MAX34407EWE+T [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, PBGA16, WLP-16;
| 型号： | MAX34407EWE+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PBGA16, WLP-16 |
| 文件： | 总17页 (文件大小：349K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
General Description
Features and Benefits
The MAX34407 is a current and voltage monitor that
is specialized for determining power consumption. The
device has a wide dynamic range to allow it to accurately
measure power in systems that consume small to large
amounts of power. The device is configured and moni-
● Enables Code Optimization to Minimize Power
Consumption in Portable Platforms
• Four Power Monitors with Wide 66dB Dynamic
Range
• Measures Both Current and Voltage
• Low Power Consumption
2
tored with a standard I C/SMBus serial interface. The
• Slow Mode for Reduced Power Consumption
• Power-Down Mode
unidirectional current sensor offers precision high-side
operation with a low full-scale sense voltage. The device
automatically collects the current-sense and voltage
samples. The samples are then multiplied to obtain a
power value and the power values are then accumulated.
Upon a command from the host, the device transfers the
accumulated power samples as well as the accumulation
count to a set of registers that the host can access. This
transfer occurs without missing a sample and allows the
host to retrieve the data not in real time, but at any time
interval.
● Minimizes Processor Overhead with Autonomous
Operation
• Per Channel 48-Bit Power Accumulators Capture
17 Minutes of Data at 1024 Samples per Second
• Per Channel 12-Bit Voltage Registers
● High-Integration Solution Minimizes Parts Count,
PCB Space, and BOM Cost
• Wide Current Common-Mode Range of 2.5V to 15V
• Low Full-Scale, Current-Sense Voltage of 100mV
2
• I C/SMBus Interface
Applications
● Tablets
● Ultra Notebooks
● Smartphones
• Temperature Range: -40°C to +85°C
• Small, 2.285mm x 2.185mm Footprint WLP Package
with 16 Bumps at 0.5mm Pitch
● Ease of Development
• Evaluation Kit with Advanced GUI Available
(MAX34407EVKIT#)
• Windows Driver Available
Ordering Information appears at end of data sheet.
19-7431; Rev 1; 7/17
MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Typical Application Circuit and Block Diagram
2.7V TO 3.6V
AUTOMATIC
OSCILLATOR
SEQUENCING
V
DD
POWER
CONTROL
CHANNEL 4
GND
V
REF
CURRENT
FLOW
CHANNEL 3
CHANNEL 2
CHANNEL 1
CURRENT
(16 BIT)
POWER
RESULT
(28 BIT)
ADC
(12 BIT)
IN+
IN-
VOLTAGE
(12 BIT)
R
SENSE
POWER
X1/X16
ACCUMULATOR
(48 BIT)
1.6V TO 3.6V
V
IO
REGISTERS
MAX34407
SCL
SDA
DIGITAL
CONTROL
INTERFACE
PDN
SMBUS
INTERFACE
SLOW
ADDR
R
ADDR
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Absolute Maximum Ratings
IN+ and IN- to GND...............................................-0.3V to +16V
Differential Input Voltage, IN+ to IN- ...................................±16V
Operating Temperature Range........................... -40°C to +85°C
Storage Temperature Range............................ -55°C to +125°C
Soldering Temperature................................ See the IPC/JEDEC
J-STD-020A Specification
V
or V to GND .................................................-0.3V to +4V
IO
DD
SDA or SCL to GND................................................-0.3V to +4V
All Other Pins ..............-0.3V to V + 0.3V (not to exceed +4V)
IO
(Note 1)
Package Thermal Characteristics
WLP
Junction-to-Ambient Thermal Resistance (θ ) ..........49°C/W
JA
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
= 2.7V to 3.6V, V = 1.6V to 3.6V, T = -40°C to +85°C, unless otherwise noted. Typical values are T = +25°C.)
DD
IO
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
3.6
450
4
UNITS
V
V
Operating Range
2.7
DD
DD
PDN = V and SLOW = GND
300
2.4
0.7
µA
µA
µA
V
IO
V
Average Supply Current
I
PDN = V and SLOW = V
DD
IO
IO
(Note 2)
PDN = GND
2
V
V
Operating Range
1.6
2.5
3.6
IO
IO
Average Supply Current
I
0.2
1
µA
V
IO
(Note 2)
Common-Mode Voltage Range
(Note 3)
V
15
CM
PDN = GND or SLOW = V
1
IO
V
= 2.5V and V
= 0mV
CM
SENSE
3.1
IN+ Average Input Bias Current
(Note 3)
PDN = V and SLOW = GND
µA
IO
V
= 1.5V and V
= 0mV
CM
SENSE
4.8
PDN = V and SLOW = GND
IO
SLOW = GND
1024
8
sps
sps
sps
sps
Bits
Bits
mV
V
Per Channel Current and Voltage
Sample Rate
SLOW = V
IO
SLOW = GND
SLOW = V
1024
8
Per Channel Power Calculation
Rate
IO
Current Sample Resolution
Voltage Sample Resolution
Current-Sense Full Scale
Voltage-Sense Full Scale
V
< 4mV
16
SENSE
12
100
16
V
V
V
V
V
= 97mV
= 10mV
= 1mV
±0.8
±1
SENSE
SENSE
SENSE
SENSE
SENSE
Power-Measurement Accumulation
Accuracy (1 Sigma Error Range
with > 1000 Accumulations)
(Note 4)
±1.5
±8
%
= 100µV
= 50µV
±15
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Electrical Characteristics (continued)
(V
= 2.7V to 3.6V, V = 1.6V to 3.6V, T = -40°C to +85°C, unless otherwise noted. Typical values are T = +25°C.)
DD
IO
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Bandwidth
200
kHz
Input Logic-High
SCL/SDA/PDN/SLOW
0.75 x
V
V
V
IH
V
IO
Input Logic-Low
SCL/SDA/PDN/SLOW
0.25 x
V
IL
V
IO
SDA Output Logic-Low
SDA Output Leakage
SCL, SDA Leakage
SLOW, PDN Leakage
V
I
= 4mA
OL
0.4
±1
±5
±1
V
OL
µA
µA
µA
Measured from V
> 2.7V
DD
Power-Up Time
and V > 1.6V and PDN
650
µs
IO
deasserted to SMBus port active
Note 2: SMBus not active.
Note 3: Common-mode voltage applies to the IN+ and IN- pins.
Note 4: Not production tested; bench characterization data.
2
AC Electrical Characteristics: I C/SMBus Interface
(V = 1.6V to 3.6V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V = 3.3, T = +25°C.)
IO
A
IO
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCL Clock Frequency
f
10
400
kHz
SCL
Bus Free Time Between STOP and
START Conditions
t
1.3
µs
µs
BUF
Hold Time (Repeated) START
Condition
t
0.6
HD:STA
Low Period of SCL
High Period of SCL
t
1.3
0.6
0
µs
µs
ns
ns
ns
µs
ns
ns
µs
ns
LOW
t
HIGH
Receive
Transmit
Data Hold Time
t
HD:DAT
300
100
0.6
Data Set-Up Time
t
SU:DAT
Start Set-Up Time
t
SU:STA
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Set-Up Time
t
300
300
R
t
F
t
0.6
SU:STO
Noise Spike Reject
t
30
SP
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
2
I C/SMBus Timing
SDA
t
BUF
t
F
t
SP
t
HD:STA
t
LOW
SCL
t
t
HD:STA
HIGH
t
t
R
HD:STA
t
SU:STO
t
SU:DAT
t
HD:DAT
REPEATED
START
STOP
START
NOTE: TIMING IS REFERENCED TO V
AND V
.
IL(MAX)
IH(MIN)
Typical Operating Characteristics
(V
= V = 3.3V, T = +25°C, V
= 5V, V
= 1mV.)
DD
IO
A
CM
SENSE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. TEMPERATURE
POWER MEASUREMENT ERROR
vs. SUPPLY VOLTAGE
toc03
toc01
toc02
350
4.0
3.5
3.0
2.5
2.0
1.5
1.0
350
4.0
3.5
3.0
2.5
2.0
1.5
1.0
5.00%
4.00%
3.00%
2.00%
1.00%
0.00%
300
250
200
150
100
300
250
200
150
100
2.50
2.75
3.00
VDD (V)
3.25
3.50
3.75
-50 -30 -10
10
30
50
70
90
2.0
2.5
3.0
VDD (V)
3.5
4.0
TEMPERATURE (ºC)
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Typical Operating Characteristics (continued)
(V
= V = 3.3V, T = +25°C, V
= 5V, V
= 1mV.)
DD
IO
A
CM
SENSE
PERCENT OF POPULATION
vs. POWER MEASUREMENT ERROR
POWER MEASUREMENT ERROR
vs. TEMPERATURE
POWER MEASUREMENT ERROR
vs. COMMON-MODE VOLTAGE
toc06
toc04
30%
25%
20%
15%
10%
5%
toc05
5.00%
4.00%
3.00%
2.00%
1.00%
0.00%
5.00%
4.00%
3.00%
2.00%
1.00%
0.00%
0%
-50 -30 -10 10 30 50 70 90
TEMPERATURE (ºC)
2
6
10
14
18
COMMON MODE (V)
POWER MEASUREMENT ERROR
VOL
POWER MEASUREMENT ERROR
vs. VSENSE VOLTAGE
vs. IOL
SDA PIN
toc07
toc08
80%
70%
60%
50%
40%
30%
20%
10%
0%
700
600
500
400
300
200
100
0
0.00001
0.0001
0.001
0.01
0.1
0
5
10 15 20 25 30 35 40 45 50
IOL (mA)
VSENSE VOLTAGE (V)
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Pin Configuration
TOP VIEW
MAX34407
1
2
3
4
+
A
IN2+
IN2-
IN3-
IN3+
IN1-
IN1+
V
DD
B
C
D
GND
SCL
SDA
V
IO
PDN
SLOW
IN4+
ADDR
IN4-
16 WLP
Pin Description
PIN
NAME
FUNCTION
External-Sense Resistor Power-Side Connection for Current-Sense Amplifier 2. Voltages can
A1
IN2+
IN1-
IN1+
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
or V . Unused current-
DD IO
External-Sense Resistor Load-Side Connection for Current-Sense Amplifier 1. Voltages can
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
A2
A3
A4
B1
B2
or V . Unused current-
DD IO
External-Sense Resistor Power-Side Connection for Current-Sense Amplifier 1. Voltages can
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
or V . Unused current-
IO
DD
Supply Voltage for Current-Sense Amplifiers. +2.7V to +3.6V supply. This pin should be
decoupled to GND with a 100nF ceramic capacitor. Power can be applied to V either before
V
DD
DD
or after or in the absence of V
.
IO
External-Sense Resistor Load-Side Connection for Current-Sense Amplifier 2. Voltages can
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
IN2-
or V . Unused current-
DD IO
Supply Voltage for Digital Interface. +1.6V to +3.6V supply. This pin should be decoupled to
GND with a 100nF ceramic capacitor. Power can be applied to V either before or after or in the
V
IO
IO
absence of V
.
DD
Power-Down Mode Input. When this pin is tied low, the device is completely powered down
including the I C/SMBus interface.
B3
B4
PDN
2
GND
Ground Connection
External-Sense Resistor Load-Side Connection for Current-Sense Amplifier 3. Voltages can
C1
IN3-
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
or V . Unused current-
IO
DD
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Pin Description (continued)
PIN
NAME
FUNCTION
2
I C/SMBus-Compatible Address Select Input. A resistor tied to GND from this pin selects the
C2
ADDR
SMBus slave address. See the Addressing section for more details.
Slow Accumulate Mode Input. When this pin is tied high, the power accumulation is slowed to
reduce overall device power consumption.
C3
C4
SLOW
SCL
2
I C/SMBus-Compatible Clock Input. SCL does not load the SMBus when either V
not present.
or V is
IO
DD
External-Sense Resistor Power-Side Connection for Current-Sense Amplifier 3. Voltages can
D1
D2
IN3+
IN4-
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
or V . Unused current-
DD IO
External-Sense Resistor Load-Side Connection for Current-Sense Amplifier 4. Voltages can
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
or V . Unused current-
IO
DD
External-Sense Resistor Power-Side Connection for Current-Sense Amplifier 4. Voltages can
D3
D4
IN4+
SDA
be applied to these pins in the absence of power being applied to V
sense inputs should be tied together and left unconnected.
or V . Unused current-
DD IO
2
I C/SMBus-Compatible Data Input/Output. Output is open drain. SDA does not load the SMBus
when either V
or V is not present.
IO
DD
12-bit ADC, the device takes two current samples; one
with the current sense amplifier in a high-gain mode and
another with the amplifier in a low-gain mode. The high-
gain setting is 16 times the low-gain setting. Based on
the two current-sense ADC results, the device determines
which result provides the best accuracy and fills the 16-bit
current sample accordingly.
Note: For information on how wafer-level packages
(WLPs) are marked, see the Package Top Marking section.
Detailed Description
The MAX34407 automatically sequences through the
channels to collect samples from the common-mode volt-
age and the current-sense amplifiers. The 16-bit current
value and the 12-bit voltage value are then multiplied
to create a 28-bit power value that is then written to the
power accumulator.
SMBus Operation
The MAX34407 uses the SMBus command/response
format as described in the System Management Bus
Specification Version 2.0. The structure of the data flow
between the host and the slave is shown below for several
different types of transactions. Data is sent MSB first. The
fixed slave address of the MAX34407 is determined on
device power-up by sampling the resistor tied to the ADDR
pin. See the Addressing section for details. On device
power-up, the device defaults to the CONTROL command
code (01h). If the host sends an invalid command code,
the device does not acknowledge (NACK) the command
code. If the host attempts to read the device with an invalid
command code, all ones (FFh) are returned in the data
byte.
The MAX34407 contains a 48-bit power accumulator for
each channel. This accumulator is updated 1024 times
per second to allow the device to operate for at least 17
minutes without the host retrieving the results. When the
host is ready to pull the latest accumulation data, it first
sends the UPDATE command that causes the MAX34407
to load the latest accumulation data and accumulation
count into the internal MAX34407 registers so the host
can read them at any time. This type of operation allows
the host to control the accumulation period. The only con-
straint is that the host should access the data before the
accumulators can overflow. If the accumulators overflow,
they do not roll over.
The MAX34407 contains a 12-bit ADC. During each sam-
ple time, a 12-bit voltage sample is resolved and a 16-bit
current sample. To create a 16-bit current value from the
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Table 1. Read Byte Format
1
7
1
1
8
1
1
7
1
1
8
1
1
Slave
Address
Command
Code
Slave
Address
S
W
A
A
SR
R
A
Data Byte
NA
P
Table 2. Write Byte Format
1
7
1
1
8
1
8
1
1
Slave
Address
Command
Code
S
W
A
A
Data Byte
A
P
Table 3. Send Byte Format
1
7
1
1
8
1
1
Slave
Address
Command
Code
S
W
A
A
P
Table 4. Block Read Format
1
7
1
1
8
1
1
7
1
1
8
1
Slave
Address
Command
Code
Slave
Address
S
W
A
A
SR
R
A
Byte Count
A
…
8
1
8
1
1
Data Byte
1 (MSB)
Data Byte
N (LSB)
A
NA
P
…
…
Key:
S = Start
SR = Repeated Start
P = Stop
W = Write Bit (0)
R = Read Bit (1)
A = Acknowledge (0)
NA = Not Acknowledge (1)
Shaded Block = Slave Transaction
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
up by sampling the resistor tied to the ADDR pin when V
DD
Addressing
rises to a valid range. See Table 5 for more details. The
device does not respond to a general call address, only
when it receives its fixed slave address.
The MAX34407 responds to receiving its fixed slave
address by asserting an ACK on the bus. The fixed slave
address of the MAX34407 is determined on device power-
Table 5. SMBus Slave Address Select
RADDR (±1%) (kΩ)
SLAVE ADDRESS
0011 110 (3Ch)
0011 100 (38h)
0011 010 (34h)
0011 000 (30h)
RADDR (±1%) (Ω)
SLAVE ADDRESS
0010 110 (2Ch)
0010 100 (28h)
0010 010 (24h)
0010 000 (20h)
20.5
11.0
5.90
3.16
1.74k
931
442
Tie to GND
Table 6. Command Codes
COMMAND
NAME
NUMBER
OF BYTES
POR
(Note 5)
DETAILED DESCRIPTION
TYPE
CODE
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Fh
UPDATE
CONTROL
Request Accumulator Update
Device Configuration and Status
Accumulator Counter
Send Byte
R/W Byte
0
1
3
6
6
6
6
2
2
2
2
1
—
00h
ACC_COUNT
PWR_ACC_1
PWR_ACC_2
PWR_ACC_3
PWR_ACC_4
VOLTAGE_1
VOLTAGE_2
VOLTAGE_3
VOLTAGE_4
DID
Block Read
Block Read
Block Read
Block Read
Block Read
Block Read
Block Read
Block Read
Block Read
Read Byte
Note 6
Note 6
Note 6
Note 6
Note 6
Note 6
Note 6
Note 6
Note 6
Note 7
Power Accumulator for Channel 1
Power Accumulator for Channel 2
Power Accumulator for Channel 3
Power Accumulator for Channel 4
Voltage for Channel 1
Voltage for Channel 2
Voltage for Channel 3
Voltage for Channel 4
Device ID and Revision
Note 5: The acronym POR means power-on reset. This is the default value when power is applied to the device.
Note 6: These registers are set to all zeros upon POR.
Note 7: The device ID is factory set and varies based on the die revision.
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
at least 500µs before reading any command. Each time
the device receives this command, it transfers the all of
the data in the power accumulators and the accumulator
counter to a set of registers that can be read with the
SMBus interface, and it resets all of the counters. See
Figure 1 for more details.
Update (00h)—Send Byte
The UPDATE send byte command does not contain any
data. The UPDATE command must be sent to the device
before reading any of the other commands, and it must
be sent after writing to the CONTROL command. After
sending the UPDATE command, the host should wait
UPDATE
COMMAND TRANSFERS AND
RESETS ALL ACCUMULATORS
SMBus COMMANDS
UPDATE(00h)
INTERNAL REAL-TIME COUNTERS
ACCUMULATOR COUNTER (24 BITS)
ACC_COUNT(02h)
PWR_ACC_1(03h)
PWR_ACC_2(04h)
PWR_ACC_3(05h)
PWR_ACC_4(05h)
POWER ACCUMULATOR FOR CHANNEL 1 (48 BITS)
POWER ACCUMULATOR FOR CHANNEL 2 (48 BITS)
POWER ACCUMULATOR FOR CHANNEL 3 (48 BITS)
POWER ACCUMULATOR FOR CHANNEL 4 (48 BITS)
OVERFLOW ON ANY
ACCUMULATOR
SETS THE OVF BIT
OR
CONTROL(01h)
Figure 1. MAX34407 Register Structure
Table 7. Control (01h)—R/W Byte
BIT 7
BIT 6
BIT 5
SMM
0
BIT 4
BIT 3
PARK1
0
BIT 2
PARK0
0
BIT 1
BIT 0
OVF
0
NAME:
POR:
0
0
0
0
PARK_EN
0
SLOW
0
Note: Bit positions 6 and 7 must be written to 0 for proper device operation.
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Bit 5: SMM (Single Measure Mode)
When this bit is set, the device performs only one measure and accumulation cycle for the four input channels (normal
scan mode) or four samples of one channel in channel park mode in response to an UPDATE command. The data can
be read by issuing another UPDATE command that moves the previous UPDATE data into the SMBus read registers and
starts another measurement cycle. Data should be read between UPDATE commands. UPDATE commands should be
no less than 500µs apart for reliable measurements. The power accumulators remain at 48 bits even though the single
calculated power is a 28-bit value. After the SMM bit is changed, the UPDATE command should be sent to reset the
accumulators and perform the selected scan operation.
0 = Single-measure mode is disabled.
1 = Single-measure mode is enabled.
Bit 4: PARK_EN
This bit enables the channel park feature. If this bit is set, only one channel is enabled, and the device samples the
selected channel four times faster than the normal round robin rate. The channel to monitor is selected with the PARK0
and PARK1 bits. After the PARK_EN bit is changed, the UPDATE command should be sent to clear out the accumulators
and start a new accumulation period. When the channel park feature is enabled, the minimum time before the power
accumulators can overflow reduces by a factor of four since the selected channel is being updated four times faster. Also,
the power accumulators for the disabled channels do not contain any meaningful data.
0 = Round-robin sampling of all four channels.
1 = One channel is selected (with the PARK0/1 bits).
Bits 3 to 2: PARK1 to PARK0
If the PARK_EN (Park Enable) bit is set, then these bits select which channel is to be monitored at the exclusion of the
other channels.
PARK1
PARK0
SELECTED CHANNEL
Channel 1
0
0
1
1
0
1
0
1
Channel 2
Channel 3
Channel 4
Bit 1: SLOW
This bit is logically OR’ed with the SLOW input pin. If either this bit is set or the SLOW pin is high, then the power accu-
mulation calculation rate is slowed in order to lower the power consumption of the device.
Bit 0: OVF
This status bit is set to a one if any of the power accumulators or the accumulator counter overflows. When the accumulators
or counter overflow, they do not roll over. This status bit can be cleared by writing a 0. If any of the power accumulators or the
accumulator counter are still full, then this bit immediately sets again. Accumulators and the counter that have overflowed
can be cleared by sending the UPDATE command.
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Table 8. Accumulator Counter (02h)—Block Read
BIT 23
CNT23
0
BIT 22
CNT22
0
BIT 21
CNT21
0
BIT 20
CNT20
0
BIT 19
CNT19
0
BIT 18
CNT18
0
BIT 17
CNT17
0
BIT 16
CNT16
0
NAME:
POR:
BIT 15
CNT15
0
BIT 14
CNT14
0
BIT 13
CNT13
0
BIT 12
CNT12
0
BIT 11
CNT11
0
BIT 10
CNT10
0
BIT 9
CNT9
0
BIT 8
CNT8
0
NAME:
POR:
BIT 7
CNT7
0
BIT 6
CNT6
0
BIT 5
CNT5
0
BIT 4
CNT4
0
BIT 3
CNT3
0
BIT 2
CNT2
0
BIT 1
CNT1
0
BIT 0
CNT0
0
NAME:
POR:
Bits 23 to 0: CNT23 to CNT0
These bits report the number of times the accumulators have been updated. Send the UPDATE command before read-
ing this register. By dividing the total accumulated power reported in each power accumulator by this count, the average
power can be determined. The accumulator counter does not roll over. If the accumulator counter overflows, the OVF bit
in the CONTROL command is set and remains set until the UPDATE command is sent.
Table 9. Power Accumulator for Channel 1 (03h)—Block Read
Power Accumulator for Channel 2 (04h)—Block Read
Power Accumulator for Channel 3 (05h)—Block Read
Power Accumulator for Channel 4 (06h)—Block Read
BIT 47
ACC47
0
BIT 46
ACC46
0
BIT 45
ACC45
0
BIT 44
ACC44
0
BIT 43
ACC43
0
BIT 42
ACC42
0
BIT 41
ACC41
0
BIT 40
ACC40
0
NAME:
POR:
BIT 39
ACC39
0
BIT 38
ACC38
0
BIT 37
ACC37
0
BIT 36
ACC36
0
BIT 35
ACC35
0
BIT 34
ACC34
0
BIT 33
ACC33
0
BIT 32
ACC32
0
NAME:
POR:
BIT 31
ACC31
0
BIT 30
ACC30
0
BIT 29
ACC29
0
BIT 28
ACC28
0
BIT 27
ACC27
0
BIT 26
ACC26
0
BIT 25
ACC25
0
BIT 24
ACC24
0
NAME:
POR:
BIT 23
ACC23
0
BIT 22
ACC22
0
BIT 21
ACC21
0
BIT 20
ACC20
0
BIT 19
ACC19
0
BIT 18
ACC18
0
BIT 17
ACC17
0
BIT 16
ACC16
0
NAME:
POR:
BIT 15
ACC15
0
BIT 14
ACC14
0
BIT 13
ACC13
0
BIT 12
ACC12
0
BIT 11
ACC11
0
BIT 10
ACC10
0
BIT 9
ACC9
0
BIT 8
ACC8
0
NAME:
POR:
BIT 7
ACC7
0
BIT 6
ACC6
0
BIT 5
ACC5
0
BIT 4
ACC4
0
BIT 3
ACC3
0
BIT 2
ACC2
0
BIT 1
ACC1
0
BIT 0
ACC0
0
NAME:
POR:
Maxim Integrated
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Bits 47 to 0: ACC47 to ACC0
These bits report the total power accumulated by each channel. Send the UPDATE command before reading these reg-
isters. The power accumulators do not roll over. If any of the power accumulator overflows, the OVF bit in the CONTROL
command is set and remains set until the UPDATE command is sent.
Table 10. Voltage for Channel 1 (07h)—Block Read
Voltage for Channel 2 (08h)—Block Read
Voltage for Channel 3 (09h)—Block Read
Voltage for Channel 4 (0Ah)—Block Read
BIT 15
V11
0
BIT 14
V10
0
BIT 13
V9
BIT 12
V8
BIT 11
V7
BIT 10
V6
BIT 9
V5
BIT 8
V4
NAME:
POR:
0
0
0
0
0
0
BIT 7
V3
BIT 6
V2
BIT 5
V1
BIT 4
V0
BIT 3
N/A
0
BIT 2
N/A
0
BIT 1
N/A
0
BIT 0
N/A
0
NAME:
POR:
0
0
0
0
Note: Bit positions marked as N/A are not assigned and have no meaning. These bits can be either 0 or 1 when read.
Bits 15 to 4: V11 to V0
These bits report the last measured common-mode voltage for each channel. The LSB bit weighting is 3.9mV (16V full
scale/4096). The UPDATE command must be sent before reading the channel voltages. The host should wait 500µs after
sending the UPDATE command before reading the VOLTAGE commands.
Table 11. Device ID & Revision Register (0Fh)—Read Byte
BIT 7
ID4
0
BIT 6
ID3
0
BIT 5
ID2
1
BIT 4
ID1
0
BIT 3
ID0
1
BIT 2
BIT 1
REV1
BIT 0
REV2
REV0
NAME:
POR:
Factory set
Bits 7 to 3: ID4 to ID0
These bits report the device identification (ID). The ID is fixed at 05h.
Bits 2 to 0: REV2 to REV0
These bits report the device revision. The device revision is factory set.
Applications Information
Average Power Calculation Example
The average power can be derived in an external calculation as shown below if the current-sense resistor value is known:
Power accumulator (48 bit) = 0001CEFBD314h (7767577364 decimal)
Accumulator counter (24 bit) = 0005DEh (1502 decimal)
Current-sense resistor = 10mΩ
Step 1
Calculate the unscaled average power by dividing the power accumulator value with the accumulator count value:
0001CEFBD314h/0005DEh = 4EE921h (5171489 decimal)
Step 2
Calculate the ratio of the Step 1 result to the calculated power full-scale value which is a 28-bit value:
28
5171489/2 = 0.019265
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Step 3
Multiply the result from Step 2 by the correction factor listed in Table 12 that matches the current-sense resistor value:
0.019265 x 160 = 3.08W
Table 12. Correction Factors for Various Current-Sense Resistor Values
CURRENT-SENSE
RESISTOR VALUE
(mΩ)
FULL-SCALE
CURRENT
(A)
FULL-SCALE
VOLTAGE
(V)
POWER SCALE
CORRECTION
CALCULATION
POWER SCALE
CORRECTION FACTOR
(W)
100
50
40
25
20
15
10
5
1
2
16
16
16
16
16
16
16
16
16
16
16
1 x 16
2 x 16
16
32
2.5
4
2.5 x 16
4 x 16
40
64
5
5 x 16
80
6.667
10
20
25
50
100
6.667 x 16
10 x 16
20 x 16
25 x 16
50 x 16
100 x 16
106.667
160
320
400
800
1600
4
2
1
Kelvin Sense
For best performance, a Kelvin sense arrangement is recommended. See Figure 2. In a Kelvin sense arrangement,
the voltage sensing nodes across the sense element are placed so that they measure the true voltage drop across
the sense element and not any additional excess voltage drop that can occur in the copper PCB traces or the solder
mounting of the sense element. Routing the differential sense lines along the same path to the MAX34407 and keeping
the path short also improve the system performance.
Minimizing Trace Resistance
PCB trace resistance from the sense resistor (R
) to the IN+ inputs can affect the MAX34407 power-measurement
SENSE
accuracy. Every 1 ohm of PCB trace resistance will add about 25µV of error. It is recommended to place the sense resistors
as close as possible to the MAX34407 and not to use minimum width PCB traces.
CURRENT PATH
KELVIN CONNECTIONS
COPPER
TRACE
COPPER
TRACE
SENSE RESISTOR OUTLINE
ROUTE SENSE LINES ALONG
THE SAME PATH
IN+ IN-
Figure 2. Kelvin Sense Connection Layout Example
Maxim Integrated
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Package Top Marking
TOP SIDE
+
3
Y
#
4 4 0 7
Y
#
W W $
@ @
$
#
O = If shown above, designates the location of Pin One/Ball A1 laser mark or mold tool mark.
+ = If shown above, indicates the part is Pb-free and designates location of Pin One/Ball A1 Pb-free laser mark.
# = If shown above, indicates the part is RoHS compliant and designates location of Pin One/Ball A1 RoHS laser mark.
$$ = Will be substituted with the product revision code from the reliability database
### = Will be substituted with the last 3 numeric characters from the lot number
@@ = Will be substituted with the first two alpha characters after the numeric characters from the lot number
*
= Will be substituted with the factory code - second letter from the left of the lot number
1. Date Code
: yy = Last two digits of year of assembly
ww = Week of assembly
2. Plus sign(+), located near pin one(or ball pad A1), indicates that this part is Pb free.
Ordering Information
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PART
TEMP RANGE
PIN-PACKAGE
16 WLP
MAX34407EWE+
MAX34407EWE+T
-40°C to +85°C
-40°C to +85°C
16 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PACKAGE PACKAGE OUTLINE
LAND
TYPE
CODE
NO.
PATTERN NO.
Refer to Application
Note 1891
16 WLP
W16N2+1
21-0893
Maxim Integrated
│ 16
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MAX34407
SMBus 4-Channel Wide Dynamic Range
Power Accumulator
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
11/14
7/17
0
1
Initial release
—
Added Package Top Marking section
16
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2017 Maxim Integrated Products, Inc.
│ 17
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