples of this type of read.
The Serial Bus Address can be found in the next section, and
the Register Address can be found in the "Register Map" section. For more information on the I2C Interface, refer to NXP's
"I2C-Bus Specification and User Manual", rev. 03.
TABLE 5. Serial Bus Address Table
Serial Bus
Address
Serial Bus
[A6][A5][A4]...[A0] Address (hex)
A1
A0
LOW
LOW
001_1101b
1Dh
LOW
MID
001_1110b
1Eh
LOW
HIGH
001_1111b
1Fh
MID
LOW
010_1101b
2Dh
MID
MID
010_1110b
2Eh
MID
HIGH
010_1111b
2Fh
HIGH
LOW
011_0101b
35h
HIGH
MID
011_0110b
36h
HIGH
HIGH
011_0111b
37h
15.7.2 Timeout
The ADC128D818 I2C state machine resets to its idle state if
either SCL or SDA is held low for longer than 35ms. This feature also ensures that ADC128D818 will automatically release SDA after driving it low continuously for 25-35ms, hence
preventing I2C bus lock-up. The TIMEOUT feature should not
be used when the device is operating in deep shutdown
mode.
15.7.1 Serial Bus Address
There are nine different configurations for the ADC128D818
Serial Bus Address, thus nine devices are allowed on a single
15.7.3 Example Writes and Reads
30096309
FIGURE 6. Serial Bus Interface Write Example 1 - Internal Address Register Set Only.
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16
ADC128D818
30096308
FIGURE 7. Serial Bus Interface Write Example 2 - Internal Address Register Set with Data Byte Write.
30096310
FIGURE 8. Serial Bus Interface Read Example 1 - Single Byte Read with Preset Internal Address Register.
30096322
FIGURE 9. Serial Bus Interface Read Example 2 - Double Byte Read with Preset Internal Address Register.
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ADC128D818
30096324
FIGURE 10. Serial Bus Interface Read Example 3 - Single Byte Read with Internal Address Set using a Repeat Start.
30096323
FIGURE 11. Serial Bus Interface Read Example 4 - Double Byte Read with Internal Address Set using a Repeat Start.
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18
ADC128D818
15.8 USING THE ADC128D818
15.8.1 ADC128D818 Internal Registers
TABLE 6. ADC128D818 Internal Registers
Register Name
Configuration Register
Read/
Write
Register
Address
(hex)
Default Value
[7:0]
R/W
00h
0000_1000
Provides control and configuration
8-bit
8-bit
Register Description
Register
Format
Interrupt Status Register
R
01h
0000_0000
Provides status of each WATCHDOG limit or
interrupt event
Interrupt Mask Register
R/W
03h
0000_0000
Masks the interrupt status from propagating to INT
8-bit
Conversion Rate Register
R/W
07h
0000_0000
Controls the conversion rate
8-bit
8-bit
Channel Disable Register
One-Shot Register
Deep Shutdown Register
Advanced Configuration
Register
R/W
08h
0000_0000
Disables conversion for each voltage or temperature
channel
W
09h
0000_0000
Initiates a single conversion of all enabled channels
8-bit
R/W
0Ah
0000_0000
Enables deep shutdown mode
8-bit
8-bit
R/W
0Bh
0000_0000
Selects internal or external VREF and modes of
operation
Busy Status Register
R
0Ch
0000_0010
Reflects the ADC128D818 'Busy' and 'Not Ready'
statuses
8-bit
Channel Readings
Registers
R
20h - 27h
---
Report channels (voltage or temperature) readings
16-bit
R/W
2Ah - 39h
---
Set the limits for the voltage and temperature
channels
8-bit
Manufacturer ID Register
R
3Eh
0000_0001
Reports the manufacturer's ID
8-bit
Revision ID Register
R
3Fh
0000_1001
Reports the revision's ID
8-bit
Limit Registers
the registers to their default values. These default values are
shown in the table above or in the "Register Map" section.
Registers whose default values are not shown have power on
conditions that are indeterminate.
15.8.2 Quick Start
1. Power on the device, then wait for at least 33ms.
2. Read the Busy Status Register (address 0Ch). If the 'Not
Ready' bit = 1, then increase the wait time until 'Not
Ready' bit = 0 before proceeding to the next step.
3. Program the Advanced Configuration Register (address
0Bh):
a. Choose to use the internal or external VREF (bit 0).
b. Choose the mode of operation (bits [2:1]).
4. Program the Conversion Rate Register (address 07h).
5. Choose to enable or disable the channels using the
Channel Disable Register (address 08h).
6. Using the Interrupt Mask Register (address 03h), choose
to mask or not to mask the interrupt status from
propagating to the interrupt output pin, INT.
7. Program the Limit Registers (addresses 2Ah – 39h).
8. Set the ‘START’ bit of the Configuration Register
(address 00h, bit 0) to 1.
9. Set the 'INT_Clear' bit (address 00h, bit 3) to 0. If needed,
program the 'INT_Enable' bit (address 00h, bit 1) to 1 to
enable the INT output.
The ADC128D818 then performs a round-robin monitoring of
enabled voltage and temperature channels. The sequence of
items being monitored corresponds to locations in the Channel Readings Registers (except for the temperature reading).
Detailed descriptions of the register map can be found at the
end of this datasheet.
15.8.4 Configuration Register (address 00h)
The Configuration Register (address 00h) provides all control
to the ADC128D818. After POR, the 'START' bit (bit 0) is set
low and the 'INT_Clear' bit (bit 3) is set high.
The Configuration Register has the ability to start and stop the
ADC128D818, enable and disable the INT output, and set the
registers to their default values.
• Bit 0, ‘START’, controls the monitoring loop of the
ADC128D818. After POR, set this bit high to start
conversion. Setting this bit low stops the ADC128D818
monitoring loop and puts the ADC128D818 in shutdown
mode; thus, reducing power consumption. Even though
this bit is set low, serial bus communication is possible with
any register in the ADC128D818.
After an interrupt occurs, the INT pin will not be cleared if
the user sets this bit low.
• Bit 1, 'INT_Enable', enables the interrupt output pin, INT,
when this bit is set high.
• Bit 3, 'INT_Clear', clears the interrupt output pin, INT,
when this bit is set high. When this bit is set high, the
ADC128D818 monitoring function will stop. The content of
the Interrupt Status Register (address 01h) will not be
affected.
• Bit 7, ‘INITIALIZATION’, accomplishes the same function
as POR, that is, it initializes some of the registers to their
default values. This bit automatically clears after being set
high. Setting this bit high, however, does not reset the
Channel Readings Registers (addresses 20h - 27h) and
15.8.3 Power On Reset (POR)
When power is first applied, the ADC128D818 performs a
power on reset (POR) on several of its registers, which sets
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ADC128D818
the Limit Registers (addresses 2Ah - 39h). These registers
will be indeterminate immediately after power on. If the
Channel Readings Registers contain valid conversion
results and/or the Limit Registers have been previously
set, they will not be affected by this bit.
15.8.8 One-Shot Register (address 09h)
The One-Shot register is used to initiate a single conversion
and comparison cycle when the device is in shutdown mode
or deep shutdown mode, after which the device returns to the
respective mode it was in. The obvious advantage of using
this mode is lower power consumption because the device is
operating in shutdown or deep shutdown mode.
This register is not a data register, and it is the write operation
that causes the one-shot conversion. The data written to this
address is irrelevant and is not stored. A zero will always be
read from this register.
15.8.5 Interrupt Status Register (address 01h)
Each bit in this read-only register indicates whether the voltage reading > the voltage high limit or ≤ the voltage low limit,
or the temperature reading > the temperature high limit. For
example, if "IN0 High Limit" register (address 2Ah) were set
to 2V and if IN0 reading (address 20h) were 2.56V, then bit
'IN0 Error' would be 1, indicating that the voltage high limit has
been exceeded.
15.8.9 Deep Shutdown Register (address 0Ah)
The ADC128D818 can be placed in deep shutdown mode,
thus reducing more power consumption. The procedures for
deep shutdown entrance are:
1. Enter shutdown by setting the ‘START’ bit of the
“Configuration Register’ (address 00h, bit 0) to 0.
2. Enter deep shutdown by setting the ‘DEEP SHUTDOWN’
bit (address 0Ah, bit 0) to 1.
3. A one-shot conversion can be triggered by writing any
values to register address 09h.
Deep Shutdown Exit Procedure:
1. Set the ‘DEEP SHUTDOWN’ bit to 0.
15.8.6 Interrupt Mask Register (address 03h)
This register masks the interrupt status from propagating to
the interrupt output pin, INT. For example, if bit 'IN0 Mask' =
1, then the interrupt output pin, INT, would not be pulled low
even if an error event occurs at IN0.
15.8.7 Conversion Rate Register (address 07h)
There are three options for controlling the conversion rate.
The first option is called the Low Power Conversion Mode,
where the device converts all of the enabled channels then
enters shutdown mode. This process takes approximately
728 ms to complete.
The second option is the Continuous Conversion Mode,
where the device continuously converts the enabled channels, thus never entering shutdown mode. A voltage conversion takes 12.2 ms, and a temperature conversion takes 3.6
ms. For example, if operating in mode 2 and three voltage
channels were enabled, then each round-robin monitor would
take 40.2 ms (3 x 12.2ms + 3.6ms) to complete. Use the
"Channel Disable Register" (address 08h) to disable the desired channel(s).
The third option is called the On-Shot mode, which will be
discussed in the next subsection.
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15.8.10 Channel Readings Registers (addresses 20h 27h)
The channel conversion readings are available in registers
20h to 27h. Each register is 16-bit wide to accommodate the
12-bit voltage reading or 9-bit temperature reading. Conversions can be read at any time and will provide the result of the
last conversion. If a conversion is in progress while a communication is started, that conversion will be completed, and
the Channel Reading Registers will not be updated until the
communication is complete.
20
30096320
(Non-Linear Scale for Clarity)
FIGURE 12. 9-bit Temperature-to-Digital Transfer Function
Binary [MSb...LSb]
Decimal
Hex
+125°C
0 _1111_1010
250
0_FA
+25°C
0_0011_0010
50
0_32
+0.5°C
0_0000_0001
1
0_01
+0°C
0_0000_0000
0
0_00
> Thot, an interrupt occurs. How this interrupt occurs will be
explained in the "Temperature Interrupt" section.
Each temperature limit is represented by an 8-bit, two's complement word with an LSb (Least Significant bit) equal to
1°C. The table below shows some sample temperatures that
can be programmed to the Temperature Limit Registers.
In general, use the following equations to calculate the digital
code that represents the desired temperature limit:
−0.5°C
1_1111_1111
511
1_FF
If Temp Limit (°C) >= 0: Digital Code (dec) = Temp Limit(°C)
−25°C
1_1100_1110
462
1_CE
−40°C
1_1011_0000
432
1_B0
If Temp Limit (°C) < 0: Digital Code (dec) = 28 - |Temp Limit
(°C)|
Temp
Digital Output (DOUT)
In general, the easiest way to calculate the temperature (°C)
is to use the following formulas:
Temp Limit
If DOUT[MSb] = 0: +Temp(°C) = DOUT(dec) / 2
Digital Code
Binary [MSb...LSb]
Decimal
Hex
+125°C
0111_1101
125
7D
If DOUT[MSb] = 1: –Temp(°C) = [29 - DOUT(dec)] / 2
+25°C
0001_1001
25
19
15.9.1 Temperature Limits
One of the ADC128D818 features is monitoring the temperature reading. This monitoring is accomplished by setting a
temperature limit to the Temperature High Limit Register
(Thot , address 38h) and Temperature Hysteresis Limit Register (Thot_hyst, address 39h). When the temperature reading
+1.0°C
0000_0001
1
01
+0°C
0000_0000
0
00
−1.0°C
1111_1111
255
FF
−25°C
1110_1111
231
E7
−40°C
1101_1000
216
D8
21
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ADC128D818
27h). This register is 16-bit wide, and thus, all 9 bits of the
temperature reading can be read using a double byte read
(Figure 9 or Figure 11). The following figure and the table below it show the theoretical output code (DOUT) vs. temperature
and some typical temperature-to-code conversions.
15.9 TEMPERATURE MEASUREMENT SYSTEM
The ADC128D818 delta-VBE type temperature sensor and
delta-sigma ADC perform 9-bit two's-complement conversions of the temperature. This temperature reading can be
obtained at the Temperature Reading Register (address
ADC128D818
15.10 INTERRUPT STRUCTURE
30096318
FIGURE 13. Interrupt Structure
Figure 13 shows the ADC128D818's Interrupt Structure. Note
that the number next to each bit name represents its register
address and bit number. For example, 'INT_Clear' (00h[3])
refers to bit 3 of register address 00h.
Another method to clear the interrupt output pin, INT, is setting
'INT_Clear' bit (address 00h, bit 3) = 1. When this bit is high,
the ADC128D818 round-robin monitoring loop will stop.
15.10.3 Temperature Interrupt
One of the ADC128D818 features is monitoring the temperature reading. This monitoring is accomplished by setting a
temperature limit to the Temperature High Limit Register
(Thot , address 38h) and Temperature Hysteresis Limit Register (Thot_hyst, address 39h). These limit registers have an
interrupt mode, shown in Figure 14, that operates the the following way: if the temperature reading > Thot, an interrupt will
occur and will remain active indefinitely until reset by reading
the Interrupt Status Register (address 01h) or cleared by the
'INT_Clear' bit.
Once an interrupt event has occurred by crossing Thot, then
reset, an interrupt will occur again once the next temperature
conversion has completed. The interrupts will continue to occur in this manner until the temperature reading is ≤ Thot_hyst
and a read of the Interrupt Status Register has occurred.
15.10.1 Interrupt Output (INT)
ADC128D818 generates an interrupt as a result of each of its
internal WATCHDOG registers on the voltage and temperature channels. In general, INT becomes active when all three
scenarios, as depicted in Figure 13, occur:
1. 'INT_Clear' (00h[3]) = 0.
2. 'INT_Enable' (00h[1]) = 1 to enable interrupt output.
3. The voltage reading > the voltage high limit or ≤ the
voltage low limit, or the temperature reading > Thot.
15.10.2 Interrupt Clearing
Reading the Interrupt Status Register (addresses 01h) will
output the contents of the register and clear the register.
When the Interrupt Status Register clears, the interrupt output
pin, INT, also clears until this register is updated by the roundrobin monitoring loop.
30096317
FIGURE 14. Temperature Response Structure
(Assuming the interrupt output pin, INT, is reset before the next temperature reading)
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22
ADC128D818
15.11 EXAMPLE APPLICATIONS
15.11.1 General Voltage Monitoring
30096341
FIGURE 15. Typical Analog Input Application
A typical application for ADC128D818 is voltage monitoring.
In this application, the inputs would most often be connected
to linear power supplies of 2.5V, 3.3V, ±5V and ±12V inputs.
These inputs should be attenuated with external resistors to
any desired value within the input range. The attenuation is
done with resistors R1 and R2 for the positive single-ended
voltage, and R3 and R4 for the positive pseudo-differential
voltage.
A typical single-ended application might select the input voltage divider to provide 1.9V at the analog input of the ADC128D818. This is sufficiently high for good resolution of the
voltage, yet leaves headroom for upward excursions from the
supply of about 25%. To simplify the process of resistor selection, set the value of R2 first. Select a value for R2 between
10 kOhm and 100 kOhm. This is low enough to avoid errors
due to input leakage currents yet high enough to protect both
the inputs under and overdrive conditions as well as minimize
loading of the source. Finally, calculate R1 to provide a 1.9V
input using simple voltage divider derived formula:
Care should be taken to bypass V+ with decoupling 0.1 µF
ceramic capacitor and 1 µF tantalum capacitor. If using the
external reference option, VREF should be connected to a
voltage reference, such as the LM4140, and should also be
decoupled to the ground plane by a 0.1 µF ceramic capacitor
and a 1 µF tantalum capacitor. For both supplies, the 0.1 µF
capacitor should be located as close as possible to the ADC128D818.
Since SDA, SCL, and INT are open-drain pins, they should
have external pull-up resistors to ensure that the bus is pulled
high until a master device or slave device sinks enough current to pull the bus low. A typical pull-up resistor, R, ranges
from 1.1 kOhm to 10 kOhm. Refer to NXP's "I2C-Bus Specification and User Manual" for more information on sizing R.
Because there are two tri-level address pins (A0 and A1), up
to 9 devices can share the same I2C bus. A trick to set these
serial addresses utilizes four GPO (general purpose output)
pins from the master device as shown in the example diagram. A table showing how to program these GPO pins can
be seen below.
R1 = [(VS1 - VIN2) / VIN2 ] x R2
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ADC128D818
TABLE 7. Setting Serial Bus Address using GPO
A1
A0
GPO1 GPO2 GPO3 GPO4
LOW
LOW
Z
LOW
Z
LOW
LOW
MID
Z
LOW
HIGH
LOW
LOW
HIGH
Z
LOW
HIGH
Z
MID
LOW
HIGH
LOW
Z
LOW
MID
MID
HIGH
LOW
HIGH
LOW
MID
HIGH
HIGH
LOW
HIGH
Z
HIGH
LOW
HIGH
Z
Z
LOW
HIGH
MID
HIGH
Z
HIGH
LOW
HIGH
HIGH
HIGH
Z
HIGH
Z
Z = high impedance
15.11.2 Voltage Monitoring for Power Supplies
30096342
FIGURE 16. Power Supply Application
Figure 16 shows a more complete systems application using
a DC/DC converter. Such configuration can be used in a power supply application. The point to make with this example
diagram is the Serial Bus Address connections. The previous
example shows A0 and A1 connected to four GPOs, but this
example shows a simpler A0 and A1 connection using two
resistor dividers. This connection accomplishes the same
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goal as the GPO connection, that is, it can set A0 and A1 high,
low, or to midscale.
For example, to set A0 high, don't populate RB_bottom; to set
A0 low, don't populate RB_top; and to set A0 to midscale,
leave RB_top and RB_bottom as is and set them equal to
each other. A typical RB value ranges from 1 kOhm to 10
kOhm.
24
ADC128D818
15.11.3 Temperature Sensors
30096343
FIGURE 17. Temperature Sensor Applications
An external temperature sensor can be connected to any of
ADC128D818's eight single-ended input for additional temperature sensing. One such temperature sensor can be
National's LM94022, a precision analog temperature sensor
with selectable gains. The application diagram shows
LM94022's gains (GS1 and GS0) both grounded indicating
the lowest gain setting. Four possible gains can be set using
these GS1 and GS0 pins.
According to the LM94022 datasheet, the voltage-to-temperature output plot can be determined using the method of linear
approximation as follows:
Where V is in mV, T is in °C, V1 and T1 are the coordinates
of the lowest temperature, and T2 and V2 are the coordinates
of the highest temperature.
For example, to determine the equation of a line over a temperature range of 20°C to 50°C, first find V1 and V2 relative
to those temperatures, then use the above equation to find
the transfer function.
V - 925 mV = (760 mV - 925 mV) / (50C - 20°C) x (T - 20°C)
V = (-5.50 mV /°C) x T + 1035 mV
For more information and explanation of this example, refer
to the LM94022 datasheet.
V - V1 = (V2 - V1) / (T2 - T1) x (T - T1)
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ADC128D818
15.11.4 Bridge Sensors
30096344
FIGURE 18. Bridge Sensor Application
ADC128D818 is perfect for transducer applications such as
pressure sensors. These sensors measure pressure of gases
or liquids and produce a pressure-equivalent voltage at their
outputs. Figure 18 shows a typical connection of a pressure
sensor, represented by the bridge sensor.
Most pressure sensor has a low sensitivity characteristic,
which means its output is typically in the millivolts range. Because of that reason, an op-amp, such as an instrumentation
amplifier, can be used for the gain stage.
The positive aspect of this configuration is its ratiometric connection. A ratiometric connection is when the ADC’s VREF
and GND are connected to the bridge sensor’s voltage refer-
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ences. With a ratiometric configuration, external VREF accuracy can be ignored.
15.11.5 Layout and Grounding
Analog inputs will provide best accuracy when referred to the
GND pin or a supply with low noise. A separate, lowimpedance ground plane for analog ground, which provides
a ground point for the voltage dividers and analog components, will provide best performance but is not mandatory.
Analog components such as voltage dividers should be located physically as close as possible to the ADC128D818.
26
ADC128D818
15.12 REGISTER MAP
15.12.1 ADC128D818 Internal Registers
TABLE 8. ADC128D818 Internal Registers
Register Name
Configuration Register
Read/
Write
Register
Address
(hex)
Default Value
[7:0]
R/W
00h
0000_1000
Provides control and configuration
8-bit
8-bit
Register
Format
Register Description
Interrupt Status Register
R
01h
0000_0000
Provides status of each WATCHDOG limit or
interrupt event
Interrupt Mask Register
R/W
03h
0000_0000
Masks the interrupt status from propagating
to INT
8-bit
Conversion Rate Register
R/W
07h
0000_0000
Controls the conversion rate
8-bit
8-bit
R/W
08h
0000_0000
Disables conversion for each voltage or
temperature channel
W
09h
0000_0000
Initiates a single conversion of all enabled
channels
8-bit
Deep Shutdown Register
R/W
0Ah
0000_0000
Enables deep shutdown mode
8-bit
Advanced Configuration
Register
R/W
0Bh
0000_0000
Selects internal or external VREF and modes
of operation
8-bit
Busy Status Register
R
0Ch
0000_0010
Reflects ADC128D818 'Busy' and 'Not
Ready' statuses
8-bit
Channel Readings Registers
R
20h - 27h
---
Report the channels (voltage or temperature)
readings
16-bit
R/W
2Ah - 39h
---
Set the limits for the voltage and temperature
channels
8-bit
Manufacturer ID Register
R
3Eh
0000_0001
Reports the manufacturer's ID
8-bit
Revision ID Register
R
3Fh
0000_1001
Reports the revision's ID
8-bit
Channel Disable Register
One-Shot Register
Limit Registers
15.12.2 Configuration Register — Address 00h
Default Value [7:0] = 0000_1000 binary
Bit
Bit Name
Read/Write
Bit(s) Description
ALL MODES
0
Start
Read/Write
0: ADC128D818 in shutdown mode
1: Enable startup of monitoring operations
1
INT_Enable
Read/Write
1: Enable the interrupt output pin, INT
2
Reserved
Read Only
3
INT_Clear
Read/Write
4
Reserved
Read Only
5
Reserved
Read Only
6
Reserved
Read Only
7
Initialization
Read/Write
1: Clear the interrupt output pin, INT, without affecting the contents of Interrupt Status
Registers. When this bit is set high, the device stops the round-robin monitoring loop.
1: Restore default values to the following registers: Configuration, Interrupt Status,
Interrupt Mask, Conversion Rate, Channel Disable, One-Shot, Deep Shutdown,
Advanced Configuration, Busy Status, Channel Readings, Limit, Manufacturer ID,
Revision ID. This bit clears itself
27
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ADC128D818
15.12.3 Interrupt Status Register — Address 01h
Default Value [7:0] = 0000_0000 binary
Bit
Bit Name
Read/Write
Bit(s) Description
0
IN0 Error
Read Only
1: A High or Low limit has been exceeded
1
IN1 Error
Read Only
1: A High or Low limit has been exceeded
2
IN2 Error
Read Only
1: A High or Low limit has been exceeded
3
IN3 Error
Read Only
1: A High or Low limit has been exceeded
4
IN4 Error
Read Only
1: A High or Low limit has been exceeded
5
IN5 Error
Read Only
1: A High or Low limit has been exceeded
6
IN6 Error
Read Only
1: A High or Low limit has been exceeded
7
Hot Temperature Error
Read Only
1: A High limit has been exceeded
0
IN0 Error
Read Only
1: A High or Low limit has been exceeded
1
IN1 Error
Read Only
1: A High or Low limit has been exceeded
2
IN2 Error
Read Only
1: A High or Low limit has been exceeded
3
IN3 Error
Read Only
1: A High or Low limit has been exceeded
4
IN4 Error
Read Only
1: A High or Low limit has been exceeded
5
IN5 Error
Read Only
1: A High or Low limit has been exceeded
6
IN6 Error
Read Only
1: A High or Low limit has been exceeded
7
IN7 Error
Read Only
1: A High or Low limit has been exceeded
0
IN0(+) & IN1(-) Error
Read Only
1: A High or Low limit has been exceeded
1
IN3(+) & IN2(-) Error
Read Only
1: A High or Low limit has been exceeded
2
IN4(+) & IN5(-) Error
Read Only
1: A High or Low limit has been exceeded
3
IN7(+) & IN6(-) Error
Read Only
1: A High or Low limit has been exceeded
4
Reserved
Read Only
5
Reserved
Read Only
6
Reserved
Read Only
7
Hot Temperature Error
Read Only
1: A High limit has been exceeded
0
IN0 Error
Read Only
1: A High or Low limit has been exceeded
1
IN1 Error
Read Only
1: A High or Low limit has been exceeded
2
IN2 Error
Read Only
1: A High or Low limit has been exceeded
3
IN3 Error
Read Only
1: A High or Low limit has been exceeded
4
IN4(+) & IN5(-) Error
Read Only
1: A High or Low limit has been exceeded
5
IN7(+) & IN6(-) Error
Read Only
1: A High or Low limit has been exceeded
6
Reserved
Read Only
7
Hot Temperature Error
Read Only
MODE 0
MODE 1
MODE 2
MODE 3
www.national.com
1: A High limit has been exceeded
28
ADC128D818
15.12.4 Interrupt Mask Register — Address 03h
Default Value [7:0] = 0000_0000 binary
Bit
Bit Name
Read/Write
Bit(s) Description
0
IN0 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
1
IN1 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
2
IN2 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
3
IN3 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
4
IN4 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
5
IN5 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
6
IN6 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
7
Temperature Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
0
IN0 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
1
IN1 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
2
IN2 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
3
IN3 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
4
IN4 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
5
IN5 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
6
IN6 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
7
IN7 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
0
IN0(+) & IN1(-) Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
1
IN3(+) & IN2(-) Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
2
IN4(+) & IN5(-) Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
3
IN7(+) & IN6(-) Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
4
Reserved
Read Only
5
Reserved
Read Only
6
Reserved
Read Only
7
Temperature Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
IN0 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
MODE 0
MODE 1
MODE 2
MODE 3
0
29
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ADC128D818
Bit
Bit Name
Read/Write
Bit(s) Description
1
IN1 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
2
IN2 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
3
IN3 Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
4
IN4(+) & IN5(-) Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
5
IN7(+) & IN6(-) Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
6
Reserved
Read Only
7
Temperature Mask
Read/Write
1: Mask the corresponding interrupt status from propagating to the interrupt
output pin, INT
15.12.5 Conversion Rate Register — Address 07h
Default Value [7:0] = 0000_0000 binary
Bit
0
1–7
Bit Name
Read/Write
Bit(s) Description
Conversion Rate
Read/Write
Controls the conversion rate:
0: Low Power Conversion Mode
1: Continuous Conversion Mode
Note: This register must only be programmed when the device is in shutdown
mode, that is, when the 'START' bit of the 'Configuration Register' (address 00h)
=0
Reserved
Read Only
www.national.com
30
Bit
Bit Name
Whenever this register is programmed, all of the values in
the Channel Reading Registers and Interrupt Status
Registers will return to their default values.
Read/Write
Bit(s) Description
MODE 0
0
IN0 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
1
IN1 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
2
IN2 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed
3
IN3 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
4
IN4 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
5
IN5 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
6
IN6 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
7
Temperature Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
0
IN0 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
1
IN1 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
2
IN2 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
3
IN3 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
4
IN4 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
5
IN5 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
6
IN6 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
7
IN7 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
0
IN0(+) & IN1(-) Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
1
IN3(+) & IN2(-) Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
2
IN4(+) & IN5(-) Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
3
IN7(+) & IN6(-) Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
4
Reserved
Read Only
5
Reserved
Read Only
6
Reserved
Read Only
7
Temperature Disable
Read/Write
MODE 1
MODE 2
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
31
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ADC128D818
•
15.12.6 Channel Disable Register — Address 08h
Default Value [7:0] = 0000_0000 binary
• This register must only be programmed when the device
is in shutdown mode, that is, when the ‘START’ bit of the
“Configuration Register’ (address 00h) = 0.
ADC128D818
Bit
Bit Name
Read/Write
Bit(s) Description
MODE 3
0
IN0 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
1
IN1 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
2
IN2 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
3
IN3 Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
4
IN4(+) & IN5(-) Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
5
IN7(+) & IN6(-) Disable
Read/Write
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
6
Reserved
Read Only
7
Temperature Disable
Read/Write
www.national.com
1: Conversions are skipped and disabled, value register reading will be 0, and
error events will be suppressed.
32
Bit
Bit Name
Read/Write
Bit(s) Description
0
One-Shot
Write Only
1: Initiate a single conversion and comparison cycle when the device is in
shutdown mode or deep shutdown mode, after which the device returns to the
respective mode that it was in
1–7
Reserved
Read Only
15.12.8 Deep Shutdown Register — Address 0Ah
Default Value [7:0] = 0000_0000 binary
Bit
0
1–7
Bit Name
Read/Write
Deep Shutdown Enable
Read/Write
Reserved
Read Only
Bit(s) Description
1: When 'START' = 0 (address 00h, bit 0), setting this bit high will place the
device in deep shutdown mode
and Interrupt Status Registers will return to their default values.
15.12.9 Advanced Configuration Register — Address 0Bh
Default Value [7:0] = 0000_0000 binary
Note: Whenever the Advanced Configuration Register is programmed, all of the values in the Channel Reading Registers
Bit
0
1
2
3–7
Bit Name
External Reference Enable
Mode Select [0]
Read/Write
Read/Write
Read/Write
Mode Select [1]
Reserved
Bit(s) Description
0: Selects the 2.56V internal VREF
1: Selects the variable external VREF
Mode Select [1]
Mode Select [0]
Mode
0
0
Mode 0
0
1
Mode 1
1
0
Mode 2
1
1
Mode 3
Read Only
15.12.10 Busy Status Register — Address 0Ch
Default Value [7:0] = 0000_0010 binary
Bit
Bit Name
Read/Write
0
Busy
Read Only
1: ADC128D818 is converting
Bit(s) Description
1
Not Ready
Read Only
1: Waiting for the power-up sequence to end
2–7
Reserved
Read Only
33
www.national.com
ADC128D818
15.12.7 One-Shot Register — Address 09h
Default Value [7:0] = 0000_0000 binary
ADC128D818
15.12.11 Channel Readings Registers — Addresses
20h – 27h
Address
Register Name
Read/Write
Register Description
MODE 0
20h
IN0 Reading
Read Only
Reading for this perspective channel
21h
IN1 Reading
Read Only
Reading for this perspective channel
22h
IN2 Reading
Read Only
Reading for this perspective channel
23h
IN3 Reading
Read Only
Reading for this perspective channel
24h
IN4 Reading
Read Only
Reading for this perspective channel
25h
IN5 Reading
Read Only
Reading for this perspective channel
26h
IN6 Reading
Read Only
Reading for this perspective channel
27h
Temperature Reading
Read Only
Reading for this perspective channel
20h
IN0 Reading
Read Only
Reading for this perspective channel
21h
IN1 Reading
Read Only
Reading for this perspective channel
22h
IN2 Reading
Read Only
Reading for this perspective channel
23h
IN3 Reading
Read Only
Reading for this perspective channel
24h
IN4 Reading
Read Only
Reading for this perspective channel
25h
IN5 Reading
Read Only
Reading for this perspective channel
26h
IN6 Reading
Read Only
Reading for this perspective channel
27h
IN7 Reading
Read Only
Reading for this perspective channel
20h
IN0(+) & IN1(-) Reading
Read Only
Reading for this perspective channel
21h
IN3(+) & IN2(-) Reading
Read Only
Reading for this perspective channel
22h
IN4(+) & IN5(-) Reading
Read Only
Reading for this perspective channel
23h
IN7(+) & IN6(-) Reading
Read Only
Reading for this perspective channel
24h
Reserved
Read Only
25h
Reserved
Read Only
26h
Reserved
Read Only
27h
Temperature Reading
Read Only
Reading for this perspective channel
20h
IN0 Reading
Read Only
Reading for this perspective channel
21h
IN1 Reading
Read Only
Reading for this perspective channel
22h
IN2 Reading
Read Only
Reading for this perspective channel
23h
IN3 Reading
Read Only
Reading for this perspective channel
24h
IN4(+) & IN5(-) Reading
Read Only
Reading for this perspective channel
25h
IN7(+) & IN6(-) Reading
Read Only
Reading for this perspective channel
26h
Reserved
Read Only
27h
Temperature Reading
Read Only
MODE 1
MODE 2
MODE 3
www.national.com
Reading for this perspective channel
34
ADC128D818
15.12.12 Limit Registers — Addresses 2Ah – 39h
Address
Register Name
Read/
Register Description
MODE 0
2Ah
IN0 High Limit
Read/Write
High Limit
2Bh
IN0 Low Limit
Read/Write
Low Limit
2Ch
IN1 High Limit
Read/Write
High Limit
2Dh
IN1 Low Limit
Read/Write
Low Limit
2Eh
IN2 High Limit
Read/Write
High Limit
2Fh
IN2 Low Limit
Read/Write
Low Limit
30h
IN3 High Limit
Read/Write
High Limit
31h
IN3 Low Limit
Read/Write
Low Limit
32h
IN4 High Limit
Read/Write
High Limit
33h
IN4 Low Limit
Read/Write
Low Limit
34h
IN5 High Limit
Read/Write
High Limit
35h
IN5 Low Limit
Read/Write
Low Limit
36h
IN6 High Limit
Read/Write
High Limit
37h
IN6 Low Limit
Read/Write
Low Limit
38h
Temperature High Limit
Read/Write
High Limit
39h
Temperature Hysteresis Limit
Read/Write
Hysteresis Limit
2Ah
IN0 High Limit
Read/Write
High Limit
MODE 1
2Bh
IN0 Low Limit
Read/Write
Low Limit
2Ch
IN1 High Limit
Read/Write
High Limit
2Dh
IN1 Low Limit
Read/Write
Low Limit
2Eh
IN2 High Limit
Read/Write
High Limit
2Fh
IN2 Low Limit
Read/Write
Low Limit
30h
IN3 High Limit
Read/Write
High Limit
31h
IN3 Low Limit
Read/Write
Low Limit
32h
IN4 High Limit
Read/Write
High Limit
33h
IN4 Low Limit
Read/Write
Low Limit
34h
IN5 High Limit
Read/Write
High Limit
35h
IN5 Low Limit
Read/Write
Low Limit
36h
IN6 High Limit
Read/Write
High Limit
37h
IN6 Low Limit
Read/Write
Low Limit
38h
IN7 High Limit
Read/Write
High Limit
39h
IN7 Low Limit
Read/Write
Low Limit
2Ah
IN0(+) & IN1(-) High Limit
Read/Write
High Limit
MODE 2
2Bh
IN0(+) & IN1(-) Low Limit
Read/Write
Low Limit
2Ch
IN3(+) & IN2(-) High Limit
Read/Write
High Limit
2Dh
IN3(+) & IN2(-) Low Limit
Read/Write
Low Limit
2Eh
IN4(+) & IN5(-) High Limit
Read/Write
High Limit
2Fh
IN4(+) & IN5(-) Low Limit
Read/Write
Low Limit
30h
IN7(+) & IN6(-) High Limit
Read/Write
High Limit
31h
IN7(+) & IN6(-) Low Limit
Read/Write
Low Limit
32h
Reserved
Read Only
33h
Reserved
Read Only
34h
Reserved
Read Only
35h
Reserved
Read Only
36h
Reserved
Read Only
37h
Reserved
Read Only
35
www.national.com
ADC128D818
Address
Register Name
Read/
Register Description
38h
Temperature High Limit
Read/Write
High Limit
39h
Temperature Hysteresis Limit
Read/Write
Hysteresis Limit
2Ah
IN0 High Limit
Read/Write
High Limit
2Bh
IN0 Low Limit
Read/Write
Low Limit
2Ch
IN1 High Limit
Read/Write
High Limit
2Dh
IN1 Low Limit
Read/Write
Low Limit
2Eh
IN2 High Limit
Read/Write
High Limit
2Fh
IN2 Low Limit
Read/Write
Low Limit
30h
IN3 High Limit
Read/Write
High Limit
31h
IN3 Low Limit
Read/Write
Low Limit
32h
IN4(+) & IN5(-) High Limit
Read/Write
High Limit
33h
IN4(+) & IN5(-) Low Limit
Read/Write
Low Limit
34h
IN7(+) & IN6(-) High Limit
Read/Write
High Limit
35h
IN7(+) & IN6(-) Low Limit
Read/Write
Low Limit
36h
Reserved
Read Only
37h
Reserved
Read Only
38h
Temperature High Limit
Read/Write
High Limit
39h
Temperature Hysteresis Limit
Read/Write
Hysteresis Limit
MODE 3
15.12.13 Manufacturer ID Register — Address 3Eh
Default Value [7:0] = 0000_0001 binary
Address
Register Name
Read/Write
3Eh
Manufacturer ID
Read Only
Register Description
Manufacturer's ID always defaults to 0000_0001.
15.12.14 Revision ID Register — Addresses 3Fh
Default Value [7:0] = 0000_1001 binary
Address
3Fh
www.national.com
Register Name
Read/Write
Revision ID
Read Only
Register Description
Revision's ID always defaults to 0000_1001.
36
ADC128D818
16.0 Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Molded Plastic TSSOP
Order Number ADC128D818CIMT or ADC128D818CIMTX
NS Package Number MO-153
37
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ADC128D818 12-Bit, 8-Channel, ADC System Monitor with Temperature Sensor, Internal/
External Reference, and I2C Interface
Notes
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